git-gui: Always start a rescan on an empty diff.

[git/gitweb.git] / git-gui.sh

#!/bin/sh
# Tcl ignores the next line -*- tcl -*- \
exec wish "$0" -- "$@"

set appvers {@@GIT_VERSION@@}
set copyright {
Copyright © 2006, 2007 Shawn Pearce, Paul Mackerras.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA}

######################################################################
##
## read only globals

set _appname [lindex [file split $argv0] end]
set _gitdir {}
set _reponame {}

proc appname {} {
        global _appname
        return $_appname
}

proc gitdir {args} {
        global _gitdir
        if {$args eq {}} {
                return $_gitdir
        }
        return [eval [concat [list file join $_gitdir] $args]]
}

proc reponame {} {
        global _reponame
        return $_reponame
}

######################################################################
##
## config

proc is_many_config {name} {
        switch -glob -- $name {
        remote.*.fetch -
        remote.*.push
                {return 1}
        *
                {return 0}
        }
}

proc load_config {include_global} {
        global repo_config global_config default_config

        array unset global_config
        if {$include_global} {
                catch {
                        set fd_rc [open "| git repo-config --global --list" r]
                        while {[gets $fd_rc line] >= 0} {
                                if {[regexp {^([^=]+)=(.*)$} $line line name value]} {
                                        if {[is_many_config $name]} {
                                                lappend global_config($name) $value
                                        } else {
                                                set global_config($name) $value
                                        }
                                }
                        }
                        close $fd_rc
                }
        }

        array unset repo_config
        catch {
                set fd_rc [open "| git repo-config --list" r]
                while {[gets $fd_rc line] >= 0} {
                        if {[regexp {^([^=]+)=(.*)$} $line line name value]} {
                                if {[is_many_config $name]} {
                                        lappend repo_config($name) $value
                                } else {
                                        set repo_config($name) $value
                                }
                        }
                }
                close $fd_rc
        }

        foreach name [array names default_config] {
                if {[catch {set v $global_config($name)}]} {
                        set global_config($name) $default_config($name)
                }
                if {[catch {set v $repo_config($name)}]} {
                        set repo_config($name) $default_config($name)
                }
        }
}

proc save_config {} {
        global default_config font_descs
        global repo_config global_config
        global repo_config_new global_config_new

        foreach option $font_descs {
                set name [lindex $option 0]
                set font [lindex $option 1]
                font configure $font \
                        -family $global_config_new(gui.$font^^family) \
                        -size $global_config_new(gui.$font^^size)
                font configure ${font}bold \
                        -family $global_config_new(gui.$font^^family) \
                        -size $global_config_new(gui.$font^^size)
                set global_config_new(gui.$name) [font configure $font]
                unset global_config_new(gui.$font^^family)
                unset global_config_new(gui.$font^^size)
        }

        foreach name [array names default_config] {
                set value $global_config_new($name)
                if {$value ne $global_config($name)} {
                        if {$value eq $default_config($name)} {
                                catch {exec git repo-config --global --unset $name}
                        } else {
                                regsub -all "\[{}\]" $value {"} value
                                exec git repo-config --global $name $value
                        }
                        set global_config($name) $value
                        if {$value eq $repo_config($name)} {
                                catch {exec git repo-config --unset $name}
                                set repo_config($name) $value
                        }
                }
        }

        foreach name [array names default_config] {
                set value $repo_config_new($name)
                if {$value ne $repo_config($name)} {
                        if {$value eq $global_config($name)} {
                                catch {exec git repo-config --unset $name}
                        } else {
                                regsub -all "\[{}\]" $value {"} value
                                exec git repo-config $name $value
                        }
                        set repo_config($name) $value
                }
        }
}

proc error_popup {msg} {
        set title [appname]
        if {[reponame] ne {}} {
                append title " ([reponame])"
        }
        set cmd [list tk_messageBox \
                -icon error \
                -type ok \
                -title "$title: error" \
                -message $msg]
        if {[winfo ismapped .]} {
                lappend cmd -parent .
        }
        eval $cmd
}

proc warn_popup {msg} {
        set title [appname]
        if {[reponame] ne {}} {
                append title " ([reponame])"
        }
        set cmd [list tk_messageBox \
                -icon warning \
                -type ok \
                -title "$title: warning" \
                -message $msg]
        if {[winfo ismapped .]} {
                lappend cmd -parent .
        }
        eval $cmd
}

proc info_popup {msg} {
        set title [appname]
        if {[reponame] ne {}} {
                append title " ([reponame])"
        }
        tk_messageBox \
                -parent . \
                -icon info \
                -type ok \
                -title $title \
                -message $msg
}

proc ask_popup {msg} {
        set title [appname]
        if {[reponame] ne {}} {
                append title " ([reponame])"
        }
        return [tk_messageBox \
                -parent . \
                -icon question \
                -type yesno \
                -title $title \
                -message $msg]
}

######################################################################
##
## repository setup

if {   [catch {set _gitdir $env(GIT_DIR)}]
        && [catch {set _gitdir [exec git rev-parse --git-dir]} err]} {
        catch {wm withdraw .}
        error_popup "Cannot find the git directory:\n\n$err"
        exit 1
}
if {![file isdirectory $_gitdir]} {
        catch {wm withdraw .}
        error_popup "Git directory not found:\n\n$_gitdir"
        exit 1
}
if {[lindex [file split $_gitdir] end] ne {.git}} {
        catch {wm withdraw .}
        error_popup "Cannot use funny .git directory:\n\n$gitdir"
        exit 1
}
if {[catch {cd [file dirname $_gitdir]} err]} {
        catch {wm withdraw .}
        error_popup "No working directory [file dirname $_gitdir]:\n\n$err"
        exit 1
}
set _reponame [lindex [file split \
        [file normalize [file dirname $_gitdir]]] \
        end]

set single_commit 0
if {[appname] eq {git-citool}} {
        set single_commit 1
}

######################################################################
##
## task management

set rescan_active 0
set diff_active 0
set last_clicked {}

set disable_on_lock [list]
set index_lock_type none

proc lock_index {type} {
        global index_lock_type disable_on_lock

        if {$index_lock_type eq {none}} {
                set index_lock_type $type
                foreach w $disable_on_lock {
                        uplevel #0 $w disabled
                }
                return 1
        } elseif {$index_lock_type eq "begin-$type"} {
                set index_lock_type $type
                return 1
        }
        return 0
}

proc unlock_index {} {
        global index_lock_type disable_on_lock

        set index_lock_type none
        foreach w $disable_on_lock {
                uplevel #0 $w normal
        }
}

######################################################################
##
## status

proc repository_state {ctvar hdvar mhvar} {
        global current_branch
        upvar $ctvar ct $hdvar hd $mhvar mh

        set mh [list]

        if {[catch {set current_branch [exec git symbolic-ref HEAD]}]} {
                set current_branch {}
        } else {
                regsub ^refs/((heads|tags|remotes)/)? \
                        $current_branch \
                        {} \
                        current_branch
        }

        if {[catch {set hd [exec git rev-parse --verify HEAD]}]} {
                set hd {}
                set ct initial
                return
        }

        set merge_head [gitdir MERGE_HEAD]
        if {[file exists $merge_head]} {
                set ct merge
                set fd_mh [open $merge_head r]
                while {[gets $fd_mh line] >= 0} {
                        lappend mh $line
                }
                close $fd_mh
                return
        }

        set ct normal
}

proc PARENT {} {
        global PARENT empty_tree

        set p [lindex $PARENT 0]
        if {$p ne {}} {
                return $p
        }
        if {$empty_tree eq {}} {
                set empty_tree [exec git mktree << {}]
        }
        return $empty_tree
}

proc rescan {after {honor_trustmtime 1}} {
        global HEAD PARENT MERGE_HEAD commit_type
        global ui_index ui_workdir ui_status_value ui_comm
        global rescan_active file_states
        global repo_config

        if {$rescan_active > 0 || ![lock_index read]} return

        repository_state newType newHEAD newMERGE_HEAD
        if {[string match amend* $commit_type]
                && $newType eq {normal}
                && $newHEAD eq $HEAD} {
        } else {
                set HEAD $newHEAD
                set PARENT $newHEAD
                set MERGE_HEAD $newMERGE_HEAD
                set commit_type $newType
        }

        array unset file_states

        if {![$ui_comm edit modified]
                || [string trim [$ui_comm get 0.0 end]] eq {}} {
                if {[load_message GITGUI_MSG]} {
                } elseif {[load_message MERGE_MSG]} {
                } elseif {[load_message SQUASH_MSG]} {
                }
                $ui_comm edit reset
                $ui_comm edit modified false
        }

        if {$honor_trustmtime && $repo_config(gui.trustmtime) eq {true}} {
                rescan_stage2 {} $after
        } else {
                set rescan_active 1
                set ui_status_value {Refreshing file status...}
                set cmd [list git update-index]
                lappend cmd -q
                lappend cmd --unmerged
                lappend cmd --ignore-missing
                lappend cmd --refresh
                set fd_rf [open "| $cmd" r]
                fconfigure $fd_rf -blocking 0 -translation binary
                fileevent $fd_rf readable \
                        [list rescan_stage2 $fd_rf $after]
        }
}

proc rescan_stage2 {fd after} {
        global ui_status_value
        global rescan_active buf_rdi buf_rdf buf_rlo

        if {$fd ne {}} {
                read $fd
                if {![eof $fd]} return
                close $fd
        }

        set ls_others [list | git ls-files --others -z \
                --exclude-per-directory=.gitignore]
        set info_exclude [gitdir info exclude]
        if {[file readable $info_exclude]} {
                lappend ls_others "--exclude-from=$info_exclude"
        }

        set buf_rdi {}
        set buf_rdf {}
        set buf_rlo {}

        set rescan_active 3
        set ui_status_value {Scanning for modified files ...}
        set fd_di [open "| git diff-index --cached -z [PARENT]" r]
        set fd_df [open "| git diff-files -z" r]
        set fd_lo [open $ls_others r]

        fconfigure $fd_di -blocking 0 -translation binary
        fconfigure $fd_df -blocking 0 -translation binary
        fconfigure $fd_lo -blocking 0 -translation binary
        fileevent $fd_di readable [list read_diff_index $fd_di $after]
        fileevent $fd_df readable [list read_diff_files $fd_df $after]
        fileevent $fd_lo readable [list read_ls_others $fd_lo $after]
}

proc load_message {file} {
        global ui_comm

        set f [gitdir $file]
        if {[file isfile $f]} {
                if {[catch {set fd [open $f r]}]} {
                        return 0
                }
                set content [string trim [read $fd]]
                close $fd
                $ui_comm delete 0.0 end
                $ui_comm insert end $content
                return 1
        }
        return 0
}

proc read_diff_index {fd after} {
        global buf_rdi

        append buf_rdi [read $fd]
        set c 0
        set n [string length $buf_rdi]
        while {$c < $n} {
                set z1 [string first "\0" $buf_rdi $c]
                if {$z1 == -1} break
                incr z1
                set z2 [string first "\0" $buf_rdi $z1]
                if {$z2 == -1} break

                incr c
                set i [split [string range $buf_rdi $c [expr {$z1 - 2}]] { }]
                merge_state \
                        [string range $buf_rdi $z1 [expr {$z2 - 1}]] \
                        [lindex $i 4]? \
                        [list [lindex $i 0] [lindex $i 2]] \
                        [list]
                set c $z2
                incr c
        }
        if {$c < $n} {
                set buf_rdi [string range $buf_rdi $c end]
        } else {
                set buf_rdi {}
        }

        rescan_done $fd buf_rdi $after
}

proc read_diff_files {fd after} {
        global buf_rdf

        append buf_rdf [read $fd]
        set c 0
        set n [string length $buf_rdf]
        while {$c < $n} {
                set z1 [string first "\0" $buf_rdf $c]
                if {$z1 == -1} break
                incr z1
                set z2 [string first "\0" $buf_rdf $z1]
                if {$z2 == -1} break

                incr c
                set i [split [string range $buf_rdf $c [expr {$z1 - 2}]] { }]
                merge_state \
                        [string range $buf_rdf $z1 [expr {$z2 - 1}]] \
                        ?[lindex $i 4] \
                        [list] \
                        [list [lindex $i 0] [lindex $i 2]]
                set c $z2
                incr c
        }
        if {$c < $n} {
                set buf_rdf [string range $buf_rdf $c end]
        } else {
                set buf_rdf {}
        }

        rescan_done $fd buf_rdf $after
}

proc read_ls_others {fd after} {
        global buf_rlo

        append buf_rlo [read $fd]
        set pck [split $buf_rlo "\0"]
        set buf_rlo [lindex $pck end]
        foreach p [lrange $pck 0 end-1] {
                merge_state $p ?O
        }
        rescan_done $fd buf_rlo $after
}

proc rescan_done {fd buf after} {
        global rescan_active
        global file_states repo_config
        upvar $buf to_clear

        if {![eof $fd]} return
        set to_clear {}
        close $fd
        if {[incr rescan_active -1] > 0} return

        prune_selection
        unlock_index
        display_all_files
        reshow_diff
        uplevel #0 $after
}

proc prune_selection {} {
        global file_states selected_paths

        foreach path [array names selected_paths] {
                if {[catch {set still_here $file_states($path)}]} {
                        unset selected_paths($path)
                }
        }
}

######################################################################
##
## diff

proc clear_diff {} {
        global ui_diff current_diff_path ui_index ui_workdir

        $ui_diff conf -state normal
        $ui_diff delete 0.0 end
        $ui_diff conf -state disabled

        set current_diff_path {}

        $ui_index tag remove in_diff 0.0 end
        $ui_workdir tag remove in_diff 0.0 end
}

proc reshow_diff {} {
        global ui_status_value file_states file_lists
        global current_diff_path current_diff_side

        set p $current_diff_path
        if {$p eq {}
                || $current_diff_side eq {}
                || [catch {set s $file_states($p)}]
                || [lsearch -sorted $file_lists($current_diff_side) $p] == -1} {
                clear_diff
        } else {
                show_diff $p $current_diff_side
        }
}

proc handle_empty_diff {} {
        global current_diff_path file_states file_lists

        set path $current_diff_path
        set s $file_states($path)
        if {[lindex $s 0] ne {_M}} return

        info_popup "No differences detected.

[short_path $path] has no changes.

The modification date of this file was updated
by another application, but the content within
the file was not changed.

A rescan will be automatically started to find
other files which may have the same state."

        clear_diff
        display_file $path __
        rescan {set ui_status_value {Ready.}} 0
}

proc show_diff {path w {lno {}}} {
        global file_states file_lists
        global is_3way_diff diff_active repo_config
        global ui_diff ui_status_value ui_index ui_workdir
        global current_diff_path current_diff_side

        if {$diff_active || ![lock_index read]} return

        clear_diff
        if {$w eq {} || $lno == {}} {
                foreach w [array names file_lists] {
                        set lno [lsearch -sorted $file_lists($w) $path]
                        if {$lno >= 0} {
                                incr lno
                                break
                        }
                }
        }
        if {$w ne {} && $lno >= 1} {
                $w tag add in_diff $lno.0 [expr {$lno + 1}].0
        }

        set s $file_states($path)
        set m [lindex $s 0]
        set is_3way_diff 0
        set diff_active 1
        set current_diff_path $path
        set current_diff_side $w
        set ui_status_value "Loading diff of [escape_path $path]..."

        # - Git won't give us the diff, there's nothing to compare to!
        #
        if {$m eq {_O}} {
                if {[catch {
                                set fd [open $path r]
                                set content [read $fd]
                                close $fd
                        } err ]} {
                        set diff_active 0
                        unlock_index
                        set ui_status_value "Unable to display [escape_path $path]"
                        error_popup "Error loading file:\n\n$err"
                        return
                }
                $ui_diff conf -state normal
                $ui_diff insert end $content
                $ui_diff conf -state disabled
                set diff_active 0
                unlock_index
                set ui_status_value {Ready.}
                return
        }

        set cmd [list | git]
        if {$w eq $ui_index} {
                lappend cmd diff-index
                lappend cmd --cached
        } elseif {$w eq $ui_workdir} {
                if {[string index $m 0] eq {U}} {
                        lappend cmd diff
                } else {
                        lappend cmd diff-files
                }
        }

        lappend cmd -p
        lappend cmd --no-color
        if {$repo_config(gui.diffcontext) > 0} {
                lappend cmd "-U$repo_config(gui.diffcontext)"
        }
        if {$w eq $ui_index} {
                lappend cmd [PARENT]
        }
        lappend cmd --
        lappend cmd $path

        if {[catch {set fd [open $cmd r]} err]} {
                set diff_active 0
                unlock_index
                set ui_status_value "Unable to display [escape_path $path]"
                error_popup "Error loading diff:\n\n$err"
                return
        }

        fconfigure $fd -blocking 0 -translation auto
        fileevent $fd readable [list read_diff $fd]
}

proc read_diff {fd} {
        global ui_diff ui_status_value is_3way_diff diff_active

        $ui_diff conf -state normal
        while {[gets $fd line] >= 0} {
                # -- Cleanup uninteresting diff header lines.
                #
                if {[string match {diff --git *}      $line]} continue
                if {[string match {diff --cc *}       $line]} continue
                if {[string match {diff --combined *} $line]} continue
                if {[string match {--- *}             $line]} continue
                if {[string match {+++ *}             $line]} continue
                if {$line eq {deleted file mode 120000}} {
                        set line "deleted symlink"
                }

                # -- Automatically detect if this is a 3 way diff.
                #
                if {[string match {@@@ *} $line]} {set is_3way_diff 1}

                if {[string match {index *} $line]
                        || [string match {mode *} $line]
                        || [string match {new file *} $line]
                        || [string match {deleted file *} $line]
                        || $line eq {\ No newline at end of file}
                        || [regexp {^\* Unmerged path } $line]} {
                        set tags {}
                } elseif {$is_3way_diff} {
                        set op [string range $line 0 1]
                        switch -- $op {
                        {  } {set tags {}}
                        {@@} {set tags d_@}
                        { +} {set tags d_s+}
                        { -} {set tags d_s-}
                        {+ } {set tags d_+s}
                        {- } {set tags d_-s}
                        {--} {set tags d_--}
                        {++} {
                                if {[regexp {^\+\+([<>]{7} |={7})} $line _g op]} {
                                        set line [string replace $line 0 1 {  }]
                                        set tags d$op
                                } else {
                                        set tags d_++
                                }
                        }
                        default {
                                puts "error: Unhandled 3 way diff marker: {$op}"
                                set tags {}
                        }
                        }
                } else {
                        set op [string index $line 0]
                        switch -- $op {
                        { } {set tags {}}
                        {@} {set tags d_@}
                        {-} {set tags d_-}
                        {+} {
                                if {[regexp {^\+([<>]{7} |={7})} $line _g op]} {
                                        set line [string replace $line 0 0 { }]
                                        set tags d$op
                                } else {
                                        set tags d_+
                                }
                        }
                        default {
                                puts "error: Unhandled 2 way diff marker: {$op}"
                                set tags {}
                        }
                        }
                }
                $ui_diff insert end $line $tags
                $ui_diff insert end "\n" $tags
        }
        $ui_diff conf -state disabled

        if {[eof $fd]} {
                close $fd
                set diff_active 0
                unlock_index
                set ui_status_value {Ready.}

                if {[$ui_diff index end] eq {2.0}} {
                        handle_empty_diff
                }
        }
}

######################################################################
##
## commit

proc load_last_commit {} {
        global HEAD PARENT MERGE_HEAD commit_type ui_comm

        if {[llength $PARENT] == 0} {
                error_popup {There is nothing to amend.

You are about to create the initial commit.
There is no commit before this to amend.
}
                return
        }

        repository_state curType curHEAD curMERGE_HEAD
        if {$curType eq {merge}} {
                error_popup {Cannot amend while merging.

You are currently in the middle of a merge that
has not been fully completed.  You cannot amend
the prior commit unless you first abort the
current merge activity.
}
                return
        }

        set msg {}
        set parents [list]
        if {[catch {
                        set fd [open "| git cat-file commit $curHEAD" r]
                        while {[gets $fd line] > 0} {
                                if {[string match {parent *} $line]} {
                                        lappend parents [string range $line 7 end]
                                }
                        }
                        set msg [string trim [read $fd]]
                        close $fd
                } err]} {
                error_popup "Error loading commit data for amend:\n\n$err"
                return
        }

        set HEAD $curHEAD
        set PARENT $parents
        set MERGE_HEAD [list]
        switch -- [llength $parents] {
        0       {set commit_type amend-initial}
        1       {set commit_type amend}
        default {set commit_type amend-merge}
        }

        $ui_comm delete 0.0 end
        $ui_comm insert end $msg
        $ui_comm edit reset
        $ui_comm edit modified false
        rescan {set ui_status_value {Ready.}}
}

proc create_new_commit {} {
        global commit_type ui_comm

        set commit_type normal
        $ui_comm delete 0.0 end
        $ui_comm edit reset
        $ui_comm edit modified false
        rescan {set ui_status_value {Ready.}}
}

set GIT_COMMITTER_IDENT {}

proc committer_ident {} {
        global GIT_COMMITTER_IDENT

        if {$GIT_COMMITTER_IDENT eq {}} {
                if {[catch {set me [exec git var GIT_COMMITTER_IDENT]} err]} {
                        error_popup "Unable to obtain your identity:\n\n$err"
                        return {}
                }
                if {![regexp {^(.*) [0-9]+ [-+0-9]+$} \
                        $me me GIT_COMMITTER_IDENT]} {
                        error_popup "Invalid GIT_COMMITTER_IDENT:\n\n$me"
                        return {}
                }
        }

        return $GIT_COMMITTER_IDENT
}

proc commit_tree {} {
        global HEAD commit_type file_states ui_comm repo_config
        global ui_status_value pch_error

        if {![lock_index update]} return
        if {[committer_ident] eq {}} return

        # -- Our in memory state should match the repository.
        #
        repository_state curType curHEAD curMERGE_HEAD
        if {[string match amend* $commit_type]
                && $curType eq {normal}
                && $curHEAD eq $HEAD} {
        } elseif {$commit_type ne $curType || $HEAD ne $curHEAD} {
                info_popup {Last scanned state does not match repository state.

Another Git program has modified this repository
since the last scan.  A rescan must be performed
before another commit can be created.

The rescan will be automatically started now.
}
                unlock_index
                rescan {set ui_status_value {Ready.}}
                return
        }

        # -- At least one file should differ in the index.
        #
        set files_ready 0
        foreach path [array names file_states] {
                switch -glob -- [lindex $file_states($path) 0] {
                _? {continue}
                A? -
                D? -
                M? {set files_ready 1}
                U? {
                        error_popup "Unmerged files cannot be committed.

File [short_path $path] has merge conflicts.
You must resolve them and add the file before committing.
"
                        unlock_index
                        return
                }
                default {
                        error_popup "Unknown file state [lindex $s 0] detected.

File [short_path $path] cannot be committed by this program.
"
                }
                }
        }
        if {!$files_ready} {
                info_popup {No changes to commit.

You must add at least 1 file before you can commit.
}
                unlock_index
                return
        }

        # -- A message is required.
        #
        set msg [string trim [$ui_comm get 1.0 end]]
        if {$msg eq {}} {
                error_popup {Please supply a commit message.

A good commit message has the following format:

- First line: Describe in one sentance what you did.
- Second line: Blank
- Remaining lines: Describe why this change is good.
}
                unlock_index
                return
        }

        # -- Run the pre-commit hook.
        #
        set pchook [gitdir hooks pre-commit]

        # On Cygwin [file executable] might lie so we need to ask
        # the shell if the hook is executable.  Yes that's annoying.
        #
        if {[is_Windows] && [file isfile $pchook]} {
                set pchook [list sh -c [concat \
                        "if test -x \"$pchook\";" \
                        "then exec \"$pchook\" 2>&1;" \
                        "fi"]]
        } elseif {[file executable $pchook]} {
                set pchook [list $pchook |& cat]
        } else {
                commit_writetree $curHEAD $msg
                return
        }

        set ui_status_value {Calling pre-commit hook...}
        set pch_error {}
        set fd_ph [open "| $pchook" r]
        fconfigure $fd_ph -blocking 0 -translation binary
        fileevent $fd_ph readable \
                [list commit_prehook_wait $fd_ph $curHEAD $msg]
}

proc commit_prehook_wait {fd_ph curHEAD msg} {
        global pch_error ui_status_value

        append pch_error [read $fd_ph]
        fconfigure $fd_ph -blocking 1
        if {[eof $fd_ph]} {
                if {[catch {close $fd_ph}]} {
                        set ui_status_value {Commit declined by pre-commit hook.}
                        hook_failed_popup pre-commit $pch_error
                        unlock_index
                } else {
                        commit_writetree $curHEAD $msg
                }
                set pch_error {}
                return
        }
        fconfigure $fd_ph -blocking 0
}

proc commit_writetree {curHEAD msg} {
        global ui_status_value

        set ui_status_value {Committing changes...}
        set fd_wt [open "| git write-tree" r]
        fileevent $fd_wt readable \
                [list commit_committree $fd_wt $curHEAD $msg]
}

proc commit_committree {fd_wt curHEAD msg} {
        global HEAD PARENT MERGE_HEAD commit_type
        global single_commit all_heads current_branch
        global ui_status_value ui_comm selected_commit_type
        global file_states selected_paths rescan_active

        gets $fd_wt tree_id
        if {$tree_id eq {} || [catch {close $fd_wt} err]} {
                error_popup "write-tree failed:\n\n$err"
                set ui_status_value {Commit failed.}
                unlock_index
                return
        }

        # -- Create the commit.
        #
        set cmd [list git commit-tree $tree_id]
        set parents [concat $PARENT $MERGE_HEAD]
        if {[llength $parents] > 0} {
                foreach p $parents {
                        lappend cmd -p $p
                }
        } else {
                # git commit-tree writes to stderr during initial commit.
                lappend cmd 2>/dev/null
        }
        lappend cmd << $msg
        if {[catch {set cmt_id [eval exec $cmd]} err]} {
                error_popup "commit-tree failed:\n\n$err"
                set ui_status_value {Commit failed.}
                unlock_index
                return
        }

        # -- Update the HEAD ref.
        #
        set reflogm commit
        if {$commit_type ne {normal}} {
                append reflogm " ($commit_type)"
        }
        set i [string first "\n" $msg]
        if {$i >= 0} {
                append reflogm {: } [string range $msg 0 [expr {$i - 1}]]
        } else {
                append reflogm {: } $msg
        }
        set cmd [list git update-ref -m $reflogm HEAD $cmt_id $curHEAD]
        if {[catch {eval exec $cmd} err]} {
                error_popup "update-ref failed:\n\n$err"
                set ui_status_value {Commit failed.}
                unlock_index
                return
        }

        # -- Make sure our current branch exists.
        #
        if {$commit_type eq {initial}} {
                lappend all_heads $current_branch
                set all_heads [lsort -unique $all_heads]
                populate_branch_menu
        }

        # -- Cleanup after ourselves.
        #
        catch {file delete [gitdir MERGE_HEAD]}
        catch {file delete [gitdir MERGE_MSG]}
        catch {file delete [gitdir SQUASH_MSG]}
        catch {file delete [gitdir GITGUI_MSG]}

        # -- Let rerere do its thing.
        #
        if {[file isdirectory [gitdir rr-cache]]} {
                catch {exec git rerere}
        }

        # -- Run the post-commit hook.
        #
        set pchook [gitdir hooks post-commit]
        if {[is_Windows] && [file isfile $pchook]} {
                set pchook [list sh -c [concat \
                        "if test -x \"$pchook\";" \
                        "then exec \"$pchook\";" \
                        "fi"]]
        } elseif {![file executable $pchook]} {
                set pchook {}
        }
        if {$pchook ne {}} {
                catch {exec $pchook &}
        }

        $ui_comm delete 0.0 end
        $ui_comm edit reset
        $ui_comm edit modified false

        if {$single_commit} do_quit

        # -- Update in memory status
        #
        set selected_commit_type new
        set commit_type normal
        set HEAD $cmt_id
        set PARENT $cmt_id
        set MERGE_HEAD [list]

        foreach path [array names file_states] {
                set s $file_states($path)
                set m [lindex $s 0]
                switch -glob -- $m {
                _O -
                _M -
                _D {continue}
                __ -
                A_ -
                M_ -
                D_ {
                        unset file_states($path)
                        catch {unset selected_paths($path)}
                }
                DO {
                        set file_states($path) [list _O [lindex $s 1] {} {}]
                }
                AM -
                AD -
                MM -
                MD {
                        set file_states($path) [list \
                                _[string index $m 1] \
                                [lindex $s 1] \
                                [lindex $s 3] \
                                {}]
                }
                }
        }

        display_all_files
        unlock_index
        reshow_diff
        set ui_status_value \
                "Changes committed as [string range $cmt_id 0 7]."
}

######################################################################
##
## fetch pull push

proc fetch_from {remote} {
        set w [new_console "fetch $remote" \
                "Fetching new changes from $remote"]
        set cmd [list git fetch]
        lappend cmd $remote
        console_exec $w $cmd
}

proc pull_remote {remote branch} {
        global HEAD commit_type file_states repo_config

        if {![lock_index update]} return

        # -- Our in memory state should match the repository.
        #
        repository_state curType curHEAD curMERGE_HEAD
        if {$commit_type ne $curType || $HEAD ne $curHEAD} {
                info_popup {Last scanned state does not match repository state.

Another Git program has modified this repository
since the last scan.  A rescan must be performed
before a pull operation can be started.

The rescan will be automatically started now.
}
                unlock_index
                rescan {set ui_status_value {Ready.}}
                return
        }

        # -- No differences should exist before a pull.
        #
        if {[array size file_states] != 0} {
                error_popup {Uncommitted but modified files are present.

You should not perform a pull with unmodified
files in your working directory as Git will be
unable to recover from an incorrect merge.

You should commit or revert all changes before
starting a pull operation.
}
                unlock_index
                return
        }

        set w [new_console "pull $remote $branch" \
                "Pulling new changes from branch $branch in $remote"]
        set cmd [list git pull]
        if {$repo_config(gui.pullsummary) eq {false}} {
                lappend cmd --no-summary
        }
        lappend cmd $remote
        lappend cmd $branch
        console_exec $w $cmd [list post_pull_remote $remote $branch]
}

proc post_pull_remote {remote branch success} {
        global HEAD PARENT MERGE_HEAD commit_type selected_commit_type
        global ui_status_value

        unlock_index
        if {$success} {
                repository_state commit_type HEAD MERGE_HEAD
                set PARENT $HEAD
                set selected_commit_type new
                set ui_status_value "Pulling $branch from $remote complete."
        } else {
                rescan [list set ui_status_value \
                        "Conflicts detected while pulling $branch from $remote."]
        }
}

proc push_to {remote} {
        set w [new_console "push $remote" \
                "Pushing changes to $remote"]
        set cmd [list git push]
        lappend cmd $remote
        console_exec $w $cmd
}

######################################################################
##
## ui helpers

proc mapicon {w state path} {
        global all_icons

        if {[catch {set r $all_icons($state$w)}]} {
                puts "error: no icon for $w state={$state} $path"
                return file_plain
        }
        return $r
}

proc mapdesc {state path} {
        global all_descs

        if {[catch {set r $all_descs($state)}]} {
                puts "error: no desc for state={$state} $path"
                return $state
        }
        return $r
}

proc escape_path {path} {
        regsub -all "\n" $path "\\n" path
        return $path
}

proc short_path {path} {
        return [escape_path [lindex [file split $path] end]]
}

set next_icon_id 0
set null_sha1 [string repeat 0 40]

proc merge_state {path new_state {head_info {}} {index_info {}}} {
        global file_states next_icon_id null_sha1

        set s0 [string index $new_state 0]
        set s1 [string index $new_state 1]

        if {[catch {set info $file_states($path)}]} {
                set state __
                set icon n[incr next_icon_id]
        } else {
                set state [lindex $info 0]
                set icon [lindex $info 1]
                if {$head_info eq {}}  {set head_info  [lindex $info 2]}
                if {$index_info eq {}} {set index_info [lindex $info 3]}
        }

        if     {$s0 eq {?}} {set s0 [string index $state 0]} \
        elseif {$s0 eq {_}} {set s0 _}

        if     {$s1 eq {?}} {set s1 [string index $state 1]} \
        elseif {$s1 eq {_}} {set s1 _}

        if {$s0 eq {A} && $s1 eq {_} && $head_info eq {}} {
                set head_info [list 0 $null_sha1]
        } elseif {$s0 ne {_} && [string index $state 0] eq {_}
                && $head_info eq {}} {
                set head_info $index_info
        }

        set file_states($path) [list $s0$s1 $icon \
                $head_info $index_info \
                ]
        return $state
}

proc display_file_helper {w path icon_name old_m new_m} {
        global file_lists

        if {$new_m eq {_}} {
                set lno [lsearch -sorted $file_lists($w) $path]
                if {$lno >= 0} {
                        set file_lists($w) [lreplace $file_lists($w) $lno $lno]
                        incr lno
                        $w conf -state normal
                        $w delete $lno.0 [expr {$lno + 1}].0
                        $w conf -state disabled
                }
        } elseif {$old_m eq {_} && $new_m ne {_}} {
                lappend file_lists($w) $path
                set file_lists($w) [lsort -unique $file_lists($w)]
                set lno [lsearch -sorted $file_lists($w) $path]
                incr lno
                $w conf -state normal
                $w image create $lno.0 \
                        -align center -padx 5 -pady 1 \
                        -name $icon_name \
                        -image [mapicon $w $new_m $path]
                $w insert $lno.1 "[escape_path $path]\n"
                $w conf -state disabled
        } elseif {$old_m ne $new_m} {
                $w conf -state normal
                $w image conf $icon_name -image [mapicon $w $new_m $path]
                $w conf -state disabled
        }
}

proc display_file {path state} {
        global file_states selected_paths
        global ui_index ui_workdir

        set old_m [merge_state $path $state]
        set s $file_states($path)
        set new_m [lindex $s 0]
        set icon_name [lindex $s 1]

        set o [string index $old_m 0]
        set n [string index $new_m 0]
        if {$o eq {U}} {
                set o _
        }
        if {$n eq {U}} {
                set n _
        }
        display_file_helper     $ui_index $path $icon_name $o $n

        if {[string index $old_m 0] eq {U}} {
                set o U
        } else {
                set o [string index $old_m 1]
        }
        if {[string index $new_m 0] eq {U}} {
                set n U
        } else {
                set n [string index $new_m 1]
        }
        display_file_helper     $ui_workdir $path $icon_name $o $n

        if {$new_m eq {__}} {
                unset file_states($path)
                catch {unset selected_paths($path)}
        }
}

proc display_all_files_helper {w path icon_name m} {
        global file_lists

        lappend file_lists($w) $path
        set lno [expr {[lindex [split [$w index end] .] 0] - 1}]
        $w image create end \
                -align center -padx 5 -pady 1 \
                -name $icon_name \
                -image [mapicon $w $m $path]
        $w insert end "[escape_path $path]\n"
}

proc display_all_files {} {
        global ui_index ui_workdir
        global file_states file_lists
        global last_clicked

        $ui_index conf -state normal
        $ui_workdir conf -state normal

        $ui_index delete 0.0 end
        $ui_workdir delete 0.0 end
        set last_clicked {}

        set file_lists($ui_index) [list]
        set file_lists($ui_workdir) [list]

        foreach path [lsort [array names file_states]] {
                set s $file_states($path)
                set m [lindex $s 0]
                set icon_name [lindex $s 1]

                set s [string index $m 0]
                if {$s ne {U} && $s ne {_}} {
                        display_all_files_helper $ui_index $path \
                                $icon_name $s
                }

                if {[string index $m 0] eq {U}} {
                        set s U
                } else {
                        set s [string index $m 1]
                }
                if {$s ne {_}} {
                        display_all_files_helper $ui_workdir $path \
                                $icon_name $s
                }
        }

        $ui_index conf -state disabled
        $ui_workdir conf -state disabled
}

proc update_indexinfo {msg pathList after} {
        global update_index_cp ui_status_value

        if {![lock_index update]} return

        set update_index_cp 0
        set pathList [lsort $pathList]
        set totalCnt [llength $pathList]
        set batch [expr {int($totalCnt * .01) + 1}]
        if {$batch > 25} {set batch 25}

        set ui_status_value [format \
                "$msg... %i/%i files (%.2f%%)" \
                $update_index_cp \
                $totalCnt \
                0.0]
        set fd [open "| git update-index -z --index-info" w]
        fconfigure $fd \
                -blocking 0 \
                -buffering full \
                -buffersize 512 \
                -translation binary
        fileevent $fd writable [list \
                write_update_indexinfo \
                $fd \
                $pathList \
                $totalCnt \
                $batch \
                $msg \
                $after \
                ]
}

proc write_update_indexinfo {fd pathList totalCnt batch msg after} {
        global update_index_cp ui_status_value
        global file_states current_diff_path

        if {$update_index_cp >= $totalCnt} {
                close $fd
                unlock_index
                uplevel #0 $after
                return
        }

        for {set i $batch} \
                {$update_index_cp < $totalCnt && $i > 0} \
                {incr i -1} {
                set path [lindex $pathList $update_index_cp]
                incr update_index_cp

                set s $file_states($path)
                switch -glob -- [lindex $s 0] {
                A? {set new _O}
                M? {set new _M}
                D_ {set new _D}
                D? {set new _?}
                ?? {continue}
                }
                set info [lindex $s 2]
                if {$info eq {}} continue

                puts -nonewline $fd "$info\t$path\0"
                display_file $path $new
        }

        set ui_status_value [format \
                "$msg... %i/%i files (%.2f%%)" \
                $update_index_cp \
                $totalCnt \
                [expr {100.0 * $update_index_cp / $totalCnt}]]
}

proc update_index {msg pathList after} {
        global update_index_cp ui_status_value

        if {![lock_index update]} return

        set update_index_cp 0
        set pathList [lsort $pathList]
        set totalCnt [llength $pathList]
        set batch [expr {int($totalCnt * .01) + 1}]
        if {$batch > 25} {set batch 25}

        set ui_status_value [format \
                "$msg... %i/%i files (%.2f%%)" \
                $update_index_cp \
                $totalCnt \
                0.0]
        set fd [open "| git update-index --add --remove -z --stdin" w]
        fconfigure $fd \
                -blocking 0 \
                -buffering full \
                -buffersize 512 \
                -translation binary
        fileevent $fd writable [list \
                write_update_index \
                $fd \
                $pathList \
                $totalCnt \
                $batch \
                $msg \
                $after \
                ]
}

proc write_update_index {fd pathList totalCnt batch msg after} {
        global update_index_cp ui_status_value
        global file_states current_diff_path

        if {$update_index_cp >= $totalCnt} {
                close $fd
                unlock_index
                uplevel #0 $after
                return
        }

        for {set i $batch} \
                {$update_index_cp < $totalCnt && $i > 0} \
                {incr i -1} {
                set path [lindex $pathList $update_index_cp]
                incr update_index_cp

                switch -glob -- [lindex $file_states($path) 0] {
                AD {set new __}
                ?D {set new D_}
                _O -
                AM {set new A_}
                U? {
                        if {[file exists $path]} {
                                set new M_
                        } else {
                                set new D_
                        }
                }
                ?M {set new M_}
                ?? {continue}
                }
                puts -nonewline $fd "$path\0"
                display_file $path $new
        }

        set ui_status_value [format \
                "$msg... %i/%i files (%.2f%%)" \
                $update_index_cp \
                $totalCnt \
                [expr {100.0 * $update_index_cp / $totalCnt}]]
}

proc checkout_index {msg pathList after} {
        global update_index_cp ui_status_value

        if {![lock_index update]} return

        set update_index_cp 0
        set pathList [lsort $pathList]
        set totalCnt [llength $pathList]
        set batch [expr {int($totalCnt * .01) + 1}]
        if {$batch > 25} {set batch 25}

        set ui_status_value [format \
                "$msg... %i/%i files (%.2f%%)" \
                $update_index_cp \
                $totalCnt \
                0.0]
        set cmd [list git checkout-index]
        lappend cmd --index
        lappend cmd --quiet
        lappend cmd --force
        lappend cmd -z
        lappend cmd --stdin
        set fd [open "| $cmd " w]
        fconfigure $fd \
                -blocking 0 \
                -buffering full \
                -buffersize 512 \
                -translation binary
        fileevent $fd writable [list \
                write_checkout_index \
                $fd \
                $pathList \
                $totalCnt \
                $batch \
                $msg \
                $after \
                ]
}

proc write_checkout_index {fd pathList totalCnt batch msg after} {
        global update_index_cp ui_status_value
        global file_states current_diff_path

        if {$update_index_cp >= $totalCnt} {
                close $fd
                unlock_index
                uplevel #0 $after
                return
        }

        for {set i $batch} \
                {$update_index_cp < $totalCnt && $i > 0} \
                {incr i -1} {
                set path [lindex $pathList $update_index_cp]
                incr update_index_cp
                switch -glob -- [lindex $file_states($path) 0] {
                U? {continue}
                ?M -
                ?D {
                        puts -nonewline $fd "$path\0"
                        display_file $path ?_
                }
                }
        }

        set ui_status_value [format \
                "$msg... %i/%i files (%.2f%%)" \
                $update_index_cp \
                $totalCnt \
                [expr {100.0 * $update_index_cp / $totalCnt}]]
}

######################################################################
##
## branch management

proc is_tracking_branch {name} {
        global tracking_branches

        if {![catch {set info $tracking_branches($name)}]} {
                return 1
        }
        foreach t [array names tracking_branches] {
                if {[string match {*/\*} $t] && [string match $t $name]} {
                        return 1
                }
        }
        return 0
}

proc load_all_heads {} {
        global all_heads

        set all_heads [list]
        set fd [open "| git for-each-ref --format=%(refname) refs/heads" r]
        while {[gets $fd line] > 0} {
                if {[is_tracking_branch $line]} continue
                if {![regsub ^refs/heads/ $line {} name]} continue
                lappend all_heads $name
        }
        close $fd

        set all_heads [lsort $all_heads]
}

proc populate_branch_menu {} {
        global all_heads disable_on_lock

        set m .mbar.branch
        set last [$m index last]
        for {set i 0} {$i <= $last} {incr i} {
                if {[$m type $i] eq {separator}} {
                        $m delete $i last
                        set new_dol [list]
                        foreach a $disable_on_lock {
                                if {[lindex $a 0] ne $m || [lindex $a 2] < $i} {
                                        lappend new_dol $a
                                }
                        }
                        set disable_on_lock $new_dol
                        break
                }
        }

        $m add separator
        foreach b $all_heads {
                $m add radiobutton \
                        -label $b \
                        -command [list switch_branch $b] \
                        -variable current_branch \
                        -value $b \
                        -font font_ui
                lappend disable_on_lock \
                        [list $m entryconf [$m index last] -state]
        }
}

proc all_tracking_branches {} {
        global tracking_branches

        set all_trackings {}
        set cmd {}
        foreach name [array names tracking_branches] {
                if {[regsub {/\*$} $name {} name]} {
                        lappend cmd $name
                } else {
                        regsub ^refs/(heads|remotes)/ $name {} name
                        lappend all_trackings $name
                }
        }

        if {$cmd ne {}} {
                set fd [open "| git for-each-ref --format=%(refname) $cmd" r]
                while {[gets $fd name] > 0} {
                        regsub ^refs/(heads|remotes)/ $name {} name
                        lappend all_trackings $name
                }
                close $fd
        }

        return [lsort -unique $all_trackings]
}

proc do_create_branch_action {w} {
        global all_heads null_sha1 repo_config
        global create_branch_checkout create_branch_revtype
        global create_branch_head create_branch_trackinghead

        set newbranch [string trim [$w.desc.name_t get 0.0 end]]
        if {$newbranch eq {}
                || $newbranch eq $repo_config(gui.newbranchtemplate)} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Please supply a branch name."
                focus $w.desc.name_t
                return
        }
        if {![catch {exec git show-ref --verify -- "refs/heads/$newbranch"}]} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Branch '$newbranch' already exists."
                focus $w.desc.name_t
                return
        }
        if {[catch {exec git check-ref-format "heads/$newbranch"}]} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "We do not like '$newbranch' as a branch name."
                focus $w.desc.name_t
                return
        }

        set rev {}
        switch -- $create_branch_revtype {
        head {set rev $create_branch_head}
        tracking {set rev $create_branch_trackinghead}
        expression {set rev [string trim [$w.from.exp_t get 0.0 end]]}
        }
        if {[catch {set cmt [exec git rev-parse --verify "${rev}^0"]}]} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Invalid starting revision: $rev"
                return
        }
        set cmd [list git update-ref]
        lappend cmd -m
        lappend cmd "branch: Created from $rev"
        lappend cmd "refs/heads/$newbranch"
        lappend cmd $cmt
        lappend cmd $null_sha1
        if {[catch {eval exec $cmd} err]} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Failed to create '$newbranch'.\n\n$err"
                return
        }

        lappend all_heads $newbranch
        set all_heads [lsort $all_heads]
        populate_branch_menu
        destroy $w
        if {$create_branch_checkout} {
                switch_branch $newbranch
        }
}

proc radio_selector {varname value args} {
        upvar #0 $varname var
        set var $value
}

trace add variable create_branch_head write \
        [list radio_selector create_branch_revtype head]
trace add variable create_branch_trackinghead write \
        [list radio_selector create_branch_revtype tracking]

trace add variable delete_branch_head write \
        [list radio_selector delete_branch_checktype head]
trace add variable delete_branch_trackinghead write \
        [list radio_selector delete_branch_checktype tracking]

proc do_create_branch {} {
        global all_heads current_branch repo_config
        global create_branch_checkout create_branch_revtype
        global create_branch_head create_branch_trackinghead

        set w .branch_editor
        toplevel $w
        wm geometry $w "+[winfo rootx .]+[winfo rooty .]"

        label $w.header -text {Create New Branch} \
                -font font_uibold
        pack $w.header -side top -fill x

        frame $w.buttons
        button $w.buttons.create -text Create \
                -font font_ui \
                -default active \
                -command [list do_create_branch_action $w]
        pack $w.buttons.create -side right
        button $w.buttons.cancel -text {Cancel} \
                -font font_ui \
                -command [list destroy $w]
        pack $w.buttons.cancel -side right -padx 5
        pack $w.buttons -side bottom -fill x -pady 10 -padx 10

        labelframe $w.desc \
                -text {Branch Description} \
                -font font_ui
        label $w.desc.name_l -text {Name:} -font font_ui
        text $w.desc.name_t \
                -borderwidth 1 \
                -relief sunken \
                -height 1 \
                -width 40 \
                -font font_ui
        $w.desc.name_t insert 0.0 $repo_config(gui.newbranchtemplate)
        grid $w.desc.name_l $w.desc.name_t -stick we -padx {0 5}
        bind $w.desc.name_t <Shift-Key-Tab> {focus [tk_focusPrev %W];break}
        bind $w.desc.name_t <Key-Tab> {focus [tk_focusNext %W];break}
        bind $w.desc.name_t <Key-Return> "do_create_branch_action $w;break"
        bind $w.desc.name_t <Key> {
                if {{%K} ne {BackSpace}
                        && {%K} ne {Tab}
                        && {%K} ne {Escape}
                        && {%K} ne {Return}} {
                        if {%k <= 32} break
                        if {[string first %A {~^:?*[}] >= 0} break
                }
        }
        grid columnconfigure $w.desc 1 -weight 1
        pack $w.desc -anchor nw -fill x -pady 5 -padx 5

        labelframe $w.from \
                -text {Starting Revision} \
                -font font_ui
        radiobutton $w.from.head_r \
                -text {Local Branch:} \
                -value head \
                -variable create_branch_revtype \
                -font font_ui
        eval tk_optionMenu $w.from.head_m create_branch_head $all_heads
        grid $w.from.head_r $w.from.head_m -sticky w
        set all_trackings [all_tracking_branches]
        if {$all_trackings ne {}} {
                set create_branch_trackinghead [lindex $all_trackings 0]
                radiobutton $w.from.tracking_r \
                        -text {Tracking Branch:} \
                        -value tracking \
                        -variable create_branch_revtype \
                        -font font_ui
                eval tk_optionMenu $w.from.tracking_m \
                        create_branch_trackinghead \
                        $all_trackings
                grid $w.from.tracking_r $w.from.tracking_m -sticky w
        }
        radiobutton $w.from.exp_r \
                -text {Revision Expression:} \
                -value expression \
                -variable create_branch_revtype \
                -font font_ui
        text $w.from.exp_t \
                -borderwidth 1 \
                -relief sunken \
                -height 1 \
                -width 50 \
                -font font_ui
        grid $w.from.exp_r $w.from.exp_t -stick we -padx {0 5}
        bind $w.from.exp_t <Shift-Key-Tab> {focus [tk_focusPrev %W];break}
        bind $w.from.exp_t <Key-Tab> {focus [tk_focusNext %W];break}
        bind $w.from.exp_t <Key-Return> "do_create_branch_action $w;break"
        bind $w.from.exp_t <Key-space> break
        bind $w.from.exp_t <Key> {set create_branch_revtype expression}
        grid columnconfigure $w.from 1 -weight 1
        pack $w.from -anchor nw -fill x -pady 5 -padx 5

        labelframe $w.postActions \
                -text {Post Creation Actions} \
                -font font_ui
        checkbutton $w.postActions.checkout \
                -text {Checkout after creation} \
                -variable create_branch_checkout \
                -font font_ui
        pack $w.postActions.checkout -anchor nw
        pack $w.postActions -anchor nw -fill x -pady 5 -padx 5

        set create_branch_checkout 1
        set create_branch_head $current_branch
        set create_branch_revtype head

        bind $w <Visibility> "grab $w; focus $w.desc.name_t"
        bind $w <Key-Escape> "destroy $w"
        bind $w <Key-Return> "do_create_branch_action $w;break"
        wm title $w "[appname] ([reponame]): Create Branch"
        tkwait window $w
}

proc do_delete_branch_action {w} {
        global all_heads
        global delete_branch_checktype delete_branch_head delete_branch_trackinghead

        set check_rev {}
        switch -- $delete_branch_checktype {
        head {set check_rev $delete_branch_head}
        tracking {set check_rev $delete_branch_trackinghead}
        always {set check_rev {:none}}
        }
        if {$check_rev eq {:none}} {
                set check_cmt {}
        } elseif {[catch {set check_cmt [exec git rev-parse --verify "${check_rev}^0"]}]} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Invalid check revision: $check_rev"
                return
        }

        set to_delete [list]
        set not_merged [list]
        foreach i [$w.list.l curselection] {
                set b [$w.list.l get $i]
                if {[catch {set o [exec git rev-parse --verify $b]}]} continue
                if {$check_cmt ne {}} {
                        if {$b eq $check_rev} continue
                        if {[catch {set m [exec git merge-base $o $check_cmt]}]} continue
                        if {$o ne $m} {
                                lappend not_merged $b
                                continue
                        }
                }
                lappend to_delete [list $b $o]
        }
        if {$not_merged ne {}} {
                set msg "The following branches are not completely merged into $check_rev:

 - [join $not_merged "\n - "]"
                tk_messageBox \
                        -icon info \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message $msg
        }
        if {$to_delete eq {}} return
        if {$delete_branch_checktype eq {always}} {
                set msg {Recovering deleted branches is difficult.

Delete the selected branches?}
                if {[tk_messageBox \
                        -icon warning \
                        -type yesno \
                        -title [wm title $w] \
                        -parent $w \
                        -message $msg] ne yes} {
                        return
                }
        }

        set failed {}
        foreach i $to_delete {
                set b [lindex $i 0]
                set o [lindex $i 1]
                if {[catch {exec git update-ref -d "refs/heads/$b" $o} err]} {
                        append failed " - $b: $err\n"
                } else {
                        set x [lsearch -sorted $all_heads $b]
                        if {$x >= 0} {
                                set all_heads [lreplace $all_heads $x $x]
                        }
                }
        }

        if {$failed ne {}} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Failed to delete branches:\n$failed"
        }

        set all_heads [lsort $all_heads]
        populate_branch_menu
        destroy $w
}

proc do_delete_branch {} {
        global all_heads tracking_branches current_branch
        global delete_branch_checktype delete_branch_head delete_branch_trackinghead

        set w .branch_editor
        toplevel $w
        wm geometry $w "+[winfo rootx .]+[winfo rooty .]"

        label $w.header -text {Delete Local Branch} \
                -font font_uibold
        pack $w.header -side top -fill x

        frame $w.buttons
        button $w.buttons.create -text Delete \
                -font font_ui \
                -command [list do_delete_branch_action $w]
        pack $w.buttons.create -side right
        button $w.buttons.cancel -text {Cancel} \
                -font font_ui \
                -command [list destroy $w]
        pack $w.buttons.cancel -side right -padx 5
        pack $w.buttons -side bottom -fill x -pady 10 -padx 10

        labelframe $w.list \
                -text {Local Branches} \
                -font font_ui
        listbox $w.list.l \
                -height 10 \
                -width 50 \
                -selectmode extended \
                -font font_ui
        foreach h $all_heads {
                if {$h ne $current_branch} {
                        $w.list.l insert end $h
                }
        }
        pack $w.list.l -fill both -pady 5 -padx 5
        pack $w.list -fill both -pady 5 -padx 5

        labelframe $w.validate \
                -text {Delete Only If} \
                -font font_ui
        radiobutton $w.validate.head_r \
                -text {Merged Into Local Branch:} \
                -value head \
                -variable delete_branch_checktype \
                -font font_ui
        eval tk_optionMenu $w.validate.head_m delete_branch_head $all_heads
        grid $w.validate.head_r $w.validate.head_m -sticky w
        set all_trackings [all_tracking_branches]
        if {$all_trackings ne {}} {
                set delete_branch_trackinghead [lindex $all_trackings 0]
                radiobutton $w.validate.tracking_r \
                        -text {Merged Into Tracking Branch:} \
                        -value tracking \
                        -variable delete_branch_checktype \
                        -font font_ui
                eval tk_optionMenu $w.validate.tracking_m \
                        delete_branch_trackinghead \
                        $all_trackings
                grid $w.validate.tracking_r $w.validate.tracking_m -sticky w
        }
        radiobutton $w.validate.always_r \
                -text {Always (Do not perform merge checks)} \
                -value always \
                -variable delete_branch_checktype \
                -font font_ui
        grid $w.validate.always_r -columnspan 2 -sticky w
        grid columnconfigure $w.validate 1 -weight 1
        pack $w.validate -anchor nw -fill x -pady 5 -padx 5

        set delete_branch_head $current_branch
        set delete_branch_checktype head

        bind $w <Visibility> "grab $w; focus $w"
        bind $w <Key-Escape> "destroy $w"
        wm title $w "[appname] ([reponame]): Delete Branch"
        tkwait window $w
}

proc switch_branch {b} {
        global HEAD commit_type file_states current_branch
        global selected_commit_type ui_comm

        if {![lock_index switch]} return

        # -- Backup the selected branch (repository_state resets it)
        #
        set new_branch $current_branch

        # -- Our in memory state should match the repository.
        #
        repository_state curType curHEAD curMERGE_HEAD
        if {[string match amend* $commit_type]
                && $curType eq {normal}
                && $curHEAD eq $HEAD} {
        } elseif {$commit_type ne $curType || $HEAD ne $curHEAD} {
                info_popup {Last scanned state does not match repository state.

Another Git program has modified this repository
since the last scan.  A rescan must be performed
before the current branch can be changed.

The rescan will be automatically started now.
}
                unlock_index
                rescan {set ui_status_value {Ready.}}
                return
        }

        # -- Toss the message buffer if we are in amend mode.
        #
        if {[string match amend* $curType]} {
                $ui_comm delete 0.0 end
                $ui_comm edit reset
                $ui_comm edit modified false
        }

        set selected_commit_type new
        set current_branch $new_branch

        unlock_index
        error "NOT FINISHED"
}

######################################################################
##
## remote management

proc load_all_remotes {} {
        global repo_config
        global all_remotes tracking_branches

        set all_remotes [list]
        array unset tracking_branches

        set rm_dir [gitdir remotes]
        if {[file isdirectory $rm_dir]} {
                set all_remotes [glob \
                        -types f \
                        -tails \
                        -nocomplain \
                        -directory $rm_dir *]

                foreach name $all_remotes {
                        catch {
                                set fd [open [file join $rm_dir $name] r]
                                while {[gets $fd line] >= 0} {
                                        if {![regexp {^Pull:[   ]*([^:]+):(.+)$} \
                                                $line line src dst]} continue
                                        if {![regexp ^refs/ $dst]} {
                                                set dst "refs/heads/$dst"
                                        }
                                        set tracking_branches($dst) [list $name $src]
                                }
                                close $fd
                        }
                }
        }

        foreach line [array names repo_config remote.*.url] {
                if {![regexp ^remote\.(.*)\.url\$ $line line name]} continue
                lappend all_remotes $name

                if {[catch {set fl $repo_config(remote.$name.fetch)}]} {
                        set fl {}
                }
                foreach line $fl {
                        if {![regexp {^([^:]+):(.+)$} $line line src dst]} continue
                        if {![regexp ^refs/ $dst]} {
                                set dst "refs/heads/$dst"
                        }
                        set tracking_branches($dst) [list $name $src]
                }
        }

        set all_remotes [lsort -unique $all_remotes]
}

proc populate_fetch_menu {m} {
        global all_remotes repo_config

        foreach r $all_remotes {
                set enable 0
                if {![catch {set a $repo_config(remote.$r.url)}]} {
                        if {![catch {set a $repo_config(remote.$r.fetch)}]} {
                                set enable 1
                        }
                } else {
                        catch {
                                set fd [open [gitdir remotes $r] r]
                                while {[gets $fd n] >= 0} {
                                        if {[regexp {^Pull:[ \t]*([^:]+):} $n]} {
                                                set enable 1
                                                break
                                        }
                                }
                                close $fd
                        }
                }

                if {$enable} {
                        $m add command \
                                -label "Fetch from $r..." \
                                -command [list fetch_from $r] \
                                -font font_ui
                }
        }
}

proc populate_push_menu {m} {
        global all_remotes repo_config

        foreach r $all_remotes {
                set enable 0
                if {![catch {set a $repo_config(remote.$r.url)}]} {
                        if {![catch {set a $repo_config(remote.$r.push)}]} {
                                set enable 1
                        }
                } else {
                        catch {
                                set fd [open [gitdir remotes $r] r]
                                while {[gets $fd n] >= 0} {
                                        if {[regexp {^Push:[ \t]*([^:]+):} $n]} {
                                                set enable 1
                                                break
                                        }
                                }
                                close $fd
                        }
                }

                if {$enable} {
                        $m add command \
                                -label "Push to $r..." \
                                -command [list push_to $r] \
                                -font font_ui
                }
        }
}

proc populate_pull_menu {m} {
        global repo_config all_remotes disable_on_lock

        foreach remote $all_remotes {
                set rb_list [list]
                if {[array get repo_config remote.$remote.url] ne {}} {
                        if {[array get repo_config remote.$remote.fetch] ne {}} {
                                foreach line $repo_config(remote.$remote.fetch) {
                                        if {[regexp {^([^:]+):} $line line rb]} {
                                                lappend rb_list $rb
                                        }
                                }
                        }
                } else {
                        catch {
                                set fd [open [gitdir remotes $remote] r]
                                while {[gets $fd line] >= 0} {
                                        if {[regexp {^Pull:[ \t]*([^:]+):} $line line rb]} {
                                                lappend rb_list $rb
                                        }
                                }
                                close $fd
                        }
                }

                foreach rb $rb_list {
                        regsub ^refs/heads/ $rb {} rb_short
                        $m add command \
                                -label "Branch $rb_short from $remote..." \
                                -command [list pull_remote $remote $rb] \
                                -font font_ui
                        lappend disable_on_lock \
                                [list $m entryconf [$m index last] -state]
                }
        }
}

######################################################################
##
## icons

set filemask {
#define mask_width 14
#define mask_height 15
static unsigned char mask_bits[] = {
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f,
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f,
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f};
}

image create bitmap file_plain -background white -foreground black -data {
#define plain_width 14
#define plain_height 15
static unsigned char plain_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x02, 0x05, 0x02, 0x09, 0x02, 0x1f, 0x02, 0x10,
   0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10,
   0x02, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_mod -background white -foreground blue -data {
#define mod_width 14
#define mod_height 15
static unsigned char mod_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x7a, 0x05, 0x02, 0x09, 0x7a, 0x1f, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_fulltick -background white -foreground "#007000" -data {
#define file_fulltick_width 14
#define file_fulltick_height 15
static unsigned char file_fulltick_bits[] = {
   0xfe, 0x01, 0x02, 0x1a, 0x02, 0x0c, 0x02, 0x0c, 0x02, 0x16, 0x02, 0x16,
   0x02, 0x13, 0x00, 0x13, 0x86, 0x11, 0x8c, 0x11, 0xd8, 0x10, 0xf2, 0x10,
   0x62, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_parttick -background white -foreground "#005050" -data {
#define parttick_width 14
#define parttick_height 15
static unsigned char parttick_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x7a, 0x05, 0x02, 0x09, 0x7a, 0x1f, 0x02, 0x10,
   0x7a, 0x14, 0x02, 0x16, 0x02, 0x13, 0x8a, 0x11, 0xda, 0x10, 0x72, 0x10,
   0x22, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_question -background white -foreground black -data {
#define file_question_width 14
#define file_question_height 15
static unsigned char file_question_bits[] = {
   0xfe, 0x01, 0x02, 0x02, 0xe2, 0x04, 0xf2, 0x09, 0x1a, 0x1b, 0x0a, 0x13,
   0x82, 0x11, 0xc2, 0x10, 0x62, 0x10, 0x62, 0x10, 0x02, 0x10, 0x62, 0x10,
   0x62, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_removed -background white -foreground red -data {
#define file_removed_width 14
#define file_removed_height 15
static unsigned char file_removed_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x02, 0x05, 0x02, 0x09, 0x02, 0x1f, 0x02, 0x10,
   0x1a, 0x16, 0x32, 0x13, 0xe2, 0x11, 0xc2, 0x10, 0xe2, 0x11, 0x32, 0x13,
   0x1a, 0x16, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_merge -background white -foreground blue -data {
#define file_merge_width 14
#define file_merge_height 15
static unsigned char file_merge_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x62, 0x05, 0x62, 0x09, 0x62, 0x1f, 0x62, 0x10,
   0xfa, 0x11, 0xf2, 0x10, 0x62, 0x10, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

set ui_index .vpane.files.index.list
set ui_workdir .vpane.files.workdir.list

set all_icons(_$ui_index)   file_plain
set all_icons(A$ui_index)   file_fulltick
set all_icons(M$ui_index)   file_fulltick
set all_icons(D$ui_index)   file_removed
set all_icons(U$ui_index)   file_merge

set all_icons(_$ui_workdir) file_plain
set all_icons(M$ui_workdir) file_mod
set all_icons(D$ui_workdir) file_question
set all_icons(U$ui_workdir) file_merge
set all_icons(O$ui_workdir) file_plain

set max_status_desc 0
foreach i {
                {__ "Unmodified"}

                {_M "Modified, not staged"}
                {M_ "Staged for commit"}
                {MM "Portions staged for commit"}
                {MD "Staged for commit, missing"}

                {_O "Untracked, not staged"}
                {A_ "Staged for commit"}
                {AM "Portions staged for commit"}
                {AD "Staged for commit, missing"}

                {_D "Missing"}
                {D_ "Staged for removal"}
                {DO "Staged for removal, still present"}

                {U_ "Requires merge resolution"}
                {UU "Requires merge resolution"}
                {UM "Requires merge resolution"}
                {UD "Requires merge resolution"}
        } {
        if {$max_status_desc < [string length [lindex $i 1]]} {
                set max_status_desc [string length [lindex $i 1]]
        }
        set all_descs([lindex $i 0]) [lindex $i 1]
}
unset i

######################################################################
##
## util

proc is_MacOSX {} {
        global tcl_platform tk_library
        if {[tk windowingsystem] eq {aqua}} {
                return 1
        }
        return 0
}

proc is_Windows {} {
        global tcl_platform
        if {$tcl_platform(platform) eq {windows}} {
                return 1
        }
        return 0
}

proc bind_button3 {w cmd} {
        bind $w <Any-Button-3> $cmd
        if {[is_MacOSX]} {
                bind $w <Control-Button-1> $cmd
        }
}

proc incr_font_size {font {amt 1}} {
        set sz [font configure $font -size]
        incr sz $amt
        font configure $font -size $sz
        font configure ${font}bold -size $sz
}

proc hook_failed_popup {hook msg} {
        set w .hookfail
        toplevel $w

        frame $w.m
        label $w.m.l1 -text "$hook hook failed:" \
                -anchor w \
                -justify left \
                -font font_uibold
        text $w.m.t \
                -background white -borderwidth 1 \
                -relief sunken \
                -width 80 -height 10 \
                -font font_diff \
                -yscrollcommand [list $w.m.sby set]
        label $w.m.l2 \
                -text {You must correct the above errors before committing.} \
                -anchor w \
                -justify left \
                -font font_uibold
        scrollbar $w.m.sby -command [list $w.m.t yview]
        pack $w.m.l1 -side top -fill x
        pack $w.m.l2 -side bottom -fill x
        pack $w.m.sby -side right -fill y
        pack $w.m.t -side left -fill both -expand 1
        pack $w.m -side top -fill both -expand 1 -padx 5 -pady 10

        $w.m.t insert 1.0 $msg
        $w.m.t conf -state disabled

        button $w.ok -text OK \
                -width 15 \
                -font font_ui \
                -command "destroy $w"
        pack $w.ok -side bottom -anchor e -pady 10 -padx 10

        bind $w <Visibility> "grab $w; focus $w"
        bind $w <Key-Return> "destroy $w"
        wm title $w "[appname] ([reponame]): error"
        tkwait window $w
}

set next_console_id 0

proc new_console {short_title long_title} {
        global next_console_id console_data
        set w .console[incr next_console_id]
        set console_data($w) [list $short_title $long_title]
        return [console_init $w]
}

proc console_init {w} {
        global console_cr console_data M1B

        set console_cr($w) 1.0
        toplevel $w
        frame $w.m
        label $w.m.l1 -text "[lindex $console_data($w) 1]:" \
                -anchor w \
                -justify left \
                -font font_uibold
        text $w.m.t \
                -background white -borderwidth 1 \
                -relief sunken \
                -width 80 -height 10 \
                -font font_diff \
                -state disabled \
                -yscrollcommand [list $w.m.sby set]
        label $w.m.s -text {Working... please wait...} \
                -anchor w \
                -justify left \
                -font font_uibold
        scrollbar $w.m.sby -command [list $w.m.t yview]
        pack $w.m.l1 -side top -fill x
        pack $w.m.s -side bottom -fill x
        pack $w.m.sby -side right -fill y
        pack $w.m.t -side left -fill both -expand 1
        pack $w.m -side top -fill both -expand 1 -padx 5 -pady 10

        menu $w.ctxm -tearoff 0
        $w.ctxm add command -label "Copy" \
                -font font_ui \
                -command "tk_textCopy $w.m.t"
        $w.ctxm add command -label "Select All" \
                -font font_ui \
                -command "focus $w.m.t;$w.m.t tag add sel 0.0 end"
        $w.ctxm add command -label "Copy All" \
                -font font_ui \
                -command "
                        $w.m.t tag add sel 0.0 end
                        tk_textCopy $w.m.t
                        $w.m.t tag remove sel 0.0 end
                "

        button $w.ok -text {Close} \
                -font font_ui \
                -state disabled \
                -command "destroy $w"
        pack $w.ok -side bottom -anchor e -pady 10 -padx 10

        bind_button3 $w.m.t "tk_popup $w.ctxm %X %Y"
        bind $w.m.t <$M1B-Key-a> "$w.m.t tag add sel 0.0 end;break"
        bind $w.m.t <$M1B-Key-A> "$w.m.t tag add sel 0.0 end;break"
        bind $w <Visibility> "focus $w"
        wm title $w "[appname] ([reponame]): [lindex $console_data($w) 0]"
        return $w
}

proc console_exec {w cmd {after {}}} {
        # -- Windows tosses the enviroment when we exec our child.
        #    But most users need that so we have to relogin. :-(
        #
        if {[is_Windows]} {
                set cmd [list sh --login -c "cd \"[pwd]\" && [join $cmd { }]"]
        }

        # -- Tcl won't let us redirect both stdout and stderr to
        #    the same pipe.  So pass it through cat...
        #
        set cmd [concat | $cmd |& cat]

        set fd_f [open $cmd r]
        fconfigure $fd_f -blocking 0 -translation binary
        fileevent $fd_f readable [list console_read $w $fd_f $after]
}

proc console_read {w fd after} {
        global console_cr console_data

        set buf [read $fd]
        if {$buf ne {}} {
                if {![winfo exists $w]} {console_init $w}
                $w.m.t conf -state normal
                set c 0
                set n [string length $buf]
                while {$c < $n} {
                        set cr [string first "\r" $buf $c]
                        set lf [string first "\n" $buf $c]
                        if {$cr < 0} {set cr [expr {$n + 1}]}
                        if {$lf < 0} {set lf [expr {$n + 1}]}

                        if {$lf < $cr} {
                                $w.m.t insert end [string range $buf $c $lf]
                                set console_cr($w) [$w.m.t index {end -1c}]
                                set c $lf
                                incr c
                        } else {
                                $w.m.t delete $console_cr($w) end
                                $w.m.t insert end "\n"
                                $w.m.t insert end [string range $buf $c $cr]
                                set c $cr
                                incr c
                        }
                }
                $w.m.t conf -state disabled
                $w.m.t see end
        }

        fconfigure $fd -blocking 1
        if {[eof $fd]} {
                if {[catch {close $fd}]} {
                        if {![winfo exists $w]} {console_init $w}
                        $w.m.s conf -background red -text {Error: Command Failed}
                        $w.ok conf -state normal
                        set ok 0
                } elseif {[winfo exists $w]} {
                        $w.m.s conf -background green -text {Success}
                        $w.ok conf -state normal
                        set ok 1
                }
                array unset console_cr $w
                array unset console_data $w
                if {$after ne {}} {
                        uplevel #0 $after $ok
                }
                return
        }
        fconfigure $fd -blocking 0
}

######################################################################
##
## ui commands

set starting_gitk_msg {Starting gitk... please wait...}

proc do_gitk {revs} {
        global ui_status_value starting_gitk_msg

        set cmd gitk
        if {$revs ne {}} {
                append cmd { }
                append cmd $revs
        }
        if {[is_Windows]} {
                set cmd "sh -c \"exec $cmd\""
        }
        append cmd { &}

        if {[catch {eval exec $cmd} err]} {
                error_popup "Failed to start gitk:\n\n$err"
        } else {
                set ui_status_value $starting_gitk_msg
                after 10000 {
                        if {$ui_status_value eq $starting_gitk_msg} {
                                set ui_status_value {Ready.}
                        }
                }
        }
}

proc do_gc {} {
        set w [new_console {gc} {Compressing the object database}]
        console_exec $w {git gc}
}

proc do_fsck_objects {} {
        set w [new_console {fsck-objects} \
                {Verifying the object database with fsck-objects}]
        set cmd [list git fsck-objects]
        lappend cmd --full
        lappend cmd --cache
        lappend cmd --strict
        console_exec $w $cmd
}

set is_quitting 0

proc do_quit {} {
        global ui_comm is_quitting repo_config commit_type

        if {$is_quitting} return
        set is_quitting 1

        # -- Stash our current commit buffer.
        #
        set save [gitdir GITGUI_MSG]
        set msg [string trim [$ui_comm get 0.0 end]]
        if {![string match amend* $commit_type]
                && [$ui_comm edit modified]
                && $msg ne {}} {
                catch {
                        set fd [open $save w]
                        puts $fd [string trim [$ui_comm get 0.0 end]]
                        close $fd
                }
        } else {
                catch {file delete $save}
        }

        # -- Stash our current window geometry into this repository.
        #
        set cfg_geometry [list]
        lappend cfg_geometry [wm geometry .]
        lappend cfg_geometry [lindex [.vpane sash coord 0] 1]
        lappend cfg_geometry [lindex [.vpane.files sash coord 0] 0]
        if {[catch {set rc_geometry $repo_config(gui.geometry)}]} {
                set rc_geometry {}
        }
        if {$cfg_geometry ne $rc_geometry} {
                catch {exec git repo-config gui.geometry $cfg_geometry}
        }

        destroy .
}

proc do_rescan {} {
        rescan {set ui_status_value {Ready.}}
}

proc unstage_helper {txt paths} {
        global file_states current_diff_path

        if {![lock_index begin-update]} return

        set pathList [list]
        set after {}
        foreach path $paths {
                switch -glob -- [lindex $file_states($path) 0] {
                A? -
                M? -
                D? {
                        lappend pathList $path
                        if {$path eq $current_diff_path} {
                                set after {reshow_diff;}
                        }
                }
                }
        }
        if {$pathList eq {}} {
                unlock_index
        } else {
                update_indexinfo \
                        $txt \
                        $pathList \
                        [concat $after {set ui_status_value {Ready.}}]
        }
}

proc do_unstage_selection {} {
        global current_diff_path selected_paths

        if {[array size selected_paths] > 0} {
                unstage_helper \
                        {Unstaging selected files from commit} \
                        [array names selected_paths]
        } elseif {$current_diff_path ne {}} {
                unstage_helper \
                        "Unstaging [short_path $current_diff_path] from commit" \
                        [list $current_diff_path]
        }
}

proc add_helper {txt paths} {
        global file_states current_diff_path

        if {![lock_index begin-update]} return

        set pathList [list]
        set after {}
        foreach path $paths {
                switch -glob -- [lindex $file_states($path) 0] {
                _O -
                ?M -
                ?D -
                U? {
                        lappend pathList $path
                        if {$path eq $current_diff_path} {
                                set after {reshow_diff;}
                        }
                }
                }
        }
        if {$pathList eq {}} {
                unlock_index
        } else {
                update_index \
                        $txt \
                        $pathList \
                        [concat $after {set ui_status_value {Ready to commit.}}]
        }
}

proc do_add_selection {} {
        global current_diff_path selected_paths

        if {[array size selected_paths] > 0} {
                add_helper \
                        {Adding selected files} \
                        [array names selected_paths]
        } elseif {$current_diff_path ne {}} {
                add_helper \
                        "Adding [short_path $current_diff_path]" \
                        [list $current_diff_path]
        }
}

proc do_add_all {} {
        global file_states

        set paths [list]
        foreach path [array names file_states] {
                switch -glob -- [lindex $file_states($path) 0] {
                U? {continue}
                ?M -
                ?D {lappend paths $path}
                }
        }
        add_helper {Adding all changed files} $paths
}

proc revert_helper {txt paths} {
        global file_states current_diff_path

        if {![lock_index begin-update]} return

        set pathList [list]
        set after {}
        foreach path $paths {
                switch -glob -- [lindex $file_states($path) 0] {
                U? {continue}
                ?M -
                ?D {
                        lappend pathList $path
                        if {$path eq $current_diff_path} {
                                set after {reshow_diff;}
                        }
                }
                }
        }

        set n [llength $pathList]
        if {$n == 0} {
                unlock_index
                return
        } elseif {$n == 1} {
                set s "[short_path [lindex $pathList]]"
        } else {
                set s "these $n files"
        }

        set reply [tk_dialog \
                .confirm_revert \
                "[appname] ([reponame])" \
                "Revert changes in $s?

Any unadded changes will be permanently lost by the revert." \
                question \
                1 \
                {Do Nothing} \
                {Revert Changes} \
                ]
        if {$reply == 1} {
                checkout_index \
                        $txt \
                        $pathList \
                        [concat $after {set ui_status_value {Ready.}}]
        } else {
                unlock_index
        }
}

proc do_revert_selection {} {
        global current_diff_path selected_paths

        if {[array size selected_paths] > 0} {
                revert_helper \
                        {Reverting selected files} \
                        [array names selected_paths]
        } elseif {$current_diff_path ne {}} {
                revert_helper \
                        "Reverting [short_path $current_diff_path]" \
                        [list $current_diff_path]
        }
}

proc do_signoff {} {
        global ui_comm

        set me [committer_ident]
        if {$me eq {}} return

        set sob "Signed-off-by: $me"
        set last [$ui_comm get {end -1c linestart} {end -1c}]
        if {$last ne $sob} {
                $ui_comm edit separator
                if {$last ne {}
                        && ![regexp {^[A-Z][A-Za-z]*-[A-Za-z-]+: *} $last]} {
                        $ui_comm insert end "\n"
                }
                $ui_comm insert end "\n$sob"
                $ui_comm edit separator
                $ui_comm see end
        }
}

proc do_select_commit_type {} {
        global commit_type selected_commit_type

        if {$selected_commit_type eq {new}
                && [string match amend* $commit_type]} {
                create_new_commit
        } elseif {$selected_commit_type eq {amend}
                && ![string match amend* $commit_type]} {
                load_last_commit

                # The amend request was rejected...
                #
                if {![string match amend* $commit_type]} {
                        set selected_commit_type new
                }
        }
}

proc do_commit {} {
        commit_tree
}

proc do_about {} {
        global appvers copyright
        global tcl_patchLevel tk_patchLevel

        set w .about_dialog
        toplevel $w
        wm geometry $w "+[winfo rootx .]+[winfo rooty .]"

        label $w.header -text "About [appname]" \
                -font font_uibold
        pack $w.header -side top -fill x

        frame $w.buttons
        button $w.buttons.close -text {Close} \
                -font font_ui \
                -command [list destroy $w]
        pack $w.buttons.close -side right
        pack $w.buttons -side bottom -fill x -pady 10 -padx 10

        label $w.desc \
                -text "[appname] - a commit creation tool for Git.
$copyright" \
                -padx 5 -pady 5 \
                -justify left \
                -anchor w \
                -borderwidth 1 \
                -relief solid \
                -font font_ui
        pack $w.desc -side top -fill x -padx 5 -pady 5

        set v {}
        append v "[appname] version $appvers\n"
        append v "[exec git version]\n"
        append v "\n"
        if {$tcl_patchLevel eq $tk_patchLevel} {
                append v "Tcl/Tk version $tcl_patchLevel"
        } else {
                append v "Tcl version $tcl_patchLevel"
                append v ", Tk version $tk_patchLevel"
        }

        label $w.vers \
                -text $v \
                -padx 5 -pady 5 \
                -justify left \
                -anchor w \
                -borderwidth 1 \
                -relief solid \
                -font font_ui
        pack $w.vers -side top -fill x -padx 5 -pady 5

        menu $w.ctxm -tearoff 0
        $w.ctxm add command \
                -label {Copy} \
                -font font_ui \
                -command "
                clipboard clear
                clipboard append -format STRING -type STRING -- \[$w.vers cget -text\]
        "

        bind $w <Visibility> "grab $w; focus $w"
        bind $w <Key-Escape> "destroy $w"
        bind_button3 $w.vers "tk_popup $w.ctxm %X %Y; grab $w; focus $w"
        wm title $w "About [appname]"
        tkwait window $w
}

proc do_options {} {
        global repo_config global_config font_descs
        global repo_config_new global_config_new

        array unset repo_config_new
        array unset global_config_new
        foreach name [array names repo_config] {
                set repo_config_new($name) $repo_config($name)
        }
        load_config 1
        foreach name [array names repo_config] {
                switch -- $name {
                gui.diffcontext {continue}
                }
                set repo_config_new($name) $repo_config($name)
        }
        foreach name [array names global_config] {
                set global_config_new($name) $global_config($name)
        }

        set w .options_editor
        toplevel $w
        wm geometry $w "+[winfo rootx .]+[winfo rooty .]"

        label $w.header -text "[appname] Options" \
                -font font_uibold
        pack $w.header -side top -fill x

        frame $w.buttons
        button $w.buttons.restore -text {Restore Defaults} \
                -font font_ui \
                -command do_restore_defaults
        pack $w.buttons.restore -side left
        button $w.buttons.save -text Save \
                -font font_ui \
                -command "
                        catch {eval \[bind \[focus -displayof $w\] <FocusOut>\]}
                        do_save_config $w
                "
        pack $w.buttons.save -side right
        button $w.buttons.cancel -text {Cancel} \
                -font font_ui \
                -command [list destroy $w]
        pack $w.buttons.cancel -side right -padx 5
        pack $w.buttons -side bottom -fill x -pady 10 -padx 10

        labelframe $w.repo -text "[reponame] Repository" \
                -font font_ui \
                -relief raised -borderwidth 2
        labelframe $w.global -text {Global (All Repositories)} \
                -font font_ui \
                -relief raised -borderwidth 2
        pack $w.repo -side left -fill both -expand 1 -pady 5 -padx 5
        pack $w.global -side right -fill both -expand 1 -pady 5 -padx 5

        foreach option {
                {b pullsummary {Show Pull Summary}}
                {b trustmtime  {Trust File Modification Timestamps}}
                {i diffcontext {Number of Diff Context Lines}}
                {t newbranchtemplate {New Branch Name Template}}
                } {
                set type [lindex $option 0]
                set name [lindex $option 1]
                set text [lindex $option 2]
                foreach f {repo global} {
                        switch $type {
                        b {
                                checkbutton $w.$f.$name -text $text \
                                        -variable ${f}_config_new(gui.$name) \
                                        -onvalue true \
                                        -offvalue false \
                                        -font font_ui
                                pack $w.$f.$name -side top -anchor w
                        }
                        i {
                                frame $w.$f.$name
                                label $w.$f.$name.l -text "$text:" -font font_ui
                                pack $w.$f.$name.l -side left -anchor w -fill x
                                spinbox $w.$f.$name.v \
                                        -textvariable ${f}_config_new(gui.$name) \
                                        -from 1 -to 99 -increment 1 \
                                        -width 3 \
                                        -font font_ui
                                bind $w.$f.$name.v <FocusIn> {%W selection range 0 end}
                                pack $w.$f.$name.v -side right -anchor e -padx 5
                                pack $w.$f.$name -side top -anchor w -fill x
                        }
                        t {
                                frame $w.$f.$name
                                label $w.$f.$name.l -text "$text:" -font font_ui
                                text $w.$f.$name.v \
                                        -borderwidth 1 \
                                        -relief sunken \
                                        -height 1 \
                                        -width 20 \
                                        -font font_ui
                                $w.$f.$name.v insert 0.0 [set ${f}_config_new(gui.$name)]
                                bind $w.$f.$name.v <Shift-Key-Tab> {focus [tk_focusPrev %W];break}
                                bind $w.$f.$name.v <Key-Tab> {focus [tk_focusNext %W];break}
                                bind $w.$f.$name.v <Key-Return> break
                                bind $w.$f.$name.v <FocusIn> "$w.$f.$name.v tag add sel 0.0 end"
                                bind $w.$f.$name.v <FocusOut> "
                                        set ${f}_config_new(gui.$name) \
                                        \[string trim \[$w.$f.$name.v get 0.0 end\]\]
                                "
                                pack $w.$f.$name.l -side left -anchor w
                                pack $w.$f.$name.v -side left -anchor w \
                                        -fill x -expand 1 \
                                        -padx 5
                                pack $w.$f.$name -side top -anchor w -fill x
                        }
                        }
                }
        }

        set all_fonts [lsort [font families]]
        foreach option $font_descs {
                set name [lindex $option 0]
                set font [lindex $option 1]
                set text [lindex $option 2]

                set global_config_new(gui.$font^^family) \
                        [font configure $font -family]
                set global_config_new(gui.$font^^size) \
                        [font configure $font -size]

                frame $w.global.$name
                label $w.global.$name.l -text "$text:" -font font_ui
                pack $w.global.$name.l -side left -anchor w -fill x
                eval tk_optionMenu $w.global.$name.family \
                        global_config_new(gui.$font^^family) \
                        $all_fonts
                spinbox $w.global.$name.size \
                        -textvariable global_config_new(gui.$font^^size) \
                        -from 2 -to 80 -increment 1 \
                        -width 3 \
                        -font font_ui
                bind $w.global.$name.size <FocusIn> {%W selection range 0 end}
                pack $w.global.$name.size -side right -anchor e
                pack $w.global.$name.family -side right -anchor e
                pack $w.global.$name -side top -anchor w -fill x
        }

        bind $w <Visibility> "grab $w; focus $w"
        bind $w <Key-Escape> "destroy $w"
        wm title $w "[appname] ([reponame]): Options"
        tkwait window $w
}

proc do_restore_defaults {} {
        global font_descs default_config repo_config
        global repo_config_new global_config_new

        foreach name [array names default_config] {
                set repo_config_new($name) $default_config($name)
                set global_config_new($name) $default_config($name)
        }

        foreach option $font_descs {
                set name [lindex $option 0]
                set repo_config(gui.$name) $default_config(gui.$name)
        }
        apply_config

        foreach option $font_descs {
                set name [lindex $option 0]
                set font [lindex $option 1]
                set global_config_new(gui.$font^^family) \
                        [font configure $font -family]
                set global_config_new(gui.$font^^size) \
                        [font configure $font -size]
        }
}

proc do_save_config {w} {
        if {[catch {save_config} err]} {
                error_popup "Failed to completely save options:\n\n$err"
        }
        reshow_diff
        destroy $w
}

proc do_windows_shortcut {} {
        global argv0

        if {[catch {
                set desktop [exec cygpath \
                        --windows \
                        --absolute \
                        --long-name \
                        --desktop]
                }]} {
                        set desktop .
        }
        set fn [tk_getSaveFile \
                -parent . \
                -title "[appname] ([reponame]): Create Desktop Icon" \
                -initialdir $desktop \
                -initialfile "Git [reponame].bat"]
        if {$fn != {}} {
                if {[catch {
                                set fd [open $fn w]
                                set sh [exec cygpath \
                                        --windows \
                                        --absolute \
                                        /bin/sh]
                                set me [exec cygpath \
                                        --unix \
                                        --absolute \
                                        $argv0]
                                set gd [exec cygpath \
                                        --unix \
                                        --absolute \
                                        [gitdir]]
                                set gw [exec cygpath \
                                        --windows \
                                        --absolute \
                                        [file dirname [gitdir]]]
                                regsub -all ' $me "'\\''" me
                                regsub -all ' $gd "'\\''" gd
                                puts $fd "@ECHO Entering $gw"
                                puts $fd "@ECHO Starting git-gui... please wait..."
                                puts -nonewline $fd "@\"$sh\" --login -c \""
                                puts -nonewline $fd "GIT_DIR='$gd'"
                                puts -nonewline $fd " '$me'"
                                puts $fd "&\""
                                close $fd
                        } err]} {
                        error_popup "Cannot write script:\n\n$err"
                }
        }
}

proc do_macosx_app {} {
        global argv0 env

        set fn [tk_getSaveFile \
                -parent . \
                -title "[appname] ([reponame]): Create Desktop Icon" \
                -initialdir [file join $env(HOME) Desktop] \
                -initialfile "Git [reponame].app"]
        if {$fn != {}} {
                if {[catch {
                                set Contents [file join $fn Contents]
                                set MacOS [file join $Contents MacOS]
                                set exe [file join $MacOS git-gui]

                                file mkdir $MacOS

                                set fd [open [file join $Contents Info.plist] w]
                                puts $fd {<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>CFBundleDevelopmentRegion</key>
        <string>English</string>
        <key>CFBundleExecutable</key>
        <string>git-gui</string>
        <key>CFBundleIdentifier</key>
        <string>org.spearce.git-gui</string>
        <key>CFBundleInfoDictionaryVersion</key>
        <string>6.0</string>
        <key>CFBundlePackageType</key>
        <string>APPL</string>
        <key>CFBundleSignature</key>
        <string>????</string>
        <key>CFBundleVersion</key>
        <string>1.0</string>
        <key>NSPrincipalClass</key>
        <string>NSApplication</string>
</dict>
</plist>}
                                close $fd

                                set fd [open $exe w]
                                set gd [file normalize [gitdir]]
                                set ep [file normalize [exec git --exec-path]]
                                regsub -all ' $gd "'\\''" gd
                                regsub -all ' $ep "'\\''" ep
                                puts $fd "#!/bin/sh"
                                foreach name [array names env] {
                                        if {[string match GIT_* $name]} {
                                                regsub -all ' $env($name) "'\\''" v
                                                puts $fd "export $name='$v'"
                                        }
                                }
                                puts $fd "export PATH='$ep':\$PATH"
                                puts $fd "export GIT_DIR='$gd'"
                                puts $fd "exec [file normalize $argv0]"
                                close $fd

                                file attributes $exe -permissions u+x,g+x,o+x
                        } err]} {
                        error_popup "Cannot write icon:\n\n$err"
                }
        }
}

proc toggle_or_diff {w x y} {
        global file_states file_lists current_diff_path ui_index ui_workdir
        global last_clicked selected_paths

        set pos [split [$w index @$x,$y] .]
        set lno [lindex $pos 0]
        set col [lindex $pos 1]
        set path [lindex $file_lists($w) [expr {$lno - 1}]]
        if {$path eq {}} {
                set last_clicked {}
                return
        }

        set last_clicked [list $w $lno]
        array unset selected_paths
        $ui_index tag remove in_sel 0.0 end
        $ui_workdir tag remove in_sel 0.0 end

        if {$col == 0} {
                if {$current_diff_path eq $path} {
                        set after {reshow_diff;}
                } else {
                        set after {}
                }
                if {$w eq $ui_index} {
                        update_indexinfo \
                                "Unstaging [short_path $path] from commit" \
                                [list $path] \
                                [concat $after {set ui_status_value {Ready.}}]
                } elseif {$w eq $ui_workdir} {
                        update_index \
                                "Adding [short_path $path]" \
                                [list $path] \
                                [concat $after {set ui_status_value {Ready.}}]
                }
        } else {
                show_diff $path $w $lno
        }
}

proc add_one_to_selection {w x y} {
        global file_lists last_clicked selected_paths

        set lno [lindex [split [$w index @$x,$y] .] 0]
        set path [lindex $file_lists($w) [expr {$lno - 1}]]
        if {$path eq {}} {
                set last_clicked {}
                return
        }

        if {$last_clicked ne {}
                && [lindex $last_clicked 0] ne $w} {
                array unset selected_paths
                [lindex $last_clicked 0] tag remove in_sel 0.0 end
        }

        set last_clicked [list $w $lno]
        if {[catch {set in_sel $selected_paths($path)}]} {
                set in_sel 0
        }
        if {$in_sel} {
                unset selected_paths($path)
                $w tag remove in_sel $lno.0 [expr {$lno + 1}].0
        } else {
                set selected_paths($path) 1
                $w tag add in_sel $lno.0 [expr {$lno + 1}].0
        }
}

proc add_range_to_selection {w x y} {
        global file_lists last_clicked selected_paths

        if {[lindex $last_clicked 0] ne $w} {
                toggle_or_diff $w $x $y
                return
        }

        set lno [lindex [split [$w index @$x,$y] .] 0]
        set lc [lindex $last_clicked 1]
        if {$lc < $lno} {
                set begin $lc
                set end $lno
        } else {
                set begin $lno
                set end $lc
        }

        foreach path [lrange $file_lists($w) \
                [expr {$begin - 1}] \
                [expr {$end - 1}]] {
                set selected_paths($path) 1
        }
        $w tag add in_sel $begin.0 [expr {$end + 1}].0
}

######################################################################
##
## config defaults

set cursor_ptr arrow
font create font_diff -family Courier -size 10
font create font_ui
catch {
        label .dummy
        eval font configure font_ui [font actual [.dummy cget -font]]
        destroy .dummy
}

font create font_uibold
font create font_diffbold

if {[is_Windows]} {
        set M1B Control
        set M1T Ctrl
} elseif {[is_MacOSX]} {
        set M1B M1
        set M1T Cmd
} else {
        set M1B M1
        set M1T M1
}

proc apply_config {} {
        global repo_config font_descs

        foreach option $font_descs {
                set name [lindex $option 0]
                set font [lindex $option 1]
                if {[catch {
                        foreach {cn cv} $repo_config(gui.$name) {
                                font configure $font $cn $cv
                        }
                        } err]} {
                        error_popup "Invalid font specified in gui.$name:\n\n$err"
                }
                foreach {cn cv} [font configure $font] {
                        font configure ${font}bold $cn $cv
                }
                font configure ${font}bold -weight bold
        }
}

set default_config(gui.trustmtime) false
set default_config(gui.pullsummary) true
set default_config(gui.diffcontext) 5
set default_config(gui.newbranchtemplate) {}
set default_config(gui.fontui) [font configure font_ui]
set default_config(gui.fontdiff) [font configure font_diff]
set font_descs {
        {fontui   font_ui   {Main Font}}
        {fontdiff font_diff {Diff/Console Font}}
}
load_config 0
apply_config

######################################################################
##
## ui construction

# -- Menu Bar
#
menu .mbar -tearoff 0
.mbar add cascade -label Repository -menu .mbar.repository
.mbar add cascade -label Edit -menu .mbar.edit
if {!$single_commit} {
        .mbar add cascade -label Branch -menu .mbar.branch
}
.mbar add cascade -label Commit -menu .mbar.commit
if {!$single_commit} {
        .mbar add cascade -label Fetch -menu .mbar.fetch
        .mbar add cascade -label Pull -menu .mbar.pull
        .mbar add cascade -label Push -menu .mbar.push
}
. configure -menu .mbar

# -- Repository Menu
#
menu .mbar.repository
.mbar.repository add command \
        -label {Visualize Current Branch} \
        -command {do_gitk {}} \
        -font font_ui
if {![is_MacOSX]} {
        .mbar.repository add command \
                -label {Visualize All Branches} \
                -command {do_gitk {--all}} \
                -font font_ui
}
.mbar.repository add separator

if {!$single_commit} {
        .mbar.repository add command -label {Compress Database} \
                -command do_gc \
                -font font_ui

        .mbar.repository add command -label {Verify Database} \
                -command do_fsck_objects \
                -font font_ui

        .mbar.repository add separator

        if {[is_Windows]} {
                .mbar.repository add command \
                        -label {Create Desktop Icon} \
                        -command do_windows_shortcut \
                        -font font_ui
        } elseif {[is_MacOSX]} {
                .mbar.repository add command \
                        -label {Create Desktop Icon} \
                        -command do_macosx_app \
                        -font font_ui
        }
}

.mbar.repository add command -label Quit \
        -command do_quit \
        -accelerator $M1T-Q \
        -font font_ui

# -- Edit Menu
#
menu .mbar.edit
.mbar.edit add command -label Undo \
        -command {catch {[focus] edit undo}} \
        -accelerator $M1T-Z \
        -font font_ui
.mbar.edit add command -label Redo \
        -command {catch {[focus] edit redo}} \
        -accelerator $M1T-Y \
        -font font_ui
.mbar.edit add separator
.mbar.edit add command -label Cut \
        -command {catch {tk_textCut [focus]}} \
        -accelerator $M1T-X \
        -font font_ui
.mbar.edit add command -label Copy \
        -command {catch {tk_textCopy [focus]}} \
        -accelerator $M1T-C \
        -font font_ui
.mbar.edit add command -label Paste \
        -command {catch {tk_textPaste [focus]; [focus] see insert}} \
        -accelerator $M1T-V \
        -font font_ui
.mbar.edit add command -label Delete \
        -command {catch {[focus] delete sel.first sel.last}} \
        -accelerator Del \
        -font font_ui
.mbar.edit add separator
.mbar.edit add command -label {Select All} \
        -command {catch {[focus] tag add sel 0.0 end}} \
        -accelerator $M1T-A \
        -font font_ui

# -- Branch Menu
#
if {!$single_commit} {
        menu .mbar.branch

        .mbar.branch add command -label {Create...} \
                -command do_create_branch \
                -accelerator $M1T-N \
                -font font_ui
        lappend disable_on_lock [list .mbar.branch entryconf \
                [.mbar.branch index last] -state]

        .mbar.branch add command -label {Delete...} \
                -command do_delete_branch \
                -font font_ui
        lappend disable_on_lock [list .mbar.branch entryconf \
                [.mbar.branch index last] -state]
}

# -- Commit Menu
#
menu .mbar.commit

.mbar.commit add radiobutton \
        -label {New Commit} \
        -command do_select_commit_type \
        -variable selected_commit_type \
        -value new \
        -font font_ui
lappend disable_on_lock \
        [list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add radiobutton \
        -label {Amend Last Commit} \
        -command do_select_commit_type \
        -variable selected_commit_type \
        -value amend \
        -font font_ui
lappend disable_on_lock \
        [list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add separator

.mbar.commit add command -label Rescan \
        -command do_rescan \
        -accelerator F5 \
        -font font_ui
lappend disable_on_lock \
        [list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add command -label {Add To Commit} \
        -command do_add_selection \
        -font font_ui
lappend disable_on_lock \
        [list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add command -label {Add All To Commit} \
        -command do_add_all \
        -accelerator $M1T-I \
        -font font_ui
lappend disable_on_lock \
        [list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add command -label {Unstage From Commit} \
        -command do_unstage_selection \
        -font font_ui
lappend disable_on_lock \
        [list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add command -label {Revert Changes} \
        -command do_revert_selection \
        -font font_ui
lappend disable_on_lock \
        [list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add separator

.mbar.commit add command -label {Sign Off} \
        -command do_signoff \
        -accelerator $M1T-S \
        -font font_ui

.mbar.commit add command -label Commit \
        -command do_commit \
        -accelerator $M1T-Return \
        -font font_ui
lappend disable_on_lock \
        [list .mbar.commit entryconf [.mbar.commit index last] -state]

# -- Transport menus
#
if {!$single_commit} {
        menu .mbar.fetch
        menu .mbar.pull
        menu .mbar.push
}

if {[is_MacOSX]} {
        # -- Apple Menu (Mac OS X only)
        #
        .mbar add cascade -label Apple -menu .mbar.apple
        menu .mbar.apple

        .mbar.apple add command -label "About [appname]" \
                -command do_about \
                -font font_ui
        .mbar.apple add command -label "[appname] Options..." \
                -command do_options \
                -font font_ui
} else {
        # -- Edit Menu
        #
        .mbar.edit add separator
        .mbar.edit add command -label {Options...} \
                -command do_options \
                -font font_ui

        # -- Tools Menu
        #
        if {[file exists /usr/local/miga/lib/gui-miga]
                && [file exists .pvcsrc]} {
        proc do_miga {} {
                global ui_status_value
                if {![lock_index update]} return
                set cmd [list sh --login -c "/usr/local/miga/lib/gui-miga \"[pwd]\""]
                set miga_fd [open "|$cmd" r]
                fconfigure $miga_fd -blocking 0
                fileevent $miga_fd readable [list miga_done $miga_fd]
                set ui_status_value {Running miga...}
        }
        proc miga_done {fd} {
                read $fd 512
                if {[eof $fd]} {
                        close $fd
                        unlock_index
                        rescan [list set ui_status_value {Ready.}]
                }
        }
        .mbar add cascade -label Tools -menu .mbar.tools
        menu .mbar.tools
        .mbar.tools add command -label "Migrate" \
                -command do_miga \
                -font font_ui
        lappend disable_on_lock \
                [list .mbar.tools entryconf [.mbar.tools index last] -state]
        }

        # -- Help Menu
        #
        .mbar add cascade -label Help -menu .mbar.help
        menu .mbar.help

        .mbar.help add command -label "About [appname]" \
                -command do_about \
                -font font_ui
}


# -- Branch Control
#
frame .branch \
        -borderwidth 1 \
        -relief sunken
label .branch.l1 \
        -text {Current Branch:} \
        -anchor w \
        -justify left \
        -font font_ui
label .branch.cb \
        -textvariable current_branch \
        -anchor w \
        -justify left \
        -font font_ui
pack .branch.l1 -side left
pack .branch.cb -side left -fill x
pack .branch -side top -fill x

# -- Main Window Layout
#
panedwindow .vpane -orient vertical
panedwindow .vpane.files -orient horizontal
.vpane add .vpane.files -sticky nsew -height 100 -width 200
pack .vpane -anchor n -side top -fill both -expand 1

# -- Index File List
#
frame .vpane.files.index -height 100 -width 200
label .vpane.files.index.title -text {Changes To Be Committed} \
        -background green \
        -font font_ui
text $ui_index -background white -borderwidth 0 \
        -width 20 -height 10 \
        -wrap none \
        -font font_ui \
        -cursor $cursor_ptr \
        -xscrollcommand {.vpane.files.index.sx set} \
        -yscrollcommand {.vpane.files.index.sy set} \
        -state disabled
scrollbar .vpane.files.index.sx -orient h -command [list $ui_index xview]
scrollbar .vpane.files.index.sy -orient v -command [list $ui_index yview]
pack .vpane.files.index.title -side top -fill x
pack .vpane.files.index.sx -side bottom -fill x
pack .vpane.files.index.sy -side right -fill y
pack $ui_index -side left -fill both -expand 1
.vpane.files add .vpane.files.index -sticky nsew

# -- Working Directory File List
#
frame .vpane.files.workdir -height 100 -width 200
label .vpane.files.workdir.title -text {Changed But Not Updated} \
        -background red \
        -font font_ui
text $ui_workdir -background white -borderwidth 0 \
        -width 20 -height 10 \
        -wrap none \
        -font font_ui \
        -cursor $cursor_ptr \
        -xscrollcommand {.vpane.files.workdir.sx set} \
        -yscrollcommand {.vpane.files.workdir.sy set} \
        -state disabled
scrollbar .vpane.files.workdir.sx -orient h -command [list $ui_workdir xview]
scrollbar .vpane.files.workdir.sy -orient v -command [list $ui_workdir yview]
pack .vpane.files.workdir.title -side top -fill x
pack .vpane.files.workdir.sx -side bottom -fill x
pack .vpane.files.workdir.sy -side right -fill y
pack $ui_workdir -side left -fill both -expand 1
.vpane.files add .vpane.files.workdir -sticky nsew

foreach i [list $ui_index $ui_workdir] {
        $i tag conf in_diff -font font_uibold
        $i tag conf in_sel \
                -background [$i cget -foreground] \
                -foreground [$i cget -background]
}
unset i

# -- Diff and Commit Area
#
frame .vpane.lower -height 300 -width 400
frame .vpane.lower.commarea
frame .vpane.lower.diff -relief sunken -borderwidth 1
pack .vpane.lower.commarea -side top -fill x
pack .vpane.lower.diff -side bottom -fill both -expand 1
.vpane add .vpane.lower -stick nsew

# -- Commit Area Buttons
#
frame .vpane.lower.commarea.buttons
label .vpane.lower.commarea.buttons.l -text {} \
        -anchor w \
        -justify left \
        -font font_ui
pack .vpane.lower.commarea.buttons.l -side top -fill x
pack .vpane.lower.commarea.buttons -side left -fill y

button .vpane.lower.commarea.buttons.rescan -text {Rescan} \
        -command do_rescan \
        -font font_ui
pack .vpane.lower.commarea.buttons.rescan -side top -fill x
lappend disable_on_lock \
        {.vpane.lower.commarea.buttons.rescan conf -state}

button .vpane.lower.commarea.buttons.incall -text {Add All} \
        -command do_add_all \
        -font font_ui
pack .vpane.lower.commarea.buttons.incall -side top -fill x
lappend disable_on_lock \
        {.vpane.lower.commarea.buttons.incall conf -state}

button .vpane.lower.commarea.buttons.signoff -text {Sign Off} \
        -command do_signoff \
        -font font_ui
pack .vpane.lower.commarea.buttons.signoff -side top -fill x

button .vpane.lower.commarea.buttons.commit -text {Commit} \
        -command do_commit \
        -font font_ui
pack .vpane.lower.commarea.buttons.commit -side top -fill x
lappend disable_on_lock \
        {.vpane.lower.commarea.buttons.commit conf -state}

# -- Commit Message Buffer
#
frame .vpane.lower.commarea.buffer
frame .vpane.lower.commarea.buffer.header
set ui_comm .vpane.lower.commarea.buffer.t
set ui_coml .vpane.lower.commarea.buffer.header.l
radiobutton .vpane.lower.commarea.buffer.header.new \
        -text {New Commit} \
        -command do_select_commit_type \
        -variable selected_commit_type \
        -value new \
        -font font_ui
lappend disable_on_lock \
        [list .vpane.lower.commarea.buffer.header.new conf -state]
radiobutton .vpane.lower.commarea.buffer.header.amend \
        -text {Amend Last Commit} \
        -command do_select_commit_type \
        -variable selected_commit_type \
        -value amend \
        -font font_ui
lappend disable_on_lock \
        [list .vpane.lower.commarea.buffer.header.amend conf -state]
label $ui_coml \
        -anchor w \
        -justify left \
        -font font_ui
proc trace_commit_type {varname args} {
        global ui_coml commit_type
        switch -glob -- $commit_type {
        initial       {set txt {Initial Commit Message:}}
        amend         {set txt {Amended Commit Message:}}
        amend-initial {set txt {Amended Initial Commit Message:}}
        amend-merge   {set txt {Amended Merge Commit Message:}}
        merge         {set txt {Merge Commit Message:}}
        *             {set txt {Commit Message:}}
        }
        $ui_coml conf -text $txt
}
trace add variable commit_type write trace_commit_type
pack $ui_coml -side left -fill x
pack .vpane.lower.commarea.buffer.header.amend -side right
pack .vpane.lower.commarea.buffer.header.new -side right

text $ui_comm -background white -borderwidth 1 \
        -undo true \
        -maxundo 20 \
        -autoseparators true \
        -relief sunken \
        -width 75 -height 9 -wrap none \
        -font font_diff \
        -yscrollcommand {.vpane.lower.commarea.buffer.sby set}
scrollbar .vpane.lower.commarea.buffer.sby \
        -command [list $ui_comm yview]
pack .vpane.lower.commarea.buffer.header -side top -fill x
pack .vpane.lower.commarea.buffer.sby -side right -fill y
pack $ui_comm -side left -fill y
pack .vpane.lower.commarea.buffer -side left -fill y

# -- Commit Message Buffer Context Menu
#
set ctxm .vpane.lower.commarea.buffer.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
        -label {Cut} \
        -font font_ui \
        -command {tk_textCut $ui_comm}
$ctxm add command \
        -label {Copy} \
        -font font_ui \
        -command {tk_textCopy $ui_comm}
$ctxm add command \
        -label {Paste} \
        -font font_ui \
        -command {tk_textPaste $ui_comm}
$ctxm add command \
        -label {Delete} \
        -font font_ui \
        -command {$ui_comm delete sel.first sel.last}
$ctxm add separator
$ctxm add command \
        -label {Select All} \
        -font font_ui \
        -command {focus $ui_comm;$ui_comm tag add sel 0.0 end}
$ctxm add command \
        -label {Copy All} \
        -font font_ui \
        -command {
                $ui_comm tag add sel 0.0 end
                tk_textCopy $ui_comm
                $ui_comm tag remove sel 0.0 end
        }
$ctxm add separator
$ctxm add command \
        -label {Sign Off} \
        -font font_ui \
        -command do_signoff
bind_button3 $ui_comm "tk_popup $ctxm %X %Y"

# -- Diff Header
#
set current_diff_path {}
set diff_actions [list]
proc trace_current_diff_path {varname args} {
        global current_diff_path diff_actions file_states
        if {$current_diff_path eq {}} {
                set s {}
                set f {}
                set p {}
                set o disabled
        } else {
                set p $current_diff_path
                set s [mapdesc [lindex $file_states($p) 0] $p]
                set f {File:}
                set p [escape_path $p]
                set o normal
        }

        .vpane.lower.diff.header.status configure -text $s
        .vpane.lower.diff.header.file configure -text $f
        .vpane.lower.diff.header.path configure -text $p
        foreach w $diff_actions {
                uplevel #0 $w $o
        }
}
trace add variable current_diff_path write trace_current_diff_path

frame .vpane.lower.diff.header -background orange
label .vpane.lower.diff.header.status \
        -background orange \
        -width $max_status_desc \
        -anchor w \
        -justify left \
        -font font_ui
label .vpane.lower.diff.header.file \
        -background orange \
        -anchor w \
        -justify left \
        -font font_ui
label .vpane.lower.diff.header.path \
        -background orange \
        -anchor w \
        -justify left \
        -font font_ui
pack .vpane.lower.diff.header.status -side left
pack .vpane.lower.diff.header.file -side left
pack .vpane.lower.diff.header.path -fill x
set ctxm .vpane.lower.diff.header.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
        -label {Copy} \
        -font font_ui \
        -command {
                clipboard clear
                clipboard append \
                        -format STRING \
                        -type STRING \
                        -- $current_diff_path
        }
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
bind_button3 .vpane.lower.diff.header.path "tk_popup $ctxm %X %Y"

# -- Diff Body
#
frame .vpane.lower.diff.body
set ui_diff .vpane.lower.diff.body.t
text $ui_diff -background white -borderwidth 0 \
        -width 80 -height 15 -wrap none \
        -font font_diff \
        -xscrollcommand {.vpane.lower.diff.body.sbx set} \
        -yscrollcommand {.vpane.lower.diff.body.sby set} \
        -state disabled
scrollbar .vpane.lower.diff.body.sbx -orient horizontal \
        -command [list $ui_diff xview]
scrollbar .vpane.lower.diff.body.sby -orient vertical \
        -command [list $ui_diff yview]
pack .vpane.lower.diff.body.sbx -side bottom -fill x
pack .vpane.lower.diff.body.sby -side right -fill y
pack $ui_diff -side left -fill both -expand 1
pack .vpane.lower.diff.header -side top -fill x
pack .vpane.lower.diff.body -side bottom -fill both -expand 1

$ui_diff tag conf d_@ -foreground blue -font font_diffbold
$ui_diff tag conf d_+ -foreground {#00a000}
$ui_diff tag conf d_- -foreground red

$ui_diff tag conf d_++ -foreground {#00a000}
$ui_diff tag conf d_-- -foreground red
$ui_diff tag conf d_+s \
        -foreground {#00a000} \
        -background {#e2effa}
$ui_diff tag conf d_-s \
        -foreground red \
        -background {#e2effa}
$ui_diff tag conf d_s+ \
        -foreground {#00a000} \
        -background ivory1
$ui_diff tag conf d_s- \
        -foreground red \
        -background ivory1

$ui_diff tag conf d<<<<<<< \
        -foreground orange \
        -font font_diffbold
$ui_diff tag conf d======= \
        -foreground orange \
        -font font_diffbold
$ui_diff tag conf d>>>>>>> \
        -foreground orange \
        -font font_diffbold

$ui_diff tag raise sel

# -- Diff Body Context Menu
#
set ctxm .vpane.lower.diff.body.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
        -label {Refresh} \
        -font font_ui \
        -command reshow_diff
$ctxm add command \
        -label {Copy} \
        -font font_ui \
        -command {tk_textCopy $ui_diff}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add command \
        -label {Select All} \
        -font font_ui \
        -command {focus $ui_diff;$ui_diff tag add sel 0.0 end}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add command \
        -label {Copy All} \
        -font font_ui \
        -command {
                $ui_diff tag add sel 0.0 end
                tk_textCopy $ui_diff
                $ui_diff tag remove sel 0.0 end
        }
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add separator
$ctxm add command \
        -label {Decrease Font Size} \
        -font font_ui \
        -command {incr_font_size font_diff -1}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add command \
        -label {Increase Font Size} \
        -font font_ui \
        -command {incr_font_size font_diff 1}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add separator
$ctxm add command \
        -label {Show Less Context} \
        -font font_ui \
        -command {if {$repo_config(gui.diffcontext) >= 2} {
                incr repo_config(gui.diffcontext) -1
                reshow_diff
        }}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add command \
        -label {Show More Context} \
        -font font_ui \
        -command {
                incr repo_config(gui.diffcontext)
                reshow_diff
        }
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add separator
$ctxm add command -label {Options...} \
        -font font_ui \
        -command do_options
bind_button3 $ui_diff "tk_popup $ctxm %X %Y"

# -- Status Bar
#
set ui_status_value {Initializing...}
label .status -textvariable ui_status_value \
        -anchor w \
        -justify left \
        -borderwidth 1 \
        -relief sunken \
        -font font_ui
pack .status -anchor w -side bottom -fill x

# -- Load geometry
#
catch {
set gm $repo_config(gui.geometry)
wm geometry . [lindex $gm 0]
.vpane sash place 0 \
        [lindex [.vpane sash coord 0] 0] \
        [lindex $gm 1]
.vpane.files sash place 0 \
        [lindex $gm 2] \
        [lindex [.vpane.files sash coord 0] 1]
unset gm
}

# -- Key Bindings
#
bind $ui_comm <$M1B-Key-Return> {do_commit;break}
bind $ui_comm <$M1B-Key-i> {do_add_all;break}
bind $ui_comm <$M1B-Key-I> {do_add_all;break}
bind $ui_comm <$M1B-Key-x> {tk_textCut %W;break}
bind $ui_comm <$M1B-Key-X> {tk_textCut %W;break}
bind $ui_comm <$M1B-Key-c> {tk_textCopy %W;break}
bind $ui_comm <$M1B-Key-C> {tk_textCopy %W;break}
bind $ui_comm <$M1B-Key-v> {tk_textPaste %W; %W see insert; break}
bind $ui_comm <$M1B-Key-V> {tk_textPaste %W; %W see insert; break}
bind $ui_comm <$M1B-Key-a> {%W tag add sel 0.0 end;break}
bind $ui_comm <$M1B-Key-A> {%W tag add sel 0.0 end;break}

bind $ui_diff <$M1B-Key-x> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-X> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-c> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-C> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-v> {break}
bind $ui_diff <$M1B-Key-V> {break}
bind $ui_diff <$M1B-Key-a> {%W tag add sel 0.0 end;break}
bind $ui_diff <$M1B-Key-A> {%W tag add sel 0.0 end;break}
bind $ui_diff <Key-Up>     {catch {%W yview scroll -1 units};break}
bind $ui_diff <Key-Down>   {catch {%W yview scroll  1 units};break}
bind $ui_diff <Key-Left>   {catch {%W xview scroll -1 units};break}
bind $ui_diff <Key-Right>  {catch {%W xview scroll  1 units};break}

if {!$single_commit} {
        bind . <$M1B-Key-n> do_create_branch
        bind . <$M1B-Key-N> do_create_branch
}

bind .   <Destroy> do_quit
bind all <Key-F5> do_rescan
bind all <$M1B-Key-r> do_rescan
bind all <$M1B-Key-R> do_rescan
bind .   <$M1B-Key-s> do_signoff
bind .   <$M1B-Key-S> do_signoff
bind .   <$M1B-Key-i> do_add_all
bind .   <$M1B-Key-I> do_add_all
bind .   <$M1B-Key-Return> do_commit
bind all <$M1B-Key-q> do_quit
bind all <$M1B-Key-Q> do_quit
bind all <$M1B-Key-w> {destroy [winfo toplevel %W]}
bind all <$M1B-Key-W> {destroy [winfo toplevel %W]}
foreach i [list $ui_index $ui_workdir] {
        bind $i <Button-1>       "toggle_or_diff         $i %x %y; break"
        bind $i <$M1B-Button-1>  "add_one_to_selection   $i %x %y; break"
        bind $i <Shift-Button-1> "add_range_to_selection $i %x %y; break"
}
unset i

set file_lists($ui_index) [list]
set file_lists($ui_workdir) [list]

set HEAD {}
set PARENT {}
set MERGE_HEAD [list]
set commit_type {}
set empty_tree {}
set current_branch {}
set current_diff_path {}
set selected_commit_type new

wm title . "[appname] ([file normalize [file dirname [gitdir]]])"
focus -force $ui_comm

# -- Warn the user about environmental problems.  Cygwin's Tcl
#    does *not* pass its env array onto any processes it spawns.
#    This means that git processes get none of our environment.
#
if {[is_Windows]} {
        set ignored_env 0
        set suggest_user {}
        set msg "Possible environment issues exist.

The following environment variables are probably
going to be ignored by any Git subprocess run
by [appname]:

"
        foreach name [array names env] {
                switch -regexp -- $name {
                {^GIT_INDEX_FILE$} -
                {^GIT_OBJECT_DIRECTORY$} -
                {^GIT_ALTERNATE_OBJECT_DIRECTORIES$} -
                {^GIT_DIFF_OPTS$} -
                {^GIT_EXTERNAL_DIFF$} -
                {^GIT_PAGER$} -
                {^GIT_TRACE$} -
                {^GIT_CONFIG$} -
                {^GIT_CONFIG_LOCAL$} -
                {^GIT_(AUTHOR|COMMITTER)_DATE$} {
                        append msg " - $name\n"
                        incr ignored_env
                }
                {^GIT_(AUTHOR|COMMITTER)_(NAME|EMAIL)$} {
                        append msg " - $name\n"
                        incr ignored_env
                        set suggest_user $name
                }
                }
        }
        if {$ignored_env > 0} {
                append msg "
This is due to a known issue with the
Tcl binary distributed by Cygwin."

                if {$suggest_user ne {}} {
                        append msg "

A good replacement for $suggest_user
is placing values for the user.name and
user.email settings into your personal
~/.gitconfig file.
"
                }
                warn_popup $msg
        }
        unset ignored_env msg suggest_user name
}

# -- Only initialize complex UI if we are going to stay running.
#
if {!$single_commit} {
        load_all_remotes
        load_all_heads

        populate_branch_menu
        populate_fetch_menu .mbar.fetch
        populate_pull_menu .mbar.pull
        populate_push_menu .mbar.push
}

# -- Only suggest a gc run if we are going to stay running.
#
if {!$single_commit} {
        set object_limit 2000
        if {[is_Windows]} {set object_limit 200}
        regexp {^([0-9]+) objects,} [exec git count-objects] _junk objects_current
        if {$objects_current >= $object_limit} {
                if {[ask_popup \
                        "This repository currently has $objects_current loose objects.

To maintain optimal performance it is strongly
recommended that you compress the database
when more than $object_limit loose objects exist.

Compress the database now?"] eq yes} {
                        do_gc
                }
        }
        unset object_limit _junk objects_current
}

lock_index begin-read
after 1 do_rescan