git-gui: Convert merge dialog to use class system

[alt-git.git] / lib / choose_rev.tcl

# git-gui revision chooser
# Copyright (C) 2006, 2007 Shawn Pearce

class choose_rev {

image create photo ::choose_rev::img_find -data {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}

field w               ; # our megawidget path
field w_list          ; # list of currently filtered specs
field w_filter        ; # filter entry for $w_list

field c_expr        {}; # current revision expression
field filter          ; # current filter string
field revtype     head; # type of revision chosen
field cur_specs [list]; # list of specs for $revtype
field spec_head       ; # list of all head specs
field spec_trck       ; # list of all tracking branch specs
field spec_tag        ; # list of all tag specs

constructor new {path {title {}}} {
        global current_branch is_detached

        set w $path

        if {$title ne {}} {
                labelframe $w -text $title
        } else {
                frame $w
        }
        bind $w <Destroy> [cb _delete %W]

        if {$is_detached} {
                radiobutton $w.detachedhead_r \
                        -anchor w \
                        -text {This Detached Checkout} \
                        -value HEAD \
                        -variable @revtype
                grid $w.detachedhead_r -sticky we -padx {0 5} -columnspan 2
        }

        radiobutton $w.expr_r \
                -text {Revision Expression:} \
                -value expr \
                -variable @revtype
        entry $w.expr_t \
                -borderwidth 1 \
                -relief sunken \
                -width 50 \
                -textvariable @c_expr \
                -validate key \
                -validatecommand [cb _validate %d %S]
        grid $w.expr_r $w.expr_t -sticky we -padx {0 5}

        frame $w.types
        radiobutton $w.types.head_r \
                -text {Local Branch} \
                -value head \
                -variable @revtype
        pack $w.types.head_r -side left
        radiobutton $w.types.trck_r \
                -text {Tracking Branch} \
                -value trck \
                -variable @revtype
        pack $w.types.trck_r -side left
        radiobutton $w.types.tag_r \
                -text {Tag} \
                -value tag \
                -variable @revtype
        pack $w.types.tag_r -side left
        set w_filter $w.types.filter
        entry $w_filter \
                -borderwidth 1 \
                -relief sunken \
                -width 12 \
                -textvariable @filter \
                -validate key \
                -validatecommand [cb _filter %P]
        pack $w_filter -side right
        pack [label $w.types.filter_icon \
                -image ::choose_rev::img_find \
                ] -side right
        grid $w.types -sticky we -padx {0 5} -columnspan 2

        frame $w.list
        set w_list $w.list.l
        listbox $w_list \
                -font font_diff \
                -width 50 \
                -height 10 \
                -selectmode browse \
                -exportselection false \
                -xscrollcommand [cb _sb_set $w.list.sbx h] \
                -yscrollcommand [cb _sb_set $w.list.sby v]
        pack $w_list -fill both -expand 1
        grid $w.list -sticky nswe -padx {20 5} -columnspan 2

        grid columnconfigure $w 1 -weight 1
        if {$is_detached} {
                grid rowconfigure $w 3 -weight 1
        } else {
                grid rowconfigure $w 2 -weight 1
        }

        trace add variable @revtype write [cb _select]
        bind $w_filter <Key-Return> [list focus $w_list]\;break
        bind $w_filter <Key-Down>   [list focus $w_list]

        set spec_head [list]
        foreach name [load_all_heads] {
                lappend spec_head [list $name refs/heads/$name]
        }

        set spec_trck [list]
        foreach spec [all_tracking_branches] {
                set name [lindex $spec 0]
                regsub ^refs/(heads|remotes)/ $name {} name
                lappend spec_trck [concat $name $spec]
        }

        set spec_tag [list]
        foreach name [load_all_tags] {
                lappend spec_tag [list $name refs/tags/$name]
        }

                  if {$is_detached}             { set revtype HEAD
        } elseif {[llength $spec_head] > 0} { set revtype head
        } elseif {[llength $spec_trck] > 0} { set revtype trck
        } elseif {[llength $spec_tag ] > 0} { set revtype tag
        } else {                              set revtype expr
        }

        if {$revtype eq {head} && $current_branch ne {}} {
                set i 0
                foreach spec $spec_head {
                        if {[lindex $spec 0] eq $current_branch} {
                                $w_list selection clear 0 end
                                $w_list selection set $i
                                break
                        }
                        incr i
                }
        }

        return $this
}

method none {text} {
        if {![winfo exists $w.none_r]} {
                radiobutton $w.none_r \
                        -anchor w \
                        -value none \
                        -variable @revtype
                grid $w.none_r -sticky we -padx {0 5} -columnspan 2
        }
        $w.none_r configure -text $text
}

method get {} {
        switch -- $revtype {
        head -
        trck -
        tag  {
                set i [$w_list curselection]
                if {$i ne {}} {
                        return [lindex $cur_specs $i 0]
                } else {
                        return {}
                }
        }

        HEAD { return HEAD                     }
        expr { return $c_expr                  }
        none { return {}                       }
        default { error "unknown type of revision" }
        }
}

method pick_tracking_branch {} {
        set revtype trck
}

method focus_filter {} {
        if {[$w_filter cget -state] eq {normal}} {
                focus $w_filter
        }
}

method bind_listbox {event script}  {
        bind $w_list $event $script
}

method get_local_branch {} {
        if {$revtype eq {head}} {
                return [_expr $this]
        } else {
                return {}
        }
}

method get_tracking_branch {} {
        set i [$w_list curselection]
        if {$i eq {} || $revtype ne {trck}} {
                return {}
        }
        return [lrange [lindex $cur_specs $i] 1 end]
}

method get_commit {} {
        set e [_expr $this]
        if {$e eq {}} {
                return {}
        }
        return [git rev-parse --verify "$e^0"]
}

method commit_or_die {} {
        if {[catch {set new [get_commit $this]} err]} {

                # Cleanup the not-so-friendly error from rev-parse.
                #
                regsub {^fatal:\s*} $err {} err
                if {$err eq {Needed a single revision}} {
                        set err {}
                }

                set top [winfo toplevel $w]
                set msg "Invalid revision: [get $this]\n\n$err"
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $top] \
                        -parent $top \
                        -message $msg
                error $msg
        }
        return $new
}

method _expr {} {
        switch -- $revtype {
        head -
        trck -
        tag  {
                set i [$w_list curselection]
                if {$i ne {}} {
                        return [lindex $cur_specs $i 1]
                } else {
                        error "No revision selected."
                }
        }

        expr {
                if {$c_expr ne {}} {
                        return $c_expr
                } else {
                        error "Revision expression is empty."
                }
        }
        HEAD { return HEAD                     }
        none { return {}                       }
        default { error "unknown type of revision"      }
        }
}

method _validate {d S} {
        if {$d == 1} {
                if {[regexp {\s} $S]} {
                        return 0
                }
                if {[string length $S] > 0} {
                        set revtype expr
                }
        }
        return 1
}

method _filter {P} {
        if {[regexp {\s} $P]} {
                return 0
        }
        _rebuild $this $P
        return 1
}

method _select {args} {
        _rebuild $this $filter
        focus_filter $this
}

method _rebuild {pat} {
        set ste normal
        switch -- $revtype {
        head { set new $spec_head }
        trck { set new $spec_trck }
        tag  { set new $spec_tag  }
        expr -
        HEAD -
        none {
                set new [list]
                set ste disabled
        }
        }

        if {[$w_list cget -state] eq {disabled}} {
                $w_list configure -state normal
        }
        $w_list delete 0 end

        if {$pat ne {}} {
                set pat *${pat}*
        }
        set cur_specs [list]
        foreach spec $new {
                set txt [lindex $spec 0]
                if {$pat eq {} || [string match $pat $txt]} {
                        lappend cur_specs $spec
                        $w_list insert end $txt
                }
        }
        if {$cur_specs ne {}} {
                $w_list selection clear 0 end
                $w_list selection set 0
        }

        if {[$w_filter cget -state] ne $ste} {
                $w_list   configure -state $ste
                $w_filter configure -state $ste
        }
}

method _delete {current} {
        if {$current eq $w} {
                delete_this
        }
}

method _sb_set {sb orient first last} {
        set old_focus [focus -lastfor $w]

        if {$first == 0 && $last == 1} {
                if {[winfo exists $sb]} {
                        destroy $sb
                        if {$old_focus ne {}} {
                                update
                                focus $old_focus
                        }
                }
                return
        }

        if {![winfo exists $sb]} {
                if {$orient eq {h}} {
                        scrollbar $sb -orient h -command [list $w_list xview]
                        pack $sb -fill x -side bottom -before $w_list
                } else {
                        scrollbar $sb -orient v -command [list $w_list yview]
                        pack $sb -fill y -side right -before $w_list
                }
                if {$old_focus ne {}} {
                        update
                        focus $old_focus
                }
        }
        $sb set $first $last
}

}