lib/merge.tcl

   1 # git-gui branch merge support
   2 # Copyright (C) 2006, 2007 Shawn Pearce
   3
   4 class merge {
   5
   6 field w         ; # top level window
   7 field w_rev     ; # mega-widget to pick the revision to merge
   8
   9 method _can_merge {} {
  10         global HEAD commit_type file_states
  11
  12         if {[string match amend* $commit_type]} {
  13                 info_popup {Cannot merge while amending.
  14
  15 You must finish amending this commit before starting any type of merge.
  16 }
  17                 return 0
  18         }
  19
  20         if {[committer_ident] eq {}} {return 0}
  21         if {![lock_index merge]} {return 0}
  22
  23         # -- Our in memory state should match the repository.
  24         #
  25         repository_state curType curHEAD curMERGE_HEAD
  26         if {$commit_type ne $curType || $HEAD ne $curHEAD} {
  27                 info_popup {Last scanned state does not match repository state.
  28
  29 Another Git program has modified this repository since the last scan.  A rescan must be performed before a merge can be performed.
  30
  31 The rescan will be automatically started now.
  32 }
  33                 unlock_index
  34                 rescan ui_ready
  35                 return 0
  36         }
  37
  38         foreach path [array names file_states] {
  39                 switch -glob -- [lindex $file_states($path) 0] {
  40                 _O {
  41                         continue; # and pray it works!
  42                 }
  43                 U? {
  44                         error_popup "You are in the middle of a conflicted merge.
  45
  46 File [short_path $path] has merge conflicts.
  47
  48 You must resolve them, stage the file, and commit to complete the current merge.  Only then can you begin another merge.
  49 "
  50                         unlock_index
  51                         return 0
  52                 }
  53                 ?? {
  54                         error_popup "You are in the middle of a change.
  55
  56 File [short_path $path] is modified.
  57
  58 You should complete the current commit before starting a merge.  Doing so will help you abort a failed merge, should the need arise.
  59 "
  60                         unlock_index
  61                         return 0
  62                 }
  63                 }
  64         }
  65
  66         return 1
  67 }
  68
  69 method _rev {} {
  70         if {[catch {$w_rev commit_or_die}]} {
  71                 return {}
  72         }
  73         return [$w_rev get]
  74 }
  75
  76 method _visualize {} {
  77         set rev [_rev $this]
  78         if {$rev ne {}} {
  79                 do_gitk [list $rev --not HEAD]
  80         }
  81 }
  82
  83 method _start {} {
  84         global HEAD current_branch remote_url
  85
  86         set name [_rev $this]
  87         if {$name eq {}} {
  88                 return
  89         }
  90
  91         set spec [$w_rev get_tracking_branch]
  92         set cmit [$w_rev get_commit]
  93
  94         set fh [open [gitdir FETCH_HEAD] w]
  95         fconfigure $fh -translation lf
  96         if {$spec eq {}} {
  97                 set remote .
  98                 set branch $name
  99                 set stitle $branch
 100         } else {
 101                 set remote $remote_url([lindex $spec 1])
 102                 if {[regexp {^[^:@]*@[^:]*:/} $remote]} {
 103                         regsub {^[^:@]*@} $remote {} remote
 104                 }
 105                 set branch [lindex $spec 2]
 106                 set stitle "$branch of $remote"
 107         }
 108         regsub ^refs/heads/ $branch {} branch
 109         puts $fh "$cmit\t\tbranch '$branch' of $remote"
 110         close $fh
 111
 112         set cmd [list git]
 113         lappend cmd merge
 114         lappend cmd --strategy=recursive
 115         lappend cmd [git fmt-merge-msg <[gitdir FETCH_HEAD]]
 116         lappend cmd HEAD
 117         lappend cmd $cmit
 118
 119         set msg "Merging $current_branch and $stitle"
 120         ui_status "$msg..."
 121         set cons [console::new "Merge" "merge $stitle"]
 122         console::exec $cons $cmd [cb _finish $cons]
 123
 124         wm protocol $w WM_DELETE_WINDOW {}
 125         destroy $w
 126 }
 127
 128 method _finish {cons ok} {
 129         console::done $cons $ok
 130         if {$ok} {
 131                 set msg {Merge completed successfully.}
 132         } else {
 133                 set msg {Merge failed.  Conflict resolution is required.}
 134         }
 135         unlock_index
 136         rescan [list ui_status $msg]
 137         delete_this
 138 }
 139
 140 constructor dialog {} {
 141         global current_branch
 142         global M1B
 143
 144         if {![_can_merge $this]} {
 145                 delete_this
 146                 return
 147         }
 148
 149         make_toplevel top w
 150         wm title $top "[appname] ([reponame]): Merge"
 151         if {$top ne {.}} {
 152                 wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
 153         }
 154
 155         set _start [cb _start]
 156
 157         label $w.header \
 158                 -text "Merge Into $current_branch" \
 159                 -font font_uibold
 160         pack $w.header -side top -fill x
 161
 162         frame $w.buttons
 163         button $w.buttons.visualize \
 164                 -text Visualize \
 165                 -command [cb _visualize]
 166         pack $w.buttons.visualize -side left
 167         button $w.buttons.merge \
 168                 -text Merge \
 169                 -command $_start
 170         pack $w.buttons.merge -side right
 171         button $w.buttons.cancel \
 172                 -text {Cancel} \
 173                 -command [cb _cancel]
 174         pack $w.buttons.cancel -side right -padx 5
 175         pack $w.buttons -side bottom -fill x -pady 10 -padx 10
 176
 177         set w_rev [::choose_rev::new_unmerged $w.rev {Revision To Merge}]
 178         pack $w.rev -anchor nw -fill both -expand 1 -pady 5 -padx 5
 179
 180         bind $w <$M1B-Key-Return> $_start
 181         bind $w <Key-Return> $_start
 182         bind $w <Key-Escape> [cb _cancel]
 183         wm protocol $w WM_DELETE_WINDOW [cb _cancel]
 184
 185         bind $w.buttons.merge <Visibility> [cb _visible]
 186         tkwait window $w
 187 }
 188
 189 method _visible {} {
 190         grab $w
 191         if {[is_config_true gui.matchtrackingbranch]} {
 192                 $w_rev pick_tracking_branch
 193         }
 194         $w_rev focus_filter
 195 }
 196
 197 method _cancel {} {
 198         wm protocol $w WM_DELETE_WINDOW {}
 199         unlock_index
 200         destroy $w
 201         delete_this
 202 }
 203
 204 }
 205
 206 namespace eval merge {
 207
 208 proc reset_hard {} {
 209         global HEAD commit_type file_states
 210
 211         if {[string match amend* $commit_type]} {
 212                 info_popup {Cannot abort while amending.
 213
 214 You must finish amending this commit.
 215 }
 216                 return
 217         }
 218
 219         if {![lock_index abort]} return
 220
 221         if {[string match *merge* $commit_type]} {
 222                 set op_question "Abort merge?
 223
 224 Aborting the current merge will cause *ALL* uncommitted changes to be lost.
 225
 226 Continue with aborting the current merge?"
 227         } else {
 228                 set op_question "Reset changes?
 229
 230 Resetting the changes will cause *ALL* uncommitted changes to be lost.
 231
 232 Continue with resetting the current changes?"
 233         }
 234
 235         if {[ask_popup $op_question] eq {yes}} {
 236                 set fd [git_read --stderr read-tree --reset -u -v HEAD]
 237                 fconfigure $fd -blocking 0 -translation binary
 238                 fileevent $fd readable [namespace code [list _reset_wait $fd]]
 239                 $::main_status start {Aborting} {files reset}
 240         } else {
 241                 unlock_index
 242         }
 243 }
 244
 245 proc _reset_wait {fd} {
 246         global ui_comm
 247
 248         $::main_status update_meter [read $fd]
 249
 250         fconfigure $fd -blocking 1
 251         if {[eof $fd]} {
 252                 set fail [catch {close $fd} err]
 253                 $::main_status stop
 254                 unlock_index
 255
 256                 $ui_comm delete 0.0 end
 257                 $ui_comm edit modified false
 258
 259                 catch {file delete [gitdir MERGE_HEAD]}
 260                 catch {file delete [gitdir rr-cache MERGE_RR]}
 261                 catch {file delete [gitdir SQUASH_MSG]}
 262                 catch {file delete [gitdir MERGE_MSG]}
 263                 catch {file delete [gitdir GITGUI_MSG]}
 264
 265                 if {$fail} {
 266                         warn_popup "Abort failed.\n\n$err"
 267                 }
 268                 rescan {ui_status {Abort completed.  Ready.}}
 269         } else {
 270                 fconfigure $fd -blocking 0
 271         }
 272 }
 273
 274 }