git-gui/lib/mergetool.tcl

   1 # git-gui merge conflict resolution
   2 # parts based on git-mergetool (c) 2006 Theodore Y. Ts'o
   3
   4 proc merge_resolve_one {stage} {
   5         global current_diff_path
   6
   7         switch -- $stage {
   8                 1 { set target [mc "the base version"] }
   9                 2 { set target [mc "this branch"] }
  10                 3 { set target [mc "the other branch"] }
  11         }
  12
  13         set op_question [mc "Force resolution to %s?
  14 Note that the diff shows only conflicting changes.
  15
  16 %s will be overwritten.
  17
  18 This operation can be undone only by restarting the merge." \
  19                 $target [short_path $current_diff_path]]
  20
  21         if {[ask_popup $op_question] eq {yes}} {
  22                 merge_load_stages $current_diff_path [list merge_force_stage $stage]
  23         }
  24 }
  25
  26 proc merge_add_resolution {path} {
  27         global current_diff_path ui_workdir
  28
  29         set after [next_diff_after_action $ui_workdir $path {} {^_?U}]
  30
  31         update_index \
  32                 [mc "Adding resolution for %s" [short_path $path]] \
  33                 [list $path] \
  34                 [concat $after [list ui_ready]]
  35 }
  36
  37 proc merge_force_stage {stage} {
  38         global current_diff_path merge_stages
  39
  40         if {$merge_stages($stage) ne {}} {
  41                 git checkout-index -f --stage=$stage -- $current_diff_path
  42         } else {
  43                 file delete -- $current_diff_path
  44         }
  45
  46         merge_add_resolution $current_diff_path
  47 }
  48
  49 proc merge_load_stages {path cont} {
  50         global merge_stages_fd merge_stages merge_stages_buf
  51
  52         if {[info exists merge_stages_fd]} {
  53                 catch { kill_file_process $merge_stages_fd }
  54                 catch { close $merge_stages_fd }
  55         }
  56
  57         set merge_stages(0) {}
  58         set merge_stages(1) {}
  59         set merge_stages(2) {}
  60         set merge_stages(3) {}
  61         set merge_stages_buf {}
  62
  63         set merge_stages_fd [eval git_read ls-files -u -z -- $path]
  64
  65         fconfigure $merge_stages_fd -blocking 0 -translation binary -encoding binary
  66         fileevent $merge_stages_fd readable [list read_merge_stages $merge_stages_fd $cont]
  67 }
  68
  69 proc read_merge_stages {fd cont} {
  70         global merge_stages_buf merge_stages_fd merge_stages
  71
  72         append merge_stages_buf [read $fd]
  73         set pck [split $merge_stages_buf "\0"]
  74         set merge_stages_buf [lindex $pck end]
  75
  76         if {[eof $fd] && $merge_stages_buf ne {}} {
  77                 lappend pck {}
  78                 set merge_stages_buf {}
  79         }
  80
  81         foreach p [lrange $pck 0 end-1] {
  82                 set fcols [split $p "\t"]
  83                 set cols  [split [lindex $fcols 0] " "]
  84                 set stage [lindex $cols 2]
  85
  86                 set merge_stages($stage) [lrange $cols 0 1]
  87         }
  88
  89         if {[eof $fd]} {
  90                 close $fd
  91                 unset merge_stages_fd
  92                 eval $cont
  93         }
  94 }
  95
  96 proc merge_resolve_tool {} {
  97         global current_diff_path
  98
  99         merge_load_stages $current_diff_path [list merge_resolve_tool2]
 100 }
 101
 102 proc merge_resolve_tool2 {} {
 103         global current_diff_path merge_stages
 104
 105         # Validate the stages
 106         if {$merge_stages(2) eq {} ||
 107             [lindex $merge_stages(2) 0] eq {120000} ||
 108             [lindex $merge_stages(2) 0] eq {160000} ||
 109             $merge_stages(3) eq {} ||
 110             [lindex $merge_stages(3) 0] eq {120000} ||
 111             [lindex $merge_stages(3) 0] eq {160000}
 112         } {
 113                 error_popup [mc "Cannot resolve deletion or link conflicts using a tool"]
 114                 return
 115         }
 116
 117         if {![file exists $current_diff_path]} {
 118                 error_popup [mc "Conflict file does not exist"]
 119                 return
 120         }
 121
 122         # Determine the tool to use
 123         set tool [get_config merge.tool]
 124         if {$tool eq {}} { set tool meld }
 125
 126         set merge_tool_path [get_config "mergetool.$tool.path"]
 127         if {$merge_tool_path eq {}} {
 128                 switch -- $tool {
 129                 emerge { set merge_tool_path "emacs" }
 130                 araxis { set merge_tool_path "compare" }
 131                 default { set merge_tool_path $tool }
 132                 }
 133         }
 134
 135         # Make file names
 136         set filebase [file rootname $current_diff_path]
 137         set fileext  [file extension $current_diff_path]
 138         set basename [lindex [file split $current_diff_path] end]
 139
 140         set MERGED   $current_diff_path
 141         set BASE     "./$MERGED.BASE$fileext"
 142         set LOCAL    "./$MERGED.LOCAL$fileext"
 143         set REMOTE   "./$MERGED.REMOTE$fileext"
 144         set BACKUP   "./$MERGED.BACKUP$fileext"
 145
 146         set base_stage $merge_stages(1)
 147
 148         # Build the command line
 149         switch -- $tool {
 150         kdiff3 {
 151                 if {$base_stage ne {}} {
 152                         set cmdline [list "$merge_tool_path" --auto --L1 "$MERGED (Base)" \
 153                                 --L2 "$MERGED (Local)" --L3 "$MERGED (Remote)" -o "$MERGED" "$BASE" "$LOCAL" "$REMOTE"]
 154                 } else {
 155                         set cmdline [list "$merge_tool_path" --auto --L1 "$MERGED (Local)" \
 156                                 --L2 "$MERGED (Remote)" -o "$MERGED" "$LOCAL" "$REMOTE"]
 157                 }
 158         }
 159         tkdiff {
 160                 if {$base_stage ne {}} {
 161                         set cmdline [list "$merge_tool_path" -a "$BASE" -o "$MERGED" "$LOCAL" "$REMOTE"]
 162                 } else {
 163                         set cmdline [list "$merge_tool_path" -o "$MERGED" "$LOCAL" "$REMOTE"]
 164                 }
 165         }
 166         meld {
 167                 set cmdline [list "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"]
 168         }
 169         gvimdiff {
 170                 set cmdline [list "$merge_tool_path" -f "$LOCAL" "$MERGED" "$REMOTE"]
 171         }
 172         xxdiff {
 173                 if {$base_stage ne {}} {
 174                         set cmdline [list "$merge_tool_path" -X --show-merged-pane \
 175                                             -R {Accel.SaveAsMerged: "Ctrl-S"} \
 176                                             -R {Accel.Search: "Ctrl+F"} \
 177                                             -R {Accel.SearchForward: "Ctrl-G"} \
 178                                             --merged-file "$MERGED" "$LOCAL" "$BASE" "$REMOTE"]
 179                 } else {
 180                         set cmdline [list "$merge_tool_path" -X --show-merged-pane \
 181                                             -R {Accel.SaveAsMerged: "Ctrl-S"} \
 182                                             -R {Accel.Search: "Ctrl+F"} \
 183                                             -R {Accel.SearchForward: "Ctrl-G"} \
 184                                             --merged-file "$MERGED" "$LOCAL" "$REMOTE"]
 185                 }
 186         }
 187         opendiff {
 188                 if {$base_stage ne {}} {
 189                         set cmdline [list "$merge_tool_path" "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$MERGED"]
 190                 } else {
 191                         set cmdline [list "$merge_tool_path" "$LOCAL" "$REMOTE" -merge "$MERGED"]
 192                 }
 193         }
 194         ecmerge {
 195                 if {$base_stage ne {}} {
 196                         set cmdline [list "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" --default --mode=merge3 --to="$MERGED"]
 197                 } else {
 198                         set cmdline [list "$merge_tool_path" "$LOCAL" "$REMOTE" --default --mode=merge2 --to="$MERGED"]
 199                 }
 200         }
 201         emerge {
 202                 if {$base_stage ne {}} {
 203                         set cmdline [list "$merge_tool_path" -f emerge-files-with-ancestor-command \
 204                                         "$LOCAL" "$REMOTE" "$BASE" "$basename"]
 205                 } else {
 206                         set cmdline [list "$merge_tool_path" -f emerge-files-command \
 207                                         "$LOCAL" "$REMOTE" "$basename"]
 208                 }
 209         }
 210         winmerge {
 211                 if {$base_stage ne {}} {
 212                         # This tool does not support 3-way merges.
 213                         # Use the 'conflict file' resolution feature instead.
 214                         set cmdline [list "$merge_tool_path" -e -ub "$MERGED"]
 215                 } else {
 216                         set cmdline [list "$merge_tool_path" -e -ub -wl \
 217                                 -dl "Theirs File" -dr "Mine File" "$REMOTE" "$LOCAL" "$MERGED"]
 218                 }
 219         }
 220         araxis {
 221                 if {$base_stage ne {}} {
 222                         set cmdline [list "$merge_tool_path" -wait -merge -3 -a1 \
 223                                 -title1:"'$MERGED (Base)'" -title2:"'$MERGED (Local)'" \
 224                                 -title3:"'$MERGED (Remote)'" \
 225                                 "$BASE" "$LOCAL" "$REMOTE" "$MERGED"]
 226                 } else {
 227                         set cmdline [list "$merge_tool_path" -wait -2 \
 228                                  -title1:"'$MERGED (Local)'" -title2:"'$MERGED (Remote)'" \
 229                                  "$LOCAL" "$REMOTE" "$MERGED"]
 230                 }
 231         }
 232         p4merge {
 233                 set cmdline [list "$merge_tool_path" "$BASE" "$REMOTE" "$LOCAL" "$MERGED"]
 234         }
 235         vimdiff {
 236                 error_popup [mc "Not a GUI merge tool: '%s'" $tool]
 237                 return
 238         }
 239         default {
 240                 error_popup [mc "Unsupported merge tool '%s'" $tool]
 241                 return
 242         }
 243         }
 244
 245         merge_tool_start $cmdline $MERGED $BACKUP [list $BASE $LOCAL $REMOTE]
 246 }
 247
 248 proc delete_temp_files {files} {
 249         foreach fname $files {
 250                 file delete $fname
 251         }
 252 }
 253
 254 proc merge_tool_get_stages {target stages} {
 255         global merge_stages
 256
 257         set i 1
 258         foreach fname $stages {
 259                 if {$merge_stages($i) eq {}} {
 260                         file delete $fname
 261                         catch { close [open $fname w] }
 262                 } else {
 263                         # A hack to support autocrlf properly
 264                         git checkout-index -f --stage=$i -- $target
 265                         file rename -force -- $target $fname
 266                 }
 267                 incr i
 268         }
 269 }
 270
 271 proc merge_tool_start {cmdline target backup stages} {
 272         global merge_stages mtool_target mtool_tmpfiles mtool_fd mtool_mtime
 273
 274         if {[info exists mtool_fd]} {
 275                 if {[ask_popup [mc "Merge tool is already running, terminate it?"]] eq {yes}} {
 276                         catch { kill_file_process $mtool_fd }
 277                         catch { close $mtool_fd }
 278                         unset mtool_fd
 279
 280                         set old_backup [lindex $mtool_tmpfiles end]
 281                         file rename -force -- $old_backup $mtool_target
 282                         delete_temp_files $mtool_tmpfiles
 283                 } else {
 284                         return
 285                 }
 286         }
 287
 288         # Save the original file
 289         file rename -force -- $target $backup
 290
 291         # Get the blobs; it destroys $target
 292         if {[catch {merge_tool_get_stages $target $stages} err]} {
 293                 file rename -force -- $backup $target
 294                 delete_temp_files $stages
 295                 error_popup [mc "Error retrieving versions:\n%s" $err]
 296                 return
 297         }
 298
 299         # Restore the conflict file
 300         file copy -force -- $backup $target
 301
 302         # Initialize global state
 303         set mtool_target $target
 304         set mtool_mtime [file mtime $target]
 305         set mtool_tmpfiles $stages
 306
 307         lappend mtool_tmpfiles $backup
 308
 309         # Force redirection to avoid interpreting output on stderr
 310         # as an error, and launch the tool
 311         lappend cmdline {2>@1}
 312
 313         if {[catch { set mtool_fd [_open_stdout_stderr $cmdline] } err]} {
 314                 delete_temp_files $mtool_tmpfiles
 315                 error_popup [mc "Could not start the merge tool:\n\n%s" $err]
 316                 return
 317         }
 318
 319         ui_status [mc "Running merge tool..."]
 320
 321         fconfigure $mtool_fd -blocking 0 -translation binary -encoding binary
 322         fileevent $mtool_fd readable [list read_mtool_output $mtool_fd]
 323 }
 324
 325 proc read_mtool_output {fd} {
 326         global mtool_fd mtool_tmpfiles
 327
 328         read $fd
 329         if {[eof $fd]} {
 330                 unset mtool_fd
 331
 332                 fconfigure $fd -blocking 1
 333                 merge_tool_finish $fd
 334         }
 335 }
 336
 337 proc merge_tool_finish {fd} {
 338         global mtool_tmpfiles mtool_target mtool_mtime
 339
 340         set backup [lindex $mtool_tmpfiles end]
 341         set failed 0
 342
 343         # Check the return code
 344         if {[catch {close $fd} err]} {
 345                 set failed 1
 346                 if {$err ne {child process exited abnormally}} {
 347                         error_popup [strcat [mc "Merge tool failed."] "\n\n$err"]
 348                 }
 349         }
 350
 351         # Check the modification time of the target file
 352         if {!$failed && [file mtime $mtool_target] eq $mtool_mtime} {
 353                 if {[ask_popup [mc "File %s unchanged, still accept as resolved?" \
 354                                 [short_path $mtool_target]]] ne {yes}} {
 355                         set failed 1
 356                 }
 357         }
 358
 359         # Finish
 360         if {$failed} {
 361                 file rename -force -- $backup $mtool_target
 362                 delete_temp_files $mtool_tmpfiles
 363                 ui_status [mc "Merge tool failed."]
 364         } else {
 365                 if {[is_config_true merge.keepbackup]} {
 366                         file rename -force -- $backup "$mtool_target.orig"
 367                 }
 368
 369                 delete_temp_files $mtool_tmpfiles
 370
 371                 merge_add_resolution $mtool_target
 372         }
 373 }