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 targetquestion [mc "Force resolution to the base version?"] }
   9                 2 { set targetquestion [mc "Force resolution to this branch?"] }
  10                 3 { set targetquestion [mc "Force resolution to the other branch?"] }
  11         }
  12
  13         set op_question [strcat $targetquestion "\n" \
  14 [mc "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                 [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 $stage]
  23         }
  24 }
  25
  26 proc merge_stage_workdir {path {lno {}}} {
  27         global current_diff_path diff_active
  28         global current_diff_side ui_workdir
  29
  30         if {$diff_active} return
  31
  32         if {$path ne $current_diff_path || $ui_workdir ne $current_diff_side} {
  33                 show_diff $path $ui_workdir $lno {} [list do_merge_stage_workdir $path]
  34         } else {
  35                 do_merge_stage_workdir $path
  36         }
  37 }
  38
  39 proc do_merge_stage_workdir {path} {
  40         global current_diff_path is_conflict_diff
  41
  42         if {$path ne $current_diff_path} return;
  43
  44         if {$is_conflict_diff} {
  45                 if {[ask_popup [mc "File %s seems to have unresolved conflicts, still stage?" \
  46                                 [short_path $path]]] ne {yes}} {
  47                         return
  48                 }
  49         }
  50
  51         merge_add_resolution $path
  52 }
  53
  54 proc merge_add_resolution {path} {
  55         global current_diff_path ui_workdir
  56
  57         set after [next_diff_after_action $ui_workdir $path {} {^_?U}]
  58
  59         update_index \
  60                 [mc "Adding resolution for %s" [short_path $path]] \
  61                 [list $path] \
  62                 [concat $after [list ui_ready]]
  63 }
  64
  65 proc merge_force_stage {stage} {
  66         global current_diff_path merge_stages
  67
  68         if {$merge_stages($stage) ne {}} {
  69                 git checkout-index -f --stage=$stage -- $current_diff_path
  70         } else {
  71                 file delete -- $current_diff_path
  72         }
  73
  74         merge_add_resolution $current_diff_path
  75 }
  76
  77 proc merge_load_stages {path cont} {
  78         global merge_stages_fd merge_stages merge_stages_buf
  79
  80         if {[info exists merge_stages_fd]} {
  81                 catch { kill_file_process $merge_stages_fd }
  82                 catch { close $merge_stages_fd }
  83         }
  84
  85         set merge_stages(0) {}
  86         set merge_stages(1) {}
  87         set merge_stages(2) {}
  88         set merge_stages(3) {}
  89         set merge_stages_buf {}
  90
  91         set merge_stages_fd [eval git_read ls-files -u -z -- {$path}]
  92
  93         fconfigure $merge_stages_fd -blocking 0 -translation binary -encoding binary
  94         fileevent $merge_stages_fd readable [list read_merge_stages $merge_stages_fd $cont]
  95 }
  96
  97 proc read_merge_stages {fd cont} {
  98         global merge_stages_buf merge_stages_fd merge_stages
  99
 100         append merge_stages_buf [read $fd]
 101         set pck [split $merge_stages_buf "\0"]
 102         set merge_stages_buf [lindex $pck end]
 103
 104         if {[eof $fd] && $merge_stages_buf ne {}} {
 105                 lappend pck {}
 106                 set merge_stages_buf {}
 107         }
 108
 109         foreach p [lrange $pck 0 end-1] {
 110                 set fcols [split $p "\t"]
 111                 set cols  [split [lindex $fcols 0] " "]
 112                 set stage [lindex $cols 2]
 113
 114                 set merge_stages($stage) [lrange $cols 0 1]
 115         }
 116
 117         if {[eof $fd]} {
 118                 close $fd
 119                 unset merge_stages_fd
 120                 eval $cont
 121         }
 122 }
 123
 124 proc merge_resolve_tool {} {
 125         global current_diff_path
 126
 127         merge_load_stages $current_diff_path [list merge_resolve_tool2]
 128 }
 129
 130 proc merge_resolve_tool2 {} {
 131         global current_diff_path merge_stages
 132
 133         # Validate the stages
 134         if {$merge_stages(2) eq {} ||
 135             [lindex $merge_stages(2) 0] eq {120000} ||
 136             [lindex $merge_stages(2) 0] eq {160000} ||
 137             $merge_stages(3) eq {} ||
 138             [lindex $merge_stages(3) 0] eq {120000} ||
 139             [lindex $merge_stages(3) 0] eq {160000}
 140         } {
 141                 error_popup [mc "Cannot resolve deletion or link conflicts using a tool"]
 142                 return
 143         }
 144
 145         if {![file exists $current_diff_path]} {
 146                 error_popup [mc "Conflict file does not exist"]
 147                 return
 148         }
 149
 150         # Determine the tool to use
 151         set tool [get_config merge.tool]
 152         if {$tool eq {}} { set tool meld }
 153
 154         set merge_tool_path [get_config "mergetool.$tool.path"]
 155         if {$merge_tool_path eq {}} {
 156                 switch -- $tool {
 157                 emerge { set merge_tool_path "emacs" }
 158                 araxis { set merge_tool_path "compare" }
 159                 default { set merge_tool_path $tool }
 160                 }
 161         }
 162
 163         # Make file names
 164         set filebase [file rootname $current_diff_path]
 165         set fileext  [file extension $current_diff_path]
 166         set basename [lindex [file split $current_diff_path] end]
 167
 168         set MERGED   $current_diff_path
 169         set BASE     "./$MERGED.BASE$fileext"
 170         set LOCAL    "./$MERGED.LOCAL$fileext"
 171         set REMOTE   "./$MERGED.REMOTE$fileext"
 172         set BACKUP   "./$MERGED.BACKUP$fileext"
 173
 174         set base_stage $merge_stages(1)
 175
 176         # Build the command line
 177         switch -- $tool {
 178         kdiff3 {
 179                 if {$base_stage ne {}} {
 180                         set cmdline [list "$merge_tool_path" --auto --L1 "$MERGED (Base)" \
 181                                 --L2 "$MERGED (Local)" --L3 "$MERGED (Remote)" -o "$MERGED" "$BASE" "$LOCAL" "$REMOTE"]
 182                 } else {
 183                         set cmdline [list "$merge_tool_path" --auto --L1 "$MERGED (Local)" \
 184                                 --L2 "$MERGED (Remote)" -o "$MERGED" "$LOCAL" "$REMOTE"]
 185                 }
 186         }
 187         tkdiff {
 188                 if {$base_stage ne {}} {
 189                         set cmdline [list "$merge_tool_path" -a "$BASE" -o "$MERGED" "$LOCAL" "$REMOTE"]
 190                 } else {
 191                         set cmdline [list "$merge_tool_path" -o "$MERGED" "$LOCAL" "$REMOTE"]
 192                 }
 193         }
 194         meld {
 195                 set cmdline [list "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"]
 196         }
 197         gvimdiff {
 198                 set cmdline [list "$merge_tool_path" -f "$LOCAL" "$MERGED" "$REMOTE"]
 199         }
 200         xxdiff {
 201                 if {$base_stage ne {}} {
 202                         set cmdline [list "$merge_tool_path" -X --show-merged-pane \
 203                                             -R {Accel.SaveAsMerged: "Ctrl-S"} \
 204                                             -R {Accel.Search: "Ctrl+F"} \
 205                                             -R {Accel.SearchForward: "Ctrl-G"} \
 206                                             --merged-file "$MERGED" "$LOCAL" "$BASE" "$REMOTE"]
 207                 } else {
 208                         set cmdline [list "$merge_tool_path" -X --show-merged-pane \
 209                                             -R {Accel.SaveAsMerged: "Ctrl-S"} \
 210                                             -R {Accel.Search: "Ctrl+F"} \
 211                                             -R {Accel.SearchForward: "Ctrl-G"} \
 212                                             --merged-file "$MERGED" "$LOCAL" "$REMOTE"]
 213                 }
 214         }
 215         opendiff {
 216                 if {$base_stage ne {}} {
 217                         set cmdline [list "$merge_tool_path" "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$MERGED"]
 218                 } else {
 219                         set cmdline [list "$merge_tool_path" "$LOCAL" "$REMOTE" -merge "$MERGED"]
 220                 }
 221         }
 222         ecmerge {
 223                 if {$base_stage ne {}} {
 224                         set cmdline [list "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" --default --mode=merge3 --to="$MERGED"]
 225                 } else {
 226                         set cmdline [list "$merge_tool_path" "$LOCAL" "$REMOTE" --default --mode=merge2 --to="$MERGED"]
 227                 }
 228         }
 229         emerge {
 230                 if {$base_stage ne {}} {
 231                         set cmdline [list "$merge_tool_path" -f emerge-files-with-ancestor-command \
 232                                         "$LOCAL" "$REMOTE" "$BASE" "$basename"]
 233                 } else {
 234                         set cmdline [list "$merge_tool_path" -f emerge-files-command \
 235                                         "$LOCAL" "$REMOTE" "$basename"]
 236                 }
 237         }
 238         winmerge {
 239                 if {$base_stage ne {}} {
 240                         # This tool does not support 3-way merges.
 241                         # Use the 'conflict file' resolution feature instead.
 242                         set cmdline [list "$merge_tool_path" -e -ub "$MERGED"]
 243                 } else {
 244                         set cmdline [list "$merge_tool_path" -e -ub -wl \
 245                                 -dl "Theirs File" -dr "Mine File" "$REMOTE" "$LOCAL" "$MERGED"]
 246                 }
 247         }
 248         araxis {
 249                 if {$base_stage ne {}} {
 250                         set cmdline [list "$merge_tool_path" -wait -merge -3 -a1 \
 251                                 -title1:"'$MERGED (Base)'" -title2:"'$MERGED (Local)'" \
 252                                 -title3:"'$MERGED (Remote)'" \
 253                                 "$BASE" "$LOCAL" "$REMOTE" "$MERGED"]
 254                 } else {
 255                         set cmdline [list "$merge_tool_path" -wait -2 \
 256                                  -title1:"'$MERGED (Local)'" -title2:"'$MERGED (Remote)'" \
 257                                  "$LOCAL" "$REMOTE" "$MERGED"]
 258                 }
 259         }
 260         p4merge {
 261                 set cmdline [list "$merge_tool_path" "$BASE" "$REMOTE" "$LOCAL" "$MERGED"]
 262         }
 263         vimdiff {
 264                 error_popup [mc "Not a GUI merge tool: '%s'" $tool]
 265                 return
 266         }
 267         default {
 268                 error_popup [mc "Unsupported merge tool '%s'" $tool]
 269                 return
 270         }
 271         }
 272
 273         merge_tool_start $cmdline $MERGED $BACKUP [list $BASE $LOCAL $REMOTE]
 274 }
 275
 276 proc delete_temp_files {files} {
 277         foreach fname $files {
 278                 file delete $fname
 279         }
 280 }
 281
 282 proc merge_tool_get_stages {target stages} {
 283         global merge_stages
 284
 285         set i 1
 286         foreach fname $stages {
 287                 if {$merge_stages($i) eq {}} {
 288                         file delete $fname
 289                         catch { close [open $fname w] }
 290                 } else {
 291                         # A hack to support autocrlf properly
 292                         git checkout-index -f --stage=$i -- $target
 293                         file rename -force -- $target $fname
 294                 }
 295                 incr i
 296         }
 297 }
 298
 299 proc merge_tool_start {cmdline target backup stages} {
 300         global merge_stages mtool_target mtool_tmpfiles mtool_fd mtool_mtime
 301
 302         if {[info exists mtool_fd]} {
 303                 if {[ask_popup [mc "Merge tool is already running, terminate it?"]] eq {yes}} {
 304                         catch { kill_file_process $mtool_fd }
 305                         catch { close $mtool_fd }
 306                         unset mtool_fd
 307
 308                         set old_backup [lindex $mtool_tmpfiles end]
 309                         file rename -force -- $old_backup $mtool_target
 310                         delete_temp_files $mtool_tmpfiles
 311                 } else {
 312                         return
 313                 }
 314         }
 315
 316         # Save the original file
 317         file rename -force -- $target $backup
 318
 319         # Get the blobs; it destroys $target
 320         if {[catch {merge_tool_get_stages $target $stages} err]} {
 321                 file rename -force -- $backup $target
 322                 delete_temp_files $stages
 323                 error_popup [mc "Error retrieving versions:\n%s" $err]
 324                 return
 325         }
 326
 327         # Restore the conflict file
 328         file copy -force -- $backup $target
 329
 330         # Initialize global state
 331         set mtool_target $target
 332         set mtool_mtime [file mtime $target]
 333         set mtool_tmpfiles $stages
 334
 335         lappend mtool_tmpfiles $backup
 336
 337         # Force redirection to avoid interpreting output on stderr
 338         # as an error, and launch the tool
 339         lappend cmdline {2>@1}
 340
 341         if {[catch { set mtool_fd [_open_stdout_stderr $cmdline] } err]} {
 342                 delete_temp_files $mtool_tmpfiles
 343                 error_popup [mc "Could not start the merge tool:\n\n%s" $err]
 344                 return
 345         }
 346
 347         ui_status [mc "Running merge tool..."]
 348
 349         fconfigure $mtool_fd -blocking 0 -translation binary -encoding binary
 350         fileevent $mtool_fd readable [list read_mtool_output $mtool_fd]
 351 }
 352
 353 proc read_mtool_output {fd} {
 354         global mtool_fd mtool_tmpfiles
 355
 356         read $fd
 357         if {[eof $fd]} {
 358                 unset mtool_fd
 359
 360                 fconfigure $fd -blocking 1
 361                 merge_tool_finish $fd
 362         }
 363 }
 364
 365 proc merge_tool_finish {fd} {
 366         global mtool_tmpfiles mtool_target mtool_mtime
 367
 368         set backup [lindex $mtool_tmpfiles end]
 369         set failed 0
 370
 371         # Check the return code
 372         if {[catch {close $fd} err]} {
 373                 set failed 1
 374                 if {$err ne {child process exited abnormally}} {
 375                         error_popup [strcat [mc "Merge tool failed."] "\n\n$err"]
 376                 }
 377         }
 378
 379         # Finish
 380         if {$failed} {
 381                 file rename -force -- $backup $mtool_target
 382                 delete_temp_files $mtool_tmpfiles
 383                 ui_status [mc "Merge tool failed."]
 384         } else {
 385                 if {[is_config_true mergetool.keepbackup]} {
 386                         file rename -force -- $backup "$mtool_target.orig"
 387                 }
 388
 389                 delete_temp_files $mtool_tmpfiles
 390
 391                 reshow_diff
 392         }
 393 }