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