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-rw-r--r--git-gui/lib/mergetool.tcl400
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diff --git a/git-gui/lib/mergetool.tcl b/git-gui/lib/mergetool.tcl
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+# git-gui merge conflict resolution
+# parts based on git-mergetool (c) 2006 Theodore Y. Ts'o
+
+proc merge_resolve_one {stage} {
+ global current_diff_path
+
+ switch -- $stage {
+ 1 { set targetquestion [mc "Force resolution to the base version?"] }
+ 2 { set targetquestion [mc "Force resolution to this branch?"] }
+ 3 { set targetquestion [mc "Force resolution to the other branch?"] }
+ }
+
+ set op_question [strcat $targetquestion "\n" \
+[mc "Note that the diff shows only conflicting changes.
+
+%s will be overwritten.
+
+This operation can be undone only by restarting the merge." \
+ [short_path $current_diff_path]]]
+
+ if {[ask_popup $op_question] eq {yes}} {
+ merge_load_stages $current_diff_path [list merge_force_stage $stage]
+ }
+}
+
+proc merge_stage_workdir {path w lno} {
+ global current_diff_path diff_active
+
+ if {$diff_active} return
+
+ if {$path ne $current_diff_path} {
+ show_diff $path $w $lno {} [list do_merge_stage_workdir $path]
+ } else {
+ do_merge_stage_workdir $path
+ }
+}
+
+proc do_merge_stage_workdir {path} {
+ global current_diff_path is_conflict_diff
+
+ if {$path ne $current_diff_path} return;
+
+ if {$is_conflict_diff} {
+ if {[ask_popup [mc "File %s seems to have unresolved conflicts, still stage?" \
+ [short_path $path]]] ne {yes}} {
+ return
+ }
+ }
+
+ merge_add_resolution $path
+}
+
+proc merge_add_resolution {path} {
+ global current_diff_path ui_workdir
+
+ set after [next_diff_after_action $ui_workdir $path {} {^_?U}]
+
+ update_index \
+ [mc "Adding resolution for %s" [short_path $path]] \
+ [list $path] \
+ [concat $after [list ui_ready]]
+}
+
+proc merge_force_stage {stage} {
+ global current_diff_path merge_stages
+
+ if {$merge_stages($stage) ne {}} {
+ git checkout-index -f --stage=$stage -- $current_diff_path
+ } else {
+ file delete -- $current_diff_path
+ }
+
+ merge_add_resolution $current_diff_path
+}
+
+proc merge_load_stages {path cont} {
+ global merge_stages_fd merge_stages merge_stages_buf
+
+ if {[info exists merge_stages_fd]} {
+ catch { kill_file_process $merge_stages_fd }
+ catch { close $merge_stages_fd }
+ }
+
+ set merge_stages(0) {}
+ set merge_stages(1) {}
+ set merge_stages(2) {}
+ set merge_stages(3) {}
+ set merge_stages_buf {}
+
+ set merge_stages_fd [eval git_read ls-files -u -z -- $path]
+
+ fconfigure $merge_stages_fd -blocking 0 -translation binary -encoding binary
+ fileevent $merge_stages_fd readable [list read_merge_stages $merge_stages_fd $cont]
+}
+
+proc read_merge_stages {fd cont} {
+ global merge_stages_buf merge_stages_fd merge_stages
+
+ append merge_stages_buf [read $fd]
+ set pck [split $merge_stages_buf "\0"]
+ set merge_stages_buf [lindex $pck end]
+
+ if {[eof $fd] && $merge_stages_buf ne {}} {
+ lappend pck {}
+ set merge_stages_buf {}
+ }
+
+ foreach p [lrange $pck 0 end-1] {
+ set fcols [split $p "\t"]
+ set cols [split [lindex $fcols 0] " "]
+ set stage [lindex $cols 2]
+
+ set merge_stages($stage) [lrange $cols 0 1]
+ }
+
+ if {[eof $fd]} {
+ close $fd
+ unset merge_stages_fd
+ eval $cont
+ }
+}
+
+proc merge_resolve_tool {} {
+ global current_diff_path
+
+ merge_load_stages $current_diff_path [list merge_resolve_tool2]
+}
+
+proc merge_resolve_tool2 {} {
+ global current_diff_path merge_stages
+
+ # Validate the stages
+ if {$merge_stages(2) eq {} ||
+ [lindex $merge_stages(2) 0] eq {120000} ||
+ [lindex $merge_stages(2) 0] eq {160000} ||
+ $merge_stages(3) eq {} ||
+ [lindex $merge_stages(3) 0] eq {120000} ||
+ [lindex $merge_stages(3) 0] eq {160000}
+ } {
+ error_popup [mc "Cannot resolve deletion or link conflicts using a tool"]
+ return
+ }
+
+ if {![file exists $current_diff_path]} {
+ error_popup [mc "Conflict file does not exist"]
+ return
+ }
+
+ # Determine the tool to use
+ set tool [get_config merge.tool]
+ if {$tool eq {}} { set tool meld }
+
+ set merge_tool_path [get_config "mergetool.$tool.path"]
+ if {$merge_tool_path eq {}} {
+ switch -- $tool {
+ emerge { set merge_tool_path "emacs" }
+ araxis { set merge_tool_path "compare" }
+ default { set merge_tool_path $tool }
+ }
+ }
+
+ # Make file names
+ set filebase [file rootname $current_diff_path]
+ set fileext [file extension $current_diff_path]
+ set basename [lindex [file split $current_diff_path] end]
+
+ set MERGED $current_diff_path
+ set BASE "./$MERGED.BASE$fileext"
+ set LOCAL "./$MERGED.LOCAL$fileext"
+ set REMOTE "./$MERGED.REMOTE$fileext"
+ set BACKUP "./$MERGED.BACKUP$fileext"
+
+ set base_stage $merge_stages(1)
+
+ # Build the command line
+ switch -- $tool {
+ kdiff3 {
+ if {$base_stage ne {}} {
+ set cmdline [list "$merge_tool_path" --auto --L1 "$MERGED (Base)" \
+ --L2 "$MERGED (Local)" --L3 "$MERGED (Remote)" -o "$MERGED" "$BASE" "$LOCAL" "$REMOTE"]
+ } else {
+ set cmdline [list "$merge_tool_path" --auto --L1 "$MERGED (Local)" \
+ --L2 "$MERGED (Remote)" -o "$MERGED" "$LOCAL" "$REMOTE"]
+ }
+ }
+ tkdiff {
+ if {$base_stage ne {}} {
+ set cmdline [list "$merge_tool_path" -a "$BASE" -o "$MERGED" "$LOCAL" "$REMOTE"]
+ } else {
+ set cmdline [list "$merge_tool_path" -o "$MERGED" "$LOCAL" "$REMOTE"]
+ }
+ }
+ meld {
+ set cmdline [list "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"]
+ }
+ gvimdiff {
+ set cmdline [list "$merge_tool_path" -f "$LOCAL" "$MERGED" "$REMOTE"]
+ }
+ xxdiff {
+ if {$base_stage ne {}} {
+ set cmdline [list "$merge_tool_path" -X --show-merged-pane \
+ -R {Accel.SaveAsMerged: "Ctrl-S"} \
+ -R {Accel.Search: "Ctrl+F"} \
+ -R {Accel.SearchForward: "Ctrl-G"} \
+ --merged-file "$MERGED" "$LOCAL" "$BASE" "$REMOTE"]
+ } else {
+ set cmdline [list "$merge_tool_path" -X --show-merged-pane \
+ -R {Accel.SaveAsMerged: "Ctrl-S"} \
+ -R {Accel.Search: "Ctrl+F"} \
+ -R {Accel.SearchForward: "Ctrl-G"} \
+ --merged-file "$MERGED" "$LOCAL" "$REMOTE"]
+ }
+ }
+ opendiff {
+ if {$base_stage ne {}} {
+ set cmdline [list "$merge_tool_path" "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$MERGED"]
+ } else {
+ set cmdline [list "$merge_tool_path" "$LOCAL" "$REMOTE" -merge "$MERGED"]
+ }
+ }
+ ecmerge {
+ if {$base_stage ne {}} {
+ set cmdline [list "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" --default --mode=merge3 --to="$MERGED"]
+ } else {
+ set cmdline [list "$merge_tool_path" "$LOCAL" "$REMOTE" --default --mode=merge2 --to="$MERGED"]
+ }
+ }
+ emerge {
+ if {$base_stage ne {}} {
+ set cmdline [list "$merge_tool_path" -f emerge-files-with-ancestor-command \
+ "$LOCAL" "$REMOTE" "$BASE" "$basename"]
+ } else {
+ set cmdline [list "$merge_tool_path" -f emerge-files-command \
+ "$LOCAL" "$REMOTE" "$basename"]
+ }
+ }
+ winmerge {
+ if {$base_stage ne {}} {
+ # This tool does not support 3-way merges.
+ # Use the 'conflict file' resolution feature instead.
+ set cmdline [list "$merge_tool_path" -e -ub "$MERGED"]
+ } else {
+ set cmdline [list "$merge_tool_path" -e -ub -wl \
+ -dl "Theirs File" -dr "Mine File" "$REMOTE" "$LOCAL" "$MERGED"]
+ }
+ }
+ araxis {
+ if {$base_stage ne {}} {
+ set cmdline [list "$merge_tool_path" -wait -merge -3 -a1 \
+ -title1:"'$MERGED (Base)'" -title2:"'$MERGED (Local)'" \
+ -title3:"'$MERGED (Remote)'" \
+ "$BASE" "$LOCAL" "$REMOTE" "$MERGED"]
+ } else {
+ set cmdline [list "$merge_tool_path" -wait -2 \
+ -title1:"'$MERGED (Local)'" -title2:"'$MERGED (Remote)'" \
+ "$LOCAL" "$REMOTE" "$MERGED"]
+ }
+ }
+ p4merge {
+ set cmdline [list "$merge_tool_path" "$BASE" "$REMOTE" "$LOCAL" "$MERGED"]
+ }
+ vimdiff {
+ error_popup [mc "Not a GUI merge tool: '%s'" $tool]
+ return
+ }
+ default {
+ error_popup [mc "Unsupported merge tool '%s'" $tool]
+ return
+ }
+ }
+
+ merge_tool_start $cmdline $MERGED $BACKUP [list $BASE $LOCAL $REMOTE]
+}
+
+proc delete_temp_files {files} {
+ foreach fname $files {
+ file delete $fname
+ }
+}
+
+proc merge_tool_get_stages {target stages} {
+ global merge_stages
+
+ set i 1
+ foreach fname $stages {
+ if {$merge_stages($i) eq {}} {
+ file delete $fname
+ catch { close [open $fname w] }
+ } else {
+ # A hack to support autocrlf properly
+ git checkout-index -f --stage=$i -- $target
+ file rename -force -- $target $fname
+ }
+ incr i
+ }
+}
+
+proc merge_tool_start {cmdline target backup stages} {
+ global merge_stages mtool_target mtool_tmpfiles mtool_fd mtool_mtime
+
+ if {[info exists mtool_fd]} {
+ if {[ask_popup [mc "Merge tool is already running, terminate it?"]] eq {yes}} {
+ catch { kill_file_process $mtool_fd }
+ catch { close $mtool_fd }
+ unset mtool_fd
+
+ set old_backup [lindex $mtool_tmpfiles end]
+ file rename -force -- $old_backup $mtool_target
+ delete_temp_files $mtool_tmpfiles
+ } else {
+ return
+ }
+ }
+
+ # Save the original file
+ file rename -force -- $target $backup
+
+ # Get the blobs; it destroys $target
+ if {[catch {merge_tool_get_stages $target $stages} err]} {
+ file rename -force -- $backup $target
+ delete_temp_files $stages
+ error_popup [mc "Error retrieving versions:\n%s" $err]
+ return
+ }
+
+ # Restore the conflict file
+ file copy -force -- $backup $target
+
+ # Initialize global state
+ set mtool_target $target
+ set mtool_mtime [file mtime $target]
+ set mtool_tmpfiles $stages
+
+ lappend mtool_tmpfiles $backup
+
+ # Force redirection to avoid interpreting output on stderr
+ # as an error, and launch the tool
+ lappend cmdline {2>@1}
+
+ if {[catch { set mtool_fd [_open_stdout_stderr $cmdline] } err]} {
+ delete_temp_files $mtool_tmpfiles
+ error_popup [mc "Could not start the merge tool:\n\n%s" $err]
+ return
+ }
+
+ ui_status [mc "Running merge tool..."]
+
+ fconfigure $mtool_fd -blocking 0 -translation binary -encoding binary
+ fileevent $mtool_fd readable [list read_mtool_output $mtool_fd]
+}
+
+proc read_mtool_output {fd} {
+ global mtool_fd mtool_tmpfiles
+
+ read $fd
+ if {[eof $fd]} {
+ unset mtool_fd
+
+ fconfigure $fd -blocking 1
+ merge_tool_finish $fd
+ }
+}
+
+proc merge_tool_finish {fd} {
+ global mtool_tmpfiles mtool_target mtool_mtime
+
+ set backup [lindex $mtool_tmpfiles end]
+ set failed 0
+
+ # Check the return code
+ if {[catch {close $fd} err]} {
+ set failed 1
+ if {$err ne {child process exited abnormally}} {
+ error_popup [strcat [mc "Merge tool failed."] "\n\n$err"]
+ }
+ }
+
+ # Check the modification time of the target file
+ if {!$failed && [file mtime $mtool_target] eq $mtool_mtime} {
+ if {[ask_popup [mc "File %s unchanged, still accept as resolved?" \
+ [short_path $mtool_target]]] ne {yes}} {
+ set failed 1
+ }
+ }
+
+ # Finish
+ if {$failed} {
+ file rename -force -- $backup $mtool_target
+ delete_temp_files $mtool_tmpfiles
+ ui_status [mc "Merge tool failed."]
+ } else {
+ if {[is_config_true merge.keepbackup]} {
+ file rename -force -- $backup "$mtool_target.orig"
+ }
+
+ delete_temp_files $mtool_tmpfiles
+
+ merge_add_resolution $mtool_target
+ }
+}