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-rw-r--r--git-gui/lib/diff.tcl336
1 files changed, 336 insertions, 0 deletions
diff --git a/git-gui/lib/diff.tcl b/git-gui/lib/diff.tcl
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+++ b/git-gui/lib/diff.tcl
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+# git-gui diff viewer
+# Copyright (C) 2006, 2007 Shawn Pearce
+
+proc clear_diff {} {
+ global ui_diff current_diff_path current_diff_header
+ global ui_index ui_workdir
+
+ $ui_diff conf -state normal
+ $ui_diff delete 0.0 end
+ $ui_diff conf -state disabled
+
+ set current_diff_path {}
+ set current_diff_header {}
+
+ $ui_index tag remove in_diff 0.0 end
+ $ui_workdir tag remove in_diff 0.0 end
+}
+
+proc reshow_diff {} {
+ global file_states file_lists
+ global current_diff_path current_diff_side
+
+ set p $current_diff_path
+ if {$p eq {}} {
+ # No diff is being shown.
+ } elseif {$current_diff_side eq {}
+ || [catch {set s $file_states($p)}]
+ || [lsearch -sorted -exact $file_lists($current_diff_side) $p] == -1} {
+ clear_diff
+ } else {
+ show_diff $p $current_diff_side
+ }
+}
+
+proc handle_empty_diff {} {
+ global current_diff_path file_states file_lists
+
+ set path $current_diff_path
+ set s $file_states($path)
+ if {[lindex $s 0] ne {_M}} return
+
+ info_popup "No differences detected.
+
+[short_path $path] has no changes.
+
+The modification date of this file was updated by another application, but the content within the file was not changed.
+
+A rescan will be automatically started to find other files which may have the same state."
+
+ clear_diff
+ display_file $path __
+ rescan ui_ready 0
+}
+
+proc show_diff {path w {lno {}}} {
+ global file_states file_lists
+ global is_3way_diff diff_active repo_config
+ global ui_diff ui_index ui_workdir
+ global current_diff_path current_diff_side current_diff_header
+
+ if {$diff_active || ![lock_index read]} return
+
+ clear_diff
+ if {$lno == {}} {
+ set lno [lsearch -sorted -exact $file_lists($w) $path]
+ if {$lno >= 0} {
+ incr lno
+ }
+ }
+ if {$lno >= 1} {
+ $w tag add in_diff $lno.0 [expr {$lno + 1}].0
+ }
+
+ set s $file_states($path)
+ set m [lindex $s 0]
+ set is_3way_diff 0
+ set diff_active 1
+ set current_diff_path $path
+ set current_diff_side $w
+ set current_diff_header {}
+ ui_status "Loading diff of [escape_path $path]..."
+
+ # - Git won't give us the diff, there's nothing to compare to!
+ #
+ if {$m eq {_O}} {
+ set max_sz [expr {128 * 1024}]
+ if {[catch {
+ set fd [open $path r]
+ set content [read $fd $max_sz]
+ close $fd
+ set sz [file size $path]
+ } err ]} {
+ set diff_active 0
+ unlock_index
+ ui_status "Unable to display [escape_path $path]"
+ error_popup "Error loading file:\n\n$err"
+ return
+ }
+ $ui_diff conf -state normal
+ if {![catch {set type [exec file $path]}]} {
+ set n [string length $path]
+ if {[string equal -length $n $path $type]} {
+ set type [string range $type $n end]
+ regsub {^:?\s*} $type {} type
+ }
+ $ui_diff insert end "* $type\n" d_@
+ }
+ if {[string first "\0" $content] != -1} {
+ $ui_diff insert end \
+ "* Binary file (not showing content)." \
+ d_@
+ } else {
+ if {$sz > $max_sz} {
+ $ui_diff insert end \
+"* Untracked file is $sz bytes.
+* Showing only first $max_sz bytes.
+" d_@
+ }
+ $ui_diff insert end $content
+ if {$sz > $max_sz} {
+ $ui_diff insert end "
+* Untracked file clipped here by [appname].
+* To see the entire file, use an external editor.
+" d_@
+ }
+ }
+ $ui_diff conf -state disabled
+ set diff_active 0
+ unlock_index
+ ui_ready
+ return
+ }
+
+ set cmd [list]
+ if {$w eq $ui_index} {
+ lappend cmd diff-index
+ lappend cmd --cached
+ } elseif {$w eq $ui_workdir} {
+ if {[string index $m 0] eq {U}} {
+ lappend cmd diff
+ } else {
+ lappend cmd diff-files
+ }
+ }
+
+ lappend cmd -p
+ lappend cmd --no-color
+ if {$repo_config(gui.diffcontext) >= 0} {
+ lappend cmd "-U$repo_config(gui.diffcontext)"
+ }
+ if {$w eq $ui_index} {
+ lappend cmd [PARENT]
+ }
+ lappend cmd --
+ lappend cmd $path
+
+ if {[catch {set fd [eval git_read --nice $cmd]} err]} {
+ set diff_active 0
+ unlock_index
+ ui_status "Unable to display [escape_path $path]"
+ error_popup "Error loading diff:\n\n$err"
+ return
+ }
+
+ fconfigure $fd \
+ -blocking 0 \
+ -encoding binary \
+ -translation binary
+ fileevent $fd readable [list read_diff $fd]
+}
+
+proc read_diff {fd} {
+ global ui_diff diff_active
+ global is_3way_diff current_diff_header
+
+ $ui_diff conf -state normal
+ while {[gets $fd line] >= 0} {
+ # -- Cleanup uninteresting diff header lines.
+ #
+ if { [string match {diff --git *} $line]
+ || [string match {diff --cc *} $line]
+ || [string match {diff --combined *} $line]
+ || [string match {--- *} $line]
+ || [string match {+++ *} $line]} {
+ append current_diff_header $line "\n"
+ continue
+ }
+ if {[string match {index *} $line]} continue
+ if {$line eq {deleted file mode 120000}} {
+ set line "deleted symlink"
+ }
+
+ # -- Automatically detect if this is a 3 way diff.
+ #
+ if {[string match {@@@ *} $line]} {set is_3way_diff 1}
+
+ if {[string match {mode *} $line]
+ || [string match {new file *} $line]
+ || [string match {deleted file *} $line]
+ || [string match {Binary files * and * differ} $line]
+ || $line eq {\ No newline at end of file}
+ || [regexp {^\* Unmerged path } $line]} {
+ set tags {}
+ } elseif {$is_3way_diff} {
+ set op [string range $line 0 1]
+ switch -- $op {
+ { } {set tags {}}
+ {@@} {set tags d_@}
+ { +} {set tags d_s+}
+ { -} {set tags d_s-}
+ {+ } {set tags d_+s}
+ {- } {set tags d_-s}
+ {--} {set tags d_--}
+ {++} {
+ if {[regexp {^\+\+([<>]{7} |={7})} $line _g op]} {
+ set line [string replace $line 0 1 { }]
+ set tags d$op
+ } else {
+ set tags d_++
+ }
+ }
+ default {
+ puts "error: Unhandled 3 way diff marker: {$op}"
+ set tags {}
+ }
+ }
+ } else {
+ set op [string index $line 0]
+ switch -- $op {
+ { } {set tags {}}
+ {@} {set tags d_@}
+ {-} {set tags d_-}
+ {+} {
+ if {[regexp {^\+([<>]{7} |={7})} $line _g op]} {
+ set line [string replace $line 0 0 { }]
+ set tags d$op
+ } else {
+ set tags d_+
+ }
+ }
+ default {
+ puts "error: Unhandled 2 way diff marker: {$op}"
+ set tags {}
+ }
+ }
+ }
+ $ui_diff insert end $line $tags
+ if {[string index $line end] eq "\r"} {
+ $ui_diff tag add d_cr {end - 2c}
+ }
+ $ui_diff insert end "\n" $tags
+ }
+ $ui_diff conf -state disabled
+
+ if {[eof $fd]} {
+ close $fd
+ set diff_active 0
+ unlock_index
+ ui_ready
+
+ if {[$ui_diff index end] eq {2.0}} {
+ handle_empty_diff
+ }
+ }
+}
+
+proc apply_hunk {x y} {
+ global current_diff_path current_diff_header current_diff_side
+ global ui_diff ui_index file_states
+
+ if {$current_diff_path eq {} || $current_diff_header eq {}} return
+ if {![lock_index apply_hunk]} return
+
+ set apply_cmd {apply --cached --whitespace=nowarn}
+ set mi [lindex $file_states($current_diff_path) 0]
+ if {$current_diff_side eq $ui_index} {
+ set mode unstage
+ lappend apply_cmd --reverse
+ if {[string index $mi 0] ne {M}} {
+ unlock_index
+ return
+ }
+ } else {
+ set mode stage
+ if {[string index $mi 1] ne {M}} {
+ unlock_index
+ return
+ }
+ }
+
+ set s_lno [lindex [split [$ui_diff index @$x,$y] .] 0]
+ set s_lno [$ui_diff search -backwards -regexp ^@@ $s_lno.0 0.0]
+ if {$s_lno eq {}} {
+ unlock_index
+ return
+ }
+
+ set e_lno [$ui_diff search -forwards -regexp ^@@ "$s_lno + 1 lines" end]
+ if {$e_lno eq {}} {
+ set e_lno end
+ }
+
+ if {[catch {
+ set p [eval git_write $apply_cmd]
+ fconfigure $p -translation binary -encoding binary
+ puts -nonewline $p $current_diff_header
+ puts -nonewline $p [$ui_diff get $s_lno $e_lno]
+ close $p} err]} {
+ error_popup "Failed to $mode selected hunk.\n\n$err"
+ unlock_index
+ return
+ }
+
+ $ui_diff conf -state normal
+ $ui_diff delete $s_lno $e_lno
+ $ui_diff conf -state disabled
+
+ if {[$ui_diff get 1.0 end] eq "\n"} {
+ set o _
+ } else {
+ set o ?
+ }
+
+ if {$current_diff_side eq $ui_index} {
+ set mi ${o}M
+ } elseif {[string index $mi 0] eq {_}} {
+ set mi M$o
+ } else {
+ set mi ?$o
+ }
+ unlock_index
+ display_file $current_diff_path $mi
+ if {$o eq {_}} {
+ clear_diff
+ }
+}