[PATCH 2/2] git-gui: support for diff3 conflict style

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This adds highlight support for the diff3 conflict style.

The common pre-image will be reversed to --, because it has been removed
and either replaced with our or their side.

Signed-off-by: Bert Wesarg <bert.wesarg@xxxxxxxxxxxxxx>
---

Maybe it's not too late for the next release.

 git-gui.sh   |    3 +++
 lib/diff.tcl |   12 ++++++++++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/git-gui.sh b/git-gui.sh
index d5c1535..6adcda6 100755
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -3388,6 +3388,9 @@ $ui_diff tag conf d_s- \
 $ui_diff tag conf d< \
 	-foreground orange \
 	-font font_diffbold
+$ui_diff tag conf d| \
+	-foreground orange \
+	-font font_diffbold
 $ui_diff tag conf d= \
 	-foreground orange \
 	-font font_diffbold
diff --git a/lib/diff.tcl b/lib/diff.tcl
index 39e4d90..11f9e16 100644
--- a/lib/diff.tcl
+++ b/lib/diff.tcl
@@ -339,6 +339,7 @@ proc start_show_diff {cont_info {add_opts {}}} {
 	}
 
 	set ::current_diff_inheader 1
+	set ::in_conflict_pre_image 0
 	fconfigure $fd \
 		-blocking 0 \
 		-encoding [get_path_encoding $path] \
@@ -439,10 +440,21 @@ proc read_diff {fd conflict_size cont_info} {
 			{++} {
 				set regexp [string map [list %conflict_size $conflict_size]\
 								{^\+\+([<>=]){%conflict_size}(?: |$)}]
+				set regexp_pre_image [string map [list %conflict_size $conflict_size]\
+								{^\+\+\|{%conflict_size}(?: |$)]
 				if {[regexp $regexp $line _g op]} {
 					set is_conflict_diff 1
 					set line [string replace $line 0 1 {  }]
 					set tags d$op
+					set ::in_conflict_pre_image 0
+				} elseif {[regexp $regexp_pre_image $line]} {
+					set is_conflict_diff 1
+					set line [string replace $line 0 1 {  }]
+					set tags d|
+					set ::in_conflict_pre_image 1
+				} elseif ($::in_conflict_pre_image) {
+					set line [string replace $line 0 1 {--}]
+					set tags d_--
 				} else {
 					set tags d_++
 				}
-- 
1.7.4.1.1319.ga04f7.dirty

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