[PATCH] Add emacs 'ediff' mode to git-mergetool's tools

[Jason Sewall <jasonsewall@gmail.com>]

It is now possible to specifiy 'ediff' as a value to the '--tool=' option to git-mergetool; this invokes an ediff session in emacs with the appropriate files.

Signed-off-by: Jason Sewall <jasonsewall@gmail.com>
---

Ediff is is an emacs mode similar to emerge for performing merges; it is fuller-featured than emerge and I find it easier to use.

 git-mergetool.sh |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/git-mergetool.sh b/git-mergetool.sh
index 7b66309..c27d212 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -258,6 +258,15 @@ merge_file () {
 	    status=$?
 	    save_backup
 	    ;;
+	ediff)
+	    if base_present ; then
+		emacs --eval "(ediff-merge-files-with-ancestor \"$LOCAL\" \"$REMOTE\" \"$BASE\" \"$path\")"
+	    else
+		emacs --eval "(ediff-merge-files \"$LOCAL\" \"$REMOTE\" \"$path\")"
+	    fi
+	    status=$?
+	    save_backup
+	    ;;
     esac
     if test "$status" -ne 0; then
 	echo "merge of $path failed" 1>&2
@@ -299,7 +308,7 @@ done
 if test -z "$merge_tool"; then
     merge_tool=`git-config merge.tool`
     case "$merge_tool" in
-	kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | "")
+	kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | ediff | vimdiff | gvimdiff | "")
 	    ;; # happy
 	*)
 	    echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
@@ -320,7 +329,7 @@ if test -z "$merge_tool" ; then
         fi
     fi
     if echo "${VISUAL:-$EDITOR}" | grep 'emacs' > /dev/null 2>&1; then
-        merge_tool_candidates="$merge_tool_candidates emerge"
+        merge_tool_candidates="$merge_tool_candidates emerge ediff"
     fi
     if echo "${VISUAL:-$EDITOR}" | grep 'vim' > /dev/null 2>&1; then
         merge_tool_candidates="$merge_tool_candidates vimdiff"
@@ -328,7 +337,7 @@ if test -z "$merge_tool" ; then
     merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
     echo "merge tool candidates: $merge_tool_candidates"
     for i in $merge_tool_candidates; do
-        if test $i = emerge ; then
+        if test $i = emerge -o $i = ediff ; then
             cmd=emacs
         else
             cmd=$i
@@ -351,7 +360,7 @@ case "$merge_tool" in
 	    exit 1
 	fi
 	;;
-    emerge)
+    emerge|ediff)
 	if ! type "emacs" > /dev/null 2>&1; then
 	    echo "Emacs is not available"
 	    exit 1
--
1.5.2.2.589.g4b646