[PATCH] Added mergetool.kdiff3.doubledash config option

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Qt-only builds of kdiff3 (no KDE) do not support a bare '--' on the command
line. It will fail silently and mysteriously.

Signed-off-by: Patrick Higgins <patrick.higgins@xxxxxxxx>
---
 Documentation/config.txt |    6 ++++++
 git-mergetool.sh         |   11 +++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 5331b45..da40c2e 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -884,6 +884,12 @@ mergetool.<tool>.trustExitCode::
 	if the file has been updated, otherwise the user is prompted to
 	indicate the success of the merge.
 
+mergetool.kdiff3.doubledash::
+	A boolean to indicate whether or not your kdiff3 supports a '--'
+	on the command line to separate options from filenames. If you
+	built it without KDE, it probably doesn't have this support and
+	you	should set this to false.  Defaults to true.
+
 mergetool.keepBackup::
 	After performing a merge, the original file with conflict markers
 	can be saved as a file with a `.orig` extension.  If this variable
diff --git a/git-mergetool.sh b/git-mergetool.sh
index fcdec4a..57cbac0 100755
--- a/git-mergetool.sh
+++ b/git-mergetool.sh
@@ -181,12 +181,19 @@ merge_file () {
 
     case "$merge_tool" in
 	kdiff3)
+	    doubledash=`git config --bool mergetool.kdiff3.doubledash`
+	    if test "$doubledash" = "false"; then
+		double_dash=""
+	    else
+		double_dash="--"
+	    fi
+
 	    if base_present ; then
 		("$merge_tool_path" --auto --L1 "$MERGED (Base)" --L2 "$MERGED (Local)" --L3 "$MERGED (Remote)" \
-		    -o "$MERGED" -- "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
+		    -o "$MERGED" $double_dash "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
 	    else
 		("$merge_tool_path" --auto --L1 "$MERGED (Local)" --L2 "$MERGED (Remote)" \
-		    -o "$MERGED" -- "$LOCAL" "$REMOTE" > /dev/null 2>&1)
+		    -o "$MERGED" $double_dash "$LOCAL" "$REMOTE" > /dev/null 2>&1)
 	    fi
 	    status=$?
 	    ;;
-- 
1.5.6.rc2

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