[PATCH v2] mergetools: add winmerge as a builtin tool

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Add a winmerge scriptlet with the commands described in [1] so
that users can use winmerge without needing to perform any
additional configuration.

[1] http://thread.gmane.org/gmane.comp.version-control.git/268631

Helped-by: Philip Oakley <philipoakley@xxxxxxx>
Helped-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
Signed-off-by: David Aguilar <davvid@xxxxxxxxx>
---

Changes since v1: we now honor the $ProgramW6432 environment variable.

 mergetools/winmerge | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 mergetools/winmerge

diff --git a/mergetools/winmerge b/mergetools/winmerge
new file mode 100644
index 0000000..db0b060
--- /dev/null
+++ b/mergetools/winmerge
@@ -0,0 +1,40 @@
+diff_cmd () {
+	"$merge_tool_path" -u -e "$LOCAL" "$REMOTE"
+	return 0
+}
+
+merge_cmd () {
+	# mergetool.winmerge.trustExitCode is implicitly false.
+	# touch $BACKUP so that we can check_unchanged.
+	touch "$BACKUP"
+	"$merge_tool_path" -u -e -dl Local -dr Remote \
+		"$LOCAL" "$REMOTE" "$MERGED"
+	check_unchanged
+}
+
+translate_merge_tool_path() {
+	# Use WinMergeU.exe if it exists in $PATH
+	if type WinMergeU.exe >/dev/null 2>&1
+	then
+		echo WinMergeU.exe
+		return
+	fi
+
+	# Look for WinMergeU.exe in the typical locations
+	winmerge_exe="WinMerge/WinMergeU.exe"
+	if test -n "$ProgramW6432" && test -x "$ProgramW6432/$winmerge_exe"
+	then
+		printf '%s' "$ProgramW6432/$winmerge_exe"
+	elif test -n "$PROGRAMFILES" && test -x "$PROGRAMFILES/$winmerge_exe"
+	then
+		printf '%s' "$PROGRAMFILES/$winmerge_exe"
+	elif test -x "/c/Program Files (x86)/$winmerge_exe"
+	then
+		printf '%s' "/c/Program Files (x86)/$winmerge_exe"
+	elif test -x "/c/Program Files/$winmerge_exe"
+	then
+		printf '%s' "/c/Program Files/$winmerge_exe"
+	else
+		echo WinMergeU.exe
+	fi
+}
-- 
1.8.5.3

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