[PATCH v2 1/2] Refactor vimdiff and bc merge tool variants

[pudinha <rogi@skylittlesystem.org>]

The merge tools vimdiff2, vimdiff3, gvimdiff2, gvimdiff3 and bc3 are all
variants of the main tools vimdiff and bc. They are implemented in the
main and a one-liner script that just sources it exist for each.

This patch allows variants ending in [0-9] to be correctly wired without
the need for such one-liners, so instead of 5 scripts, only 1 (gvimdiff)
is needed.
---
 git-mergetool--lib.sh | 28 +++++++++++++++++++++++-----
 mergetools/bc         |  5 +++++
 mergetools/bc3        |  1 -
 mergetools/gvimdiff2  |  1 -
 mergetools/gvimdiff3  |  1 -
 mergetools/vimdiff    |  8 ++++++++
 mergetools/vimdiff2   |  1 -
 mergetools/vimdiff3   |  1 -
 8 files changed, 36 insertions(+), 10 deletions(-)
 delete mode 100644 mergetools/bc3
 delete mode 100644 mergetools/gvimdiff2
 delete mode 100644 mergetools/gvimdiff3
 delete mode 100644 mergetools/vimdiff2
 delete mode 100644 mergetools/vimdiff3

diff --git a/git-mergetool--lib.sh b/git-mergetool--lib.sh
index 204a5acd66..29fecc340f 100644
--- a/git-mergetool--lib.sh
+++ b/git-mergetool--lib.sh
@@ -43,7 +43,14 @@ show_tool_names () {
 
 	shown_any=
 	( cd "$MERGE_TOOLS_DIR" && ls ) | {
-		while read toolname
+		while read scriptname
+		do
+			setup_tool "$scriptname" 2>/dev/null
+			variants="$variants$(list_tool_variants)\n"
+		done
+		variants="$(echo "$variants" | sort | uniq)"
+
+		for toolname in $variants
 		do
 			if setup_tool "$toolname" 2>/dev/null &&
 				(eval "$condition" "$toolname")
@@ -157,6 +164,10 @@ setup_tool () {
 		echo "$1"
 	}
 
+	list_tool_variants () {
+		echo "$tool"
+	}
+
 	# Most tools' exit codes cannot be trusted, so By default we ignore
 	# their exit code and check the merged file's modification time in
 	# check_unchanged() to determine whether or not the merge was
@@ -178,19 +189,26 @@ setup_tool () {
 		false
 	}
 
-
-	if ! test -f "$MERGE_TOOLS_DIR/$tool"
+	if test -f "$MERGE_TOOLS_DIR/$tool"
 	then
+		. "$MERGE_TOOLS_DIR/$tool"
+	elif test -f "$MERGE_TOOLS_DIR/${tool%[0-9]}"
+	then
+		. "$MERGE_TOOLS_DIR/${tool%[0-9]}"
+	else
 		setup_user_tool
 		return $?
 	fi
 
-	# Load the redefined functions
-	. "$MERGE_TOOLS_DIR/$tool"
 	# Now let the user override the default command for the tool.  If
 	# they have not done so then this will return 1 which we ignore.
 	setup_user_tool
 
+	if ! list_tool_variants | grep -q "^$tool$"
+	then
+		return 1
+	fi
+
 	if merge_mode && ! can_merge
 	then
 		echo "error: '$tool' can not be used to resolve merges" >&2
diff --git a/mergetools/bc b/mergetools/bc
index 3a69e60faa..a89086ee72 100644
--- a/mergetools/bc
+++ b/mergetools/bc
@@ -21,3 +21,8 @@ translate_merge_tool_path() {
 		echo bcompare
 	fi
 }
+
+list_tool_variants () {
+	echo bc
+	echo bc3
+}
diff --git a/mergetools/bc3 b/mergetools/bc3
deleted file mode 100644
index 5d8dd48184..0000000000
--- a/mergetools/bc3
+++ /dev/null
@@ -1 +0,0 @@
-. "$MERGE_TOOLS_DIR/bc"
diff --git a/mergetools/gvimdiff2 b/mergetools/gvimdiff2
deleted file mode 100644
index 04a5bb0ea8..0000000000
--- a/mergetools/gvimdiff2
+++ /dev/null
@@ -1 +0,0 @@
-. "$MERGE_TOOLS_DIR/vimdiff"
diff --git a/mergetools/gvimdiff3 b/mergetools/gvimdiff3
deleted file mode 100644
index 04a5bb0ea8..0000000000
--- a/mergetools/gvimdiff3
+++ /dev/null
@@ -1 +0,0 @@
-. "$MERGE_TOOLS_DIR/vimdiff"
diff --git a/mergetools/vimdiff b/mergetools/vimdiff
index 10d86f3e19..3925e1fc3e 100644
--- a/mergetools/vimdiff
+++ b/mergetools/vimdiff
@@ -46,3 +46,11 @@ translate_merge_tool_path() {
 exit_code_trustable () {
 	true
 }
+
+list_tool_variants () {
+	for prefix in '' g; do
+		for suffix in '' 2 3; do
+			echo "${prefix}vimdiff${suffix}"
+		done
+	done
+}
diff --git a/mergetools/vimdiff2 b/mergetools/vimdiff2
deleted file mode 100644
index 04a5bb0ea8..0000000000
--- a/mergetools/vimdiff2
+++ /dev/null
@@ -1 +0,0 @@
-. "$MERGE_TOOLS_DIR/vimdiff"
diff --git a/mergetools/vimdiff3 b/mergetools/vimdiff3
deleted file mode 100644
index 04a5bb0ea8..0000000000
--- a/mergetools/vimdiff3
+++ /dev/null
@@ -1 +0,0 @@
-. "$MERGE_TOOLS_DIR/vimdiff"
-- 
2.27.0