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-rw-r--r--third_party/git/mergetools/bc5
-rw-r--r--third_party/git/mergetools/bc31
-rw-r--r--third_party/git/mergetools/gvimdiff31
-rw-r--r--third_party/git/mergetools/meld85
-rw-r--r--third_party/git/mergetools/nvimdiff (renamed from third_party/git/mergetools/gvimdiff2)0
-rw-r--r--third_party/git/mergetools/vimdiff21
-rw-r--r--third_party/git/mergetools/vimdiff21
-rw-r--r--third_party/git/mergetools/vimdiff31
8 files changed, 90 insertions, 25 deletions
diff --git a/third_party/git/mergetools/bc b/third_party/git/mergetools/bc
index 3a69e60faa9c..a89086ee720f 100644
--- a/third_party/git/mergetools/bc
+++ b/third_party/git/mergetools/bc
@@ -21,3 +21,8 @@ translate_merge_tool_path() {
 		echo bcompare
 	fi
 }
+
+list_tool_variants () {
+	echo bc
+	echo bc3
+}
diff --git a/third_party/git/mergetools/bc3 b/third_party/git/mergetools/bc3
deleted file mode 100644
index 5d8dd4818488..000000000000
--- a/third_party/git/mergetools/bc3
+++ /dev/null
@@ -1 +0,0 @@
-. "$MERGE_TOOLS_DIR/bc"
diff --git a/third_party/git/mergetools/gvimdiff3 b/third_party/git/mergetools/gvimdiff3
deleted file mode 100644
index 04a5bb0ea848..000000000000
--- a/third_party/git/mergetools/gvimdiff3
+++ /dev/null
@@ -1 +0,0 @@
-. "$MERGE_TOOLS_DIR/vimdiff"
diff --git a/third_party/git/mergetools/meld b/third_party/git/mergetools/meld
index 7a08470f8836..aab4ebb9355a 100644
--- a/third_party/git/mergetools/meld
+++ b/third_party/git/mergetools/meld
@@ -3,34 +3,87 @@ diff_cmd () {
 }
 
 merge_cmd () {
-	if test -z "${meld_has_output_option:+set}"
+	check_meld_for_features
+
+	option_auto_merge=
+	if test "$meld_use_auto_merge_option" = true
 	then
-		check_meld_for_output_version
+		option_auto_merge="--auto-merge"
 	fi
 
 	if test "$meld_has_output_option" = true
 	then
-		"$merge_tool_path" --output="$MERGED" \
+		"$merge_tool_path" $option_auto_merge --output="$MERGED" \
 			"$LOCAL" "$BASE" "$REMOTE"
 	else
-		"$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
+		"$merge_tool_path" $option_auto_merge "$LOCAL" "$MERGED" "$REMOTE"
 	fi
 }
 
-# Check whether we should use 'meld --output <file>'
-check_meld_for_output_version () {
-	meld_path="$(git config mergetool.meld.path)"
-	meld_path="${meld_path:-meld}"
+# Get meld help message
+init_meld_help_msg () {
+	if test -z "$meld_help_msg"
+	then
+		meld_path="$(git config mergetool.meld.path || echo meld)"
+		meld_help_msg=$("$meld_path" --help 2>&1)
+	fi
+}
 
-	if meld_has_output_option=$(git config --bool mergetool.meld.hasOutput)
+# Check the features and set flags
+check_meld_for_features () {
+	# Check whether we should use 'meld --output <file>'
+	if test -z "$meld_has_output_option"
 	then
-		: use configured value
-	elif "$meld_path" --help 2>&1 |
-		grep -e '--output=' -e '\[OPTION\.\.\.\]' >/dev/null
+		meld_has_output_option=$(git config --bool mergetool.meld.hasOutput)
+		case "$meld_has_output_option" in
+		true | false)
+			: use configured value
+			;;
+		*)
+			: empty or invalid configured value, detecting "--output" automatically
+			init_meld_help_msg
+
+			case "$meld_help_msg" in
+			*"--output="* | *'[OPTION...]'*)
+				# All version that has [OPTION...] supports --output
+				meld_has_output_option=true
+				;;
+			*)
+				meld_has_output_option=false
+				;;
+			esac
+			;;
+		esac
+	fi
+	# Check whether we should use 'meld --auto-merge ...'
+	if test -z "$meld_use_auto_merge_option"
 	then
-		: old ones mention --output and new ones just say OPTION...
-		meld_has_output_option=true
-	else
-		meld_has_output_option=false
+		meld_use_auto_merge_option=$(
+			git config --bool-or-str mergetool.meld.useAutoMerge
+		)
+		case "$meld_use_auto_merge_option" in
+		true | false)
+			: use well formatted boolean value
+			;;
+		auto)
+			# testing the "--auto-merge" option only if config is "auto"
+			init_meld_help_msg
+
+			case "$meld_help_msg" in
+			*"--auto-merge"* | *'[OPTION...]'*)
+				meld_use_auto_merge_option=true
+				;;
+			*)
+				meld_use_auto_merge_option=false
+				;;
+			esac
+			;;
+		"")
+			meld_use_auto_merge_option=false
+			;;
+		*)
+			die "unknown mergetool.meld.useAutoMerge: $meld_use_auto_merge_option"
+			;;
+		esac
 	fi
 }
diff --git a/third_party/git/mergetools/gvimdiff2 b/third_party/git/mergetools/nvimdiff
index 04a5bb0ea848..04a5bb0ea848 100644
--- a/third_party/git/mergetools/gvimdiff2
+++ b/third_party/git/mergetools/nvimdiff
diff --git a/third_party/git/mergetools/vimdiff b/third_party/git/mergetools/vimdiff
index 10d86f3e1930..abc8ce4ec44e 100644
--- a/third_party/git/mergetools/vimdiff
+++ b/third_party/git/mergetools/vimdiff
@@ -5,7 +5,7 @@ diff_cmd () {
 
 merge_cmd () {
 	case "$1" in
-	gvimdiff|vimdiff)
+	*vimdiff)
 		if $base_present
 		then
 			"$merge_tool_path" -f -d -c '4wincmd w | wincmd J' \
@@ -15,11 +15,11 @@ merge_cmd () {
 				"$LOCAL" "$MERGED" "$REMOTE"
 		fi
 		;;
-	gvimdiff2|vimdiff2)
+	*vimdiff2)
 		"$merge_tool_path" -f -d -c 'wincmd l' \
 			"$LOCAL" "$MERGED" "$REMOTE"
 		;;
-	gvimdiff3|vimdiff3)
+	*vimdiff3)
 		if $base_present
 		then
 			"$merge_tool_path" -f -d -c 'hid | hid | hid' \
@@ -34,10 +34,13 @@ merge_cmd () {
 
 translate_merge_tool_path() {
 	case "$1" in
-	gvimdiff|gvimdiff2|gvimdiff3)
+	nvimdiff*)
+		echo nvim
+		;;
+	gvimdiff*)
 		echo gvim
 		;;
-	vimdiff|vimdiff2|vimdiff3)
+	vimdiff*)
 		echo vim
 		;;
 	esac
@@ -46,3 +49,11 @@ translate_merge_tool_path() {
 exit_code_trustable () {
 	true
 }
+
+list_tool_variants () {
+	for prefix in '' g n; do
+		for suffix in '' 2 3; do
+			echo "${prefix}vimdiff${suffix}"
+		done
+	done
+}
diff --git a/third_party/git/mergetools/vimdiff2 b/third_party/git/mergetools/vimdiff2
deleted file mode 100644
index 04a5bb0ea848..000000000000
--- a/third_party/git/mergetools/vimdiff2
+++ /dev/null
@@ -1 +0,0 @@
-. "$MERGE_TOOLS_DIR/vimdiff"
diff --git a/third_party/git/mergetools/vimdiff3 b/third_party/git/mergetools/vimdiff3
deleted file mode 100644
index 04a5bb0ea848..000000000000
--- a/third_party/git/mergetools/vimdiff3
+++ /dev/null
@@ -1 +0,0 @@
-. "$MERGE_TOOLS_DIR/vimdiff"