1 files changed, 97 insertions, 0 deletions
diff --git a/mergetools/meld b/mergetools/meld
new file mode 100644
index 0000000..8ec0867
--- /dev/null
+++ b/mergetools/meld
@@ -0,0 +1,97 @@
+diff_cmd () {
+	"$merge_tool_path" "$LOCAL" "$REMOTE"
+}
+
+diff_cmd_help () {
+	echo "Use Meld (requires a graphical session)"
+}
+
+merge_cmd () {
+	check_meld_for_features
+
+	option_auto_merge=
+	if test "$meld_use_auto_merge_option" = true
+	then
+		option_auto_merge="--auto-merge"
+	fi
+
+	if test "$meld_has_output_option" = true
+	then
+		"$merge_tool_path" $option_auto_merge --output="$MERGED" \
+			"$LOCAL" "$BASE" "$REMOTE"
+	else
+		"$merge_tool_path" $option_auto_merge "$LOCAL" "$MERGED" "$REMOTE"
+	fi
+}
+
+merge_cmd_help () {
+	echo "Use Meld (requires a graphical session) with optional \`auto merge\` (see \`git help mergetool\`'s \`CONFIGURATION\` section)"
+}
+
+# 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
+}
+
+# Check the features and set flags
+check_meld_for_features () {
+	# Check whether we should use 'meld --output <file>'
+	if test -z "$meld_has_output_option"
+	then
+		meld_has_output_option=$(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 "$meld_use_auto_merge_option"
+	then
+		meld_use_auto_merge_option=$(
+			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
+}