Merge branch 'js/mergetool-optim'

"git mergetool" and its tests now spawn fewer subprocesses.

* js/mergetool-optim:
  mergetool: use shell variable magic instead of `awk`
  mergetool: dissect strings with shell variable magic instead of `expr`
  t7610-mergetool: use test_cmp instead of test $(cat file) = $txt
  t7610-mergetool: do not place pipelines headed by `yes` in subshells

git-mergetool.sh

@@ -228,9 +228,8 @@ stage_submodule () {
 }
 
 checkout_staged_file () {
-	tmpfile=$(expr \
-		"$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" \
-		: '\([^	]*\)	')
+	tmpfile="$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" &&
+	tmpfile=${tmpfile%%'	'*}
 
 	if test $? -eq 0 && test -n "$tmpfile"
 	then
@@ -255,13 +254,16 @@ merge_file () {
 		return 1
 	fi
 
-	if BASE=$(expr "$MERGED" : '\(.*\)\.[^/]*$')
-	then
-		ext=$(expr "$MERGED" : '.*\(\.[^/]*\)$')
-	else
+	# extract file extension from the last path component
+	case "${MERGED##*/}" in
+	*.*)
+		ext=.${MERGED##*.}
+		BASE=${MERGED%"$ext"}
+		;;
+	*)
 		BASE=$MERGED
 		ext=
-	fi
+	esac
 
 	mergetool_tmpdir_init
 
@@ -277,15 +279,30 @@ merge_file () {
 	REMOTE="$MERGETOOL_TMPDIR/${BASE}_REMOTE_$$$ext"
 	BASE="$MERGETOOL_TMPDIR/${BASE}_BASE_$$$ext"
 
-	base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
-	local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')
-	remote_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}')
+	base_mode= local_mode= remote_mode=
+
+	# here, $IFS is just a LF
+	for line in $f
+	do
+		mode=${line%% *}		# 1st word
+		sha1=${line#"$mode "}
+		sha1=${sha1%% *}		# 2nd word
+		case "${line#$mode $sha1 }" in	# remainder
+		'1	'*)
+			base_mode=$mode
+			;;
+		'2	'*)
+			local_mode=$mode local_sha1=$sha1
+			;;
+		'3	'*)
+			remote_mode=$mode remote_sha1=$sha1
+			;;
+		esac
+	done
 
 	if is_submodule "$local_mode" || is_submodule "$remote_mode"
 	then
 		echo "Submodule merge conflict for '$MERGED':"
-		local_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $2;}')
-		remote_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $2;}')
 		describe_file "$local_mode" "local" "$local_sha1"
 		describe_file "$remote_mode" "remote" "$remote_sha1"
 		resolve_submodule_merge
@@ -406,7 +423,7 @@ main () {
 		-t|--tool*)
 			case "$#,$1" in
 			*,*=*)
-				merge_tool=$(expr "z$1" : 'z-[^=]*=\(.*\)')
+				merge_tool=${1#*=}
 				;;
 			1,*)
 				usage ;;