Merge branch 'cb/mergetool'

* cb/mergetool:
  mergetool: Don't keep temporary merge files unless told to
  mergetool: Add prompt to continue after failing to merge a file
  Add -y/--no-prompt option to mergetool
  Fix some tab/space inconsistencies in git-mergetool.sh

Documentation/config.txt

@@ -1044,6 +1044,16 @@ mergetool.keepBackup::
 	is set to `false` then this file is not preserved.  Defaults to
 	`true` (i.e. keep the backup files).
 
+mergetool.keepTemporaries::
+	When invoking a custom merge tool, git uses a set of temporary
+	files to pass to the tool. If the tool returns an error and this
+	variable is set to `true`, then these temporary files will be
+	preserved, otherwise they will be removed after the tool has
+	exited. Defaults to `false`.
+
+mergetool.prompt::
+	Prompt before each invocation of the merge resolution program.
+
 pack.window::
 	The size of the window used by linkgit:git-pack-objects[1] when no
 	window size is given on the command line. Defaults to 10.

Documentation/git-mergetool.txt

@@ -7,7 +7,7 @@ git-mergetool - Run merge conflict resolution tools to resolve merge conflicts
 
 SYNOPSIS
 --------
-'git mergetool' [--tool=<tool>] [<file>]...
+'git mergetool' [--tool=<tool>] [-y|--no-prompt|--prompt] [<file>]...
 
 DESCRIPTION
 -----------
@@ -60,6 +60,15 @@ variable `mergetool.<tool>.trustExitCode` can be set to `true`.
 Otherwise, 'git-mergetool' will prompt the user to indicate the
 success of the resolution after the custom tool has exited.
 
+-y or --no-prompt::
+	Don't prompt before each invocation of the merge resolution
+	program.
+
+--prompt::
+	Prompt before each invocation of the merge resolution program.
+	This is the default behaviour; the option is provided to
+	override any configuration settings.
+
 Author
 ------
 Written by Theodore Y Ts'o <tytso@mit.edu>

git-mergetool.sh

@@ -8,7 +8,7 @@
 # at the discretion of Junio C Hamano.
 #
 
-USAGE='[--tool=tool] [file to merge] ...'
+USAGE='[--tool=tool] [-y|--no-prompt|--prompt] [file to merge] ...'
 SUBDIRECTORY_OK=Yes
 OPTIONS_SPEC=
 . git-sh-setup
@@ -70,16 +70,16 @@ resolve_symlink_merge () {
 		git checkout-index -f --stage=2 -- "$MERGED"
 		git add -- "$MERGED"
 		cleanup_temp_files --save-backup
-		return
+		return 0
 		;;
 	    [rR]*)
 		git checkout-index -f --stage=3 -- "$MERGED"
 		git add -- "$MERGED"
 		cleanup_temp_files --save-backup
-		return
+		return 0
 		;;
 	    [aA]*)
-		exit 1
+		return 1
 		;;
 	    esac
 	done
@@ -97,15 +97,15 @@ resolve_deleted_merge () {
 	    [mMcC]*)
 		git add -- "$MERGED"
 		cleanup_temp_files --save-backup
-		return
+		return 0
 		;;
 	    [dD]*)
 		git rm -- "$MERGED" > /dev/null
 		cleanup_temp_files
-		return
+		return 0
 		;;
 	    [aA]*)
-		exit 1
+		return 1
 		;;
 	    esac
 	done
@@ -137,7 +137,7 @@ merge_file () {
 	else
 	    echo "$MERGED: file does not need merging"
 	fi
-	exit 1
+	return 1
     fi
 
     ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
@@ -176,8 +176,10 @@ merge_file () {
     echo "Normal merge conflict for '$MERGED':"
     describe_file "$local_mode" "local" "$LOCAL"
     describe_file "$remote_mode" "remote" "$REMOTE"
+    if "$prompt" = true; then
 	printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
 	read ans
+    fi
 
     case "$merge_tool" in
 	kdiff3)
@@ -267,7 +269,12 @@ merge_file () {
     if test "$status" -ne 0; then
 	echo "merge of $MERGED failed" 1>&2
 	mv -- "$BACKUP" "$MERGED"
-	exit 1
+
+	if test "$merge_keep_temporaries" = "false"; then
+	    cleanup_temp_files
+	fi
+
+	return 1
     fi
 
     if test "$merge_keep_backup" = "true"; then
@@ -278,8 +285,11 @@ merge_file () {
 
     git add -- "$MERGED"
     cleanup_temp_files
+    return 0
 }
 
+prompt=$(git config --bool mergetool.prompt || echo true)
+
 while test $# != 0
 do
     case "$1" in
@@ -295,6 +305,12 @@ do
 		    shift ;;
 	    esac
 	    ;;
+	-y|--no-prompt)
+	    prompt=false
+	    ;;
+	--prompt)
+	    prompt=true
+	    ;;
 	--)
 	    shift
 	    break
@@ -341,6 +357,22 @@ init_merge_tool_path() {
 	fi
 }
 
+prompt_after_failed_merge() {
+    while true; do
+	printf "Continue merging other unresolved paths (y/n) ? "
+	read ans
+	case "$ans" in
+
+	    [yY]*)
+		return 0
+		;;
+
+	    [nN]*)
+		return 1
+		;;
+	esac
+    done
+}
 
 if test -z "$merge_tool"; then
     merge_tool=`git config merge.tool`
@@ -389,6 +421,7 @@ else
     init_merge_tool_path "$merge_tool"
 
     merge_keep_backup="$(git config --bool merge.keepBackup || echo true)"
+    merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
 
     if test -z "$merge_tool_cmd" && ! type "$merge_tool_path" > /dev/null 2>&1; then
         echo "The merge tool $merge_tool is not available as '$merge_tool_path'"
@@ -400,6 +433,8 @@ else
     fi
 fi
 
+last_status=0
+rollup_status=0
 
 if test $# -eq 0 ; then
     files=`git ls-files -u | sed -e 's/^[^	]*	//' | sort -u`
@@ -413,14 +448,29 @@ if test $# -eq 0 ; then
     sort -u |
     while IFS= read i
     do
+	if test $last_status -ne 0; then
+	    prompt_after_failed_merge < /dev/tty || exit 1
+	fi
 	printf "\n"
 	merge_file "$i" < /dev/tty > /dev/tty
+	last_status=$?
+	if test $last_status -ne 0; then
+	    rollup_status=1
+	fi
     done
 else
     while test $# -gt 0; do
+	if test $last_status -ne 0; then
+	    prompt_after_failed_merge || exit 1
+	fi
 	printf "\n"
 	merge_file "$1"
+	last_status=$?
+	if test $last_status -ne 0; then
+	    rollup_status=1
+	fi
 	shift
     done
 fi
-exit 0
+
+exit $rollup_status