Merge branch 'sg/stash-k-i'

* sg/stash-k-i:
  Documentation: tweak use case in "git stash save --keep-index"
  stash: introduce 'stash save --keep-index' option

3 files changed, 52 insertions, 6 deletions

diff --git a/Documentation/git-stash.txt b/Documentation/git-stash.txt
index 9b6b911091..e42c5eff4d 100644
--- a/Documentation/git-stash.txt
+++ b/Documentation/git-stash.txt
@@ -36,12 +36,15 @@ is also possible).
 OPTIONS
 -------
 
-save [<message>]::
+save [--keep-index] [<message>]::
 
 	Save your local modifications to a new 'stash', and run `git reset
 	--hard` to revert them.  This is the default action when no
 	subcommand is given. The <message> part is optional and gives
 	the description along with the stashed state.
++
+If the `--keep-index` option is used, all changes already added to the
+index are left intact.
 
 list [<options>]::
 
@@ -169,6 +172,24 @@ $ git stash apply
 ... continue hacking ...
 ----------------------------------------------------------------
 
+Testing partial commits::
+
+You can use `git stash save --keep-index` when you want to make two or
+more commits out of the changes in the work tree, and you want to test
+each change before committing:
++
+----------------------------------------------------------------
+... hack hack hack ...
+$ git add --patch foo            # add just first part to the index
+$ git stash save --keep-index    # save all other changes to the stash
+$ edit/build/test first part
+$ git commit foo -m 'First part' # commit fully tested change
+$ git stash pop                  # prepare to work on all other changes
+... repeat above five steps until one commit remains ...
+$ edit/build/test remaining parts
+$ git commit foo -m 'Remaining parts'
+----------------------------------------------------------------
+
 SEE ALSO
 --------
 linkgit:git-checkout[1],
diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 27332ed8b1..84a256ec54 100755
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1163,8 +1163,19 @@ _git_show ()
 _git_stash ()
 {
 	local subcommands='save list show apply clear drop pop create'
-	if [ -z "$(__git_find_subcommand "$subcommands")" ]; then
+	local subcommand="$(__git_find_subcommand "$subcommands")"
+	if [ -z "$subcommand" ]; then
 		__gitcomp "$subcommands"
+	else
+		local cur="${COMP_WORDS[COMP_CWORD]}"
+		case "$subcommand,$cur" in
+		save,--*)
+			__gitcomp "--keep-index"
+			;;
+		*)
+			COMPREPLY=()
+			;;
+		esac
 	fi
 }
 
diff --git a/git-stash.sh b/git-stash.sh
index 4938ade589..92531a2951 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -86,6 +86,13 @@ create_stash () {
 }
 
 save_stash () {
+	keep_index=
+	case "$1" in
+	--keep-index)
+		keep_index=t
+		shift
+	esac
+
 	stash_msg="$1"
 
 	if no_changes
@@ -104,6 +111,13 @@ save_stash () {
 	git update-ref -m "$stash_msg" $ref_stash $w_commit ||
 		die "Cannot save the current status"
 	printf 'Saved working directory and index state "%s"\n' "$stash_msg"
+
+	git reset --hard
+
+	if test -n "$keep_index" && test -n $i_tree
+	then
+		git read-tree --reset -u $i_tree
+	fi
 }
 
 have_stash () {
@@ -153,7 +167,8 @@ apply_stash () {
 		die "$*: no valid stashed state found"
 
 	unstashed_index_tree=
-	if test -n "$unstash_index" && test "$b_tree" != "$i_tree"
+	if test -n "$unstash_index" && test "$b_tree" != "$i_tree" &&
+			test "$c_tree" != "$i_tree"
 	then
 		git diff-tree --binary $s^2^..$s^2 | git apply --cached
 		test $? -ne 0 &&
@@ -235,7 +250,7 @@ show)
 	;;
 save)
 	shift
-	save_stash "$*" && git-reset --hard
+	save_stash "$*"
 	;;
 apply)
 	shift
@@ -268,8 +283,7 @@ pop)
 	if test $# -eq 0
 	then
 		save_stash &&
-		echo '(To restore them type "git stash apply")' &&
-		git-reset --hard
+		echo '(To restore them type "git stash apply")'
 	else
 		usage
 	fi