While working on a repository, it's often helpful to stash the changes
of a single or multiple files, and leave others alone.  Unfortunately
git currently offers no such option.  git stash -p can be used to work
around this, but it's often impractical when there are a lot of changes
over multiple files.

Add an optional filename argument to git stash push, which allows for
stashing a single (or multiple) files.

Signed-off-by: Thomas Gummerer <t.gumme...@gmail.com>
---
 Documentation/git-stash.txt |  9 +++++++++
 git-stash.sh                | 30 +++++++++++++++++++++++-------
 t/t3903-stash.sh            | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 74 insertions(+), 7 deletions(-)

diff --git a/Documentation/git-stash.txt b/Documentation/git-stash.txt
index 0bce33e3fc..8306bac397 100644
--- a/Documentation/git-stash.txt
+++ b/Documentation/git-stash.txt
@@ -15,9 +15,13 @@ SYNOPSIS
 'git stash' branch <branchname> [<stash>]
 'git stash' [save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]
             [-u|--include-untracked] [-a|--all] [<message>]]
+'git stash' push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]
+            [-u|--include-untracked] [-a|--all] [-m|--message <message>]]
+            [--] [<paths>...]
 'git stash' clear
 'git stash' create [<message>]
 'git stash' create [-m <message>] [-u|--include-untracked <untracked|all>]
+            [-- <paths>...]
 'git stash' store [-m|--message <message>] [-q|--quiet] <commit>
 
 DESCRIPTION
@@ -47,6 +51,7 @@ OPTIONS
 -------
 
 save [-p|--patch] [-k|--[no-]keep-index] [-u|--include-untracked] [-a|--all] 
[-q|--quiet] [<message>]::
+push [-p|--patch] [-k|--[no-]keep-index] [-u|--include-untracked] [-a|--all] 
[-q|--quiet] [-m|--message <message>] [--] [<paths>...]::
 
        Save your local modifications to a new 'stash' and roll them
        back both in the working tree and in the index.
@@ -56,6 +61,10 @@ save [-p|--patch] [-k|--[no-]keep-index] 
[-u|--include-untracked] [-a|--all] [-q
        only <message> does not trigger this action to prevent a misspelled
        subcommand from making an unwanted stash.
 +
+If the paths argument is given in 'git stash push', only these files
+are put in the new 'stash'.  In addition only the indicated files are
+changed in the working tree to match the index.
++
 If the `--keep-index` option is used, all changes already added to the
 index are left intact.
 +
diff --git a/git-stash.sh b/git-stash.sh
index 5f08b43967..0072a38b4c 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -41,7 +41,7 @@ no_changes () {
 untracked_files () {
        excl_opt=--exclude-standard
        test "$untracked" = "all" && excl_opt=
-       git ls-files -o -z $excl_opt
+       git ls-files -o -z $excl_opt -- $1
 }
 
 clear_stash () {
@@ -59,6 +59,7 @@ create_stash () {
        stash_msg=
        untracked=
        new_style=
+       files=
        while test $# != 0
        do
                case "$1" in
@@ -72,6 +73,12 @@ create_stash () {
                        untracked="$1"
                        new_style=t
                        ;;
+               --)
+                       shift
+                       files="$@"
+                       new_style=t
+                       break
+                       ;;
                *)
                        if test -n "$new_style"
                        then
@@ -134,7 +141,7 @@ create_stash () {
                # Untracked files are stored by themselves in a parentless 
commit, for
                # ease of unpacking later.
                u_commit=$(
-                       untracked_files | (
+                       untracked_files $files | (
                                GIT_INDEX_FILE="$TMPindex" &&
                                export GIT_INDEX_FILE &&
                                rm -f "$TMPindex" &&
@@ -157,7 +164,7 @@ create_stash () {
                        git read-tree --index-output="$TMPindex" -m $i_tree &&
                        GIT_INDEX_FILE="$TMPindex" &&
                        export GIT_INDEX_FILE &&
-                       git diff-index --name-only -z HEAD -- 
>"$TMP-stagenames" &&
+                       git diff-index --name-only -z HEAD -- $files 
>"$TMP-stagenames" &&
                        git update-index -z --add --remove --stdin 
<"$TMP-stagenames" &&
                        git write-tree &&
                        rm -f "$TMPindex"
@@ -171,7 +178,7 @@ create_stash () {
 
                # find out what the user wants
                GIT_INDEX_FILE="$TMP-index" \
-                       git add--interactive --patch=stash -- &&
+                       git add--interactive --patch=stash -- $files &&
 
                # state of the working tree
                w_tree=$(GIT_INDEX_FILE="$TMP-index" git write-tree) ||
@@ -293,6 +300,8 @@ push_stash () {
                shift
        done
 
+       files="$*"
+
        if test -n "$patch_mode" && test -n "$untracked"
        then
                die "$(gettext "Can't use --patch and --include-untracked or 
--all at the same time")"
@@ -307,18 +316,25 @@ push_stash () {
        git reflog exists $ref_stash ||
                clear_stash || die "$(gettext "Cannot initialize stash")"
 
-       create_stash -m "$stash_msg" -u "$untracked"
+       create_stash -m "$stash_msg" -u "$untracked" -- $files
        store_stash -m "$stash_msg" -q $w_commit ||
        die "$(gettext "Cannot save the current status")"
        say "$(eval_gettext "Saved working directory and index state 
\$stash_msg")"
 
        if test -z "$patch_mode"
        then
-               git reset --hard ${GIT_QUIET:+-q}
+               if test -n "$files"
+               then
+                       git ls-files -z -- "$@" | xargs -0 git reset --
+                       git ls-files -z --modified -- "$@" | xargs -0 git 
checkout HEAD --
+                       git ls-files -z --others -- "$@" | xargs -0 git clean 
--force --
+               else
+                       git reset --hard ${GIT_QUIET:+-q}
+               fi
                test "$untracked" = "all" && CLEAN_X_OPTION=-x || 
CLEAN_X_OPTION=
                if test -n "$untracked"
                then
-                       git clean --force --quiet -d $CLEAN_X_OPTION
+                       git clean --force --quiet -d $CLEAN_X_OPTION -- $files
                fi
 
                if test "$keep_index" = "t" && test -n "$i_tree"
diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 34e9610bb6..ca4c44aa9c 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -802,4 +802,46 @@ test_expect_success 'new style stash create stores correct 
message' '
        test_cmp expect actual
 '
 
+test_expect_success 'stash -- <filename> stashes and restores the file' '
+       >foo &&
+       >bar &&
+       git add foo bar &&
+       git stash push -- foo &&
+       test_path_is_file bar &&
+       test_path_is_missing foo &&
+       git stash pop &&
+       test_path_is_file foo &&
+       test_path_is_file bar
+'
+
+test_expect_success 'stash with multiple filename arguments' '
+       >foo &&
+       >bar &&
+       >extra &&
+       git add foo bar extra &&
+       git stash push -- foo bar &&
+       test_path_is_missing bar &&
+       test_path_is_missing foo &&
+       test_path_is_file extra &&
+       git stash pop &&
+       test_path_is_file foo &&
+       test_path_is_file bar &&
+       test_path_is_file extra
+'
+
+test_expect_success 'stash with file including $IFS character' '
+       >"foo   bar" &&
+       >foo &&
+       >untracked &&
+       git add foo* &&
+       git stash push -- foo* &&
+       test_path_is_missing "foo       bar" &&
+       test_path_is_missing foo &&
+       test_path_is_file untracked &&
+       git stash pop &&
+       test_path_is_file "foo  bar" &&
+       test_path_is_file foo &&
+       test_path_is_file untracked
+'
+
 test_done
-- 
2.11.0.297.g9a2118ac0b.dirty

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