Instead of referencing "stash@{n}" explicitly, it can simply be
referenced as "n".  Most users only reference stashes by their position
in the stash stask (what I refer to as the "index"). The syntax for the
typical stash (stash@{n}) is slightly annoying and easy to forget, and
sometimes difficult to escape properly in a script. Because of this the
capability to do things with the stash by simply referencing the index
is desirable.

This patch includes the superior implementation provided by Ă˜sse Walle
(thanks for that), with a slight change to fix a broken test in the test
suite. I also merged the test scripts as suggested by Jeff King, and
un-wrapped the documentation as suggested by Junio Hamano.

Signed-off-by: Aaron M Watson <watso...@gmail.com>
---
 Documentation/git-stash.txt |  3 ++-
 git-stash.sh                | 17 +++++++++++++++--
 t/t3903-stash.sh            | 35 +++++++++++++++++++++++++++++++++++
 3 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/Documentation/git-stash.txt b/Documentation/git-stash.txt
index 92df596..2e9cef0 100644
--- a/Documentation/git-stash.txt
+++ b/Documentation/git-stash.txt
@@ -39,7 +39,8 @@ The latest stash you created is stored in `refs/stash`; older
 stashes are found in the reflog of this reference and can be named using
 the usual reflog syntax (e.g. `stash@{0}` is the most recently
 created stash, `stash@{1}` is the one before it, `stash@{2.hours.ago}`
-is also possible).
+is also possible). Stashes may also be referenced by specifying just the
+stash index (e.g. the integer `n` is equivalent to `stash@{n}`).
 
 OPTIONS
 -------
diff --git a/git-stash.sh b/git-stash.sh
index 826af18..d8d3b8d 100755
--- a/git-stash.sh
+++ b/git-stash.sh
@@ -384,9 +384,10 @@ parse_flags_and_rev()
        i_tree=
        u_tree=
 
-       REV=$(git rev-parse --no-flags --symbolic --sq "$@") || exit 1
+       REV=$(git rev-parse --no-flags --symbolic --sq "$@" 2> /dev/null)
 
        FLAGS=
+       ARGV=
        for opt
        do
                case "$opt" in
@@ -404,10 +405,13 @@ parse_flags_and_rev()
                                        die "$(eval_gettext "unknown option: 
\$opt")"
                                FLAGS="${FLAGS}${FLAGS:+ }$opt"
                        ;;
+                       *)
+                               ARGV="${ARGV}${ARGV:+ }'$opt'"
+                       ;;
                esac
        done
 
-       eval set -- $REV
+       eval set -- $ARGV
 
        case $# in
                0)
@@ -422,6 +426,15 @@ parse_flags_and_rev()
                ;;
        esac
 
+       case "$1" in
+               *[!0-9]*)
+                       :
+               ;;
+               *)
+                       set -- "${ref_stash}@{$1}"
+               ;;
+       esac
+
        REV=$(git rev-parse --symbolic --verify --quiet "$1") || {
                reference="$1"
                die "$(eval_gettext "\$reference is not a valid reference")"
diff --git a/t/t3903-stash.sh b/t/t3903-stash.sh
index 2142c1f..f82a8c4 100755
--- a/t/t3903-stash.sh
+++ b/t/t3903-stash.sh
@@ -131,6 +131,26 @@ test_expect_success 'drop middle stash' '
        test 1 = $(git show HEAD:file)
 '
 
+test_expect_success 'drop middle stash by index' '
+       git reset --hard &&
+       echo 8 > file &&
+       git stash &&
+       echo 9 > file &&
+       git stash &&
+       git stash drop 1 &&
+       test 2 = $(git stash list | wc -l) &&
+       git stash apply &&
+       test 9 = $(cat file) &&
+       test 1 = $(git show :file) &&
+       test 1 = $(git show HEAD:file) &&
+       git reset --hard &&
+       git stash drop &&
+       git stash apply &&
+       test 3 = $(cat file) &&
+       test 1 = $(git show :file) &&
+       test 1 = $(git show HEAD:file)
+'
+
 test_expect_success 'stash pop' '
        git reset --hard &&
        git stash pop &&
@@ -604,6 +624,21 @@ test_expect_success 'invalid ref of the form stash@{n}, n 
>= N' '
        git stash drop
 '
 
+test_expect_success 'invalid ref of the form "n", n >= N' '
+       git stash clear &&
+       test_must_fail git stash drop 0 &&
+       echo bar5 > file &&
+       echo bar6 > file2 &&
+       git add file2 &&
+       git stash &&
+       test_must_fail git stash drop 1 &&
+       test_must_fail git stash pop 1 &&
+       test_must_fail git stash apply 1 &&
+       test_must_fail git stash show 1 &&
+       test_must_fail git stash branch tmp 1 &&
+       git stash drop
+'
+
 test_expect_success 'stash branch should not drop the stash if the branch 
exists' '
        git stash clear &&
        echo foo >file &&
-- 
2.7.4

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