[PATCH] contrib/subtree: ensure only one rev is provided

[Denton Liu]

While looking at the inline help for git-subtree.sh, I noticed that

        git subtree split --prefix=<prefix> <commit...>

was given as an option. However, it only really makes sense to provide
one revision because of the way the commits are forwarded to rev-parse
so this commit changes "<commit...>" to "<commit>" to reflect this. In
addition, it checks the arguments to ensure that only one rev is
provided for all subcommands that accept a commit.

Signed-off-by: Denton Liu <liu.den...@gmail.com>
---
 contrib/subtree/git-subtree.sh | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index 147201dc6c..868e18b9a1 100755
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -14,7 +14,7 @@ git subtree add   --prefix=<prefix> <repository> <ref>
 git subtree merge --prefix=<prefix> <commit>
 git subtree pull  --prefix=<prefix> <repository> <ref>
 git subtree push  --prefix=<prefix> <repository> <ref>
-git subtree split --prefix=<prefix> <commit...>
+git subtree split --prefix=<prefix> <commit>
 --
 h,help        show the help
 q             quiet
@@ -77,6 +77,12 @@ assert () {
        fi
 }
 
+ensure_single_rev () {
+       if test $# -ne 1
+       then
+               die "You must provide exactly one revision.  Got: '$@'"
+       fi
+}
 
 while test $# -gt 0
 do
@@ -185,6 +191,7 @@ if test "$command" != "pull" &&
 then
        revs=$(git rev-parse $default --revs-only "$@") || exit $?
        dirs=$(git rev-parse --no-revs --no-flags "$@") || exit $?
+       ensure_single_rev $revs
        if test -n "$dirs"
        then
                die "Error: Use --prefix instead of bare filenames."
@@ -716,9 +723,8 @@ cmd_add_repository () {
 }
 
 cmd_add_commit () {
-       revs=$(git rev-parse $default --revs-only "$@") || exit $?
-       set -- $revs
-       rev="$1"
+       rev=$(git rev-parse $default --revs-only "$@") || exit $?
+       ensure_single_rev $rev
 
        debug "Adding $dir as '$rev'..."
        git read-tree --prefix="$dir" $rev || exit $?
@@ -817,16 +823,10 @@ cmd_split () {
 }
 
 cmd_merge () {
-       revs=$(git rev-parse $default --revs-only "$@") || exit $?
+       rev=$(git rev-parse $default --revs-only "$@") || exit $?
+       ensure_single_rev $rev
        ensure_clean
 
-       set -- $revs
-       if test $# -ne 1
-       then
-               die "You must provide exactly one revision.  Got: '$revs'"
-       fi
-       rev="$1"
-
        if test -n "$squash"
        then
                first_split="$(find_latest_squash "$dir")"
-- 
2.20.1.522.g5f42c252e9