New --branch option to split command.

This is just a handy way to create a new branch from the newly-split subtree.

diff --git a/git-subtree.sh b/git-subtree.sh
index 825dd1dcad32fd3cac7cf0c72a9a3aeb8fe44eda..f6bdef300159327977f882208ad481b52c81105f 100755 (executable)
--- a/git-subtree.sh
+++ b/git-subtree.sh
@@ -19,15 +19,17 @@ d             show debug messages
 prefix=       the name of the subdir to split out
  options for 'split'
 annotate=     add a prefix to commit message of new commits
+b,branch=     create a new branch from the split subtree
+ignore-joins  ignore prior --rejoin commits
 onto=         try connecting new tree to an existing one
 rejoin        merge the new branch back into HEAD
-ignore-joins  ignore prior --rejoin commits
 "
 eval $(echo "$OPTS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?)
 . git-sh-setup
 require_work_tree
 
 quiet=
+branch=
 debug=
 command=
 onto=
@@ -69,6 +71,7 @@ while [ $# -gt 0 ]; do
                -d) debug=1 ;;
                --annotate) annotate="$1"; shift ;;
                --no-annotate) annotate= ;;
+               -b) branch="$1"; shift ;;
                --prefix) prefix="$1"; shift ;;
                --no-prefix) prefix= ;;
                --onto) onto="$1"; shift ;;
@@ -78,6 +81,7 @@ while [ $# -gt 0 ]; do
                --ignore-joins) ignore_joins=1 ;;
                --no-ignore-joins) ignore_joins= ;;
                --) break ;;
+               *) die "Unexpected option: $opt" ;;
        esac
 done
 
@@ -139,12 +143,21 @@ cache_set()
        echo "$newrev" >"$cachedir/$oldrev"
 }
 
+rev_exists()
+{
+       if git rev-parse "$1" >/dev/null 2>&1; then
+               return 0
+       else
+               return 1
+       fi
+}
+
 # if a commit doesn't have a parent, this might not work.  But we only want
 # to remove the parent from the rev-list, and since it doesn't exist, it won't
 # be there anyway, so do nothing in that case.
 try_remove_previous()
 {
-       if git rev-parse "$1^" >/dev/null 2>&1; then
+       if rev_exists "$1^"; then
                echo "^$1^"
        fi
 }
@@ -344,6 +357,10 @@ cmd_add()
 
 cmd_split()
 {
+       if [ -n "$branch" ] && rev_exists "refs/heads/$branch"; then
+               die "Branch '$branch' already exists."
+       fi
+
        debug "Splitting $dir..."
        cache_setup || exit $?
        
@@ -408,6 +425,11 @@ cmd_split()
                        -m "$(merge_msg $dir $latest_old $latest_new)" \
                        $latest_new >&2 || exit $?
        fi
+       if [ -n "$branch" ]; then
+               git update-ref -m 'subtree split' "refs/heads/$branch" \
+                       $latest_new "" || exit $?
+               say "Created branch '$branch'"
+       fi
        echo $latest_new
        exit 0
 }

diff --git a/todo b/todo
index 97142fa4e2cd98875bb8c31c0881401a61b4a542..f23a6d4ff2a3f256edfae486cbd083d8ef4a344a 100644 (file)
--- a/todo
+++ b/todo
@@ -3,17 +3,17 @@
 
        delete tempdir
 
-       --annotate-sometimes: only annotate if the patch also changes files
-         outside the subdir?
-
        'git subtree rejoin' option to do the same as --rejoin, eg. after a
          rebase
 
+       --prefix doesn't force the subtree correctly in merge/pull:
        "-s subtree" should be given an explicit subtree option?
-
-       --prefix doesn't force the subtree correctly in merge/pull
+               There doesn't seem to be a way to do this.  We'd have to
+               patch git-merge-subtree.  Ugh.
 
        add a 'push' subcommand to parallel 'pull'
+       
+       add a 'log' subcommand to see what's new in a subtree?
 
        add a --squash option so we don't merge histories but can still split