Add a new 'git subtree add' command for adding subtrees from a given rev.

diff --git a/git-subtree.sh b/git-subtree.sh
index 0c7b755cf1b779a040dde44c1ec850531ba813f4..2dc99e82cd0aa3c23587c77dbe4eac76d355385b 100755 (executable)
--- a/git-subtree.sh
+++ b/git-subtree.sh
@@ -8,7 +8,8 @@ if [ $# -eq 0 ]; then
     set -- -h
 fi
 OPTS_SPEC="\
-git subtree split [options...] <--prefix=prefix> <commit...> -- <path>
+git subtree add <--prefix=prefix <commit>
+git subtree split [options...] <--prefix=prefix> <commit...>
 git subtree merge 
 --
 h,help        show the help
@@ -67,11 +68,12 @@ done
 command="$1"
 shift
 case "$command" in
-       split|merge) ;;
+       add|merge) default= ;;
+       split) default="--default HEAD" ;;
        *) die "Unknown command '$command'" ;;
 esac
 
-revs=$(git rev-parse --default HEAD --revs-only "$@") || exit $?
+revs=$(git rev-parse $default --revs-only "$@") || exit $?
 
 if [ -z "$prefix" ]; then
        die "You must provide the --prefix option."
@@ -87,6 +89,7 @@ debug "command: {$command}"
 debug "quiet: {$quiet}"
 debug "revs: {$revs}"
 debug "dir: {$dir}"
+debug
 
 cache_setup()
 {
@@ -165,6 +168,20 @@ copy_commit()
        ) || die "Can't copy commit $1"
 }
 
+add_msg()
+{
+       dir="$1"
+       latest_old="$2"
+       latest_new="$3"
+       cat <<-EOF
+               Add '$dir/' from commit '$latest_new'
+               
+               git-subtree-dir: $dir
+               git-subtree-mainline: $latest_old
+               git-subtree-split: $latest_new
+       EOF
+}
+
 merge_msg()
 {
        dir="$1"
@@ -241,6 +258,39 @@ copy_or_skip()
        fi
 }
 
+cmd_add()
+{
+       if [ -e "$dir" ]; then
+               die "'$dir' already exists.  Cannot add."
+       fi
+       if ! git diff-index HEAD --exit-code --quiet; then
+               die "Working tree has modifications.  Cannot add."
+       fi
+       if ! git diff-index --cached HEAD --exit-code --quiet; then
+               die "Index has modifications.  Cannot add."
+       fi
+       set -- $revs
+       if [ $# -ne 1 ]; then
+               die "You must provide exactly one revision.  Got: '$revs'"
+       fi
+       rev="$1"
+       
+       debug "Adding $dir as '$rev'..."
+       git read-tree --prefix="$dir" $rev || exit $?
+       git checkout "$dir" || exit $?
+       tree=$(git write-tree) || exit $?
+       
+       headrev=$(git rev-parse HEAD) || exit $?
+       if [ -n "$headrev" -a "$headrev" != "$rev" ]; then
+               headp="-p $headrev"
+       else
+               headp=
+       fi
+       commit=$(add_msg "$dir" "$headrev" "$rev" |
+                git commit-tree $tree $headp -p "$rev") || exit $?
+       git reset "$commit" || exit $?
+}
+
 cmd_split()
 {
        debug "Splitting $dir..."