set -- -h
fi
OPTS_SPEC="\
-git subtree add --prefix=<prefix> <commit>
-git subtree split [options...] --prefix=<prefix> <commit...>
+git subtree add --prefix=<prefix> <commit>
git subtree merge --prefix=<prefix> <commit>
git subtree pull --prefix=<prefix> <repository> <refspec...>
+git subtree split --prefix=<prefix> <commit...>
--
h,help show the help
q quiet
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
+ options for 'merge' and 'pull'
+squash merge subtree changes as a single commit
"
eval $(echo "$OPTS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?)
. git-sh-setup
require_work_tree
quiet=
+branch=
debug=
command=
onto=
rejoin=
ignore_joins=
annotate=
+squash=
debug()
{
-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 ;;
--no-rejoin) rejoin= ;;
--ignore-joins) ignore_joins=1 ;;
--no-ignore-joins) ignore_joins= ;;
+ --squash) squash=1 ;;
+ --no-squash) squash= ;;
--) break ;;
+ *) die "Unexpected option: $opt" ;;
esac
done
echo "$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
}
+find_latest_squash()
+{
+ debug "Looking for latest squash..."
+ dir="$1"
+ git log --grep="^git-subtree-dir: $dir\$" \
+ --pretty=format:'START %H%n%s%n%n%b%nEND%n' HEAD |
+ while read a b junk; do
+ case "$a" in
+ START) sq="$b" ;;
+ git-subtree-mainline:) main="$b" ;;
+ git-subtree-split:) sub="$b" ;;
+ END)
+ if [ -n "$sub" ]; then
+ if [ -n "$main" ]; then
+ # a rejoin commit?
+ # Pretend its sub was a squash.
+ sq="$sub"
+ fi
+ debug "Squash found: $sq $sub"
+ echo "$sq" "$sub"
+ break
+ fi
+ sq=
+ main=
+ sub=
+ ;;
+ esac
+ done
+}
+
find_existing_splits()
{
debug "Looking for prior splits..."
dir="$1"
revs="$2"
git log --grep="^git-subtree-dir: $dir\$" \
- --pretty=format:'%s%n%n%b%nEND' $revs |
+ --pretty=format:'START %H%n%s%n%n%b%nEND%n' $revs |
while read a b junk; do
case "$a" in
+ START) main="$b"; sq="$b" ;;
git-subtree-mainline:) main="$b" ;;
git-subtree-split:) sub="$b" ;;
- *)
+ END)
+ if [ -z "$main" -a -n "$sub" ]; then
+ # squash commits refer to a subtree
+ cache_set "$sq" "$sub"
+ fi
if [ -n "$main" -a -n "$sub" ]; then
debug " Prior: $main -> $sub"
cache_set $main $sub
try_remove_previous "$main"
try_remove_previous "$sub"
- main=
- sub=
fi
+ main=
+ sub=
;;
esac
done
copy_commit()
{
- # We're doing to set some environment vars here, so
+ # We're going to set some environment vars here, so
# do it in a subshell to get rid of them safely later
debug copy_commit "{$1}" "{$2}" "{$3}"
git log -1 --pretty=format:'%an%n%ae%n%ad%n%cn%n%ce%n%cd%n%s%n%n%b' "$1" |
EOF
}
-merge_msg()
+rejoin_msg()
{
dir="$1"
latest_old="$2"
EOF
}
+squash_msg()
+{
+ dir="$1"
+ oldsub="$2"
+ newsub="$3"
+ oldsub_short=$(git rev-parse --short "$oldsub")
+ newsub_short=$(git rev-parse --short "$newsub")
+ cat <<-EOF
+ Squashed '$dir/' changes from $oldsub_short..$newsub_short
+
+ EOF
+
+ git log --pretty=tformat:'%h %s' "$oldsub..$newsub"
+ git log --pretty=tformat:'REVERT: %h %s' "$newsub..$oldsub"
+
+ cat <<-EOF
+
+ git-subtree-dir: $dir
+ git-subtree-split: $newsub
+ EOF
+}
+
toptree_for_commit()
{
commit="$1"
fi
}
+new_squash_commit()
+{
+ old="$1"
+ oldsub="$2"
+ newsub="$3"
+ tree=$(toptree_for_commit $newsub) || exit $?
+ squash_msg "$dir" "$oldsub" "$newsub" |
+ git commit-tree "$tree" -p "$old" || exit $?
+}
+
copy_or_skip()
{
rev="$1"
cmd_split()
{
+ if [ -n "$branch" ] && rev_exists "refs/heads/$branch"; then
+ die "Branch '$branch' already exists."
+ fi
+
debug "Splitting $dir..."
cache_setup || exit $?
tree=$(subtree_for_commit $rev "$dir")
debug " tree is: $tree"
+
+ # ugly. is there no better way to tell if this is a subtree
+ # vs. a mainline commit? Does it matter?
[ -z $tree ] && continue
newrev=$(copy_or_skip "$rev" "$tree" "$newparents") || exit $?
debug "Merging split branch into HEAD..."
latest_old=$(cache_get latest_old)
git merge -s ours \
- -m "$(merge_msg $dir $latest_old $latest_new)" \
- $latest_new >&2
+ -m "$(rejoin_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
fi
rev="$1"
+ if [ -n "$squash" ]; then
+ first_split="$(find_latest_squash "$dir")"
+ if [ -z "$first_split" ]; then
+ die "Can't squash-merge: '$dir' was never added."
+ fi
+ set $first_split
+ old=$1
+ sub=$2
+ if [ "$sub" = "$rev" ]; then
+ say "Subtree is already at commit $rev."
+ exit 0
+ fi
+ new=$(new_squash_commit "$old" "$sub" "$rev") || exit $?
+ debug "New squash commit: $new"
+ rev="$new"
+ fi
+
git merge -s subtree $rev
}