name=
output=
+driver=collapse
## Parse options
while [ -n "$1" ]; do
arg="$1"; shift
case "$arg" in
+ --quilt)
+ driver=quilt;;
+ --collapse)
+ driver=collapse;;
-*)
- echo "Usage: tg export NEWBRANCH" >&2
+ echo "Usage: tg export ([--collapse] NEWBRANCH | --quilt DIRECTORY)" >&2
exit 1;;
*)
- [ -z "$output" ] || die "new branch already specified ($output)"
+ [ -z "$output" ] || die "output already specified ($output)"
output="$arg";;
esac
done
base_rev="$(git rev-parse --short --verify "refs/top-bases/$name" 2>/dev/null)" ||
die "not on a TopGit-controlled branch"
-[ -n "$output" ] ||
- die "no target branch specified"
-! git rev-parse --verify "$output" >/dev/null 2>&1 ||
- die "target branch '$output' already exists; first run: git branch -D $output"
+playground="$(mktemp -d -t tg-export.XXXXXX)"
+trap 'rm -rf "$playground"' EXIT
-playground="$(mktemp -d)"
-trap 'rm -rf "$playground"' EXIT
+## Collapse driver
# Trusty Cogito code:
load_author()
echo "$name" >>"$playground/^ticker"
}
-# collapse_one
+# collapse
# This will collapse a single branch, using information about
# previously collapsed branches stored in $playground.
-collapse_one()
+collapse()
{
- branch_needs_update >/dev/null
- [ "$_ret" -eq 0 ] ||
- die "cancelling $_ret export of $_dep (-> $_name): branch not up-to-date"
-
if [ -s "$playground/$_dep" ]; then
# We've already seen this dep
commit="$(cat "$playground/$_dep")"
else
# First time hitting this dep; the common case
+ echo "Collapsing $_dep"
commit="$(collapsed_commit "$_dep")"
-
mkdir -p "$playground/$(dirname "$_dep")"
echo "$commit" >"$playground/$_dep"
- echo "Collapsed $_dep"
fi
# Propagate our work through the dependency chain
echo "$commit $_dep" >>"$playground/$_name^parents"
}
-# Collapse all the branches - this way, collapse_one will be
-# called in topological order.
-recurse_deps collapse_one "$name"
-(_ret=0; _dep="$name"; _name=""; _dep_is_tgish=1; collapse_one)
-git update-ref "refs/heads/$output" "$(cat "$playground/$name")"
+## Quilt driver
+
+quilt()
+{
+ if [ -z "$_dep_is_tgish" ]; then
+ # This dep is not for rewrite
+ return
+ fi
+
+ filename="$output/$_dep.diff"
+ if [ -e "$filename" ]; then
+ # We've already seen this dep
+ return
+ fi
+
+ echo "Exporting $_dep"
+ mkdir -p "$(dirname "$filename")"
+ tg patch "$_dep" >"$filename"
+ echo "$_dep.diff -p1" >>"$output/series"
+}
+
+
+## Machinery
+
+if [ "$driver" = "collapse" ]; then
+ [ -n "$output" ] ||
+ die "no target branch specified"
+ ! git rev-parse --verify "$output" >/dev/null 2>&1 ||
+ die "target branch '$output' already exists; first run: git branch -D $output"
+
+elif [ "$driver" = "quilt" ]; then
+ [ -n "$output" ] ||
+ die "no target directory specified"
+ [ ! -e "$output" ] ||
+ die "target directory already exists: $output"
+
+ mkdir -p "$output"
+fi
+
+
+driver()
+{
+ branch_needs_update >/dev/null
+ [ "$_ret" -eq 0 ] ||
+ die "cancelling export of $_dep (-> $_name): branch not up-to-date"
+
+ $driver
+}
+
+# Call driver on all the branches - this will happen
+# in topological order.
+recurse_deps driver "$name"
+(_ret=0; _dep="$name"; _name=""; _dep_is_tgish=1; driver)
+
+
+if [ "$driver" = "collapse" ]; then
+ git update-ref "refs/heads/$output" "$(cat "$playground/$name")" ""
+
+ depcount="$(cat "$playground/^ticker" | wc -l)"
+ echo "Exported topic branch $name (total $depcount topics) to branch $output"
-depcount="$(cat "$playground/^ticker" | wc -l)"
-echo "Exported topic branch $name (total $depcount topics) to branch $output"
+elif [ "$driver" = "quilt" ]; then
+ depcount="$(cat "$output/series" | wc -l)"
+ echo "Exported topic branch $name (total $depcount topics) to directory $output"
+fi