add use-<proj>-custom FOO for any commit/branch/tag

While it was possible before to build any branch of mpv/ffmpeg/etc by
just git checkout $whatever and then ./build, it got reset after
./rebuild or ./update etc.

Add use-mpv-custom and use-ffmpeg-custom which accept any
commit/branch/tag which will survive ./rebuild, ./update, etc.

This should make it slightly easier to build past versions of mpv.

While at it, also add use-libass-{master|custom}

1 files changed, 10 insertions, 0 deletions

diff --git a/use-mpv-custom b/use-mpv-custom
new file mode 100755
index 0000000..cea8d10
--- /dev/null
+++ b/use-mpv-custom
@@ -0,0 +1,10 @@
+#!/bin/sh
+set -e
+export LC_ALL=C
+
+if [ -z "$1" ]; then
+    echo "Aborting. Please provide a commit hash or a tag/branch name."
+    exit 1
+fi
+
+scripts/switch-branch mpv "@$1"