Check all constellation files for panics

Teaches the `etc/ci/check_no_panic.sh` script to handle directories,
so it can check all constellation files for panics.

etc/ci/check_no_panic.sh

@@ -4,7 +4,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-# Make sure listed files do not use unwrap() or panic!()
+# Make sure listed paths do not use unwrap() or panic!()
 
 set -o errexit
 set -o nounset
@@ -13,14 +13,21 @@ set -o pipefail
 # cd into repo root to make sure paths work in any case
 cd "$(git rev-parse --show-toplevel)"
 
-FILES=("components/compositing/compositor.rs"
-       "components/constellation/constellation.rs"
-       "components/constellation/pipeline.rs"
-       "ports/glutin/lib.rs"
-       "ports/glutin/window.rs")
+# Each path can be either a single file or a directory
+PATHS=(
+    "components/compositing/compositor.rs"
+    "components/constellation/"
+    "ports/glutin/lib.rs"
+    "ports/glutin/window.rs"
+)
 
-# make sure the files exist
-ls -1 "${FILES[@]}"
+# Make sure the paths exist
+ls -1 "${PATHS[@]}"
 
-# make sure the files do not contain "unwrap" or "panic!"
-! grep --line-number --with-filename "unwrap(\|panic!(" "${FILES[@]}"
+# Make sure the files do not contain "unwrap" or "panic!"
+! grep \
+    --dereference-recursive \
+    --line-number \
+    --with-filename \
+    "unwrap(\|panic!(" \
+    "${PATHS[@]}"