ci: add filename checks

.github/workflows/check_filename.yaml

@@ -0,0 +1,18 @@
+name: check_filename
+on: [push, pull_request]
+jobs:
+  check_hash:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: |
+          sha1sum collection/* | \
+          perl -nle '
+            /^(\w{64})  (collection\/(.+)_(.+)\.\w+)$/;  
+            if (lc($1) ne lc($4)) {
+              print "FAIL: $2 : sha1sum should be $1!";
+              $err = 1;
+            };
+            END {
+              exit 1 if $err == 1
+            }'

CONTRIBUTING.md

@@ -6,7 +6,7 @@
 - Add your avatar image to the `avatars` folder.
     - The image should be named as `<your_name>_<sha1sum>.<ext>`.
         - `<your_name>` is your name.
-            - If your name contains spaces, replace them with underscores (`_`).
+            - If your name contains spaces, replace them with dashes (`-`).
         - `<sha1sum>` is the SHA1 checksum of your avatar image.
         - `<ext>` is the extension of the image (e.g., `.jpg`, `.png`, `.gif`)
 - Create a pull request to merge your branch into `master`.