compress static assets

app/e11sync/settings.py

@@ -1,17 +1,16 @@
 from pathlib import Path
 from os import environ
 
-# All that comes from the environment needs to be defined here
 _DEBUG = bool(environ.get('E11SYNC_DEBUG', False))
+_COMPRESS_OFFLINE = bool(environ.get('E11SYNC_COMPRESS_OFFLINE', False))
 _STATIC_ROOT = environ.get('E11SYNC_STATIC_ROOT', '/tmp/e11sync-static')
-_GEOIP_PATH = environ.get("GEOIP_PATH")
+_GEOIP_PATH = environ.get('GEOIP_PATH')
 
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
 BASE_DIR = Path(__file__).resolve().parent.parent
 
 ########################################
 ## No more side effects after this place
-########################################
 
 SECRET_KEY = 'django-insecure-$e2!=equ(efm0e%f9&t+xjtz0)$*$@pw%rnjdqcl8f@5o5hw!l'
 
@@ -105,9 +104,27 @@ STATICFILES_FINDERS = [
 
 STATIC_ROOT = _STATIC_ROOT
 
+# At the time of testing:
+#   main-full.css: 34K
+#   main-mini.css: 49K
+#   main-full.css.br: 5.0K
+#   main-mini.css.br: 7.1K
+#
+# Minifying those files will necessitate sourcemaps, which
+# is not currently possible due to
+# https://github.com/django-compressor/django-compressor/issues/438
+# Since the savings with minification are not that huge, let's keep
+# it a bir larger, but much simpler.
+COMPRESS_ENABLED = True
+
+COMPRESS_OFFLINE = _COMPRESS_OFFLINE
+
+COMPRESS_FILTERS = {
+    'css': [],
+    'js': [],
+}
+
 COMPRESS_PRECOMPILERS = (
-    # TODO: --style=compressed + source maps
-    # https://github.com/django-compressor/django-compressor/issues/438
     ('text/x-scss', 'sass {infile} {outfile}'),
 )
 

flake.nix

@@ -63,11 +63,15 @@
         ];
         buildPhase = ''
             mkdir -p $out/static
-            env \
-                E11SYNC_STATIC_ROOT=$out/static \
-                E11SYNC_DEBUG= \
-                ${pkgs.python3}/bin/python3 \
-                ${self}/app/manage.py collectstatic
+            export E11SYNC_STATIC_ROOT=$out/static
+            export E11SYNC_DEBUG=
+            export E11SYNC_COMPRESS_OFFLINE=1
+            ${pkgs.python3}/bin/python3 ${self}/app/manage.py collectstatic
+            ${pkgs.python3}/bin/python3 ${self}/app/manage.py compress
+
+            ${pkgs.findutils}/bin/find $out/static/CACHE -name '*.css' | \
+                ${pkgs.findutils}/bin/xargs -P8 -I{} sh -c \
+                    "${pkgs.zopfli}/bin/zopfli {} && ${pkgs.brotli}/bin/brotli {}"
         '';
       };
       devShells.default = pkgs.mkShellNoCC {