macOS: Reduce .dmg size from 237 MB -> 50.7 MB

References #124

Author: davidfstr

setup/make-mac.sh

@@ -3,9 +3,26 @@
 VERSION=`python -c 'import sys; sys.path.append("../src"); import crystal; print(crystal.__version__)'`
 
 rm -rf build dist dist-mac
-poetry run python setup.py py2app
+
+# Build .app
+if [ "$1" != "--app-only" ]; then
+    GRAPH_OPT=""
+else
+    # --graph: Generates a GraphViz .dot file in the build directory that shows
+    #          the calculated module dependency graph
+    GRAPH_OPT="--graph"
+fi
+poetry run python setup.py py2app $GRAPH_OPT
+
+# Slim .app
+zip "dist/Crystal Web Archiver.app/Contents/Resources/lib/python39.zip" \
+    -d "wx/locale/*"
+
+# Build .dmg
 mkdir dist-mac
 if [ "$1" != "--app-only" ]; then
     echo 'Building disk image... (skip with --app-only option)'
-    hdiutil create -srcfolder dist -volname "Crystal Web Archiver" -format UDZO dist-mac/crystal-mac-$VERSION.dmg
+    # -format UDBZ: Use bzip2 compression, which produces smaller images
+    #               than zlib compression (UDZO), even with zlib-level=9
+    hdiutil create -srcfolder dist -volname "Crystal Web Archiver" -format UDBZ dist-mac/crystal-mac-$VERSION.dmg
 fi

setup/setup.py

@@ -64,6 +64,11 @@
             'argv_emulation': False,
             'iconfile': 'media/AppIconMac.icns',
             'plist': PLIST,
+            'excludes': [
+                'numpy',
+                'test',  # CPython test data
+                'PIL',
+            ]
         }},
     )
 elif sys.platform == 'win32':

src/crystal/tests/util/screenshots.py

@@ -1,6 +1,5 @@
 from contextlib import contextmanager
 import os
-import pyscreeze
 import sys
 from typing import Iterator
 
@@ -13,11 +12,16 @@ def screenshot_if_raises() -> Iterator[None]:
         # Take screenshot if screenshots directory path defined
         screenshots_dirpath = os.environ.get('CRYSTAL_SCREENSHOTS_DIRPATH')
         if screenshots_dirpath is not None:
-            os.makedirs(screenshots_dirpath, exist_ok=True)
-            
-            screenshot_filename = os.environ.get('CRYSTAL_SCREENSHOT_ID', 'screenshot') + '.png'
-            screenshot_filepath = os.path.join(screenshots_dirpath, screenshot_filename)
-            print('*** Saving screenshot to: ' + os.path.abspath(screenshot_filepath), file=sys.stderr)
-            pyscreeze.screenshot(screenshot_filepath)
+            try:
+                import pyscreeze
+            except ImportError:  # probably PIL missing
+                print('*** Unable to save screenshot because pyscreeze not available. Probably PIL is missing.', file=sys.stderr)
+            else:
+                os.makedirs(screenshots_dirpath, exist_ok=True)
+                
+                screenshot_filename = os.environ.get('CRYSTAL_SCREENSHOT_ID', 'screenshot') + '.png'
+                screenshot_filepath = os.path.join(screenshots_dirpath, screenshot_filename)
+                print('*** Saving screenshot to: ' + os.path.abspath(screenshot_filepath), file=sys.stderr)
+                pyscreeze.screenshot(screenshot_filepath)
 
         raise