Function to compile icon dir into themes resource

src/calibre/constants.py

@@ -69,6 +69,7 @@ builtin_decorations = {
     'wavy': {'text-decoration-style': 'wavy', 'text-decoration-color': 'red', 'text-decoration-line': 'underline'},
     'strikeout': {'text-decoration-line': 'line-through', 'text-decoration-color': 'red'},
 }
+icons_subdirs = ('devices', 'plugins', 'mimetypes')
 
 
 _osx_ver = None

src/calibre/gui2/__init__.py

@@ -23,8 +23,9 @@ from threading import Lock, RLock
 import calibre.gui2.pyqt6_compat as pqc
 from calibre import as_unicode, prints
 from calibre.constants import (
-    DEBUG, __appname__ as APP_UID, __version__, config_dir, is_running_from_develop,
-    isbsd, isfrozen, islinux, ismacos, iswindows, isxp, plugins_loc
+    DEBUG, __appname__ as APP_UID, __version__, config_dir, icons_subdirs,
+    is_running_from_develop, isbsd, isfrozen, islinux, ismacos, iswindows, isxp,
+    plugins_loc
 )
 from calibre.ebooks.metadata import MetaInformation
 from calibre.gui2.linux_file_dialogs import (
@@ -47,9 +48,6 @@ except AttributeError:
     NO_URL_FORMATTING = getattr(QUrl, 'None')
 
 
-icons_subdirs = ('devices', 'plugins', 'mimetypes')
-
-
 def set_icon_paths():
     paths = []
     for main_dir in (os.path.join(config_dir, 'resources', 'images'), os.path.dirname(I(icons_subdirs[0], allow_user_override=False))):

src/calibre/gui2/rcc/__init__.py

@@ -4,8 +4,11 @@
 
 import os
 import sys
+import tempfile
+from posixpath import normpath
 from qt.core import QFile, QIODevice
 
+from calibre.constants import icons_subdirs
 from calibre_extensions import rcc_backend
 
 
@@ -13,7 +16,7 @@ def compile_qrc(output_path, *qrc_file_paths):
     rcc = rcc_backend.RCCResourceLibrary()
     err_device = QFile()
     if not err_device.open(sys.stderr.fileno(), QIODevice.OpenModeFlag.WriteOnly | QIODevice.OpenModeFlag.Text):
-        raise ValueError('Failed to open stderr for writing')
+        raise ValueError('Failed to open STDERR for writing')
     if not qrc_file_paths:
         raise TypeError('Must specify at least one .qrc file')
     rcc.setInputFiles(list(qrc_file_paths))
@@ -27,3 +30,59 @@ def compile_qrc(output_path, *qrc_file_paths):
     if not ok:
         os.remove(output_path)
         raise ValueError('Failed to write output')
+
+
+def index_theme(name, inherits=''):
+    min_sz, sz, max_sz = 16, 128, 512
+    lines = ['[Icon Theme]', f'Name={name}', 'Comment=Icons for calibre']
+    if inherits:
+        lines.append(f'Inherits={inherits}')
+    lines.append('')
+    subdirs = ['images'] + [f'images/{x}' for x in icons_subdirs]
+    for sb in subdirs:
+        lines += [f'[{sb}]', f'Size={sz}', f'MinSize={min_sz}', f'MaxSize={max_sz}', '']
+    return '\n'.join(lines)
+
+
+def compile_icon_dir_as_themes(path_to_dir, output_path, theme_name='calibre-default', inherits='', prefix='/icons'):
+    with tempfile.TemporaryDirectory(dir=path_to_dir) as tdir, open(os.path.join(tdir, 'icons.qrc'), 'w') as qrc:
+        print('<RCC>', file=qrc)
+        print(f'  <qresource prefix="{prefix}">', file=qrc)
+
+        def file(name):
+            print(f'    <file>{normpath(name)}</file>', file=qrc)
+
+        for q in (theme_name, theme_name + '-dark', theme_name + '-light'):
+            os.mkdir(os.path.join(tdir, q))
+            for sd in ['images'] + [f'images/{x}' for x in icons_subdirs]:
+                os.makedirs(os.path.join(tdir, q, sd))
+        with open(os.path.join(tdir, theme_name, 'index.theme'), 'w') as f:
+            f.write(index_theme(theme_name, inherits))
+            file(f'{theme_name}/index.theme')
+        for q in (theme_name + '-dark', theme_name + '-light'):
+            with open(os.path.join(tdir, q, 'index.theme'), 'w') as f:
+                f.write(index_theme(q, inherits=theme_name))
+                file(f'{q}/index.theme')
+
+        for sdir in ('.',) + icons_subdirs:
+            s = os.path.join(path_to_dir, sdir)
+            for x in os.listdir(s):
+                base, ext = os.path.splitext(x)
+                if ext.lower() not in ('.png',):
+                    continue
+                theme_dir = theme_name
+                dest_name = x
+                if base.endswith('-for-dark-theme'):
+                    theme_dir += '-dark'
+                    dest_name = x.replace('-for-dark-theme', '')
+                elif base.endswith('-for-light-theme'):
+                    theme_dir += '-light'
+                    dest_name = x.replace('-for-light-theme', '')
+                dest = theme_dir, 'images', sdir, dest_name
+                os.link(os.path.join(s, x), os.path.join(tdir, *dest))
+                file('/'.join(dest))
+        print('  </qresource>', file=qrc)
+        print('</RCC>', file=qrc)
+        qrc.close()
+        # input(tdir)
+        compile_qrc(output_path, qrc.name)