appimage-starter (#42)

create program launcher;
reduced size of appimage;
download of appimages working(?)

Co-authored-by: Dominik Demuth <dominik.demuth@physik.tu-darmstadt.de>
Reviewed-on: #42

src/gui_qt/lib/starter.py

@@ -0,0 +1,95 @@
+from __future__ import annotations
+
+import re
+from shutil import copyfile
+from pathlib import Path
+import os
+from configparser import ConfigParser
+from importlib.resources import path as resource_path
+
+from nmreval.configs import config_paths
+from nmreval.lib.logger import logger
+
+
+def make_starter(app_file: str | None):
+    if app_file is not None:
+        make_starter_appimage(Path(app_file))
+    else:
+        make_starter_src()
+
+
+def make_starter_appimage(app_file: Path):
+    new_path = Path.home() / '.local' / 'bin' / app_file.name
+
+    if app_file != new_path:
+        app_file.rename(new_path)
+
+    create_desktop_file(new_path)
+
+
+def make_starter_src():
+    home = Path.home()
+    p = Path.home()
+    for p in Path(__file__).parents:
+        if p.stem == 'src':
+            break
+        elif p == home:
+            break
+
+    success = p != Path.home()
+    if success:
+        bin_path = p.with_name('bin') / 'evaluate.py'
+        success = bin_path.exists()
+
+    if not success:
+        logger.warning('Location of evaluate.py could not be determined')
+        return False
+
+    create_desktop_file(bin_path)
+
+
+def create_desktop_file(new_path: Path):
+    logo_path = config_paths() / 'logo.png'
+    if not logo_path.exists():
+        with resource_path('resources', 'logo.png') as fp:
+            copyfile(fp, logo_path)
+    desktop_entry = f"""\
+[Desktop Entry]
+Name=NMReval
+Comment=Best program ever (maybe)
+Exec={new_path}
+Icon={logo_path}
+Type=Application
+Terminal=false
+Categories=Science;NumericalAnalysis;Physics;DataVisualization;Other;
+NoDisplay=false
+"""
+    file_name = 'pkm.vogel.nmreval.desktop'
+    with Path('~/.local/share/applications/', file_name).expanduser().open('w') as f:
+        f.write(desktop_entry)
+
+    desktop_dir = get_xkg_user_dirs('desktop')
+    if desktop_dir is not None:
+        desk_file = Path(desktop_dir, file_name)
+        with desk_file.open('w') as f:
+            f.write(desktop_entry)
+
+        desk_file.chmod(0o755)
+
+
+def get_xkg_user_dirs(dir_type: str) -> str | None:
+    xdg_conf_home = os.getenv('XDG_CONFIG_HOME') or str(Path.home() / '.config')
+
+    with Path(xdg_conf_home, 'user-dirs.dirs').open('r') as f:
+        conf_string = '[XDG_USER_DIRS]\n' + f.read()
+        conf_string = re.sub(r'\$HOME', str(Path.home()), conf_string)
+        conf_string = re.sub('"', '', conf_string)
+
+    config = ConfigParser()
+    config.read_string(conf_string)
+
+    return config['XDG_USER_DIRS'].get(f'xdg_{dir_type}_dir')
+
+
+if __name__ == '__main__':
+    make_starter()