2 files changed, 150 insertions, 0 deletions
diff --git a/tagit/apps/__init__.py b/tagit/apps/__init__.py
new file mode 100644
index 0000000..84d0bf1
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+++ b/tagit/apps/__init__.py
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+#!/usr/bin/env python3
+"""The tagit applications.
+
+Part of the tagit module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# standard imports
+import argparse
+import typing
+
+# tagit imports
+import tagit
+
+# inner-module imports
+from .desktop import main as desktop
+
+# exports
+__all__: typing.Sequence[str] = (
+    'desktop',
+    'main',
+    )
+
+# config
+apps = {
+    'desktop'       : desktop,
+    }
+
+
+## code ##
+
+def main(argv=None):
+    """The BSFS browser, focused on image tagging."""
+    parser = argparse.ArgumentParser(description=main.__doc__, prog='tagit')
+    # version
+    parser.add_argument('--version', action='version',
+        version='%(prog)s {}.{}.{}'.format(*tuple(tagit.version_info))) # pylint: disable=C0209
+    # application selection
+    parser.add_argument('app', choices=apps.keys(), nargs='?', default='desktop',
+        help='Select the application to run.')
+    # dangling args
+    parser.add_argument('rest', nargs=argparse.REMAINDER)
+    # parse
+    args = parser.parse_args()
+    # run application
+    apps[args.app](args.rest)
+
+if __name__ == '__main__':
+    import sys
+    main(sys.argv[1:])
+
+## EOF ##
diff --git a/tagit/apps/desktop.py b/tagit/apps/desktop.py
new file mode 100644
index 0000000..149bf30
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+++ b/tagit/apps/desktop.py
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+"""
+
+Part of the tagit module.
+A copy of the license is provided with the project.
+Author: Matthias Baumgartner, 2022
+"""
+# standard imports
+import os
+import typing
+
+# kivy imports
+from kivy.app import App
+from kivy.resources import resource_find
+from kivy.uix.settings import SettingsWithSidebar
+
+# tagit imports
+from tagit import config
+from tagit.utils import bsfs, ns
+from tagit.utils.bsfs import URI
+from tagit.windows import desktop
+
+# exports
+__all__: typing.Sequence[str] = (
+    'main',
+    )
+
+
+## code ##
+
+def load_data_hook(cfg, store):
+    """Data loading hook to circumvent non-persistent storage."""
+    import pickle
+    import os
+    # fetch data_hook config flags
+    schema_path = os.path.expanduser(cfg('session', 'data_hook', 'schema'))
+    triples_path = os.path.expanduser(cfg('session', 'data_hook', 'triples'))
+    # load data if present
+    if os.path.exists(schema_path) and os.path.exists(triples_path):
+        with open(schema_path, 'rb') as ifile:
+            store._backend._schema = pickle.load(ifile)
+        with open(triples_path, 'rb') as ifile:
+            for triple in pickle.load(ifile):
+                store._backend._graph.add(triple)
+    return store
+
+config.declare(('session', 'data_hook', 'schema'), config.String(), '')
+config.declare(('session', 'data_hook', 'triples'), config.String(), '')
+
+
+class TagitApp(App):
+    """The tagit main application."""
+
+    def build(self):
+        # set settings panel style
+        self.settings_cls = SettingsWithSidebar
+
+        # set title
+        self.title = 'tagit v0.23.03'
+
+        # load config
+        from tagit.config.loader import load_settings, TAGITRC
+        cfg = load_settings(TAGITRC, 0)
+
+        # open BSFS storage
+        store = load_data_hook(cfg, bsfs.Open(cfg('session', 'bsfs'))) # FIXME: mb/port: data hook
+        # check storage schema
+        with open(resource_find('required_schema.nt'), 'rt') as ifile:
+            required_schema = bsfs.schema.from_string(ifile.read())
+        if not required_schema.consistent_with(store.schema):
+            raise Exception("The storage's schema is incompatible with tagit's requirements")
+        if not required_schema <= store.schema:
+            store.migrate(required_schema | store.schema)
+
+        # create widget
+        return desktop.MainWindow(cfg, store, None) # FIXME: mb/port: expects log arguments
+
+    def on_start(self):
+        # trigger startup operations
+        self.root.on_startup()
+
+
+def main(argv):
+    """Start the tagit GUI. Opens a window to browse images."""
+    # Run the GUI
+    app = TagitApp()
+    app.run()
+
+## config
+
+config.declare(('session', 'bsfs'), config.Any(), {},
+    __name__, 'bsfs config', 'Configuration to connect to a BSFS storage.')
+
+## main ##
+
+if __name__ == '__main__':
+    main()
+
+## EOF ##