Use pyproject.toml + uv_build

This replaces setup.py by a modern pyproject.toml using uv_build
backend.

Dependencies are being also managed by uv, so to install dependencies
and run the project one can execute:

```
uv sync
uv run pytest # optional
python -m avp
```

To build the both source and binary (wheel) distribution package run:
```
uv build
```

Uv can be installed with `pip install uv`.

The directory structure has been changed to reflect best practices.
- src/* -> src/avp/
- src/tests -> ../tests

1 files changed, 64 insertions, 0 deletions

diff --git a/src/avp/cli.py b/src/avp/cli.py
new file mode 100644
index 0000000..02ceee6
--- /dev/null
+++ b/src/avp/cli.py
@@ -0,0 +1,64 @@
+from PyQt6.QtWidgets import QApplication
+import sys
+import logging
+import re
+import string
+
+
+log = logging.getLogger("AVP.Main")
+
+
+def main() -> int:
+    """Returns an exit code (0 for success)"""
+    proj = None
+    mode = "GUI"
+
+    # Determine whether we're in GUI or commandline mode
+    if len(sys.argv) > 2:
+        mode = "commandline"
+    elif len(sys.argv) == 2:
+        if sys.argv[1].startswith("-"):
+            mode = "commandline"
+        else:
+            # remove unsafe punctuation characters such as \/?*&^%$#
+            if sys.argv[1].endswith(".avp"):
+                # remove file extension
+                sys.argv[1] = sys.argv[1][:-4]
+            sys.argv[1] = re.sub(f"[{re.escape(string.punctuation)}]", "", sys.argv[1])
+            # opening a project file with gui
+            proj = sys.argv[1]
+
+    # Create Qt Application
+    app = QApplication(sys.argv)
+    app.setApplicationName("audio-visualizer")
+
+    screen = app.primaryScreen()
+    if screen is None:
+        dpi = None
+        log.error("Could not detect DPI")
+    else:
+        dpi = screen.physicalDotsPerInchX()
+        log.info("Detected screen DPI: %s", dpi)
+
+    # Launch program
+    if mode == "commandline":
+        from .command import Command
+
+        main = Command()
+        mode = main.parseArgs()
+        log.debug("Finished creating command object")
+
+    # Both branches here may occur in one execution:
+    # Commandline parsing could change mode back to GUI
+    if mode == "GUI":
+        from avp.gui.mainwindow import MainWindow
+
+        mainWindow = MainWindow(proj, dpi)
+        log.debug("Finished creating MainWindow")
+        mainWindow.raise_()
+
+    return app.exec()
+
+
+if __name__ == "__main__":
+    sys.exit(main())