Make pyproject.toml PEP 621 compliant

- converted tool.poetry to PEP 621 (default behavior for poetry)
- converted setup.py to PEP 621 (recommended by setuptools)
- use pyproject.toml instead of version.txt
- use importlib instead of version.txt
- use PEP 621 dependency format in flatpak build scripts
- added tomli as a dev dependency (used in build scripts)
- removed version.txt (no longer used)
- cleaned up dependencies

- version is still in desktop/setup.py (unclear on how snapcraft uses it)
- poetry lockfiles need to be rebuilt

flatpak/pyproject-to-requirements.py

@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+import sys
+import click
+
+if sys.version_info >= (3, 11):
+    import tomllib
+else:
+    import tomli as tomllib
+
+
+def format_version(dep, version):
+    if version == "*":
+        return dep
+    # If it's a dictionary, assume it's in the format {extras = ["socks"], version = "*"}
+    elif isinstance(version, dict) and "version" in version:
+        version = version["version"]
+        if version == "*":
+            return dep
+        elif version.startswith("^"):
+            return f"{dep}>={version[1:]}.0"
+        elif version.startswith((">=", "<=", "!=", "==", "<", ">")):
+            return f"{dep}{version}"
+        else:
+            return f"{dep}=={version}"
+    elif version.startswith("^"):
+        return f"{dep}>={version[1:]}.0"
+    elif version.startswith((">=", "<=", "!=", "==", "<", ">")):
+        return f"{dep}{version}"
+    else:
+        return f"{dep}=={version}"
+
+
+@click.command()
+@click.argument("pyproject_filename")
+def poetry_to_requirements(pyproject_filename):
+    """Convert poetry dependencies in a pyproject.toml to requirements format."""
+    with open(pyproject_filename, "r") as f:
+        data = tomllib.load(f)
+
+    dependencies = data.get("tool", {}).get("poetry", {}).get("dependencies", {})
+
+    requirements = []
+
+    for dep, version in dependencies.items():
+        if dep == "python" or dep == "onionshare_cli":
+            continue
+
+        formatted = format_version(dep, version)
+        if formatted:
+            requirements.append(formatted)
+
+    for req in requirements:
+        print(req)
+
+
+@click.command()
+@click.argument("pyproject_filename")
+def pyproject_to_requirements(pyproject_filename):
+    """Convert PEP 631 dependencies in a pyproject.toml to requirements format."""
+    with open(pyproject_filename, "r") as f:
+        data = tomllib.load(f)
+
+    dependencies = data.get("project", {}).get("dependencies", [])
+
+    requirements = []
+
+    for dep in dependencies:
+        if dep == "onionshare_cli":
+            continue
+
+        requirements.append(dependencies)
+
+    for req in requirements:
+        print(req)
+
+
+if __name__ == "__main__":
+    pyproject_to_requirements()