refactor: rebuild the CLI with argparse subcommands and one handler per command

tests/test_cmd.py

@@ -0,0 +1,59 @@
+import sys
+
+import pytest
+
+import orvanitag.orvani as orvani
+from orvanitag.cmd import main
+
+
+@pytest.fixture
+def otag(tmp_path, monkeypatch, capsys):
+    monkeypatch.chdir(tmp_path)
+
+    def run(*argv):
+        monkeypatch.setattr(sys, 'argv', ['otag', *argv])
+        main()
+        return capsys.readouterr().out
+    return run
+
+
+def test_no_command_prints_help(otag):
+    out = otag()
+    for command in ['add', 'remove', 'list', 'copy', 'move', 'del', 'clean', 'purge', 'scan', 'write', 'export', 'import']:
+        assert command in out
+
+
+def test_each_command_has_its_own_help(otag):
+    with pytest.raises(SystemExit) as exit:
+        otag('ls', '-h')
+    assert exit.value.code == 0
+
+
+def test_copy_move_and_delete_with_file(otag, tmp_path):
+    (tmp_path / 'a.mp3').touch()
+    (tmp_path / 'sub').mkdir()
+    otag('a', 'a.mp3', '#lofi')
+    otag('cp', 'a.mp3', 'b.mp3')
+    otag('mv', '-f', 'a.mp3', 'sub')
+    assert (tmp_path / 'sub' / 'a.mp3').exists() and not (tmp_path / 'a.mp3').exists()
+    assert (tmp_path / orvani.CONTEXT_FILE).read_text() == 'b.mp3 --- #lofi\n'
+
+    otag('rm', '--with-file', 'sub/a.mp3')
+    assert not (tmp_path / 'sub' / 'a.mp3').exists()
+    assert not (tmp_path / 'sub' / orvani.CONTEXT_FILE).exists()
+
+
+def test_add_needs_tags(otag, tmp_path):
+    (tmp_path / 'a.mp3').touch()
+    with pytest.raises(SystemExit) as exit:
+        otag('a', 'a.mp3')
+    assert exit.value.code == 2
+
+
+def test_purge_keeps_config(otag, tmp_path):
+    (tmp_path / 'a.mp3').touch()
+    (tmp_path / orvani.CONFIG_FILE).write_text('plugins = []\n')
+    otag('a', 'a.mp3', '#lofi')
+    otag('p')
+    assert not (tmp_path / orvani.CONTEXT_FILE).exists()
+    assert (tmp_path / orvani.CONFIG_FILE).exists()