Add rich previews for copied files

tests/run.sh

@@ -2,5 +2,5 @@
 # Run all plugin logic tests. Requires node and python3.
 set -euo pipefail
 cd "$(dirname "${BASH_SOURCE[0]}")/.."
-python3 -m unittest discover -s tests -p 'test_capture.py'
+python3 -m unittest discover -s tests -p 'test_*.py'
 exec node --test 'tests/*.mjs'

tests/test_file_preview.py

@@ -0,0 +1,69 @@
+import importlib.util
+import os
+from pathlib import Path
+import shutil
+import subprocess
+import tempfile
+import unittest
+from unittest.mock import patch
+
+spec = importlib.util.spec_from_file_location('file_preview', Path(__file__).resolve().parents[1] / 'scripts/file-preview.py')
+module = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(module)
+
+
+class FilePreviewTests(unittest.TestCase):
+    def test_text_is_bounded_and_path_preserved(self):
+        with tempfile.TemporaryDirectory() as directory:
+            path = Path(directory) / 'a " quoted.txt'
+            path.write_text('a' * 10000)
+            data = module.preview(str(path))
+            self.assertEqual(data['bytes'], 10000)
+            self.assertEqual(len(data['text']), 8192)
+            self.assertTrue(data['truncated'])
+            self.assertEqual(data['path'], str(path))
+
+    def test_missing_file_and_folder(self):
+        with tempfile.TemporaryDirectory() as directory:
+            self.assertEqual(module.preview(directory)['kind'], 'Folder')
+            self.assertIn('error', module.preview(directory + '/missing'))
+
+    def test_special_file_is_not_read(self):
+        with tempfile.TemporaryDirectory() as directory:
+            path = directory + '/fifo.txt'
+            os.mkfifo(path)
+            self.assertEqual(module.preview(path)['kind'], 'Special file')
+
+    def test_missing_media_tools_preserve_basic_metadata(self):
+        with tempfile.NamedTemporaryFile(suffix='.mp4') as source:
+            with patch.object(module, 'read_bounded', return_value=None):
+                data = module.preview(source.name)
+            self.assertEqual(data['mime'], 'video/mp4')
+            self.assertIn('bytes', data)
+            self.assertNotIn('thumbnail', data)
+
+    @unittest.skipUnless(shutil.which('ffmpeg') and shutil.which('ffprobe'), 'ffmpeg optional')
+    def test_video_resolution_duration_and_thumbnail(self):
+        with tempfile.TemporaryDirectory() as directory:
+            path = directory + '/clip.mkv'
+            subprocess.run(['ffmpeg', '-v', 'error', '-f', 'lavfi', '-i', 'color=c=red:s=160x90:d=1', '-c:v', 'ffv1', path], check=True, timeout=10)
+            data = module.preview(path)
+            self.assertEqual((data['width'], data['height']), (160, 90))
+            self.assertAlmostEqual(data['duration'], 1, places=1)
+            self.assertTrue(data['thumbnail'].startswith('data:image/jpeg;base64,'))
+
+    @unittest.skipUnless(shutil.which('ffmpeg') and shutil.which('ffprobe'), 'ffmpeg optional')
+    def test_audio_details(self):
+        with tempfile.TemporaryDirectory() as directory:
+            path = directory + '/audio.wav'
+            subprocess.run(['ffmpeg', '-v', 'error', '-f', 'lavfi', '-i', 'sine=duration=1', path], check=True, timeout=10)
+            data = module.preview(path)
+            self.assertAlmostEqual(data['duration'], 1, places=1)
+            self.assertIn('44100 Hz', data['audio'])
+            self.assertNotIn('thumbnail', data)
+
+    def test_generic_binary_not_shown_as_text(self):
+        with tempfile.NamedTemporaryFile(suffix='.txt') as source:
+            source.write(b'abc\x00def')
+            source.flush()
+            self.assertNotIn('text', module.preview(source.name))