Fix and refactor `prepare_outtmpl`

The following tests would have failed previously:
%(id)d %(id)r
%(ext)s-%(ext|def)d
%(width|)d
%(id)r %(height)r
%(formats.0)r
%s

1 files changed, 14 insertions, 0 deletions

diff --git a/test/test_postprocessors.py b/test/test_postprocessors.py
index 1f8f375cc..bdc2d93cb 100644
--- a/test/test_postprocessors.py
+++ b/test/test_postprocessors.py
@@ -8,7 +8,10 @@ import sys
 import unittest
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
+from yt_dlp import YoutubeDL
+from yt_dlp.compat import compat_shlex_quote
 from yt_dlp.postprocessor import (
+    ExecAfterDownloadPP,
     FFmpegThumbnailsConvertorPP,
     MetadataFromFieldPP,
     MetadataFromTitlePP,
@@ -55,3 +58,14 @@ class TestConvertThumbnail(unittest.TestCase):
 
         for _, out in tests:
             os.remove(file.format(out))
+
+
+class TestExecAfterDownload(unittest.TestCase):
+    def test_parse_cmd(self):
+        pp = ExecAfterDownloadPP(YoutubeDL(), '')
+        info = {'filepath': 'file name'}
+        quoted_filepath = compat_shlex_quote(info['filepath'])
+
+        self.assertEqual(pp.parse_cmd('echo', info), 'echo %s' % quoted_filepath)
+        self.assertEqual(pp.parse_cmd('echo.{}', info), 'echo.%s' % quoted_filepath)
+        self.assertEqual(pp.parse_cmd('echo "%(filepath)s"', info), 'echo "%s"' % info['filepath'])