[postprocessor:exec] add a better error message (#155)

2019-01-13 13:59:11 +01:00
parent 89df37a173
commit 5f38ac9609
2 changed files with 8 additions and 2 deletions
--- a/gallery_dl/postprocessor/exec.py
+++ b/gallery_dl/postprocessor/exec.py
@@ -16,7 +16,13 @@ class ExecPP(PostProcessor):

    def __init__(self, pathfmt, options):
        PostProcessor.__init__(self)
-        self.args = options["command"]
+
+        try:
+            self.args = options["command"]
+            self.args[0]  # test if 'args' is subscriptable
+        except (KeyError, IndexError, TypeError):
+            raise TypeError("option 'command' must be a non-empty list")
+
        if options.get("async", False):
            self._exec = subprocess.Popen