[scripts/options] make output width independent of terminal size

scripts/options.py

@@ -20,26 +20,32 @@ gallery_dl.util.EXECUTABLE = True
 from gallery_dl import option  # noqa E402
 
 
-TEMPLATE = """# Command-Line Options
+class Formatter(option.Formatter):
+    def __init__(self, prog):
+        option.argparse.HelpFormatter.__init__(
+            self, prog, max_help_position=30, width=77)
 
-<!-- auto-generated by {} -->
-
-{}"""
+    def add_usage(self, usage, actions, groups):
+        pass
 
 
 parser = option.build_parser()
-parser.usage = ""
+parser.formatter_class = Formatter
+parser.format_usage = lambda: ""
 
 opts = parser.format_help()
-opts = opts[8:]  # strip 'usage'
 opts = re.sub(r"(?m)^(\w+.*)", "## \\1", opts)  # group names to headings
 opts = opts.replace("\n  ", "\n    ")  # indent by 4
 
 
+SELF = "/".join(os.path.normpath(__file__).split(os.sep)[-2:])
 PATH = (sys.argv[1] if len(sys.argv) > 1 else
         util.path("docs", "options.md"))
+
 with util.lazy(PATH) as fp:
-    fp.write(TEMPLATE.format(
-        "/".join(os.path.normpath(__file__).split(os.sep)[-2:]),
-        opts,
-    ))
+    fp.write(f"""# Command-Line Options
+
+<!-- auto-generated by {SELF} -->
+
+
+{opts}""")