Release of version 3.3.3

Workaround for #84.

instaloader.py

@@ -6,6 +6,7 @@ import getpass
 import json
 import os
 import pickle
+import platform
 import random
 import re
 import shutil
@@ -29,8 +30,14 @@ import requests.utils
 import urllib3
 
 
-__version__ = '3.3.2'
+__version__ = '3.3.3'
 
+# NOTE: duplicated in README.rst and docs/index.rst
+USAGE_STRING = """
+{0} [--comments] [--geotags] [--stories]
+            [--login YOUR-USERNAME] [--fast-update]
+            profile | "#hashtag" | :stories | :feed | :saved
+{0} --help""".format(sys.argv[0])
 
 try:
     # pylint:disable=wrong-import-position
@@ -127,10 +134,10 @@ def mediaid_to_shortcode(mediaid: int) -> str:
     return b64encode(mediaid.to_bytes(9, 'big'), b'-_').decode().replace('A', ' ').lstrip().replace(' ','A')
 
 
-def format_string_contains_key(format_string: str, key: str) -> bool:
+def format_string_contains_key(format_string: '_PathPattern', key: str) -> bool:
     # pylint:disable=unused-variable
     for literal_text, field_name, format_spec, conversion in string.Formatter().parse(format_string):
-        if field_name == key or field_name.startswith(key + '.'):
+        if field_name and (field_name == key or field_name.startswith(key + '.')):
             return True
     return False
 
@@ -440,6 +447,14 @@ class Tristate(Enum):
     always = 2
 
 
+class _PathPattern(str):
+    """Class overriding :meth:`str.format` for character substitution in paths for Windows, see issue #84."""
+
+    def format(self, *args: Any, **kwargs: Any) -> str:
+        ret = super().format(*args, **kwargs)
+        return ret.replace(':', '\ua789') if platform.system() == 'Windows' else ret
+
+
 class Instaloader:
     GRAPHQL_PAGE_LENGTH = 200
 
@@ -462,18 +477,19 @@ class Instaloader:
         self.username = None
         self.sleep = sleep
         self.quiet = quiet
-        self.dirname_pattern = dirname_pattern if dirname_pattern is not None else '{target}'
+        self.dirname_pattern = _PathPattern(dirname_pattern if dirname_pattern is not None else '{target}')
         if filename_pattern is not None:
             filename_pattern = re.sub(r"({(?:post\.)?date)([:}])", r"\1_utc\2", filename_pattern)
             self.filename_pattern_old = filename_pattern.replace('{date_utc}', '{date_utc:%Y-%m-%d_%H-%M-%S}')
-            self.filename_pattern_old = re.sub(r"(?i)({(?:post\.)?date_utc:[^}]*?)_UTC",
-                                               r"\1", self.filename_pattern_old)
+            self.filename_pattern_old = _PathPattern(re.sub(r"(?i)({(?:post\.)?date_utc:[^}]*?)_UTC",
+                                                            r"\1", self.filename_pattern_old))
             filename_pattern = re.sub(r"(?i)({(date_utc|post\.date_utc):(?![^}]*UTC[^}]*).*?)}",
                                       r"\1_UTC}", filename_pattern)
-            self.filename_pattern = filename_pattern.replace('{date_utc}', '{date_utc:%Y-%m-%d_%H-%M-%S_UTC}')
+            self.filename_pattern = _PathPattern(filename_pattern.replace('{date_utc}',
+                                                                          '{date_utc:%Y-%m-%d_%H-%M-%S_UTC}'))
         else:
-            self.filename_pattern = '{date_utc:%Y-%m-%d_%H-%M-%S_UTC}'
-            self.filename_pattern_old = '{date_utc:%Y-%m-%d_%H-%M-%S}'
+            self.filename_pattern = _PathPattern('{date_utc:%Y-%m-%d_%H-%M-%S_UTC}')
+            self.filename_pattern_old = _PathPattern('{date_utc:%Y-%m-%d_%H-%M-%S}')
         self.download_videos = download_videos
         self.download_video_thumbnails = download_video_thumbnails
         self.download_geotags = download_geotags
@@ -1581,6 +1597,14 @@ class Instaloader:
         # Save session if it is useful
         if username is not None:
             self.save_session_to_file(sessionfile)
+        # User might be confused if Instaloader does nothing
+        if not profilelist:
+            if self.is_logged_in:
+                # Instaloader did at least save a session file
+                self._log("No targets were specified, thus nothing has been downloaded.")
+            else:
+                # Instloader did not do anything
+                self._log("usage:"+USAGE_STRING)
         if self.error_log:
             print("\nErrors occured:", file=sys.stderr)
             for err in self.error_log:
@@ -1588,7 +1612,7 @@ class Instaloader:
 
 
 def main():
-    parser = ArgumentParser(description=__doc__, add_help=False,
+    parser = ArgumentParser(description=__doc__, add_help=False, usage=USAGE_STRING,
                             epilog="Report issues at https://github.com/instaloader/instaloader/issues. "
                                    "The complete documentation can be found at "
                                    "https://instaloader.github.io/.")