add '--abort-on-skip' option and ability to control skip behavior

the 'skip' config option controls skipping behavior:
    true    - skip download if file already exist (default)
    false   - download and overwrite files even if it exists
    "abort" - abort extractor run if a download would be skipped
              (same as '--abort-on-skip')

gallery_dl/extractor/hbrowse.py

@@ -19,7 +19,7 @@ class HbrowseMangaExtractor(Extractor):
     subcategory = "manga"
     pattern = [r"(?:https?://)?(?:www\.)?hbrowse\.com/(\d+)/?$"]
     test = [("http://www.hbrowse.com/10363", {
-        "url": "b89682bfb86c11d2af0dc47463804ec3ac4aadd6",
+        "url": "4d9def5df21c23f8c3d36de2076c189c02ea43bd",
     })]
 
     def __init__(self, match):

gallery_dl/option.py

@@ -22,6 +22,12 @@ class ConfigAction(argparse.Action):
         namespace.options.append(((self.dest,), values))
 
 
+class ConfigConstAction(argparse.Action):
+    """Set argparse const values as config values"""
+    def __call__(self, parser, namespace, values, option_string=None):
+        namespace.options.append(((self.dest,), self.const))
+
+
 class ParseAction(argparse.Action):
     """Parse <key>=<value> options and set them as config values"""
     def __call__(self, parser, namespace, values, option_string=None):
@@ -98,6 +104,12 @@ def build_parser():
         metavar="ITEM-SPEC", action=ConfigAction, dest="chapters",
         help=("Same as '--images' except for chapters")
     )
+    parser.add_argument(
+        "--abort-on-skip",
+        action=ConfigConstAction, nargs=0, dest="skip", const="abort",
+        help=("Abort extractor run if a file download would normally be "
+              "skipped, i.e. if a file with the same filename already exists")
+    )
     parser.add_argument(
         "-R", "--retries",
         metavar="RETRIES", action=ConfigAction, dest="retries", type=int,
@@ -105,7 +117,7 @@ def build_parser():
     )
     parser.add_argument(
         "--http-timeout",
-        metavar="SECONDS", action=ConfigAction, dest="timeout", type=int,
+        metavar="SECONDS", action=ConfigAction, dest="timeout", type=float,
         help="Timeout for HTTP connections (defaut: no timeout)",
     )
     parser.add_argument(

gallery_dl/util.py

@@ -133,26 +133,27 @@ class RangePredicate():
 class PathFormat():
 
     def __init__(self, extractor):
-        key = ["extractor", extractor.category]
+        self.filename_fmt = extractor.config(
-        if extractor.subcategory:
+            "filename", extractor.filename_fmt)
-            key.append(extractor.subcategory)
+        self.directory_fmt = extractor.config(
-        self.filename_fmt = config.interpolate(
+            "directory", extractor.directory_fmt)
-            key + ["filename"], default=extractor.filename_fmt
-        )
-        self.directory_fmt = config.interpolate(
-            key + ["directory"], default=extractor.directory_fmt
-        )
         self.has_extension = False
         self.keywords = {}
         self.directory = self.realdirectory = ""
         self.path = self.realpath = ""
 
+        skipmode = extractor.config("skip", True)
+        if skipmode == "abort":
+            self.exists = self._exists_abort
+        elif not skipmode:
+            self.exists = self._exists_false
+
     def open(self):
-        """Open file ta 'realpath' and return a corresponding file object"""
+        """Open file to 'realpath' and return a corresponding file object"""
         return open(self.realpath, "wb")
 
     def exists(self):
-        """Return True if 'path' is complete and referse to an existing path"""
+        """Return True if 'path' is complete and refers to an existing path"""
         if self.has_extension:
             return os.path.exists(self.realpath)
         return False
@@ -189,6 +190,15 @@ class PathFormat():
         self.path = self.directory + sep + filename
         self.realpath = self.realdirectory + sep + filename
 
+    def _exists_abort(self):
+        if self.has_extension and os.path.exists(self.realpath):
+            raise exception.StopExtraction()
+        return False
+
+    @staticmethod
+    def _exists_false():
+        return False
+
     @staticmethod
     def get_base_directory():
         """Return the base-destination-directory for downloads"""

gallery_dl/version.py

@@ -6,4 +6,4 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-__version__ = "0.8.3"
+__version__ = "0.8.4-dev"

test/test_extractors.py

@@ -51,7 +51,7 @@ skip = [
     # dont work on travis-ci
     "exhentai", "kissmanga", "mangafox", "dynastyscans",
     # temporary issues
-    "fallenangels",
+
 ]
 # enable selective testing for direct calls
 if __name__ == '__main__' and len(sys.argv) > 1: