[pp:exec] use non-UNC path replacements (#8879)

provide '{_path_unc}' and '{_directory_unc}' replacement fields

gallery_dl/option.py

@@ -899,7 +899,8 @@ def build_parser():
         action=AppendCommandAction, const={"name": "exec"},
         help=("Execute CMD for each downloaded file. "
               "Supported replacement fields are "
-              "{} or {_path}, {_directory}, {_filename}. "
+              "{} or {_path}, {_temppath}, {_directory}, {_filename}. "
+              "On Windows, use {_path_unc} or {_directory_unc} for UNC paths. "
               "Example: --exec \"convert {} {}.png && rm {}\""),
     )
     postprocessor.add_argument(

gallery_dl/postprocessor/exec.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-# Copyright 2018-2023 Mike Fährmann
+# Copyright 2018-2026 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -61,7 +61,8 @@ class ExecPP(PostProcessor):
     def _prepare_cmd(self, cmd):
         if isinstance(cmd, str):
             self._sub = util.re(
-                r"\{(_directory|_filename|_(?:temp)?path|)\}").sub
+                r"(?i)\{(_directory(?:_unc)?|_filename"
+                r"|_(?:temp)?path(?:_unc)?|)\}").sub
             return self.exec_string, cmd
         else:
             return self.exec_list, [formatter.parse(arg) for arg in cmd]
@@ -73,10 +74,13 @@ class ExecPP(PostProcessor):
         if archive and archive.check(kwdict):
             return
 
-        kwdict["_directory"] = pathfmt.realdirectory
+        kwdict["_directory"] = pathfmt.directory
         kwdict["_filename"] = pathfmt.filename
         kwdict["_temppath"] = pathfmt.temppath
-        kwdict["_path"] = pathfmt.realpath
+        kwdict["_path"] = pathfmt.path
+        if util.WINDOWS:
+            kwdict["_directory_unc"] = pathfmt.realdirectory
+            kwdict["_path_unc"] = pathfmt.realpath
 
         args = [arg.format_map(kwdict) for arg in self.args]
         args[0] = os.path.expanduser(args[0])
@@ -133,14 +137,17 @@ class ExecPP(PostProcessor):
         )
 
     def _replace(self, match):
-        name = match[1]
-        if name == "_directory":
-            return quote(self.pathfmt.realdirectory)
-        if name == "_filename":
-            return quote(self.pathfmt.filename)
-        if name == "_temppath":
-            return quote(self.pathfmt.temppath)
-        return quote(self.pathfmt.realpath)
+        attr = {
+            ""              : "path",
+            "_path"         : "path",
+            "_path_unc"     : "realpath",
+            "_temppath"     : "temppath",
+            "_temppath_unc" : "temppath",
+            "_directory"    : "directory",
+            "_directory_unc": "realdirectory",
+            "_filename"     : "filename",
+        }[match[1].lower()]
+        return quote(getattr(self.pathfmt, attr))
 
 
 __postprocessor__ = ExecPP