options: make --screenshot-directory/--watch-later-directory aliases

By popular demand I guess.

DOCS/interface-changes.rst

@@ -104,8 +104,8 @@ Interface changes
     - rename `--fps` to `--container-fps-override`
     - rename `--override-display-fps` to `--display-fps-override`
     - rename `--sub-ass-force-style` to `--sub-ass-style-overrides`
-    - rename `--screenshot-directory` to `--screenshot-dir`
-    - rename `--watch-later-directory` to `--watch-later-dir`
+    - alias `--screenshot-directory` to `--screenshot-dir`
+    - alias `--watch-later-directory` to `--watch-later-dir`
     - rename `--play-dir` to `--play-direction`
     - `--js-memory-report` is now used for enabling memory reporting for javascript
       scripts

DOCS/man/options.rst

@@ -1047,6 +1047,8 @@ Watch Later
 ``--watch-later-dir=<path>``
     The directory in which to store the "watch later" temporary files.
 
+    ``--watch-later-directory`` is an alias for ``--watch-later-dir``.
+
     If this option is unset, the files will be stored in a subdirectory
     named "watch_later" underneath the local state directory
     (usually ``~/.local/state/mpv/``).
@@ -4470,6 +4472,8 @@ Screenshot
     generated by ``--screenshot-template``. If the template filename is already
     absolute, the directory is ignored.
 
+    ``--screenshot-directory`` is an alias for ``--screenshot-dir``.
+
     If the directory does not exist, it is created on the first screenshot. If
     it is not a directory, an error is generated when trying to write a
     screenshot.

options/options.c

@@ -759,6 +759,7 @@ static const m_option_t mp_opts[] = {
         OPT_BOOL(ignore_path_in_watch_later_config)},
     {"watch-later-dir", OPT_STRING(watch_later_dir),
         .flags = M_OPT_FILE},
+    {"watch-later-directory", OPT_ALIAS("watch-later-dir")},
     {"watch-later-options", OPT_STRINGLIST(watch_later_options)},
 
     {"ordered-chapters", OPT_BOOL(ordered_chapters)},
@@ -820,6 +821,7 @@ static const m_option_t mp_opts[] = {
     {"screenshot-template", OPT_STRING(screenshot_template)},
     {"screenshot-dir", OPT_STRING(screenshot_dir),
         .flags = M_OPT_FILE},
+    {"screenshot-directory", OPT_ALIAS("screenshot-dir")},
     {"screenshot-sw", OPT_BOOL(screenshot_sw)},
 
     {"", OPT_SUBSTRUCT(resample_opts, resample_conf)},
@@ -890,9 +892,7 @@ static const m_option_t mp_opts[] = {
     {"", OPT_SUBSTRUCT(encode_opts, encode_config)},
 
     {"play-dir", OPT_REPLACED("play-direction")},
-    {"screenshot-directory", OPT_REPLACED("screenshot-dir")},
     {"sub-forced-only", OPT_REPLACED("sub-forced-events-only")},
-    {"watch-later-directory", OPT_REPLACED("watch-later-dir")},
     {0}
 };