keysyms: Add aliases for media keys

Part-of: <https://gitlab.freedesktop.org/xorg/proto/xorgproto/-/merge_requests/93>

include/X11/XF86keysym.h

@@ -108,6 +108,7 @@
 #define XF86XK_ApplicationRight      0x1008ff51  /* switch to application, right*/
 #define XF86XK_Book                  0x1008ff52  /* Launch bookreader           */
 #define XF86XK_CD                    0x1008ff53  /* Launch CD/DVD player        */
+#define XF86XK_MediaSelectCD         0x1008ff53  /* Alias for XF86XK_CD         */
 #define XF86XK_Calculater            0x1008ff54  /* Launch Calculater           */
 #define XF86XK_Clear                 0x1008ff55  /* Clear window, screen        */
 #define XF86XK_Close                 0x1008ff56  /* Close window                */
@@ -275,6 +276,8 @@
  * The format for #defines is strict:
  *
  *     #define XF86XK_Foo<spaces…>_EVDEVK(0xABC)<spaces…> |* kver KEY_FOO *|
+ *     #define XF86XK_Foo<spaces…>_EVDEVK(0xABC)<spaces…> |* Alias for XF86XK_Bar *|
+ *     #define XF86XK_Foo<spaces…>_EVDEVK(0xABC)<spaces…> |* Deprecated alias for XF86XK_Bar *|
  *
  * Where
  * - alignment by spaces
@@ -348,13 +351,14 @@
 #define XF86XK_MediaSelectVCRPlus       _EVDEVK(0x17c)  /* v2.5.26 KEY_VCR2 */
 #define XF86XK_MediaSelectSatellite     _EVDEVK(0x17d)  /* v2.5.26 KEY_SAT */
 /* TODO: unclear media selector         _EVDEVK(0x17e)     v2.5.26 KEY_SAT2 */
-/* Use: XF86XK_CD                       _EVDEVK(0x17f)     v2.5.26 KEY_CD */
+/* Use: XF86XK_MediaSelectCD            _EVDEVK(0x17f)     v2.5.26 KEY_CD */
 #define XF86XK_MediaSelectTape          _EVDEVK(0x180)  /* v2.5.26 KEY_TAPE */
 #define XF86XK_MediaSelectRadio         _EVDEVK(0x181)  /* v2.5.26 KEY_RADIO */
 #define XF86XK_MediaSelectTuner         _EVDEVK(0x182)  /* v2.5.26 KEY_TUNER */
 #define XF86XK_MediaPlayer              _EVDEVK(0x183)  /* v2.5.26 KEY_PLAYER */
 #define XF86XK_MediaSelectTeletext      _EVDEVK(0x184)  /* v2.5.26 KEY_TEXT */
 #define XF86XK_DVD                      _EVDEVK(0x185)  /* v2.5.26 KEY_DVD */
+#define XF86XK_MediaSelectDVD           _EVDEVK(0x185)  /* Alias for XF86XK_DVD */
 #define XF86XK_MediaSelectAuxilliary    _EVDEVK(0x186)  /* v2.5.26 KEY_AUX */
 /* TODO: unclear media selector         _EVDEVK(0x187)     v2.5.26 KEY_MP3 */
 #define XF86XK_Audio                    _EVDEVK(0x188)  /* v2.5.26 KEY_AUDIO */

scripts/keysym-generator.py

@@ -191,11 +191,14 @@ def verify(ns):
 
     # This is the full pattern we expect.
     expected_pattern = re.compile(
-        r"#define XF86XK_\w+ +_EVDEVK\(0x([0-9A-Fa-f]{3})\) +/\* (v[2-6]\.[0-9]+(\.[0-9]+)?)? +KEY_\w+ \*/"
+        r"#define XF86XK_\w+ +_EVDEVK\(0x([0-9A-Fa-f]{3})\) +"
+        r"/\* (?:(?P<kernel_version>v[2-6]\.[0-9]+(\.[0-9]+)?)? +KEY_\w+|"
+        r"(?P<alias>Alias for XF86XK_\w+)) \*/"
     )
     # This is the comment pattern we expect
     expected_comment_pattern = re.compile(
-        r"/\* Use: (?P<name>\w+) +_EVDEVK\(0x(?P<value>[0-9A-Fa-f]{3})\) +   (v[2-6]\.[0-9]+(\.[0-9]+)?)? +KEY_\w+ \*/"
+        r"/\* Use: (?P<name>\w+) +_EVDEVK\(0x(?P<value>[0-9A-Fa-f]{3})\) +   "
+        r"(v[2-6]\.[0-9]+(\.[0-9]+)?)? +KEY_\w+ \*/"
     )
 
     # Some patterns to spot specific errors, just so we can print useful errors
@@ -204,8 +207,11 @@ def verify(ns):
     space_check = re.compile(r"#define \w+(\s+)[^\s]+(\s+)")
     hex_pattern = re.compile(r".*0x([a-f0-9]+).*", re.I)
     todo_pattern = re.compile(r"^/\* TODO.*\*/$")
-    comment_format = re.compile(r".*/\* ([^\s]+)?\s+(\w+)")
+    comment_format = re.compile(
+        r".*/\* (?:(?:Deprecated a|A)lias for (\w+)|([^\s]+)?\s+(\w+))"
+    )
     kver_format = re.compile(r"v[2-6]\.[0-9]+(\.[0-9]+)?")
+    alias_format = re.compile(r"(?:Deprecated a|A)lias for XF86XK_\w+")
 
     in_evdev_codes_section = False
     had_evdev_codes_section = False
@@ -292,11 +298,14 @@ def verify(ns):
                 comment = re.match(comment_format, line)
                 if not comment:
                     error("Invalid comment format", line)
-                kver = comment.group(1)
+                if alias_target := comment.group(1):
-                if kver and not re.match(kver_format, kver):
+                    alias = True
+                else:
+                    alias = False
+                    if (kver := comment.group(2)) and not re.match(kver_format, kver):
                         error("Invalid kernel version format", line)
 
-                keyname = comment.group(2)
+                    keyname = comment.group(3)
                     if not keyname.startswith("KEY_") or keyname.upper() != keyname:
                         error("Kernel keycode name invalid", line)
 
@@ -313,7 +322,7 @@ def verify(ns):
                 keycode = int(match.group(1), 16)
                 if keycode < last_keycode:
                     error("Keycode must be ascending", line)
-                if keycode == last_keycode:
+                if keycode == last_keycode and not alias:
                     error("Duplicate keycode", line)
 
                 # May cause a false positive for old libevdev if KEY_MAX is bumped