updated for version 7.4.414
Problem: Cannot define a command only when it's used.
Solution: Add the CmdUndefined autocommand event. (partly by Yasuhiro
Matsumoto)
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index fecb653..6826951 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -2143,6 +2143,26 @@
/* Find the command and let "p" point to after it. */
p = find_command(&ea, NULL);
+#ifdef FEAT_AUTOCMD
+ /* If this looks like an undefined user command and there are CmdUndefined
+ * autocommands defined, trigger the matching autocommands. */
+ if (p != NULL && ea.cmdidx == CMD_SIZE && !ea.skip
+ && ASCII_ISUPPER(*ea.cmd)
+ && has_cmdundefined())
+ {
+ char_u *p = ea.cmd;
+ int ret;
+
+ while (ASCII_ISALNUM(*p))
+ ++p;
+ p = vim_strnsave(ea.cmd, p - ea.cmd);
+ ret = apply_autocmds(EVENT_CMDUNDEFINED, p, p, TRUE, NULL);
+ vim_free(p);
+ if (ret && !aborting())
+ p = find_command(&ea, NULL);
+ }
+#endif
+
#ifdef FEAT_USR_CMDS
if (p == NULL)
{