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54903au_exists bug, was Re: Test Existence of Autocommand?

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  • Bram Moolenaar
    Sep 3, 2009
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      Bob Hiestand wrote:

      > On Tue, Aug 25, 2009 at 11:38 AM, Ben Fritz<fritzophrenic@...> wrote:
      > >> On Fri, Aug 14, 2009 at 6:38 PM, Edward Beach<beach9...@...> wrote:
      > >> > I'm trying to write a script that will toggle an autocommand on/off
      > >> > and I'm looking for a function to return it's existence. I've found
      > >> > the built-in exists function and from the help it gives me this:
      > >> > #group#event autocommand defined for this group and event.
      > >> > So from my command line I enter in the following
      > >> > :aug TestGroup | aug END | echo exists("#TestGroup#BufWritePost")
      > >> > and it comes back 1 -- but shouldn't it be 0 since I haven't created a
      > >> > BufWritePost event and since
      > >> > :au TestGroup
      > >> > returns nothing?
      > >>
      > >> It looks like the #group#event code doesn't check for an autocommand
      > >> for that event being defined *within* the group, just whether both the
      > >> group and the autocommand exist. The #group#event#pattern does check
      > >> for an autocommand defined within the specified group, though, so that
      > >> may be helpful to you.
      >
      > > Since this is a patch for some VERY unexpected behavior, I'm cc'ing
      > > vim_dev where such things are normally discussed.
      > >
      > > My opinion is that this is a bug, if it can be reliably reproduced. I
      > > can't imagine any situation where the described behavior would be
      > > helpful.
      >
      > Here's a probably better patch, and a test case to show the behavior I
      > expect from exists() with respect to autocommands:

      Thanks for the patch and testcase script. Would you be able to turn the
      script into a test for src/testdir? That will greatly help avoid
      regressions.

      --
      hundred-and-one symptoms of being an internet addict:
      178. You look for an icon to double-click to open your bedroom window.

      /// Bram Moolenaar -- Bram@... -- http://www.Moolenaar.net \\\
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