Zsh Mailing List Archive
Messages sorted by:
Re: Call for opinions on a couple of prospective zsh patches
- X-seq: zsh-users 2358
- From: Peter Stephenson <pws@xxxxxxxxxxxxxxxxx>
- To: zsh-users@xxxxxxxxxxxxxx
- Subject: Re: Call for opinions on a couple of prospective zsh patches
- Date: Sun, 06 Jun 1999 16:13:38 +0200
- In-reply-to: ""Bart Schaefer""'s message of "Sun, 06 Jun 1999 06:51:50 DFT." <990606065150.ZM9165@xxxxxxxxxxxxxxxxxxxxxxx>
- Mailing-list: contact zsh-users-help@xxxxxxxxxxxxxx; run by ezmlm
"Bart Schaefer" wrote:
> * Partial word motions in the face of mixed case, i.e. move the cursor to
> the next/previous capital letter InMixedCaseWordsLikeThisOne, including
> deletions that treat words this way. This is also handled by adding a
> few new ZLE builtins, and relies on isupper() to detect upper case, so
> it may behave differently in different language locales.
> My first inclination was to think that this should be handled with the
> WORDCHARS variable, but of course WORDCHARS adds other characters that
> are treated as alphanumeric; there's no way to say that upper case
> letters should -not- be treated as alphanumeric. I guess I'd prefer a
> patch that handled wordchar-exlusions more generically (without adding
> builtins) and I may even look at adding such a thing.
> For this patch to go into 3.0.6, I'd want PWS to agree that the new ZLE
> builtins would appear in 3.1.6, too.
Well, in 3.1 you can do more sophisticated things by altering $CURSOR with
widgets already, so new builtins are not really necessary. Furthermore,
getting a complete set of functions with this alternative word behaviour
looks a slightly wasteful way of doing it (and if it's an incomplete set of
functions, I guarantee it won't have the one you want).
But it would be nice to have some advance on $WORDCHARS, which has always
frustrated me (I always wanted to be able to specify characters which
*shouldn't* be parts of words, since $WORDCHARS is too long for me to see
easily what's not in it --- and how else can I tell the code that only
spaces should delimit words; and why does the default include =, - and /
but not +; parentheses but not |? Etc.).
Perhaps the solution to the problem in question is to add a variable
$WORDSTART giving a list of characters with this behaviour, and the
corresponding macro iwords(). It could allow ranges, so you can add "A-Z";
the change to inittyptab() to allow that isn't too drastic --- the change
to zle_word.c is the hairy one. That's less sophisticated w.r.t. locales,
unfortunately; you'd have to add ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞ by hand,
which is a little unpleasant. An alternative is to allow A to stand for
all upper case, 1 for all digits, etc; or to allow escape sequences, so \\
-> backslash, \U -> uppercase, etc (that's perhaps the neatest). I don't
see an easy way of avoiding a new variable by enhancing $WORDCHARS, since in
principle anything can appear in that. You could, say, have a list of
possible initial characters after two spaces, but it's a bit of a mess.
Perhaps, if my frustrations above are widespread, there's room for a
variable $NONWORDCHARS, too. That's easy to add: by default it's not set,
and if it is it takes precedence over $WORDCHARS in inittyptab() so that
anything not in it is made a word character; no editing code needs to
change. Can this be made to the job of $WORDSTART? It seems to me not,
since forward-word puts the cursor *after* the non-word character, which
isn't what you want with special initial characters (they're behaving more
like special final characters, in fact).
Peter Stephenson <pws@xxxxxxxxxxxxxxxxx> Tel: +39 050 844536
Dipartimento di Fisica, Via Buonarroti 2, 56127 Pisa, Italy
Messages sorted by: