Don't see a problem with this, can you add a line to the manpage too?
On Fri, Apr 10, 2015 at 07:00:03PM +0200, Cejka Rudolf wrote:
> Hello,
> would it be possible to allow negative length limit in format
> specification? For example, #{=10:pane_title} include first 10
> characters, while #{=-10:pane_title} would include last 10 characters?
>
> Maybe something like this? (tmux-1.9a)
>
> --- format.c.orig 2015-04-10 17:42:31.000000000 +0200
> +++ format.c 2015-04-10 18:34:26.000000000 +0200
> @@ -197,7 +197,7 @@
> char *copy, *copy0, *endptr, *ptr, *saved;
> const char *value;
> size_t valuelen;
> - u_long limit = ULONG_MAX;
> + long limit = LONG_MAX;
>
> /* Make a copy of the key. */
> copy0 = copy = xmalloc(keylen + 1);
> @@ -210,8 +210,8 @@
> switch (*copy) {
> case '=':
> errno = 0;
> - limit = strtoul(copy + 1, &endptr, 10);
> - if (errno == ERANGE && limit == ULONG_MAX)
> + limit = strtol(copy + 1, &endptr, 10);
> + if (errno == ERANGE && (limit == LONG_MAX ||
> limit == LONG_MIN))
> goto fail;
> copy = endptr;
> break;
> @@ -259,7 +259,11 @@
> valuelen = strlen(value);
>
> /* Truncate the value if needed. */
> - if (valuelen > limit)
> + if (limit < 0 && valuelen > -limit) {
> + value += valuelen + limit;
> + valuelen = -limit;
> + }
> + if (limit >= 0 && valuelen > limit)
> valuelen = limit;
>
> /* Expand the buffer and copy in the value. */
>
> --
> Rudolf Cejka <cejkar at fit.vutbr.cz> http://www.fit.vutbr.cz/~cejkar
> Brno University of Technology, Faculty of Information Technology
> Bozetechova 2, 612 66 Brno, Czech Republic
>
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