A criteria is a string in the form of `[class="regex.*" title="str"]`.
It is stored in a struct with a list of *tokens* which is a
attribute/value pair (stored as a `crit_token` struct). Most tokens will
also have a precompiled regex stored that will be used during criteria
matching.
for_window command: When a new view is created its metadata is tested
against all stored criteria, and if a match is found the associated
command list is executed.
Unfortunately some metadata is not available in sway at the moment
(specifically `instance`, `window_role` and `urgent`). Any criteria
string that tries to match an unsupported attribute will fail.
(Note that while the criteria code can be used to parse any criteria
string it is currently only used by the `for_window` command.)
When using the ninja generator:
$ cmake -G Ninja <dir>
$ ninja -C <dir>
This commit fixes the warning:
ninja: warning: multiple rules generate bin/wayland-desktop-shell-protocol.c. builds involving this target will not be correct; continuing anyway [-w dupbuild=warn]
This fixes a compiler warning:
../sway/extensions.c: In function ‘set_background’:
../sway/extensions.c:16:37: warning: implicit declaration of function ‘malloc’ [-Wimplicit-function-declaration]
struct background_config *config = malloc(sizeof(struct background_config));
^
../sway/extensions.c:16:37: warning: incompatible implicit declaration of built-in function ‘malloc’
../sway/extensions.c:16:37: note: include ‘<stdlib.h>’ or provide a declaration of ‘malloc’
We can't handle them currently (the criteria needs to e.g. be passed to
each command handler which then needs to do the right thing), so it's
better to just do nothing than to create unexpected results (because the
command was executed on the wrong view).
(Before this patch any command list with a criteria string would simply
fail to parse, so this is at least a step in the right direction.)
This also fixes a bug where issuing a new "workspace a output b" command
for an already assigned workspace would not work (the old config would
be found first and used instead).
Sometimes one has to traverse a list to find out if some data already
exists there in order to avoid dupilcates in the list, and this function
facilitates in that without requiring that the data is ordered.
