This adds a i_wcwidth() function that replaces mk_wcwidth(), and a
'wcwidth_implementation' setting to pick which one it wraps.
Values:
- old: uses our local mk_wcwidth() which implements unicode 5.0
- system: uses the libc-provided wcwidth(), which may be better or worse
than ours depending on how up to date the system is.
- auto: tests the system one against two characters that became
fullwidth in unicode 5.2 and 9.0 respectively. If either of them pass,
pick the system implementation, otherwise pick ours.
It defaults to auto.
mk_wcwidth() is still preferable in some cases, since the way it uses
ranges for fullwidth characters means most CJK blocks are covered even
if their characters didn't exist back then.
The "system" implementation is also wrapped to never return -1, but to
assume those unknown characters use one cell. Quoting the code:
/* Treat all unknown characters as taking one cell. This is
* the reason mk_wcwidth and other outdated implementations
* mostly worked with newer unicode, while glibc's wcwidth
* needs updating to recognize new characters.
*
* Instead of relying on that, we keep the behavior of assuming
* one cell even for glibc's implementation, which is still
* highly accurate and less of a headache overall.
*/
Some programs and users send SIGWINCH as a request for the client to redraw
in the event of session detachment/reattachment (e.g. abduco). A well-formed
terminal will only send SIGWINCH when the window size has changed, so there
is no need to optimise this case out.
This patch adds support for the OTR protocol to irssi. This is an import
of the external irssi-otr project that we are now taking over
maintership for.
Major thanks to the original authors of Irssi-OTR: Uli Meis and David
Goulet. Thanks to the OTR community in #OTR on OFTC, thanks to everyone
who have helped testing the patches and submitted UI suggestions.
