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142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*
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wcwidth-wrapper.c : irssi
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Copyright (C) 2018 dequis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#define _GNU_SOURCE
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#include <wchar.h>
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#include "module.h"
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#include <irssi/src/core/signals.h>
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#include <irssi/src/core/settings.h>
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#include <irssi/src/core/utf8.h>
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#ifdef HAVE_LIBUTF8PROC
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#include <utf8proc.h>
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#endif
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/* wcwidth=2 since unicode 5.2.0 */
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#define UNICODE_SQUARE_HIRAGANA_HOKA 0x1F200
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/* wcwidth=2 since unicode 9.0.0 */
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#define UNICODE_IRSSI_LOGO 0x1F525
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enum {
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WCWIDTH_IMPL_OLD,
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WCWIDTH_IMPL_SYSTEM
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#ifdef HAVE_LIBUTF8PROC
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,WCWIDTH_IMPL_JULIA
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#endif
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};
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WCWIDTH_FUNC wcwidth_impl_func = mk_wcwidth;
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int i_wcwidth(unichar ucs)
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{
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return (*wcwidth_impl_func)(ucs);
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}
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static int system_wcwidth(unichar ucs)
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{
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int retval = wcwidth((wchar_t) ucs);
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if (retval < 0) {
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/* Treat all unknown characters as taking one cell. This is
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* the reason mk_wcwidth and other outdated implementations
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* mostly worked with newer unicode, while glibc's wcwidth
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* needs updating to recognize new characters.
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*
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* Instead of relying on that, we keep the behavior of assuming
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* one cell even for glibc's implementation, which is still
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* highly accurate and less of a headache overall.
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*/
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return 1;
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}
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return retval;
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}
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#ifdef HAVE_LIBUTF8PROC
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/* wrapper because the function signatures are different
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* (the parameter is unsigned for us, signed for them) */
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static int julia_wcwidth(unichar ucs)
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{
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return utf8proc_charwidth(ucs);
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}
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#endif
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static void read_settings(void)
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{
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static int choice = -1;
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int newchoice;
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newchoice = settings_get_choice("wcwidth_implementation");
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if (choice == newchoice) {
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return;
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}
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choice = newchoice;
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switch (choice) {
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case WCWIDTH_IMPL_OLD:
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wcwidth_impl_func = &mk_wcwidth;
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break;
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case WCWIDTH_IMPL_SYSTEM:
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wcwidth_impl_func = &system_wcwidth;
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break;
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#ifdef HAVE_LIBUTF8PROC
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case WCWIDTH_IMPL_JULIA:
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wcwidth_impl_func = &julia_wcwidth;
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break;
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#endif
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}
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}
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void wcwidth_wrapper_init(void)
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{
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int wcwidth_impl_default = 0;
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/* Test against characters that have wcwidth=2
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* since unicode 5.2 and 9.0 respectively */
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if (system_wcwidth(UNICODE_SQUARE_HIRAGANA_HOKA) == 2 ||
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system_wcwidth(UNICODE_IRSSI_LOGO) == 2) {
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wcwidth_impl_default = WCWIDTH_IMPL_SYSTEM;
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} else {
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/* Fall back to our own (which implements 5.0) */
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wcwidth_impl_default = WCWIDTH_IMPL_OLD;
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}
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#ifdef HAVE_LIBUTF8PROC
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settings_add_choice("misc", "wcwidth_implementation", wcwidth_impl_default, "old;system;julia");
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#else
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settings_add_choice("misc", "wcwidth_implementation", wcwidth_impl_default, "old;system");
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#endif
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read_settings();
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signal_add_first("setup changed", (SIGNAL_FUNC) read_settings);
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}
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void wcwidth_wrapper_deinit(void)
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{
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signal_remove("setup changed", (SIGNAL_FUNC) read_settings);
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}
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