Use UTF-8 line drawing characters on UTF-8 terminals. Fixes some stupid

terminals (I'm looking at you, putty) which disable the vt100 ACS mode
switching sequences in UTF-8 mode.

Also on terminals without ACS at all, use ASCII equivalents where
obvious.

1 files changed, 97 insertions, 0 deletions

diff --git a/tty-acs.c b/tty-acs.c
new file mode 100644
index 00000000..297c51ac
--- /dev/null
+++ b/tty-acs.c
@@ -0,0 +1,97 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2010 Nicholas Marriott <nicm@users.sourceforge.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+
+#include "tmux.h"
+
+int	tty_acs_cmp(const void *, const void *);
+
+/* Table mapping ACS entries to UTF-8. */
+struct tty_acs_entry {
+	u_char	 	 key;
+	const char	*string;
+};
+const struct tty_acs_entry tty_acs_table[] = {
+	{ '+', "\342\206\222" },
+	{ ',', "\342\206\220" },
+	{ '-', "\342\206\221" },
+	{ '.', "\342\206\223" },
+	{ '0', "\342\226\256" },
+	{ '`', "\342\227\206" },
+	{ 'a', "\342\226\222" },
+	{ 'f', "\302\260" },
+	{ 'g', "\302\261" },
+	{ 'h', "\342\226\222" },
+	{ 'i', "\342\230\203" },
+	{ 'j', "\342\224\230" },
+	{ 'k', "\342\224\220" },
+	{ 'l', "\342\224\214" },
+	{ 'm', "\342\224\224" },
+	{ 'n', "\342\224\274" },
+	{ 'o', "\342\216\272" },
+	{ 'p', "\342\216\273" },
+	{ 'q', "\342\224\200" },
+	{ 'r', "\342\216\274" },
+	{ 's', "\342\216\275" },
+	{ 't', "\342\224\234" },
+	{ 'u', "\342\224\244" },
+	{ 'v', "\342\224\264" },
+	{ 'w', "\342\224\254" },
+	{ 'x', "\342\224\202" },
+	{ 'y', "\342\211\244" },
+	{ 'z', "\342\211\245" },
+	{ '{', "\317\200" },
+	{ '|', "\342\211\240" },
+	{ '}', "\302\243" },
+	{ '~', "\302\267" }
+};
+
+int
+tty_acs_cmp(const void *key, const void *value)
+{
+	const struct tty_acs_entry	*entry = value;
+	u_char				 ch;
+
+	ch = *(u_char *) key;
+	return (ch - entry->key);
+}
+
+/* Retrieve ACS to output as a string. */
+const char *
+tty_acs_get(struct tty *tty, u_char ch)
+{
+	struct tty_acs_entry *entry;
+
+	/* If not a UTF-8 terminal, use the ACS set. */
+	if (!(tty->flags & TTY_UTF8)) {
+		if (tty->term->acs[ch][0] == '\0')
+			return (NULL);
+		return (&tty->term->acs[ch][0]);
+	}
+
+	/* Otherwise look up the UTF-8 translation. */
+	entry = bsearch(&ch,
+	    tty_acs_table, nitems(tty_acs_table), sizeof tty_acs_table[0],
+	    tty_acs_cmp);
+	if (entry == NULL)
+		return (NULL);
+	return (entry->string);
+}