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Check the terminfo(5) U8 capability and disable using UTF-8 for ACS if

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it is present and zero. This is useful for users with terminals or fonts
that do not correctly support UTF-8 line drawing characters. GitHub
issue 927, reported by Hiroaki Yamazoe and Akinori Hattori.
This commit is contained in:
nicm 2017-05-15 16:44:04 +00:00
parent b160de5cb4
commit 1ba7f1d03f
4 changed files with 45 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tmux.h
View File

@ -401,6 +401,7 @@ enum tty_code_code {
TTYC_SS, /* set cursor style, Ss */
TTYC_TC, /* 24-bit "true" colour, Tc */
TTYC_TSL, /* to_status_line, tsl */
TTYC_U8,
TTYC_VPA, /* row_address, cv */
TTYC_XENL, /* eat_newline_glitch, xn */
TTYC_XT, /* xterm(1)-compatible title, XT */
@ -1701,6 +1702,7 @@ int tty_term_flag(struct tty_term *, enum tty_code_code);
const char *tty_term_describe(struct tty_term *, enum tty_code_code);
/* tty-acs.c */
int tty_acs_needed(struct tty *);
const char *tty_acs_get(struct tty *, u_char);
/* tty-keys.c */

37
tty-acs.c
View File

@ -74,23 +74,48 @@ tty_acs_cmp(const void *key, const void *value)
return (ch - entry->key);
}
/* Should this terminal use ACS instead of UTF-8 line drawing? */
int
tty_acs_needed(struct tty *tty)
{
if (tty == NULL)
return (0);
/*
* If the U8 flag is present, it marks whether a terminal supports
* UTF-8 and ACS together.
*
* If it is present and zero, we force ACS - this gives users a way to
* turn off UTF-8 line drawing.
*
* If it is nonzero, we can fall through to the default and use UTF-8
* line drawing on UTF-8 terminals.
*/
if (tty_term_has(tty->term, TTYC_U8) &&
tty_term_number(tty->term, TTYC_U8) == 0)
return (1);
if (tty->flags & TTY_UTF8)
return (0);
return (1);
}
/* Retrieve ACS to output as a string. */
const char *
tty_acs_get(struct tty *tty, u_char ch)
{
struct tty_acs_entry *entry;
struct tty_acs_entry *entry;
/* If not a UTF-8 terminal, use the ACS set. */
if (tty != NULL && !(tty->flags & TTY_UTF8)) {
/* Use the ACS set instead of UTF-8 if needed. */
if (tty_acs_needed(tty)) {
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);
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);

1
tty-term.c
View File

@ -254,6 +254,7 @@ static const struct tty_term_code_entry tty_term_codes[] = {
[TTYC_TC] = { TTYCODE_FLAG, "Tc" },
[TTYC_TSL] = { TTYCODE_STRING, "tsl" },
[TTYC_VPA] = { TTYCODE_STRING, "vpa" },
[TTYC_U8] = { TTYCODE_NUMBER, "U8" },
[TTYC_XENL] = { TTYCODE_FLAG, "xenl" },
[TTYC_XT] = { TTYCODE_FLAG, "XT" },
};

19
tty.c
View File

@ -71,8 +71,6 @@ static void tty_default_colours(struct grid_cell *,
static void tty_default_attributes(struct tty *, const struct window_pane *,
u_int);
#define tty_use_acs(tty) \
(tty_term_has((tty)->term, TTYC_ACSC) && !((tty)->flags & TTY_UTF8))
#define tty_use_margin(tty) \
((tty)->term_type == TTY_VT420)
@ -278,7 +276,8 @@ tty_open(struct tty *tty, char **cause)
void
tty_start_tty(struct tty *tty)
{
struct termios tio;
struct client *c = tty->client;
struct termios tio;
if (tty->fd != -1 && tcgetattr(tty->fd, &tty->tio) == 0) {
setblocking(tty->fd, 0);
@ -299,10 +298,14 @@ tty_start_tty(struct tty *tty)
tty_putcode(tty, TTYC_SMCUP);
tty_putcode(tty, TTYC_SMKX);
if (tty_use_acs(tty))
tty_putcode(tty, TTYC_ENACS);
tty_putcode(tty, TTYC_CLEAR);
if (tty_acs_needed(tty)) {
log_debug("%s: using capabilities for ACS", c->name);
tty_putcode(tty, TTYC_ENACS);
} else
log_debug("%s: using UTF-8 for ACS", c->name);
tty_putcode(tty, TTYC_CNORM);
if (tty_term_has(tty->term, TTYC_KMOUS))
tty_puts(tty, "\033[?1000l\033[?1002l\033[?1006l\033[?1005l");
@ -351,7 +354,7 @@ tty_stop_tty(struct tty *tty)
return;
tty_raw(tty, tty_term_string2(tty->term, TTYC_CSR, 0, ws.ws_row - 1));
if (tty_use_acs(tty))
if (tty_acs_needed(tty))
tty_raw(tty, tty_term_string(tty->term, TTYC_RMACS));
tty_raw(tty, tty_term_string(tty->term, TTYC_SGR0));
tty_raw(tty, tty_term_string(tty->term, TTYC_RMKX));
@ -1417,7 +1420,7 @@ tty_reset(struct tty *tty)
struct grid_cell *gc = &tty->cell;
if (!grid_cells_equal(gc, &grid_default_cell)) {
if ((gc->attr & GRID_ATTR_CHARSET) && tty_use_acs(tty))
if ((gc->attr & GRID_ATTR_CHARSET) && tty_acs_needed(tty))
tty_putcode(tty, TTYC_RMACS);
tty_putcode(tty, TTYC_SGR0);
memcpy(gc, &grid_default_cell, sizeof *gc);
@ -1767,7 +1770,7 @@ tty_attributes(struct tty *tty, const struct grid_cell *gc,
tty_putcode(tty, TTYC_INVIS);
if (changed & GRID_ATTR_STRIKETHROUGH)
tty_putcode(tty, TTYC_SMXX);
if ((changed & GRID_ATTR_CHARSET) && tty_use_acs(tty))
if ((changed & GRID_ATTR_CHARSET) && tty_acs_needed(tty))
tty_putcode(tty, TTYC_SMACS);
}