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Fix various confusion about am vs xenl.

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This commit is contained in:
nicm
2020-06-05 09:32:15 +00:00
parent 4e5e2c19d0
commit c908d2039f
3 changed files with 22 additions and 17 deletions
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17
tty-term.c
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@ -54,6 +54,7 @@ struct tty_term_code_entry {
static const struct tty_term_code_entry tty_term_codes[] = {
[TTYC_ACSC] = { TTYCODE_STRING, "acsc" },
[TTYC_AM] = { TTYCODE_FLAG, "am" },
[TTYC_AX] = { TTYCODE_FLAG, "AX" },
[TTYC_BCE] = { TTYCODE_FLAG, "bce" },
[TTYC_BEL] = { TTYCODE_STRING, "bel" },
@ -274,7 +275,6 @@ static const struct tty_term_code_entry tty_term_codes[] = {
[TTYC_TSL] = { TTYCODE_STRING, "tsl" },
[TTYC_U8] = { TTYCODE_NUMBER, "U8" },
[TTYC_VPA] = { TTYCODE_STRING, "vpa" },
[TTYC_XENL] = { TTYCODE_FLAG, "xenl" },
[TTYC_XT] = { TTYCODE_FLAG, "XT" }
};
@ -580,17 +580,22 @@ tty_term_create(struct tty *tty, char *name, int *feat, int fd, char **cause)
tty_term_apply_overrides(term);
/*
* Terminals without xenl (eat newline glitch) wrap at at $COLUMNS - 1
* Terminals without am (auto right margin) wrap at at $COLUMNS - 1
* rather than $COLUMNS (the cursor can never be beyond $COLUMNS - 1).
*
* This is irritating, most notably because it is impossible to write
* to the very bottom-right of the screen without scrolling.
* Terminals without xenl (eat newline glitch) ignore a newline beyond
* the right edge of the terminal, but tmux doesn't care about this -
* it always uses absolute only moves the cursor with a newline when
* also sending a linefeed.
*
* This is irritating, most notably because it is painful to write to
* the very bottom-right of the screen without scrolling.
*
* Flag the terminal here and apply some workarounds in other places to
* do the best possible.
*/
if (!tty_term_flag(term, TTYC_XENL))
term->flags |= TERM_NOXENL;
if (!tty_term_flag(term, TTYC_AM))
term->flags |= TERM_NOAM;
/* Generate ACS table. If none is present, use nearest ASCII. */
memset(term->acs, 0, sizeof term->acs);