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csi: add new private mode that makes the Escape key emit "\E[27;1;27~"

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This mode can be set by client programs with the DECSET, DECRST,
XTSAVE and XTRESTORE sequences by using 27127 as the parameter.

The sequence "\E[27;1;27~" is encoded in the same way as is done by
xterm's "modifyOtherKeys" mode. Even though xterm itself never emits
such a sequence for the Escape key, many programs already have
support for parsing this style of key sequence.
This commit is contained in:
Craig Barnes 2020-11-29 04:04:57 +00:00
parent c213ee90f1
commit 31c73f0cf0
4 changed files with 16 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

6
csi.c
View file

@ -536,6 +536,10 @@ decset_decrst(struct terminal *term, unsigned param, bool enable)
term->bracketed_paste = enable;
break;
case 27127:
term->modify_escape_key = enable;
break;
default:
UNHANDLED();
break;
@ -583,6 +587,7 @@ xtsave(struct terminal *term, unsigned param)
case 1042: term->xtsave.bell_is_urgent = term->bell_is_urgent; break;
case 1049: term->xtsave.alt_screen = term->grid == &term->alt; break;
case 2004: term->xtsave.bracketed_paste = term->bracketed_paste; break;
case 27127: term->xtsave.modify_escape_key = term->modify_escape_key; break;
}
}
@ -616,6 +621,7 @@ xtrestore(struct terminal *term, unsigned param)
case 1042: enable = term->xtsave.bell_is_urgent; break;
case 1049: enable = term->xtsave.alt_screen; break;
case 2004: enable = term->xtsave.bracketed_paste; break;
case 27127: enable = term->xtsave.modify_escape_key; break;
default: return;
}

8
input.c
View file

@ -891,7 +891,13 @@ key_press_release(struct seat *seat, struct terminal *term, uint32_t serial,
keymap_mods |= seat->kbd.ctrl ? MOD_CTRL : MOD_NONE;
keymap_mods |= seat->kbd.meta ? MOD_META : MOD_NONE;
const struct key_data *keymap = keymap_lookup(seat, term, sym, keymap_mods);
const struct key_data *keymap;
if (sym == XKB_KEY_Escape && keymap_mods == MOD_NONE && term->modify_escape_key) {
static const struct key_data esc = {.seq = "\033[27;1;27~"};
keymap = &esc;
} else
keymap = keymap_lookup(seat, term, sym, keymap_mods);
if (keymap != NULL) {
term_to_slave(term, keymap->seq, strlen(keymap->seq));

1
terminal.c
View file

@ -1523,6 +1523,7 @@ term_reset(struct terminal *term, bool hard)
term->insert_mode = false;
term->bracketed_paste = false;
term->focus_events = false;
term->modify_escape_key = false;
term->mouse_tracking = MOUSE_NONE;
term->mouse_reporting = MOUSE_NORMAL;
term->charsets.selected = 0;

2
terminal.h
View file

@ -236,6 +236,7 @@ struct terminal {
bool bracketed_paste;
bool focus_events;
bool alt_scrolling;
bool modify_escape_key;
enum cursor_origin origin;
enum cursor_keys cursor_keys_mode;
enum keypad_keys keypad_keys_mode;
@ -296,6 +297,7 @@ struct terminal {
uint32_t num_lock_modifier:1;
uint32_t bell_is_urgent:1;
uint32_t alt_screen:1;
uint32_t modify_escape_key:1;
} xtsave;
char *window_title;