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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
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6
csi.c
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@ -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;
}