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keymap: align backspace escapes with XTerm

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Backspace now emits DEL for all non-ctrl modifier combos, and BS for
all ctrl modifier combos.

The alt modifier prefixes DEL/BS with ESC.

This also removes my own hack of mapping ctrl+backspace to
alt+backspace.

Describe backspace behavior in both the README and the man page.

TODO: implement DECBKM to allow applications to toggle the backspace
behavior.
This commit is contained in:
Daniel Eklöf 2020-02-21 19:11:03 +01:00
parent 54fbfb6405
commit ae23023341
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GPG key ID: 5BBD4992C116573F
3 changed files with 44 additions and 3 deletions
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17
README.md
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@ -15,6 +15,7 @@
1. [Mouse](#mouse)
1. [Server (daemon) mode](#server-daemon-mode)
1. [Alt/meta](#alt-meta)
1. [Backspace](#backspace)
1. [DPI and font size](#dpi-and-font-size)
1. [Requirements](#requirements)
1. [Running](#running)
@ -220,6 +221,22 @@ mode_, `\E[?1034l`), and enabled again with `smm` (_set meta mode_,
'\E[?1034h`).
## Backspace
Foot transmits DEL (`^?`) on <kbd>backspace</kbd>. This corresponds to
XTerm's `backarrowKey` option set to `false`, and to DECBKM being
_reset_.
To instead transmit BS (`^H`), press
<kbd>ctrl</kbd>+<kbd>backspace</kbd>.
Note that foot does **not** implement DECBKM, and that the behavior
described above **cannot** be changed.
Finally, pressing <kbd>alt</kbd> will prefix the transmitted byte with
ESC.
## DPI and font size
Font sizes are apparently a complex thing. Many applications use a

11
doc/foot.1.scd
View file

@ -199,6 +199,17 @@ This can also be disabled programatically with *rmm* (Reset Meta Mode,
*\E[?1034l*), and enabled again with *smm* (Set Meta Mode,
*\E[?1034h*).
# BACKSPACE
Foot transmits DEL (*^?*) on backspace. This corresponds to XTerm's
*backarrowKey* option set to *false*, and to DECBKM being _reset_.
To instead transmit BS (*^H*), press *ctrl*+*backspace*.
Note that foot does *not* implement DECBKM, and that the behavior
described above *cannot* be changed.
Finally, pressing *alt* will prefix the transmitted byte with ESC.
# CONFIGURATION

19
keymap.h
View file

@ -38,9 +38,22 @@ static const struct key_data key_backtab[] = {
};
static const struct key_data key_backspace[] = {
{MOD_ALT, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\033\x7f"},
{MOD_CTRL, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\033\x7f"},
{MOD_ANY, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\x7f"},
{MOD_SHIFT, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\x7f"},
{MOD_ALT, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\033\x7f"},
{MOD_SHIFT | MOD_ALT, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\033\x7f"},
{MOD_CTRL, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\x08"},
{MOD_SHIFT | MOD_CTRL, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\x08"},
{MOD_ALT | MOD_CTRL, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\033\x08"},
{MOD_SHIFT | MOD_ALT | MOD_CTRL, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\033\x08"},
{MOD_META, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\x7f"},
{MOD_META | MOD_SHIFT, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\x7f"},
{MOD_META | MOD_ALT, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\033\x7f"},
{MOD_META | MOD_SHIFT | MOD_ALT, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\033\x7f"},
{MOD_META | MOD_CTRL, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\x08"},
{MOD_META | MOD_SHIFT | MOD_CTRL, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\x08"},
{MOD_META | MOD_ALT | MOD_CTRL, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\033\x08"},
{MOD_META | MOD_SHIFT | MOD_ALT | MOD_CTRL, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\033\x08"},
{MOD_ANY, CURSOR_KEYS_DONTCARE, KEYPAD_DONTCARE, "\x7f"},
};
#define DEFAULT_MODS_FOR_SINGLE(sym) \