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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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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