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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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3 changed files with 44 additions and 3 deletions
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@ -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