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Key encoding: in legacy mode use legacy encoding for a few more combinations

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Some legacy terminal applications get confused seeing CSI u escape
codes. Since it is relatively common to press ctrl or shift and
space/enter/tab/backspace, emit the same bytes as traditional terminals
do for these common keys.
This commit is contained in:
Kovid Goyal
2021-02-21 11:14:25 +05:30
parent de100ac67c
commit 56fcbb95ab
3 changed files with 77 additions and 48 deletions
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17
docs/keyboard-protocol.rst
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@@ -415,17 +415,18 @@ mode* (the ``smkx/rmkx`` terminfo capabilities). This form is used only in
"F11", "kf11", "CSI 23 ~"
"F12", "kf12", "CSI 24 ~"
There are a few more functional keys that have special cased legacy
encodings:
There are a few more functional keys that have special cased legacy encodings.
These are present because they are commonly used and for the sake of legacy
terminal applications that get confused when seeing CSI u escape codes:
.. csv-table:: C0 controls
:header: "Key", "Encodings"
:header: "Key", "No mods", "Ctrl", "Alt", "Shift", "Ctrl + Shift", "Alt + Shift", "Ctrl + Alt"
"Enter", "Plain - 0xd, alt+Enter - 0x1b 0x1d"
"Escape", "Plain - 0x1b, alt+Esc - 0x1b 0x1b"
"Backspace", "Plain - 0x7f, alt+Backspace - 0x1b 0x7f, ctrl+Backspace - 0x08"
"Space", "Plain - 0x20, ctrl+Space - 0x0, alt+space - 0x1b 0x20"
"Tab", "Plain - 0x09, shift+Tab - CSI Z"
"Enter", "0xd", "0xd", "0x1b 0xd", "0xd", "0xd", "0x1b 0xd", "0x1b 0xd"
"Escape", "0x1b", "0x1b", "0x1b 0x1b", "0x1b", "0x1b", "0x1b 0x1b", "0x1b 0x1b"
"Backspace", "0x7f", "0x8", "0x1b 0x7f", "0x7f", "0x8", "0x1b 0x7f", "0x1b 0x8"
"Tab", "0x9", "0x9", "0x1b 0x9", "CSI Z", "CSI Z", "0x1b CSI Z", "0x1b 0x9"
"Space", "0x20", "0x0", "0x1b 0x20", "0x20", "0x0", "0x1b 0x20", "0x1b 0x0"
Note that :kbd:`Backspace` and :kbd:`ctrl+Backspace` are swapped in some
terminals, this can be detected using the ``kbs`` terminfo property that