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Add support for more keyboard shortcuts (#410)

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Add extra key bindings to the emacs and vi modes

This patch adds the following key bindings to the emacs and vi
editing modes:
- Support for Home key sequences ^[[1~ and ^[[7~ as well as End key
  sequences ^[[4~ and ^[[8~.
- Support for arrow key sequences ^[OA, ^[OB, ^[OC and ^[OD.
- Support for the following keyboard shortcuts (if the platform
  supports the expected escape sequence):
  - Ctrl-Left Arrow:  Go back one word
  - Alt-Left Arrow:   Go back one word     (Not supported on Haiku)
  - Ctrl-Right Arrow: Go forward one word
  - Alt-Right Arrow:  Go forward one word  (Not supported on Haiku)
  - Ctrl-G:           Cancel reverse search
  - Ctrl-Delete:      Delete next word     (Not supported on Haiku)
- Added a key binding for the Insert key, which differs in the
  emacs and vi editing modes:
  - In emacs mode, Insert escapes the next character.
  - In vi mode, Insert will switch the editor to insert mode (like
    in vim).

src/cmd/ksh93/edit/{emacs,vi}.c:
- Add support for the <M-Left> and <M-Right> sequences. Like in
  bash and mksh, these shortcuts move the cursor one word backward
  or forward (like the <Ctrl-Left> and <Ctrl-Right> shortcuts).
- Only attempt to process these shortcuts if the escape sequence
  begins with $'\E[1;'.

src/cmd/ksh93/edit/vi.c:
- If the shell isn't doing a reverse search, insert the bell
  character when Ctrl+G is input.
- Add the Ctrl-Delete shortcut as an alias of 'dw'. Calling
  ed_ungetchar twice does not work for 'dw', so Ctrl-Delete was
  implemented by using a vp->del_word variable.

Co-authored-by: Martijn Dekker <martijn@inlv.org>
This commit is contained in:
Johnothan King 2022-01-31 13:09:50 -08:00 • committed by Martijn Dekker
parent 9c313c7fe3
commit 9a5af738ef
6 changed files with 334 additions and 8 deletions
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2
src/cmd/ksh93/include/version.h
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@ -21,7 +21,7 @@
#define SH_RELEASE_FORK "93u+m" /* only change if you develop a new ksh93 fork */
#define SH_RELEASE_SVER "1.0.0-beta.2" /* semantic version number: https://semver.org */
#define SH_RELEASE_DATE "2022-01-28" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2022-01-31" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_CPYR "(c) 2020-2022 Contributors to ksh " SH_RELEASE_FORK
/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */