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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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9
ANNOUNCE
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@ -56,6 +56,15 @@ New features in built-in commands:
Note that to use these options the operating system must support the
corresponding resource limit.
New command line editor features:
- Various keys on extended PC keyboards are now handled as expected in the
emacs and vi built-in line editors: Ctrl or Alt + left or right arrow (go
back or forward one word), Ctrl+G (cancel reverse search), Ctrl+Delete
(delete next word). In addition, the Insert key now escapes the next
character in emacs and enters insert mode in vi, and the arrow keys are
recognized on more terminals.
New features in shell options:
- The new --histreedit and --histverify options modify history expansion