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Expose --histreedit and --histverify options (re: 921bbcae)

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This adds two long-form shell options that modify history expansion
(-H/--histexpand). If --histreedit is on and a history expansion
fails, the command line is reloaded into the next prompt's edit
buffer, allowing corrections. If --histverify is on, the results of
a history expansion are not immediately executed but instead loaded
into the next prompt's edit buffer, allowing further changes.

SH_HISTREEDIT and SH_HISTVERIFY were already handled all along in
slowread() in io.c and via 'reedit' arguments to functions called
there, but could not be turned on as they were only ever exposed as
shopt options in the removed bash compatibility mode (in theory
only, as it failed to compile). I had overlooked them until now.

So, since the code is there, let's expose these options through the
normal long options interface. They're working fine, and activating
them actually makes history expansion tolerable to use.

src/cmd/ksh93/data/options.c:
- Make these options available as "histreedit" and "histverify".

src/cmd/ksh93/data/builtins.c,
src/cmd/ksh93/sh.1:
- Document the "new" options.

src/cmd/ksh93/include/defs.h:
- Remove unused SH_HISTAPPEND and SH_HISTORY2 macros which were
  part of the removed bash compatibility code. Note that ksh does
  not need a histappend option as it never overwrites the history
  file (in the bash mode, this shopt option was a no-op).
This commit is contained in:
Martijn Dekker 2022-01-12 14:55:02 +00:00
parent 2d4a787564
commit a5700d3937
8 changed files with 47 additions and 11 deletions
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@ -1,8 +1,13 @@
This documents significant changes in the 93u+m branch of AT&T ksh93.
For full details, see the git log at: https://github.com/ksh93/ksh
This documents significant changes in the 1.0 branch of ksh 93u+m.
For full details, see the git log at: https://github.com/ksh93/ksh/tree/1.0
Any uppercase BUG_* names are modernish shell bug IDs.
2022-01-12:
- Added bash-inspired --histreedit and --histverify options that modify history
expansion (--histexpand), allowing editing on failure or before execution.
2022-01-04:
- Fixed an issue in vi mode that caused tab completion to fail if the