tamada / sibling / 31144658941

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main: 93%

Pull #46

github

feat: refer to the sibling directory without moving, by nextdir and the hook

The issue asks for the hook which sets NEXTDIR and PREVDIR on every change of
the working directory, so that the user refers to the sibling directory without
moving to it.

The hook is here, and it is not registered by default; it runs the command
twice on every change of the working directory, which costs about 4 ms in a
directory of fifty entries, and about 30 ms in a directory of ten thousand
entries. The latter is felt by the hand, and the value goes stale as soon as
another process makes a directory.

Therefore, the same information is available on demand, too, which costs
nothing until it is asked.

- nextdir and prevdir print the sibling directory, and change nothing; they fit
  in the command substitution, such as `cp report.txt "$(nextdir)"`, and
- sibling_hook_enable and sibling_hook_disable register and unregister the hook.

The five shells use their own mechanism: chpwd_functions of zsh, PROMPT_COMMAND
of bash, the PWD event of fish, $after-chdir of Elvish, and the
LocationChangedAction of PowerShell, which keeps the action of the other tools.

Closes #18

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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