* archive: fix unrar check when using unrar-free
unrar-free returns the error code 1 when run without arguments, thus
failing the presence check. Replacing the current presence check with
(( $+commands[unrar] )) fixes the problem.
* archive: add unar support for lsarchive and unarchive
No `archive` support with unar.
* Add zsh-help function for easily searching the zsh documentation
Looks up things in the zsh documentation.
Usage: zsh-help [--all] search term(s)
Option --all will seach for the term anywhere, not just at the start of a
line. When not using --all it will search nicely for terms at the beginning
of the line, which in the zsh man pages is where terms that are explained
are located, allowing you to search the zsh man pages easily.
* Improve zsh-help to search section headings before other text
Provides a much easier way to search and access ZSH's manual. First checks for
terms at the start of the manual, then checks if it's at start of a line allowing
whitespace.
Clean up some of the code a bit and format it to have a proper header for the
zprezto project with author/email and description of the function.
Now that pyenv plugins availability is detected by directly probing
'pyenv', we need to rely on the same mechanism consistently.
Further, we perform available pyenv plugin scan with native zsh
techniques instead of relying on external commands.
If the pyenv virtualenv plugin is installed using the [pyenv-installer][1]
app script or directly via a [Git clone][2], then the pyenv-virtualenv-init
executable, that the `pyenv virtualenv-init` command uses, will not
exist in the user's PATH and therefore cannot be found using
`$commands[pyenv-virtualenv-init]`.
Installing the pyenv-virtualenv plugin in this manner is common among Linux users.
Using the pyenv `commands` command, which lists all commands pyenv can
run, we can find if the virtualenv-init command is available to pyenv
and subsequently the virtualenv plugin, without relying on
pyenv-virtualenv-init to exist in the user's PATH.
[1]: https://github.com/pyenv/pyenv-installer
[2]: https://github.com/pyenv/pyenv-virtualenv#installing-as-a-pyenv-plugin
Kaleb Elwert