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prezto/modules/prompt/README.md

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Prompt
======
Loads prompt [themes][1].
Settings
--------
To select a prompt theme, add the following to *zpreztorc*, and replace **name**
with the name of the theme you wish to load. Setting it to **random** will load
a random theme.
zstyle ':prezto:module:prompt' theme 'name'
Theming
-------
A prompt theme is an autoloadable function file with a special name,
`prompt_name_setup`, placed anywhere in `$fpath`, but for the purpose of this
project, themes **should** be placed in the *modules/prompt/functions*
directory.
### Theme Functions
There are three theme functions, a setup function, a help function, and
a preview function. The setup function **must** always be defined. The help
function and the preview functions are optional.
#### prompt_name_setup
This function is called by the `prompt` function to install the theme. This
function may define other functions as necessary to maintain the prompt,
including a function that displays help or a function used to preview it.
**Do not call this function directly.**
The most basic example of this function can be seen below.
prompt_name_setup() {
PROMPT='%m%# '
RPROMPT=''
}
#### prompt_name_help
If the `prompt_name_setup` function is customizable via parameters, a help
function **should** be defined. The user will access it via `prompt -h name`.
The most basic example of this function can be seen below.
prompt_name_help() {
cat <<EOH
This prompt is color-scheme-able. You can invoke it thus:
prompt theme [<color1>] [<color2>]
where the color is for the left-hand prompt.
EOH
}
#### prompt_name_preview
If the `prompt_name_setup` function is customizable via parameters, a preview
function **should** be defined. The user will access it via `prompt -p name`.
The most basic example of this function can be seen below.
prompt_name_preview() {
if (( $# > 0 )); then
prompt_preview_theme theme "$@"
else
prompt_preview_theme theme red green blue
print
prompt_preview_theme theme yellow magenta black
fi
}
### Hook Functions
There are many Zsh [hook][2] functions, but mostly the *precmd* hook will be
used.
#### prompt_name_precmd
This hook is called before the prompt is displayed and is useful for getting
information to display in a prompt.
When calling functions to get information to display in a prompt, do not assume
that all the dependencies have been loaded. Always check for the availability of
a function before you calling it.
**Do not register hook functions. They will be registered by the `prompt` function.**
The most basic example of this function can be seen below.
prompt_name_precmd() {
if (( $+functions[git-info] )); then
git-info
fi
}
Authors
-------
*The authors of this module should be contacted via the [issue tracker][3].*
- [Sorin Ionescu](https://github.com/sorin-ionescu)
[1]: http://zsh.sourceforge.net/Doc/Release/User-Contributions.html#Prompt-Themes
[2]: http://zsh.sourceforge.net/Doc/Release/Functions.html#Hook-Functions
[3]: https://github.com/sorin-ionescu/prezto/issues