prompt-hooks.org

Prompt hook manipulation library for Elvish

Convenience functions to add hooks to the prompt hook lists.

Table of Contents

• Usage
• Implementation

Usage

Install the elvish-modules package using epm:

use epm
epm:install github.com/zzamboni/elvish-modules

In your rc.elv, load this module:

use github.com/zzamboni/elvish-modules/prompt-hooks

$edit:before-readline hooks are executed before right after the prompt is shown. $edit:after-readline hooks are executed after the user presses Enter, before the command is executed. The typed command is passed as argument to after-readline hooks.

Use like this:

prompt-hooks:add-before-readline { code to execute } ...
prompt-hooks:add-after-readline { code to execute } ...

Multiple hooks can be added, they execute in sequence.

Implementation

Each function adds the given hooks to the corresponding variable, if it’s not there already.

fn add-before-readline {|@hooks|
  each {|hook|
    if (not (has-value $edit:before-readline $hook)) {
      set edit:before-readline = [ $@edit:before-readline $hook ]
    }
  } $hooks
}

fn add-after-readline {|@hooks|
  each {|hook|
    if (not (has-value $edit:after-readline $hook)) {
      set edit:after-readline = [ $@edit:after-readline $hook ]
    }
  } $hooks
}