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META TOPICPARENT	name="MattVliet"

Bash autocompletion

There is a good tutorial for this here

This is documented in man bash but here is a quick overview

The following table lists useful bash variables for completion

Variable	Description
COMP_CWORD	index into `${COMP_WORDS}` of the word containing the current cursor position
COMP_KEY	The key used to invoke the current completion function
COMP_LINE	The current command line
COMP_POINT	the index if the cursor position relative to the beginning of the current command
COMP_TYPE	see bash manual
COMP_WORDS	An array variable of individual words in the current command line

Example completion script for the command foo

_foo() 
{
    local cur prev opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"
    opts="--help --verbose --version"

    if [[ ${cur} == -* ]] ; then
        COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
        return 0
    fi
}
complete -F _foo foo

To use this script either source it in your bashrc file, or save it in /etc/bash_completion.d/ to have it automatically loaded.

-- MattVliet - 2011-01-18

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