Bash command completion builder

build_command_completions.sh

#!/bin/bash

#
# Build shell command completions
#

function _build_completions {
	local current_word
	COMPREPLY=()
	current_word=${COMP_WORDS[COMP_CWORD]}
  COMPREPLY=($(compgen -W "$($1)" -- $current_word))
}

function _build_completions_for_first_script {
  # './first_script display_all_my_commands' outputs all commands
  # that can be completed for ./first_script, as a space delimited list.
  _build_completions './first_script display_all_my_commands'
}

function _build_completions_for_second_script {
  _build_completions './second_script display_all_my_commands'
}

complete -o nospace -F _build_completions_for_first_script './first_script'
complete -o nospace -F _build_completions_for_second_script './second_script'