Larger Script Organization

Source Helper

Choose a Library

Larger scripts often move reusable functions into helper files. A small selector can decide which helper library the entry script loads.

Program

Play the script to choose the helper and see the source plan.

source_helper_plan.sh 
#!/usr/bin/env bash

helper=
case "$helper" in
    math) helper_file="lib/math.sh"; function_name="add_numbers" ;;
    text) helper_file="lib/text.sh"; function_name="trim_line" ;;
esac
echo "source $helper_file -> $function_name"

#!/usr/bin/env bash

helper=
case "$helper" in
    math) helper_file="lib/math.sh"; function_name="add_numbers" ;;
    text) helper_file="lib/text.sh"; function_name="trim_line" ;;
esac
echo "source $helper_file -> $function_name"
source `source` loads shell definitions into the current script.
helper file A helper file groups related reusable functions.
entry script The entry script chooses what helpers it needs before running the main flow.