unix-shell-script-tactics-demo

#/bin/sh
set -euf

## Program Tracking

program_command="unix-shell-script-tactics"
program_version="7.0.0"
program_created="2022-10-23T15:55:59Z"
program_updated="2023-05-08T19:47:33Z"
program_license="GPL-2.0 or GPL-3.0 or contact us for more"
program_website="https://example.com/example/"
program_contact="Alice Adams (alice@example.com)"

## Source https://github.com/sixarm/unix-shell-script-kit
. "$(dirname "$(readlink -f "$0")")/unix-shell-script-kit"

## Help Function

help(){
cat << EOF

Unix shell script style guide demo

Syntax:

    unix-shell-script-tactics

Example:

    unix-shell-script-tactics --version


## Options

  * -h --help: 
      print helpful information

  * -v --verbose: 
      increase the verbose level

  * -V --version:
      print the program version number

  * --foo=<value>:
      set the foo variable to a value

## Options to print program information

  * --program-command:
      print the program command name

  * --program-version:
      print the program version number

  * --program-created:
      print the program created date

  * --program-updated:
      print the program updated date

  * --program-license:
      print the program license name

  * --program-website:
      print the program website URL

  * --program-contact:
      print the program contact information for the maintainer

## Tracking

  * Command: $program_command
  * Version: $program_version
  * Created: $program_created
  * Updated: $program_updated
  * License: $program_license
  * Website: $program_website
  * Contact: $program_contact
EOF
}

temp_home() { out $(mktemp -d -t "${1:-$(zid)}"); }; export -f temp_home;

verbose=0
while :; do
    case $1 in
        --)
            shift
            break
            ;;
        -h|--help)
            help; exit 0;
            ;;
        -v|--verbose)
            verbose=$((verbose + 1))
            ;;
        -V|--version)
            out "$program_version"; exit 0;
            ;;
        # Options that print program information variables.
        # These variables are all set at the top of the script.
        --program-command)
            out "$program_command"; exit 0;
            ;;
        --program-version)
            out "$program_version"; exit 0;
            ;;
        --program-created)
            out "$program_created"; exit 0;
            ;;
        --program-updated)
            out "$program_updated"; exit 0;
            ;;
        --program-license)
            out "$program_license"; exit 0;
            ;;
        --program-website)
            out "$program_website"; exit 0;
            ;;
        --program-contact)
            out "$program_contact"; exit 0;
            ;;
        # Catch-all that enables arbitrary options such as key=val.
        # Depending on your goals, you can use this section or not.
        --*=*)
            key="${1#--}"; key="${key%%=*}";
            val="${1#*=}";
            eval "$key"=\$val
            shift
            ;;
        # Catch-all for unexpected input that looks like an option.
        # Depending on your goals, you can use this section or not.
        -?*)
            die "The command line option is unknown: " "$1"
            ;;
        # Any other arguments are to be treated as content, or as positional
        # arguments that are parsed later, thus break out of this loop.
        *)
            break
            ;;
    esac
    shift
done