140 lines
2.7 KiB
Bash
140 lines
2.7 KiB
Bash
#!/usr/bin/env bash
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# https://github.com/nicolas-goudry/nix-config
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# set +e # Do not exit on error
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set -e # Exit on error
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set +u # Allow unset variables
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# set -u # Exit on unset variable
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# set +o pipefail # Disable pipefail
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set -o pipefail # Enable pipefail
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script_name=$(basename "${0}")
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nc="\e[0m" # Unset styles
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bld="\e[1m" # Bold text
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dim="\e[2m" # Dim text
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red="\e[31m" # Red foreground
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green="\e[32m" # Green foreground
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yellow="\e[33m" # Yellow foreground
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blue="\e[34m" # Blue foreground
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to_stderr() {
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>&2 echo -e "${*}"
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}
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to_stdout() {
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echo -e "${*}"
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}
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error() {
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to_stderr " ${red}×${nc} ${*}"
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}
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warn() {
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to_stderr " ${yellow}⚠${nc} ${*}"
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}
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info() {
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to_stdout " ${blue}i${nc} ${*}"
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}
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debug() {
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if [ -n "${debug}" ]; then
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to_stderr " ${dim}▶ ${*}${nc}"
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fi
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}
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success() {
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to_stdout " ${green}✓${nc} ${*}"
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}
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trace() {
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to_stderr "Stacktrace:"
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local i=1 line file func
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while read -r line func file < <(caller ${i}); do
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to_stderr "[${i}] ${file}:${line} ${func}(): $(sed -n "${line}p" "${file}")"
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((i++))
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done
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}
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# shellcheck disable=SC2120
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die() {
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if [ "${#}" -gt 0 ]; then
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error "${*}"
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fi
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exit 1
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}
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needs_arg() {
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if [ -z "${OPTARG}" ]; then
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to_stderr "${0}: option requires an argument -- ${OPT}"
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usage
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die
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fi
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}
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usage() {
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to_stdout
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to_stdout "Template script."
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to_stdout
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to_stdout "${bld}Usage:${nc}"
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to_stdout " ${dim}\$${nc} ${script_name}"
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to_stdout
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to_stdout "${bld}Options:${nc}"
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cat <<EOF | column -tds '|'
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-e, --error|Exit with error
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-o, --option|Some option
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-d, --debug|Enable debug output
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-h, --help|Show this help message
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EOF
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}
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main() {
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while getopts 'hdeo:-:' OPT; do
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# support long options: https://stackoverflow.com/a/28466267/519360
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if test "$OPT" = "-"; then # long option: reformulate OPT and OPTARG
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OPT="${OPTARG%%=*}" # extract long option name
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# shellcheck disable=SC2295
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OPTARG="${OPTARG#$OPT}" # extract long option argument (may be empty)
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OPTARG="${OPTARG#=}" # if long option argument, remove assigning `=`
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fi
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# Handle flags
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case "$OPT" in
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e | error )
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die "exited with error"
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;;
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o | option )
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needs_arg
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OPTION="${OPTARG}"
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;;
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d | debug )
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debug=true
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;;
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h | help )
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usage
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exit 0
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;;
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??* ) # bad long option
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>&2 echo "${0}: illegal option -- $OPT"
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usage
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die
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;;
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? ) # bad short option (error reported via getopts)
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usage
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die
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;;
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esac
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done
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debug "Start of main"
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info "This is a template."
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if [ -n "${OPTION}" ]; then
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debug "Option is not empty"
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debug "Option is set to: ${OPTION}"
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fi
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}
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main "${@}" |