Created
September 29, 2018 00:17
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How I start all my shell scripts
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#!/usr/bin/env bash | |
# | |
# Short header explaining what the script does | |
# | |
# exit on error, error on unbound variables, disable glob expansion, fail within pipes | |
set -eufo pipefail | |
[[ -n "${DEBUG:-}" ]] && set -x | |
: "${VAR_A=default_value_a}" | |
: "${VAR_B=default_value_b}" | |
log() { | |
# Pro Tip: declare local before assignment (http://tldp.org/LDP/abs/html/localvar.html) | |
local level | |
local message | |
level="$(echo $1 | tr '[:lower:]' '[:upper:]')" ; shift | |
message=("$@") | |
# disable colorized output unless it's to a terminal | |
if [[ -t 1 ]]; then | |
local color | |
local reset | |
reset=$(echo -ne "\033[0m") | |
case $level in | |
ERR*) color=$(echo -ne "\033[91m") ;; # light red | |
WARN*) color=$(echo -ne "\033[93m") ;; # light yellow | |
OK*) color=$(echo -ne "\033[94m") ;; # light blue | |
INFO*) color=$(echo -ne "\033[97m") ;; # white | |
TASK*) color=$(echo -ne "\033[96m") ;; # light cyan | |
*) color=$(echo -ne "\033[39m") ;; # default | |
esac | |
echo "${color}[${level}]${reset} ${message}" | |
else | |
echo "[${level}] ${message}" | |
fi | |
} | |
main() { | |
log info "${FUNCNAME[0]} $@" | |
# Handle command line args and shift them out of $@ after use | |
while getopts 'a:b:' flag; do | |
case "${flag}" in | |
a) VAR_A="${OPTARG}" ;; | |
b) VAR_B="${OPTARG}" ;; | |
esac | |
done | |
shift $(($OPTIND - 1)) | |
# Print usage | |
if [[ -z "$@" ]]; then | |
echo "Usage: $0 [-a <VAR_A>] [-b <VAR_B>] <arg> [<arg> ...]" | |
exit 1 | |
fi | |
} | |
main "$@" |
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