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#!/bin/sh
#
# This script does the very simple job of echoing some text. If a '-d' (or
# '--debug') flag is given, additinal "debug" output is enabled.
#
# This script demonstrates the use of a boolean flag to enable custom
# functionality in a script.
#
# Try running these:
# $ ./debug_output.sh speak
# $ ./debug_output.sh sing
# $ ./debug_output.sh --debug sing
# source shflags
. ../src/shflags
# define flags
DEFINE_boolean 'debug' false 'enable debug mode' 'd'
FLAGS_HELP=`cat <<EOF
commands:
speak: say something
sing: sing something
EOF`
debug()
{
[ ${FLAGS_debug} -eq ${FLAGS_TRUE} ] || return
echo "DEBUG: $@" >&2
}
die() {
[ $# -gt 0 ] && echo "error: $@" >&2
flags_help
exit 1
}
# parse the command-line
FLAGS "$@" || exit 1
eval set -- "${FLAGS_ARGV}"
command=$1
case ${command} in
'') die ;;
speak)
debug "I'm getting ready to say something..."
echo 'The answer to the question "What is the meaning of life?" is "42".'
;;
sing)
debug "I'm getting ready to sing something..."
echo 'I love to sing! La diddy da dum!'
;;
*) die "unrecognized command (${command})" ;;
esac
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