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#!/bin/bash
usage () {
printf "Usage $0 "
echo << "EOF"
OPTIONS... [FILTER]
Print the parsed config file filtering by the keys
Arguments:
-f file read configuration from a file, uses /dev/sdtin otherwise
-v only print values
-c n print the last [n]
EOF
}
getlevel() {
for i in $*; do
printf $i
printf '.'
done
}
parse_line() {
[ $# == "0" ] && return
local line="$@"
local key=$1
shift
local value="$@"
[ "$key" = "include" ] && cat $value | parse && return
[ "$key" = "]" ] && unset list[-1] && printf "\n" && return
[ "$key" = "}" ] && unset level[-1] && return
case ${value: -1} in
"{")
level+=("$key")
;;
"[")
list+=("$key")
printf "$(getlevel ${level[@]})$key:"
;;
*)
[ "${#list[@]}" == "0" ] &&
printf "$(getlevel ${level[@]})$key:$value\n" ||
printf "$line "
;;
esac
}
# print the parsed values from the config file in key:value format
#
parse () {
local file="$1"
export level=()
export list=()
while IFS= read -r line; do
# strip whitespace
parse_line $line
done < "/dev/stdin"
}
# Use the env variable if exists
[ -z ${CONF_FILE} ] && CONF_FILE="/dev/stdin"
# initialise options
print_keys=true
count=
while getopts ":f:c:v" opt; do
case "${opt}" in
f)
[ "${OPTARG}" = "-" ] &&
CONF_FILE="/dev/stdin" ||
CONF_FILE="${OPTARG}"
;;
v)
print_keys=false
;;
c)
count="${OPTARG}q"
;;
*)
esac
done
shift $((OPTIND-1))
[ $# = 0 ] &&
pattern=".*" ||
pattern=$(sed "s/\*/[^:]*/g" <<< "$@")
$print_keys &&
pattern="s/^($pattern:.+)/\1/p;${count}" ||
pattern="s/^$pattern:(.+)/\1/p;${count}"
sed "s/^#.*$\|\s(\s\+)\|^\s\|\s^\|;*$//g" $CONF_FILE | parse $@ | sed -rn $pattern
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