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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
}
# print the parsed values from the config file in key:value format
#
parse () {
local file="$1"
local level=""
local list=""
while IFS= read -r line; do
line=$(sed "s/\s\+/ /g" <<< "$line" | sed "s/^\s\|\s$\|;*$//g")
grep -q "^#" <<< "$line" && continue
grep -q "." <<< "$line" || continue
local key=$(echo $line | cut -d" " -f1)
local value=$(echo $line | cut -d" " -f2-)
[ "$key" = "include" ] && parse $value && continue
case ${value: -1} in
"{")
level="$level$key."
;;
"[")
list="$list$key."
printf "$level$key:"
;;
"}")
level=$(sed "s/[^\.]\w*\.$//g" <<< "$level")
;;
"]")
printf "\n"
list=$(sed "s/[^\.]\w*\.$//g" <<< "$list")
;;
*)
grep -q "." <<< "$list" &&
printf "$line " ||
printf "$level$key:$value\n"
;;
esac
done < "$file"
}
# Filter the parsed file for specific keys
#
filter () {
local pattern=
[ $# = 0 ] &&
pattern=".*" ||
pattern=$(sed "s/\*/.*/g"<<< "$@")
$print_keys &&
pattern="s/^($pattern:.+)/\1/p" ||
pattern="s/^$pattern:(.+)/\1/p"
parse $CONF_FILE | sed -rn $pattern
}
# 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}"
;;
*)
esac
done
shift $((OPTIND-1))
[ -z ${count} ] &&
filter "$@" ||
filter "$@" | tail -n $count
|
