# Copyright (C) 2021 Wojtek Kosior
# Redistribution terms are gathered in the `copyright' file.

# This file is meant to be sourced in sh.

ENDL="
"

# A "raw" echo, interprets neither backclash escapes nor command-line options.
# Does not emit trailing newline.
ech() {
    printf %s "$*"
}

errcho() {
    echo "$@" >&2
}

map_set_instr() {
    echo "$1__$2='$3'"
}

map_set() {
    eval "$(map_set_instr "$@")"
}

map_set_export() {
    eval "export $(map_set_instr "$@")"
}

map_get() {
    eval "echo \"\$$1__$2\""
}

map_del_instr() {
    echo "unset $1__$2"
}

map_del() {
    eval "$(map_del_instr "$@")"
}

sanitize() {
    echo "$1" | tr /.- _
}

escape_regex_special() {
    ech "$1" | sed 's/\([]\.*?{},()[-]\)/\\\1/g'
}

# Note: We don't actually parse JSON. We extract needed keys with sed regexes
# which does not work in the general case but is sufficient for now.
get_json_key() {
    local KEY_REG="$(escape_regex_special "$1")"
    ech "$2" |
	sed 's/\(.*"'"$KEY_REG"'"[[:space:]]*:[[:space:]]*"\([^"]*\)"\)\?.*/\2/' |
	grep . | head -1
}