shell_utils.sh


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

# This file is meant to be sourced in sh.

map_set_instr() {
    printf "%s__%s='%s'" "$1" "$2" "$3"
}

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

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

map_get() {
    eval "printf %s \"\$$1__$2\""
}

map_del_instr() {
    printf 'unset %s__%s' "$1" "$2"
}

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

sanitize() {
    printf %s "$1" | tr /.- _
}

escape_regex_special() {
    printf %s "$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")"
    printf %s "$2" |
	sed 's/\(.*"'"$KEY_REG"'"[[:space:]]*:[[:space:]]*"\([^"]*\)"\)\?.*/\2/' |
	grep . | head -1
}