enum-nixos-options.awk

#!/run/current-system/sw/bin/gawk -f

function enumerate(option,     cmd, value, o) {
        cmd = "nixos-option " option " 2>/dev/null"
        #print cmd
        value = ""
        while(cmd | getline && (value == "")) {
                if($0 == "Value:") {
                        cmd | getline value
                        print option " = " substr(value, 1, 50)
                } else {
                        o = option "." $1
                        #print o
                        enumerate(o)
                }
        }
        close(cmd)
}

BEGIN {
        while("nixos-option 2>/dev/null" | getline) {
                option = $1
                #print option
                enumerate(option)
        }
}