simple-grep.rn

import argparser

fun main() {
    var parser = argparser.Argparser()
    parser.add_flag("--help", "-h", "Show this help text and exit")
    parser.add_pos_opt("query", "String to query", required=true)
    parser.add_pos_opt("file", "File to query string in", required=true)
    parser.add_flag("--line-numbers", "-n", "Show line numbers")
    parser.add_named("--max-lines", "Maximum amount of lines to show", conversor=int)
    var args = parser.parse(argv[:])

    if args["--help"] {
        print(parser.usage(argv[0]))
        exit()
    }

    var f = File(args["file"], "r")
    var lines = (String(f.read())).split("\n")
    f.close()

    var matched_lines = []
    var i = 0
    for line in lines {
        if args["query"] in line {
            arr_append(matched_lines, [i, line])
        }
        i++
    }

    if not is_null(args["--max-lines"]) {
        var matched_lines = matched_lines[:args["--max-lines"]]
    }

    for line in matched_lines {
        var s = line[1]
        if args["--line-numbers"] {
            var s = args["file"] + ":" + line[0] + ": " + s
        }
        print(s)
    }
}

main()