Awk script to extract file statistic from a har file

file_stats_from_har.awk

function FileStats(file) {
    nb_js  = 0
    nb_img = 0
    nb_css = 0
    nb_others = 0 # also html/text
    nb_lines = 0
    cmd = sprintf("%s %s", "jq '(.log.entries[]|[ .request.url])|@csv'", file)
    while (cmd|getline) {
        if (/\.png|\.jpg|\.gif/) {
            nb_img++
        } else if (/\.css/) {
            nb_css++
        } else if (/\.js/) {
            nb_js++
        } else {
            nb_others++
        }
        nb_lines++
    }
    printf("img : %.2f%%\n", (nb_img/nb_lines)*100)

    printf("js  : %.2f%%\n", (nb_js/nb_lines)*100)

    printf("css : %.2f%%\n", (nb_css/nb_lines)*100)

    printf("others : %.2f%%\n", (nb_others/nb_lines)*100)
}

BEGIN {
    if (ARGC < 2 || ARGC > 2)
        print "Please specify the csv file"
    else
        FileStats(ARGV[1])
}