Subtitles - in Awk

 Last year, well, yesterday I wrote a simple javascript to fix the SRT file to a French movie and the result was good. I got to enjoy the movie. Then I thought I could go back to my root and rewrite it as unix shell script - awk script to be more precise. So here it is:

#!/bin/awk -f

BEGIN {

    FS=" --> ";

    RS="\r\n";

}

{

    if ($2 != "") {

        ssecond=substr($0,7,2);

        esecond=substr($0,24,2);

        if( ssecond<59) ssecond++;

        if( esecond<59) esecond++;

        printf("%s%02d%s%02d%s\n", substr($0,1,6), ssecond, substr($0,9,15), esecond, substr($0,26,4));

    }

    else

        print;

}

No surprise, the performance of the awk script is much better than Node.js.

$ time ./srt_update.awk input.srt > output.srt

real    0m0.020s
user    0m0.009s
sys     0m0.000s