Sync subtitles: Difference between revisions

=={{header|Rust}}==

{{libheader|chrono}}

{{libheader|lazy_static}}

{{libheader|regex}}

<syntaxhighlight lang="rust">

use chrono::{NaiveTime, TimeDelta};

use lazy_static::lazy_static;

use regex::Regex;

use std::env;

use std::fs::File;

use std::io::{self, BufRead};

use std::io::{stdout, Write};

use std::path::Path;

lazy_static! {

static ref RE: Regex =

Regex::new(r"(\d{2}:\d{2}:\d{2},\d{3})\s+-->\s+(\d{2}:\d{2}:\d{2},\d{3})").unwrap();

static ref FORMAT: String = String::from("%H:%M:%S,%3f");

}

fn main() -> Result<(), Box<dyn std::error::Error>> {

let args: Vec<String> = env::args().collect();

match args.len() {

3 => {

let path = &args[1];

let secs: i64 = args[2].parse()?;

let mut lock = stdout().lock();

for line in sync_file(path, secs)? {

writeln!(lock, "{line}").unwrap()

}

}

_ => println!("usage: subrip-sync <filename> <seconds>"),

}

Ok(())

}

fn sync_file<P>(path: P, secs: i64) -> Result<impl Iterator<Item = String>, io::Error>

where

P: AsRef<Path>,

{

let file = File::open(path)?;

let reader = io::BufReader::new(file);

Ok(sync_lines(reader.lines().flatten(), secs))

}

fn sync_lines(lines: impl Iterator<Item = String>, secs: i64) -> impl Iterator<Item = String> {

let delta = TimeDelta::new(secs, 0).unwrap();

lines.map(move |line| {

if let Some(groups) = RE.captures(&line) {

format(&groups[1], &groups[2], &delta)

} else {

line

}

})

}

fn format(start: &str, stop: &str, delta: &TimeDelta) -> String {

format!(

"{} --> {}",

(NaiveTime::parse_from_str(start, &FORMAT).unwrap() + *delta).format(&FORMAT),

(NaiveTime::parse_from_str(stop, &FORMAT).unwrap() + *delta).format(&FORMAT)

)

}

</syntaxhighlight>

{{out}}

<pre>

$ subrip-sync movie.srt 9 > movie_plus_9.srt

$ cat movie_plus_9.srt

1

00:01:40,550 --> 00:01:45,347

Four billion years ago,

the first marine life forms.

2

00:01:45,555 --> 00:01:51,019

First came the fish...then slowly

other life forms evolved.

3

00:01:51,144 --> 00:01:52,979

Therefore, our ancestors...

4

00:01:52,979 --> 00:01:54,898

...came from fish.

5

00:01:55,232 --> 00:01:56,608

Everyone, come and see this.

6

00:01:56,733 --> 00:01:59,361

Cretaceous Tyrannosaurus.

7

00:01:59,736 --> 00:02:01,488

Ferocious!

8

00:02:07,035 --> 00:02:07,869

Red,

9

00:02:08,203 --> 00:02:09,079

Pong!

10

00:02:11,540 --> 00:02:12,999

Isn't this a gecko?

11

00:02:13,416 --> 00:02:16,419

How else can I get a 15 ton T-Rex in here?

12

00:02:16,503 --> 00:02:20,048

With our advanced technology, I shrank it down.

</pre>