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annotate src/main.rs @ 1:1a362692ed76 default tip

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Add native support for stdin/stdout.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 11 Jan 2022 16:25:21 +0100
parents 9b4be43ea74f
children
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1 use image::{imageops::FilterType, GenericImageView};
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2 use log::info;
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3 use std::env;
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4 use std::error::Error;
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5 use std::fs::File;
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6 use std::io::{self, BufReader, Read};
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7 use std::path::Path;
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8 use std::str::FromStr;
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9
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10 fn main() -> Result<(), Box<dyn Error>> {
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11 let args: Vec<_> = env::args().collect();
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12 if args.len() != 4 {
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13 eprintln!("Usage: {} <size> <input> <output>", args[0]);
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14 std::process::exit(1);
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15 }
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16
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17 let size = u32::from_str(&args[1])?;
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18
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19 let mut input = Vec::new();
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20 if args[2] == "-" {
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21 io::stdin().read_to_end(&mut input)?;
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22 } else {
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23 let file = File::open(&args[2])?;
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24 let mut reader = BufReader::new(file);
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25 reader.read_to_end(&mut input)?;
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26 }
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27
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28 let output = if args[3] == "-" {
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29 Path::new("/dev/stdout")
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30 } else {
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31 Path::new(&args[3])
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32 };
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33
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34 // Guess the format of the input file.
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35 let format = image::guess_format(&input)?;
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36
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37 // Decode the image file.
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38 let image = image::load_from_memory(&input)?;
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39
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40 let (mut width, mut height) = image.dimensions();
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41 if width > size {
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42 width = size;
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43 }
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44 if height > size {
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45 height = size;
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46 }
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47
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48 // Resize it to the requested size.
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49 let image = image.resize(width, height, FilterType::Triangle);
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50
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51 // Then save it to the output.
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52 image.save_with_format(output, format)?;
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53
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54 info!("Successfully resized!");
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55 Ok(())
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56 }