rs-web 0.4.3

A fast, Lua-driven static site generator with encryption support
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

use anyhow::{Context, Result};
use image::{DynamicImage, GenericImageView, imageops};
use rayon::prelude::*;
use std::fs;
use std::path::Path;
use webp::{Encoder, WebPMemory};

/// Image optimization configuration
pub struct ImageConfig {
    pub quality: f32,
    pub scale_factor: f64,
}

impl Default for ImageConfig {
    fn default() -> Self {
        Self {
            quality: 85.0,
            scale_factor: 1.0,
        }
    }
}

/// Optimize all images in a directory
pub fn optimize_images<P: AsRef<Path>>(
    input_dir: P,
    output_dir: P,
    config: &ImageConfig,
) -> Result<()> {
    let input_dir = input_dir.as_ref();
    let output_dir = output_dir.as_ref();

    if !input_dir.exists() {
        return Ok(());
    }

    fs::create_dir_all(output_dir)?;

    // Find all image files
    let image_files: Vec<_> = fs::read_dir(input_dir)?
        .filter_map(|entry| entry.ok())
        .filter(|entry| {
            let path = entry.path();
            path.extension().is_some_and(|ext| {
                let ext = ext.to_string_lossy().to_lowercase();
                ext == "jpg" || ext == "jpeg" || ext == "png"
            })
        })
        .collect();

    // Process images
    image_files.par_iter().try_for_each(|entry| {
        let path = entry.path();
        optimize_image_to_dir(&path, output_dir, config)
    })?;

    Ok(())
}

/// Optimize a single image (batch version - output to directory)
fn optimize_image_to_dir(input_path: &Path, output_dir: &Path, config: &ImageConfig) -> Result<()> {
    let img = image::open(input_path)
        .with_context(|| format!("Failed to open image: {:?}", input_path))?;

    let (w, h) = img.dimensions();

    // Resize if scale factor is less than 1
    let img = if config.scale_factor < 1.0 {
        let new_w = (w as f64 * config.scale_factor) as u32;
        let new_h = (h as f64 * config.scale_factor) as u32;
        DynamicImage::ImageRgba8(imageops::resize(
            &img,
            new_w,
            new_h,
            imageops::FilterType::Triangle,
        ))
    } else {
        img
    };

    // Get the file stem for output naming
    let stem = input_path
        .file_stem()
        .and_then(|s| s.to_str())
        .unwrap_or("image");

    // Convert to WebP
    let encoder = Encoder::from_image(&img)
        .map_err(|e| anyhow::anyhow!("Failed to create WebP encoder: {}", e))?;
    let webp: WebPMemory = encoder.encode(config.quality);

    let webp_path = output_dir.join(format!("{}.webp", stem));
    fs::write(&webp_path, &*webp)
        .with_context(|| format!("Failed to write WebP: {:?}", webp_path))?;

    // Also copy original (as fallback)
    let file_name = input_path
        .file_name()
        .ok_or_else(|| anyhow::anyhow!("Invalid file path: {:?}", input_path))?;
    let original_path = output_dir.join(file_name);
    fs::copy(input_path, &original_path)
        .with_context(|| format!("Failed to copy original: {:?}", original_path))?;

    Ok(())
}

/// Optimize a single image to a specific output path (for incremental builds)
pub fn optimize_single_image(
    input_path: &Path,
    output_path: &Path,
    config: &ImageConfig,
) -> Result<()> {
    let img = image::open(input_path)
        .with_context(|| format!("Failed to open image: {:?}", input_path))?;

    let (w, h) = img.dimensions();

    // Resize if scale factor is less than 1
    let img = if config.scale_factor < 1.0 {
        let new_w = (w as f64 * config.scale_factor) as u32;
        let new_h = (h as f64 * config.scale_factor) as u32;
        DynamicImage::ImageRgba8(imageops::resize(
            &img,
            new_w,
            new_h,
            imageops::FilterType::Triangle,
        ))
    } else {
        img
    };

    // Get output directory
    let output_dir = output_path
        .parent()
        .ok_or_else(|| anyhow::anyhow!("Invalid output path: {:?}", output_path))?;

    // Get the file stem for WebP naming
    let stem = output_path
        .file_stem()
        .and_then(|s| s.to_str())
        .unwrap_or("image");

    // Convert to WebP
    let encoder = Encoder::from_image(&img)
        .map_err(|e| anyhow::anyhow!("Failed to create WebP encoder: {}", e))?;
    let webp: WebPMemory = encoder.encode(config.quality);

    let webp_path = output_dir.join(format!("{}.webp", stem));
    fs::write(&webp_path, &*webp)
        .with_context(|| format!("Failed to write WebP: {:?}", webp_path))?;

    // Also copy original (as fallback)
    fs::copy(input_path, output_path)
        .with_context(|| format!("Failed to copy original: {:?}", output_path))?;

    Ok(())
}