stapix

diff --git a/src/main.rs b/src/main.rs
@@ -1,5 +1,3 @@
-use image::io::Reader as ImageReader;
-use image::DynamicImage;
 use std::env;
 use std::fs::{self, File};
 use std::io::{self, Write};
@@ -21,14 +19,6 @@ const PAGE_TITLE: &str = "Pablo's Photo Gallery";
 const AUTHOR: &str = "Pablo";
 const LICENSE: &str = "GPLv3";
 
-/// WebP image quality
-const IMAGE_QUALITY: f32 = 50.0;
-
-/// Target height of the thumbnails, depending on wether the image is vertical
-/// or horizontal
-const HORIZONTAL_THUMB_HEIGHT: u32 = 300;
-const VERTICAL_THUMB_HEIGHT:   u32 = 800;
-
 fn main() -> io::Result<()> {
     let args: Vec<String> = env::args().collect();
 
@@ -93,8 +83,11 @@ fn render_gallery(pic_infos: Vec<PictureInfo>) -> io::Result<()> {
     }
 
     // TODO: Parallelize this
+    let mut thumb_path = PathBuf::new();
+    thumb_path.push(TARGET_PATH);
+    thumb_path.push(THUMBS_PATH);
     for pic in &pic_infos {
-        render_thumbnail(pic)?;
+        pic.render_thumbnail(&thumb_path)?;
     }
 
     render_index(&pic_infos)?;
@@ -210,73 +203,6 @@ fn render_pic_page(pic: &PictureInfo) -> io::Result<()> {
     writeln!(f, "</html>")
 }
 
-fn render_thumbnail(pic: &PictureInfo) -> io::Result<()> {
-    let mut thumb_path = PathBuf::new();
-    thumb_path.push(TARGET_PATH);
-    thumb_path.push(THUMBS_PATH);
-    thumb_path.push(pic.file_name.clone() + ".webp");
-
-    // Only try to render thumbnail in case the thumbnail file in the machine
-    // is older than the source file
-    if let (Ok(thumb_meta), Ok(img_meta)) = (fs::metadata(&thumb_path), fs::metadata(&pic.path)) {
-        if thumb_meta.modified()? > img_meta.modified()? {
-            // TODO: Report a warning to the user
-            return Ok(());
-        }
-    }
-
-    let mut thumb_file = match File::create(&thumb_path) {
-        Ok(f)    => f,
-        Err(err) => {
-            eprintln!("ERROR: Couldn't open WebP thumbnail file {thumb_path:?}: {err}");
-            exit(1);
-        }
-    };
-
-    let img_reader = match ImageReader::open(&pic.path) {
-        Ok(r)    => r,
-        Err(err) => {
-            eprintln!(
-                "ERROR: Couldn't open file {path:?} to render WebP thumbnail: {err}",
-                path = pic.file_name
-            );
-            exit(1);
-        }
-    };
-
-    let img = match img_reader.decode() {
-        Ok(img)  => img,
-        Err(err) => {
-            eprintln!(
-                "ERROR: Failed to decode image file {name:?}: {err}",
-                name = pic.file_name
-            );
-            exit(1);
-        }
-    };
-
-    let h = if img.width() > img.height() {
-        HORIZONTAL_THUMB_HEIGHT
-    } else {
-        VERTICAL_THUMB_HEIGHT
-    };
-    let w = (h * img.width()) / img.height();
-
-    // We should make sure that the image is in the RGBA8 format so that
-    // the webp crate can encode it
-    let img = DynamicImage::from(img.thumbnail(w, h).into_rgba8());
-    let mem = webp::Encoder::from_image(&img)
-        .expect("image should be in the RGBA8 format")
-        .encode(IMAGE_QUALITY);
-
-    if let Err(err) = thumb_file.write_all(&mem) {
-        eprintln!("ERROR: Couldn't write WebP thumnail to file {thumb_path:?}: {err}");
-        exit(1);
-    }
-
-    Ok(())
-}
-
 fn write_nav(f: &mut File) -> io::Result<()> {
     writeln!(f, "<header>")?;
     writeln!(f, "<nav>")?;

diff --git a/src/types.rs b/src/types.rs
@@ -1,9 +1,22 @@
+use image::io::Reader as ImageReader;
+use image::DynamicImage;
 use serde::{
     de::{Deserializer, Error, Unexpected},
     Deserialize,
 };
 use std::fmt::{self, Display};
+use std::fs::{self, File};
+use std::io::{self, Write};
 use std::path::PathBuf;
+use std::process::exit;
+
+/// WebP image quality
+const IMAGE_QUALITY: f32 = 50.0;
+
+/// Target height of the thumbnails, depending on wether the image is vertical
+/// or horizontal
+const HORIZONTAL_THUMB_HEIGHT: u32 = 300;
+const VERTICAL_THUMB_HEIGHT:   u32 = 800;
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct PictureInfo {
@@ -14,6 +27,72 @@ pub struct PictureInfo {
 
 pub struct Escaped<'a>(pub &'a str);
 
+impl PictureInfo {
+    pub fn render_thumbnail(&self, target_dir: &PathBuf) -> io::Result<()> {
+        let thumb_path = target_dir.join(self.file_name.clone() + ".webp");
+
+        // Only try to render thumbnail in case the thumbnail file in the machine
+        // is older than the source file
+        if let (Ok(thumb_meta), Ok(img_meta)) = (fs::metadata(&thumb_path), fs::metadata(&self.path)) {
+            if thumb_meta.modified()? > img_meta.modified()? {
+                // TODO: Report a warning to the user
+                return Ok(());
+            }
+        }
+
+        let mut thumb_file = match File::create(&thumb_path) {
+            Ok(f)    => f,
+            Err(err) => {
+                eprintln!("ERROR: Couldn't open WebP thumbnail file {thumb_path:?}: {err}");
+                exit(1);
+            }
+        };
+
+        let img_reader = match ImageReader::open(&self.path) {
+            Ok(r)    => r,
+            Err(err) => {
+                eprintln!(
+                    "ERROR: Couldn't open file {path:?} to render WebP thumbnail: {err}",
+                    path = self.file_name
+                );
+                exit(1);
+            }
+        };
+
+        let img = match img_reader.decode() {
+            Ok(img)  => img,
+            Err(err) => {
+                eprintln!(
+                    "ERROR: Failed to decode image file {name:?}: {err}",
+                    name = self.file_name
+                );
+                exit(1);
+            }
+        };
+
+        let h = if img.width() > img.height() {
+            HORIZONTAL_THUMB_HEIGHT
+        } else {
+            VERTICAL_THUMB_HEIGHT
+        };
+        let w = (h * img.width()) / img.height();
+
+        // We should make sure that the image is in the RGBA8 format so that
+        // the webp crate can encode it
+        let img = DynamicImage::from(img.thumbnail(w, h).into_rgba8());
+        let mem = webp::Encoder::from_image(&img)
+            .expect("image should be in the RGBA8 format")
+            .encode(IMAGE_QUALITY);
+
+        if let Err(err) = thumb_file.write_all(&mem) {
+            eprintln!("ERROR: Couldn't write WebP thumnail to file {thumb_path:?}: {err}");
+            exit(1);
+        }
+
+        Ok(())
+    }
+}
+
 impl<'de> Deserialize<'de> for PictureInfo {
     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
     where