v0.0.2

build.rs

@@ -1,35 +1,31 @@
-use std::{env, fs, path::PathBuf};
+use std::{
+    env, fs,
+    path::{Path, PathBuf},
+};
 
-fn main() {
-    let root = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR"));
-    let out = PathBuf::from(env::var_os("OUT_DIR").expect("OUT_DIR"));
-    let css_dir = root.join("src/web/css");
-    let manifest = css_dir.join("manifest.txt");
+fn fnv1a64(parts: &[&[u8]]) -> u64 {
+    let mut hash = 0xcbf29ce484222325u64;
+    for part in parts {
+        for byte in *part {
+            hash ^= u64::from(*byte);
+            hash = hash.wrapping_mul(0x100000001b3);
+        }
+    }
+    hash
+}
 
+fn bundle_manifest(
+    root: &Path,
+    directory: &Path,
+    manifest: &Path,
+    extension: &str,
+    banner: &str,
+) -> String {
     println!("cargo:rerun-if-changed={}", manifest.display());
-    println!(
-        "cargo:rerun-if-changed={}",
-        root.join("src/web/index.html").display()
-    );
-    println!(
-        "cargo:rerun-if-changed={}",
-        root.join("src/web/app.js").display()
-    );
-    println!(
-        "cargo:rerun-if-changed={}",
-        root.join("src/web/icons.svg").display()
-    );
-    println!(
-        "cargo:rerun-if-changed={}",
-        root.join("src/web/i18n/en.json").display()
-    );
-    println!(
-        "cargo:rerun-if-changed={}",
-        root.join("src/web/i18n/pl.json").display()
-    );
-
-    let manifest_text = fs::read_to_string(&manifest).expect("read src/web/css/manifest.txt");
-    let mut bundle = String::from("/* RustBox UI bundle - generated by build.rs */\n");
+    let manifest_text = fs::read_to_string(manifest)
+        .unwrap_or_else(|error| panic!("{}: {error}", manifest.display()));
+    let mut bundle = String::from(banner);
+    bundle.push('\n');
 
     for raw in manifest_text.lines() {
         let name = raw.trim();
@@ -37,22 +33,66 @@ fn main() {
             continue;
         }
         assert!(
-            name.ends_with(".css")
+            name.ends_with(extension)
                 && !name.contains('/')
                 && !name.contains('\\')
                 && !name.contains(".."),
-            "invalid CSS manifest entry: {name}"
+            "invalid {extension} manifest entry: {name}"
+        );
+        let path = directory.join(name);
+        assert!(
+            path.starts_with(root),
+            "asset path escaped project root: {}",
+            path.display()
         );
-        let path = css_dir.join(name);
         println!("cargo:rerun-if-changed={}", path.display());
-        let css =
+        let source =
             fs::read_to_string(&path).unwrap_or_else(|error| panic!("{}: {error}", path.display()));
-        bundle.push_str("\n/* ");
+        bundle.push_str("\n/* ---- ");
         bundle.push_str(name);
-        bundle.push_str(" */\n");
-        bundle.push_str(&css);
-        bundle.push('\n');
+        bundle.push_str(" ---- */\n");
+        bundle.push_str(&source);
+        if !source.ends_with('\n') {
+            bundle.push('\n');
+        }
     }
 
-    fs::write(out.join("rustbox-ui.css"), bundle).expect("write RustBox CSS bundle");
+    bundle
+}
+
+fn main() {
+    let root = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR"));
+    let out = PathBuf::from(env::var_os("OUT_DIR").expect("OUT_DIR"));
+    let css_dir = root.join("src/web/css");
+    let js_dir = root.join("src/web/js");
+
+    for path in [
+        root.join("src/web/index.html"),
+        root.join("src/web/icons.svg"),
+        root.join("src/web/i18n/en.json"),
+        root.join("src/web/i18n/pl.json"),
+    ] {
+        println!("cargo:rerun-if-changed={}", path.display());
+    }
+
+    let css_bundle = bundle_manifest(
+        &root,
+        &css_dir,
+        &css_dir.join("manifest.txt"),
+        ".css",
+        "/* RustBox UI CSS bundle - generated by build.rs */",
+    );
+    let js_bundle = bundle_manifest(
+        &root,
+        &js_dir,
+        &js_dir.join("manifest.txt"),
+        ".js",
+        "/* RustBox UI JavaScript bundle - generated by build.rs; edit src/web/js/*.js */",
+    );
+
+    let asset_id = fnv1a64(&[css_bundle.as_bytes(), js_bundle.as_bytes()]);
+    println!("cargo:rustc-env=RUSTBOX_ASSET_ID={asset_id:016x}");
+
+    fs::write(out.join("rustbox-ui.css"), css_bundle).expect("write RustBox CSS bundle");
+    fs::write(out.join("rustbox-ui.js"), js_bundle).expect("write RustBox JavaScript bundle");
 }