Build option for a base url

.gitignore

@@ -3,6 +3,7 @@
 debug/
 target/
 out/
+.env
 
 # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
 # More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html

justfile

@@ -1,7 +1,12 @@
 set export
 set quiet
+set dotenv-load
 
-build:
+build publish="false":
+	#!/usr/bin/env bash
+	if [ "{{publish}}" = false ]; then
+		export BASE_URL=""
+	fi
 	mkdir -p ./out
 	rm -rf ./out/*
 	cargo run

src/main.rs

@@ -1,6 +1,11 @@
 #![allow(dead_code)]
 
-use std::{collections::HashMap, fs, path::PathBuf, sync::LazyLock};
+use std::{
+	collections::HashMap,
+	fs,
+	path::PathBuf,
+	sync::{LazyLock, OnceLock},
+};
 
 use askama::Template;
 use blake3::{Hash, Hasher};
@@ -27,6 +32,7 @@ pub const VERSION: &str = env!("CARGO_PKG_VERSION");
 pub const ASSETS_FOLDER_PATH: &str = "./public/assets";
 pub const SCRIPTS_FOLDER_PATH: &str = "./public/scripts";
 pub const STYLES_FOLDER_PATH: &str = "./public/styles";
+static BASE_URL: OnceLock<String> = OnceLock::new();
 static FILE_HASHES: LazyLock<HashMap<String, Hash>> = LazyLock::new(|| {
 	let mut map = HashMap::new();
 
@@ -106,14 +112,22 @@ fn start_module<M: RuntimeModule>() {
 	M::start_module();
 }
 
+fn base_url() -> String {
+	BASE_URL
+		.get_or_init(|| std::env::var("BASE_URL").unwrap_or("".to_string()))
+		.to_string()
+}
+
 fn find_hash(file: &str) -> String {
 	let map = &*FILE_HASHES;
+	let base_url = base_url();
+
 	let hash = map.get(&format!(".{file}"));
 	if let Some(hash) = hash {
-		return format!("{file}?hash={hash}");
+		return format!("{base_url}{file}?hash={hash}");
 	}
 
-	file.to_string()
+	format!("{base_url}{file}")
 }
 
 fn hash_files_in_dir(path: PathBuf, hasher: &mut Hasher) {