Reorganise build script into modules

build/util.rs

@@ -0,0 +1,21 @@
+#![allow(dead_code)]
+
+use std::{collections::HashMap, fs, path::Path};
+
+/// Generates a file from a template.
+pub fn render_template(
+    variables: &HashMap<&str, String>,
+    in_file: &str,
+    out_file: impl AsRef<Path>,
+) -> anyhow::Result<()> {
+    let mut content = fs::read_to_string(in_file)?;
+
+    for (variable_name, value) in variables {
+        // Replace {{variable_name}} by the value
+        let pattern = format!("{{{{{variable_name}}}}}");
+        content = content.replace(&pattern, value);
+    }
+
+    fs::write(out_file, content)?;
+    Ok(())
+}