Read metadata to update project information

runtime/build.rs

@@ -2,6 +2,54 @@ use std::path::PathBuf;
 
 fn main() {
     tauri_build::build();
+    
+    // Tells Cargo to re-run this script only, when the version.txt file was changed:
+    println!("cargo:rerun-if-changed=../metadata.txt");
+    
     let out_dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
     println!("cargo:rustc-env=OUT_DIR={}", out_dir.to_str().unwrap());
+
+    let metadata = include_str!("../metadata.txt");
+    let mut metadata_lines = metadata.lines();
+    let version = metadata_lines.next().unwrap();
+    
+    update_cargo_toml("Cargo.toml", version);
+    update_tauri_conf("tauri.conf.json", version);
+}
+
+fn update_cargo_toml(cargo_path: &str, version: &str) {
+    let cargo_toml = std::fs::read_to_string(cargo_path).unwrap();
+    let cargo_toml_lines = cargo_toml.lines();
+    let mut new_cargo_toml = String::new();
+
+    for line in cargo_toml_lines {
+        if line.starts_with("version = ") {
+            new_cargo_toml.push_str(&format!("version = \"{version}\""));
+        } else {
+            new_cargo_toml.push_str(line);
+        }
+        new_cargo_toml.push('\n');
+    }
+
+    std::fs::write(cargo_path, new_cargo_toml).unwrap();
+}
+
+fn update_tauri_conf(tauri_conf_path: &str, version: &str) {
+    let tauri_conf = std::fs::read_to_string(tauri_conf_path).unwrap();
+    let tauri_conf_lines = tauri_conf.lines();
+    let mut new_tauri_conf = String::new();
+
+    for line in tauri_conf_lines {
+        // The version in Tauri's config is formatted like this:
+        //  "version": "0.1.0-alpha.0"
+        // Please notice, that the version number line might have a leading tab, etc.
+        if line.contains("\"version\": ") {
+            new_tauri_conf.push_str(&format!("\t\"version\": \"{version}\""));
+        } else {
+            new_tauri_conf.push_str(line);
+        }
+        new_tauri_conf.push('\n');
+    }
+
+    std::fs::write(tauri_conf_path, new_tauri_conf).unwrap();
 }