feat: Improve error handling (#398)

crates/tuono/src/scaffold_project.rs

@@ -36,6 +36,11 @@ struct GithubTreeResponse<T> {
     tree: Vec<T>,
 }
 
+fn exit_with_error(message: &str) -> ! {
+    eprintln!("{}", message);
+    std::process::exit(1);
+}
+
 #[derive(Deserialize, Debug)]
 struct GithubFile {
     path: String,
@@ -44,7 +49,13 @@ struct GithubFile {
 }
 
 fn create_file(path: PathBuf, content: String) -> std::io::Result<()> {
-    let mut file = File::create(path)?;
+    let mut file = File::create(&path).unwrap_or_else(|err| {
+        exit_with_error(&format!(
+            "Failed to create file {}: {}",
+            path.display(),
+            err
+        ));
+    });
     let _ = file.write_all(content.as_bytes());
 
     Ok(())
@@ -55,21 +66,23 @@ pub fn create_new_project(folder_name: Option<String>, template: Option<String>)
 
     // In case of missing select the tuono example
     let template = template.unwrap_or("tuono-app".to_string());
-
     let client = blocking::Client::builder()
         .user_agent("")
         .build()
-        .expect("Failed to build reqwest client");
+        .unwrap_or_else(|_| exit_with_error("Error: Failed to build request client"));
 
     // This string does not include the "v" version prefix
     let cli_version: &str = crate_version!();
 
-    let res_tag = client
+    let res_tag: GithubTagResponse = client
         .get(format!("{}v{}", GITHUB_TUONO_TAGS_URL, cli_version))
         .send()
-        .unwrap_or_else(|_| panic!("Failed to call the tag github API for v{cli_version}"))
-        .json::<GithubTagResponse>()
-        .expect("Failed to parse the tag response");
+        .and_then(|response| response.json::<GithubTagResponse>())
+        .unwrap_or_else(|_| {
+            exit_with_error(&format!(
+                "Error: Failed to call or parse the tag github API for v{cli_version}"
+            ))
+        });
 
     let sha_tagged_commit = res_tag.object.sha;
 
@@ -80,7 +93,9 @@ pub fn create_new_project(folder_name: Option<String>, template: Option<String>)
         ))
         .send()
         .unwrap_or_else(|_| {
-            panic!("Failed to call the tagged commit tree github API for v{cli_version}")
+            exit_with_error(&format!(
+                "Failed to call the tagged commit tree github API for v{cli_version}"
+            ))
         })
         .json::<GithubTreeResponse<GithubFile>>()
         .expect("Failed to parse the tree structure");
@@ -112,7 +127,7 @@ pub fn create_new_project(folder_name: Option<String>, template: Option<String>)
     let folder_path = current_dir.join(folder_name);
 
     create_directories(&new_project_files, &folder_path, &template)
-        .expect("Failed to create directories");
+        .unwrap_or_else(|err| exit_with_error(&format!("Failed to create directories: {}", err)));
 
     for GithubFile {
         element_type, path, ..
@@ -122,15 +137,21 @@ pub fn create_new_project(folder_name: Option<String>, template: Option<String>)
             let file_content = client
                 .get(format!("{GITHUB_RAW_CONTENT_URL}/v{cli_version}/{path}"))
                 .send()
-                .expect("Failed to call the folder github API")
-                .text()
-                .expect("Failed to parse the repo structure");
+                .map_err(|_| exit_with_error("Failed to call the folder github API"))
+                .and_then(|response| {
+                    response
+                        .text()
+                        .map_err(|_| exit_with_error("Failed to parse the repo structure"))
+                })
+                .unwrap();
 
             let path = PathBuf::from(&path.replace(&format!("examples/{template}/"), ""));
 
             let file_path = folder_path.join(&path);
 
-            create_file(file_path, file_content).expect("failed to create file");
+            if let Err(err) = create_file(file_path, file_content) {
+                exit_with_error(&format!("Failed to create file: {}", err));
+            }
         }
     }
 
@@ -157,36 +178,43 @@ fn create_directories(
     }
     Ok(())
 }
-
 fn update_package_json_version(folder_path: &Path) -> io::Result<()> {
     let v = crate_version!();
     let package_json_path = folder_path.join(PathBuf::from("package.json"));
-    let package_json = fs::read_to_string(&package_json_path)?;
+    let package_json = fs::read_to_string(&package_json_path)
+        .unwrap_or_else(|err| exit_with_error(&format!("Failed to read package.json: {}", err)));
     let package_json = package_json.replace("link:../../packages/tuono", v);
 
     let mut file = OpenOptions::new()
         .write(true)
         .truncate(true)
-        .open(package_json_path)?;
+        .open(package_json_path)
+        .unwrap_or_else(|err| exit_with_error(&format!("Failed to open package.json: {}", err)));
 
-    file.write_all(package_json.as_bytes())?;
+    file.write_all(package_json.as_bytes())
+        .unwrap_or_else(|err| {
+            exit_with_error(&format!("Failed to write to package.json: {}", err))
+        });
 
     Ok(())
 }
 
 fn update_cargo_toml_version(folder_path: &Path) -> io::Result<()> {
     let v = crate_version!();
     let cargo_toml_path = folder_path.join(PathBuf::from("Cargo.toml"));
-    let cargo_toml = fs::read_to_string(&cargo_toml_path)?;
+    let cargo_toml = fs::read_to_string(&cargo_toml_path)
+        .unwrap_or_else(|err| exit_with_error(&format!("Failed to read Cargo.toml: {}", err)));
     let cargo_toml =
         cargo_toml.replace("{ path = \"../../crates/tuono_lib/\"}", &format!("\"{v}\""));
 
     let mut file = OpenOptions::new()
         .write(true)
         .truncate(true)
-        .open(cargo_toml_path)?;
+        .open(cargo_toml_path)
+        .unwrap_or_else(|err| exit_with_error(&format!("Failed to open Cargo.toml: {}", err)));
 
-    file.write_all(cargo_toml.as_bytes())?;
+    file.write_all(cargo_toml.as_bytes())
+        .unwrap_or_else(|err| exit_with_error(&format!("Failed to write to Cargo.toml: {}", err)));
 
     Ok(())
 }