feat(scaffold): overwrite argument (#63)

src/main.rs

@@ -20,6 +20,7 @@ mod args {
         Scaffold {
             day: Day,
             download: bool,
+            overwrite: bool,
         },
         Solve {
             day: Day,
@@ -65,6 +66,7 @@ mod args {
             Some("scaffold") => AppArguments::Scaffold {
                 day: args.free_from_str()?,
                 download: args.contains("--download"),
+                overwrite: args.contains("--overwrite"),
             },
             Some("solve") => AppArguments::Solve {
                 day: args.free_from_str()?,
@@ -104,8 +106,8 @@ fn main() {
             AppArguments::Time { day, all, store } => time::handle(day, all, store),
             AppArguments::Download { day } => download::handle(day),
             AppArguments::Read { day } => read::handle(day),
-            AppArguments::Scaffold { day, download } => {
+            AppArguments::Scaffold { day, download, overwrite } => {
-                scaffold::handle(day);
+                scaffold::handle(day, overwrite);
                 if download {
                     download::handle(day);
                 }
@@ -120,7 +122,7 @@ fn main() {
             AppArguments::Today => {
                 match Day::today() {
                     Some(day) => {
-                        scaffold::handle(day);
+                        scaffold::handle(day, false);
                         download::handle(day);
                         read::handle(day)
                     }

src/template/commands/scaffold.rs

@@ -9,8 +9,14 @@ use crate::template::Day;
 const MODULE_TEMPLATE: &str =
     include_str!(concat!(env!("CARGO_MANIFEST_DIR"), "/src/template.txt"));
 
-fn safe_create_file(path: &str) -> Result<File, std::io::Error> {
+fn safe_create_file(path: &str, overwrite: bool) -> Result<File, std::io::Error> {
-    OpenOptions::new().write(true).create_new(true).open(path)
+    let mut file = OpenOptions::new();
+    if overwrite {
+        file.create(true);
+    } else {
+        file.create_new(true);
+    }
+    file.truncate(true).write(true).open(path)
 }
 
 fn create_file(path: &str) -> Result<File, std::io::Error> {
@@ -21,12 +27,12 @@ fn create_file(path: &str) -> Result<File, std::io::Error> {
         .open(path)
 }
 
-pub fn handle(day: Day) {
+pub fn handle(day: Day, overwrite: bool) {
     let input_path = format!("data/inputs/{day}.txt");
     let example_path = format!("data/examples/{day}.txt");
     let module_path = format!("src/bin/{day}.rs");
 
-    let mut file = match safe_create_file(&module_path) {
+    let mut file = match safe_create_file(&module_path, overwrite) {
         Ok(file) => file,
         Err(e) => {
             eprintln!("Failed to create module file: {e}");