sea-orm-cli migrate init: don't overwrite files by default (#1829)

sea-orm-cli/src/cli.rs

@@ -101,7 +101,10 @@ you should provide the directory of that submodule.",
 #[derive(Subcommand, PartialEq, Eq, Debug)]
 pub enum MigrateSubcommands {
     #[command(about = "Initialize migration directory", display_order = 10)]
-    Init,
+    Init {
+        #[arg(short, long, help = "Overwrite files if the folder already exists")]
+        force: bool,
+    },
     #[command(about = "Generate a new, empty migration", display_order = 20)]
     Generate {
         #[arg(required = true, help = "Name of the new migration")]

sea-orm-cli/src/commands/migrate.rs

@@ -21,7 +21,7 @@ pub fn run_migrate_command(
     verbose: bool,
 ) -> Result<(), Box<dyn Error>> {
     match command {
-        Some(MigrateSubcommands::Init) => run_migrate_init(migration_dir)?,
+        Some(MigrateSubcommands::Init { force }) => run_migrate_init(migration_dir, force)?,
         Some(MigrateSubcommands::Generate {
             migration_name,
             universal_time: _,
@@ -78,11 +78,16 @@ pub fn run_migrate_command(
     Ok(())
 }
 
-pub fn run_migrate_init(migration_dir: &str) -> Result<(), Box<dyn Error>> {
+pub fn run_migrate_init(migration_dir: &str, force: bool) -> Result<(), Box<dyn Error>> {
     let migration_dir = match migration_dir.ends_with('/') {
         true => migration_dir.to_string(),
         false => format!("{migration_dir}/"),
     };
+    if !force && Path::new(&migration_dir).is_dir() {
+        if fs::read_dir(&migration_dir)?.next().transpose()?.is_some() {
+            return Err(Box::new(MigrationCommandError::DirAlreadyExists));
+        }
+    }
     println!("Initializing migration directory...");
     macro_rules! write_file {
         ($filename: literal) => {
@@ -252,13 +257,17 @@ fn update_migrator(migration_name: &str, migration_dir: &str) -> Result<(), Box<
 
 #[derive(Debug)]
 enum MigrationCommandError {
+    DirAlreadyExists,
     InvalidName(String),
 }
 
 impl Display for MigrationCommandError {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            MigrationCommandError::InvalidName(name) => {
+            Self::DirAlreadyExists => {
+                write!(f, "Migration directory already exists! Use `--force` flag if you want to overwrite it anyway.")
+            }
+            Self::InvalidName(name) => {
                 write!(f, "Invalid migration name: {name}")
             }
         }