Added a .gitignore file for migration folder (#1334)

* added .gitignore file

* add .gitignore

* only add .gitignore if not in a existing git repo

* Use `git2` to detect git repository

---------

Co-authored-by: Billy Chan <ccw.billy.123@gmail.com>

sea-orm-cli/Cargo.toml

@@ -45,6 +45,7 @@ tracing = { version = "0.1", default-features = false }
 url = { version = "2.2", default-features = false }
 chrono = { version = "0.4.20", default-features = false, features = ["clock"] }
 regex = { version = "1", default-features = false }
+git2 = { version = "0.16", default-features = false }
 
 [dev-dependencies]
 smol = "1.2.5"

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

@@ -89,6 +89,10 @@ pub fn run_migrate_init(migration_dir: &str) -> Result<(), Box<dyn Error>> {
             let fn_content = |content: String| content;
             write_file!($filename, $filename, fn_content);
         };
+        ($filename: literal, $template: literal) => {
+            let fn_content = |content: String| content;
+            write_file!($filename, $template, fn_content);
+        };
         ($filename: literal, $template: literal, $fn_content: expr) => {
             let filepath = [&migration_dir, $filename].join("");
             println!("Creating file `{}`", filepath);
@@ -113,6 +117,9 @@ pub fn run_migrate_init(migration_dir: &str) -> Result<(), Box<dyn Error>> {
         content.replace("<sea-orm-migration-version>", &ver)
     });
     write_file!("README.md");
+    if git2::Repository::discover(Path::new(&migration_dir)).is_ok() {
+        write_file!(".gitignore", "_gitignore");
+    }
     println!("Done!");
 
     Ok(())

sea-orm-cli/template/migration/_gitignore

@@ -0,0 +1 @@
+/target