feat: allow to write schema to any type who impl Write

src/bin/cli/main.rs

@@ -30,6 +30,9 @@ enum Commands {
     Discover {
         /// Schema to discover, it defaults to `public` in postures.
         schema: Option<String>,
+
+        #[arg(short = 'o', long)]
+        output: Option<String>,
     },
 }
 
@@ -48,7 +51,9 @@ async fn main() -> Result<()> {
     // matches just as you would the top level cmd
     let result = match &cli.command {
         Commands::Query { sql } => sql::handle_query(url, sql).await,
-        Commands::Discover { schema } => sql::discover_scheme(url, schema.to_owned()).await,
+        Commands::Discover { schema, output } => {
+            sql::discover_scheme(url, schema.to_owned(), output.to_owned()).await
+        }
     };
 
     if let Err(err) = result {

src/sql.rs

@@ -1,4 +1,6 @@
+use std::fs::File;
 use std::io;
+use std::path::Path;
 
 use clap::ValueEnum;
 use sea_schema::postgres::discovery::SchemaDiscovery;
@@ -45,7 +47,11 @@ pub async fn handle_query(url: String, query: &String) -> Result<()> {
     return Ok(());
 }
 
-pub async fn discover_scheme(url: String, schema: Option<String>) -> Result<()> {
+pub async fn discover_scheme(
+    url: String,
+    schema: Option<String>,
+    output: Option<String>,
+) -> Result<()> {
     let (_, db_name) = get_connector(&url).await?;
 
     let schema_discovery = match db_name.as_str() {
@@ -69,7 +75,12 @@ pub async fn discover_scheme(url: String, schema: Option<String>) -> Result<()>
         .schemas
         .insert(schema.schema.to_owned(), Schema::from(schema));
 
-    data_model.write(&mut io::stdout())?;
+    let mut buffer: Box<dyn io::Write> = match output {
+        Some(path) => Box::new(File::create(Path::new(&path))?),
+        None => Box::new(io::stdout()),
+    };
+
+    data_model.write(&mut buffer)?;
 
     Ok(())
 }

src/sql/schema.rs

@@ -48,8 +48,8 @@ impl DataModel {
 }
 
 impl DataModel {
-    pub fn write<T: Write>(&self, writter: &mut T) -> error::Result<()> {
+    pub fn write<T: Write>(&self, buffer: &mut T) -> error::Result<()> {
-        writter.write_all(self.to_string().as_bytes())?;
+        buffer.write_all(self.to_string().as_bytes())?;
         Ok(())
     }
 }