Don't spam migration output during test runs

Rust *should* be swallowing all stdout output during test runs, but for
some reason it isn't. This appears to be due to
rust-lang/rust#12309. However, we can't have
out test suite spam to the point of unreadability until that's fixed, so
let's just not output from migrations during tests.

This was paired, so it has been committed without PR.

Fixes #156.

diesel/src/migrations/mod.rs

@@ -61,6 +61,8 @@ mod schema;
 
 pub use self::migration_error::*;
 
+use std::io::{stdout, Write};
+
 use ::expression::expression_methods::*;
 use ::query_dsl::*;
 use self::migration::*;
@@ -92,11 +94,11 @@ pub fn run_pending_migrations<Conn>(conn: &Conn) -> Result<(), RunMigrationsErro
     String: FromSql<VarChar, Conn::Backend>,
 {
     let migrations_dir = try!(find_migrations_directory());
-    run_pending_migrations_in_directory(conn, &migrations_dir)
+    run_pending_migrations_in_directory(conn, &migrations_dir, &mut stdout())
 }
 
 #[doc(hidden)]
-pub fn run_pending_migrations_in_directory<Conn>(conn: &Conn, migrations_dir: &Path)
+pub fn run_pending_migrations_in_directory<Conn>(conn: &Conn, migrations_dir: &Path, output: &mut Write)
     -> Result<(), RunMigrationsError> where
         Conn: Connection,
         String: FromSql<VarChar, Conn::Backend>,
@@ -107,7 +109,7 @@ pub fn run_pending_migrations_in_directory<Conn>(conn: &Conn, migrations_dir: &P
     let pending_migrations = all_migrations.into_iter().filter(|m| {
         !already_run.contains(m.version())
     });
-    run_migrations(conn, pending_migrations.collect())
+    run_migrations(conn, pending_migrations.collect(), output)
 }
 
 /// Reverts the last migration that was run. Returns the version that was reverted. Returns an
@@ -121,22 +123,26 @@ pub fn revert_latest_migration<Conn>(conn: &Conn) -> Result<String, RunMigration
 {
     try!(create_schema_migrations_table_if_needed(conn));
     let latest_migration_version = try!(latest_run_migration_version(conn));
-    revert_migration_with_version(conn, &latest_migration_version)
+    revert_migration_with_version(conn, &latest_migration_version, &mut stdout())
         .map(|_| latest_migration_version)
 }
 
 #[doc(hidden)]
-pub fn revert_migration_with_version<Conn: Connection>(conn: &Conn, ver: &str) -> Result<(), RunMigrationsError> {
+pub fn revert_migration_with_version<Conn: Connection>(conn: &Conn, ver: &str, output: &mut Write)
+    -> Result<(), RunMigrationsError>
+{
     migration_with_version(ver)
         .map_err(|e| e.into())
-        .and_then(|m| revert_migration(conn, m))
+        .and_then(|m| revert_migration(conn, m, output))
 }
 
 #[doc(hidden)]
-pub fn run_migration_with_version<Conn: Connection>(conn: &Conn, ver: &str) -> Result<(), RunMigrationsError> {
+pub fn run_migration_with_version<Conn: Connection>(conn: &Conn, ver: &str, output: &mut Write)
+    -> Result<(), RunMigrationsError>
+{
     migration_with_version(ver)
         .map_err(|e| e.into())
-        .and_then(|m| run_migration(conn, m))
+        .and_then(|m| run_migration(conn, m, output))
 }
 
 fn migration_with_version(ver: &str) -> Result<Box<Migration>, MigrationError> {
@@ -196,21 +202,21 @@ fn migrations_in_directory(path: &Path) -> Result<Vec<Box<Migration>>, Migration
         }).collect()
 }
 
-fn run_migrations<Conn: Connection>(conn: &Conn, mut migrations: Vec<Box<Migration>>)
+fn run_migrations<Conn: Connection>(conn: &Conn, mut migrations: Vec<Box<Migration>>, output: &mut Write)
     -> Result<(), RunMigrationsError>
 {
     migrations.sort_by(|a, b| a.version().cmp(b.version()));
     for migration in migrations {
-        try!(run_migration(conn, migration));
+        try!(run_migration(conn, migration, output));
     }
     Ok(())
 }
 
-fn run_migration<Conn: Connection>(conn: &Conn, migration: Box<Migration>)
+fn run_migration<Conn: Connection>(conn: &Conn, migration: Box<Migration>, output: &mut Write)
     -> Result<(), RunMigrationsError>
 {
     conn.transaction(|| {
-        println!("Running migration {}", migration.version());
+        try!(writeln!(output, "Running migration {}", migration.version()));
         try!(migration.run(conn));
         try!(::insert(&NewMigration(migration.version()))
              .into(__diesel_schema_migrations)
@@ -219,11 +225,11 @@ fn run_migration<Conn: Connection>(conn: &Conn, migration: Box<Migration>)
     }).map_err(|e| e.into())
 }
 
-fn revert_migration<Conn: Connection>(conn: &Conn, migration: Box<Migration>)
+fn revert_migration<Conn: Connection>(conn: &Conn, migration: Box<Migration>, output: &mut Write)
     -> Result<(), RunMigrationsError>
 {
     try!(conn.transaction(|| {
-        println!("Rolling back migration {}", migration.version());
+        try!(writeln!(output, "Rolling back migration {}", migration.version()));
         try!(migration.revert(conn));
         let target = __diesel_schema_migrations.filter(version.eq(migration.version()));
         try!(::delete(target).execute(conn));

diesel_tests/build.rs

@@ -30,13 +30,14 @@ extern crate dotenv;
 use diesel::*;
 use diesel::connection::PgConnection;
 use dotenv::dotenv;
+use std::io;
 
 fn main() {
     dotenv().ok();
     let database_url = ::std::env::var("DATABASE_URL")
         .expect("DATABASE_URL must be set to run tests");
     let connection = PgConnection::establish(&database_url).unwrap();
     let migrations_dir = migrations::find_migrations_directory().unwrap().join("postgresql");
-    migrations::run_pending_migrations_in_directory(&connection, &migrations_dir).unwrap();
+    migrations::run_pending_migrations_in_directory(&connection, &migrations_dir, &mut io::sink()).unwrap();
     inner::main();
 }

diesel_tests/tests/schema.rs

@@ -127,9 +127,11 @@ pub fn connection_without_transaction() -> TestConnection {
 
 #[cfg(feature = "sqlite")]
 pub fn connection_without_transaction() -> TestConnection {
+    use std::io;
+
     let connection = ::diesel::connection::SqliteConnection::establish(":memory:").unwrap();
     let migrations_dir = migrations::find_migrations_directory().unwrap().join("sqlite");
-    migrations::run_pending_migrations_in_directory(&connection, &migrations_dir).unwrap();
+    migrations::run_pending_migrations_in_directory(&connection, &migrations_dir, &mut io::sink()).unwrap();
     connection
 }