diff --git a/composer.json b/composer.json
index 03c0a02..698923c 100644
--- a/composer.json
+++ b/composer.json
@@ -65,7 +65,6 @@
 		}
 	},
 	"bin": [
-		"lib/_launch.php",
 		"nur_bin/compctl.php",
 		"nur_bin/compdep.php",
 		"nur_bin/cachectl.php",
diff --git a/src/ext/yaml.php b/src/ext/yaml.php
new file mode 100644
index 0000000..0b63bdd
--- /dev/null
+++ b/src/ext/yaml.php
@@ -0,0 +1,35 @@
+<?php
+namespace nur\sery\ext;
+
+use nur\sery\cl;
+use nur\sery\file;
+use nur\sery\os\IOException;
+use Symfony\Component\Yaml\Exception\ParseException;
+use Symfony\Component\Yaml\Yaml as SymfonyYaml;
+
+/**
+ * Class yaml: lecture de données yaml
+ */
+class yaml {
+  /**
+   * @throws IOException si une erreur de lecture s'est produite
+   */
+  static final function load($input): array {
+    $contents = file::reader($input)->getContents();
+    try {
+      return cl::with(SymfonyYaml::parse($contents));
+    } catch (ParseException $e) {
+      $message = "parse error";
+      if (is_string($input)) $message .= " while loading $input";
+      throw new IOException($message, 0, $e);
+    }
+  }
+
+  static final function with($data, int $indent=2, int $flags=0): string {
+    return SymfonyYaml::dump($data, PHP_INT_MAX, $indent, $flags);
+  }
+
+  static final function dump($data, $output=null, int $indent=2, int $flags=0): void {
+    file::writer($output)->putContents(self::with($data, $indent, $flags));
+  }
+}
diff --git a/src/output/std/StdMessenger.php b/src/output/std/StdMessenger.php
index 6468a69..2670213 100644
--- a/src/output/std/StdMessenger.php
+++ b/src/output/std/StdMessenger.php
@@ -7,7 +7,6 @@ use nur\sery\cl;
 use nur\sery\ExceptionShadow;
 use nur\sery\output\IMessenger;
 use nur\sery\UserException;
-use nur\SL;
 use Throwable;
 
 class StdMessenger implements _IMessenger {
@@ -242,7 +241,7 @@ class StdMessenger implements _IMessenger {
                                  int $indentLevel, StdOutput $out): void {
     $prefixes = self::GENERIC_PREFIXES[$level][$type];
     if ($prefixes[0]) $out->print();
-    $content = SL::with($content);
+    $content = cl::with($content);
     if ($out->isColor()) {
       $before = $prefixes[2];
       $prefix = $prefixes[3];
@@ -362,7 +361,7 @@ class StdMessenger implements _IMessenger {
                                    string $type, $content,
                                    int $indentLevel, StdOutput $out): void {
     $prefixes = self::GENERIC_PREFIXES[$level][$type];
-    $content = SL::with($content);
+    $content = cl::with($content);
     if ($out->isColor()) {
       $prefix = $prefixes[1];
       $prefix2 = null;
diff --git a/src/tools/BgLauncherApp.php b/src/tools/BgLauncherApp.php
index 25dd365..2f1146f 100644
--- a/src/tools/BgLauncherApp.php
+++ b/src/tools/BgLauncherApp.php
@@ -2,6 +2,7 @@
 namespace nur\sery\tools;
 
 use nur\sery\ExitError;
+use nur\sery\ext\yaml;
 use nur\sery\os\path;
 use nur\sery\os\proc\Cmd;
 use nur\sery\os\sh;
@@ -9,7 +10,6 @@ use nur\sery\output\msg;
 use nur\sery\app\app;
 use nur\sery\app\cli\Application;
 use nur\sery\app\RunFile;
-use nur\yaml;
 
 class BgLauncherApp extends Application {
   const ACTION_INFOS = 0, ACTION_START = 1, ACTION_STOP = 2;