Add a formatter

tests/formatting/correct1.blp

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+using Gtk 4.0;
+using Adw 1;
+
+template $MyTemplate: Label {
+  /**
+   * A list of strings.
+   */
+  StringList {
+    // comment
+    strings [
+      "Hello",
+      C_("Greeting", "World"),
+    ]
+  }
+
+  object: Button {
+    label: "Click me";
+  };
+
+  flags: a | b;
+
+  [child]
+  Label {
+  }
+
+  [child]
+  Label label2 {
+  }
+
+  // Single line comment.
+
+  /**
+   * Multiline comment.
+   */
+  // Single line comment.
+  value: bind 1.0 as <double>;
+  as: 1;
+  signal => $on_signal() after;
+}
+
+Dialog {
+  [action response=ok]
+  $MyButton {
+  }
+}
+
+menu menu {
+  item ("test")
+
+  item {
+    label: "test";
+  }
+
+  item ("test")
+}
+
+Adw.MessageDialog {
+  responses [
+    save: "Save" suggested disabled,
+  ]
+}
+
+Adw.Breakpoint {
+  condition ("width < 100")
+
+  setters {
+    label2.label: _("Hello, world!");
+    label2.visible: false;
+    label2.extra-menu: null;
+  }
+}

tests/formatting/in1.blp

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+using Gtk 4.0;using Adw 1;Overlay{Label label{label:_("'Hello World!' \"\n\t\"");}[overlay]Button{notify::icon-name=>$on_icon_name_changed(label)swapped;styles["destructive"]}visible:bind $isVisible(label.visible,my-menu)as<bool>;width-request:bind label.width-request no-sync-create;}menu my-menu{item(_("Label"), "action-name", "icon-name")item{action:"win.format";}}

tests/formatting/in2.blp

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+using Gtk 4.0;
+
+    using Adw 1;
+
+Overlay {
+
+Label
+label
+{
+label
+:
+_
+(
+"'Hello World!' \"\n\t\""
+)
+;
+}
+[
+    overlay
+] Button
+{ notify
+:: icon-name
+=> $ on_icon_name_changed ( label )
+swapped ;
+styles
+[ "destructive" ]
+}
+visible
+: bind $ isVisible ( label.visible ,
+my-menu ) as
+ < bool > ; width-request : bind label . width-request no-sync-create ; }
+                menu my-menu
+{ item ( _ ( "Label" ) , "action-name" , "icon-name" ) item { action : "win.format" ; } }
+
+
+
+
+
+
+

tests/formatting/out.blp

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+using Gtk 4.0;
+using Adw 1;
+
+Overlay {
+  Label label {
+    label: _("'Hello World!' \"\n\t\"");
+  }
+
+  [overlay]
+  Button {
+    notify::icon-name => $on_icon_name_changed(label) swapped;
+
+    styles [
+      "destructive"
+    ]
+  }
+
+  visible: bind $isVisible(label.visible, my-menu) as <bool>;
+  width-request: bind label.width-request no-sync-create;
+}
+
+menu my-menu {
+  item (_("Label"), "action-name", "icon-name")
+
+  item {
+    action: "win.format";
+  }
+}

tests/formatting/string_in.blp

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+using Gtk 4.0;
+
+Label {
+  label: "\"'\'\t\n\\'";
+}

tests/formatting/string_out.blp

@@ -0,0 +1,5 @@
+using Gtk 4.0;
+
+Label {
+  label: "\"'\'\t\n\\'";
+}