lib: intro app.nit with logging methods

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/app.nit b/lib/app.nit
new file mode 100644 (file)
index 0000000..b896dad
--- /dev/null
+++ b/lib/app.nit
@@ -0,0 +1,44 @@
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2011-2014 Alexis Laferrière <alexis.laf@xymus.net>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# app.nit is a framework to create cross-platform applications
+#
+# The features offered by this modules are common to all platforms, but
+# may not be available on all devices.
+module app
+
+# App subclasses are cross-platform applications
+#
+# This class is redefed by plateform modules and so
+# App can be specialized directly in the user app.
+class App
+       private init do end
+
+       # Main entry point of your application
+       fun run do end
+
+       # Prefix to all log messages, used by `log_error`, `log_warning` and `log_info`.
+       fun log_prefix: String do return "app.nit"
+
+       # Helper function for logging errors
+       fun log_error(msg: String) do sys.stderr.write "{log_prefix} error: {msg}\n"
+
+       # Helper function for logging warnings
+       fun log_warning(msg: String) do sys.stderr.write "{log_prefix} warn: {msg}\n"
+end
+
+protected fun app: App do return once new App
+app.run