Done?

.gitignore

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+# Created by .ignore support plugin (hsz.mobi)
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/dictionaries
+.idea/vcs.xml
+.idea/jsLibraryMappings.xml
+
+# Sensitive or high-churn files:
+.idea/dataSources.ids
+.idea/dataSources.xml
+.idea/dataSources.local.xml
+.idea/sqlDataSources.xml
+.idea/dynamic.xml
+.idea/uiDesigner.xml
+
+# Gradle:
+.idea/gradle.xml
+.idea/libraries
+
+# Mongo Explorer plugin:
+.idea/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+### Dart template
+# See https://www.dartlang.org/tools/private-files.html
+
+# Files and directories created by pub
+.buildlog
+.packages
+.project
+.pub/
+build/
+**/packages/
+
+# Files created by dart2js
+# (Most Dart developers will use pub build to compile Dart, use/modify these
+#  rules if you intend to use dart2js directly
+#  Convention is to use extension '.dart.js' for Dart compiled to Javascript to
+#  differentiate from explicit Javascript files)
+*.dart.js
+*.part.js
+*.js.deps
+*.js.map
+*.info.json
+
+# Directory created by dartdoc
+doc/api/
+
+# Don't commit pubspec lock file
+# (Library packages only! Remove pattern if developing an application package)
+pubspec.lock
+
+.idea/

.idea/angel_configuration.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.pub" />
+      <excludeFolder url="file://$MODULE_DIR$/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/test/config/packages" />
+      <excludeFolder url="file://$MODULE_DIR$/test/packages" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Dart SDK" level="application" />
+    <orderEntry type="library" name="Dart Packages" level="project" />
+  </component>
+</module>

.idea/encodings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="PROJECT" charset="UTF-8" />
+  </component>
+</project>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="PhpWorkspaceProjectConfiguration" backward_compatibility_performed="true" />
+  <component name="ProjectLevelVcsManager" settingsEditedManually="false">
+    <OptionsSetting value="true" id="Add" />
+    <OptionsSetting value="true" id="Remove" />
+    <OptionsSetting value="true" id="Checkout" />
+    <OptionsSetting value="true" id="Update" />
+    <OptionsSetting value="true" id="Status" />
+    <OptionsSetting value="true" id="Edit" />
+    <ConfirmationsSetting value="0" id="Add" />
+    <ConfirmationsSetting value="0" id="Remove" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/angel_configuration.iml" filepath="$PROJECT_DIR$/.idea/angel_configuration.iml" />
+    </modules>
+  </component>
+</project>

.idea/runConfigurations/All_Tests.xml

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+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="All Tests" type="DartTestRunConfigurationType" factoryName="Dart Test" singleton="true">
+    <option name="envs">
+      <entry key="ANGEL_ENV" value="development" />
+    </option>
+    <option name="filePath" value="$PROJECT_DIR$/test/all_tests.dart" />
+    <method />
+  </configuration>
+</component>

README.md

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+# Angel Configuration
+YAML configuration loader for Angel.
+
+# About
+Any web app needs different configuration for development and production. This plugin will search
+for a `config/default.yaml` file. If it is found, configuratiom from it is loaded into `angel.properties`.
+Then, it will look for a `config/$ANGEL_ENV` file. (i.e. config/development.yaml). If this found, all of its
+configuration be loaded, and will override anything loaded from the `default.yaml` file. This allows for your
+app to work under different conditions without you re-coding anything. :)
+
+# Installation
+In `pubspec.yaml`:
+
+    dependencies:
+        angel_framework: ^0.0.0-dev
+        angel_static: ^1.0.0-beta
+
+# Usage
+
+```dart
+import 'dart:io';
+import 'package:angel_framework/angel_framework.dart';
+import 'package:angel_configuration/angel_configuration.dart';
+
+main() async {
+    Angel angel = new Angel();
+    angel.configure(loadConfigurationFile()); // It's that easy
+}
+```
+
+`loadConfigurationFile` also accepts a `sourceDirectory` or `overrideEnvironmentName` parameter.
+The former will allow you to search in a directory other than `config`, and the latter lets you
+override `$ANGEL_ENV` by specifying a specific configuration name to look for (i.e. 'production').

lib/angel_configuration.dart

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+library angel_configuration;
+
+import 'dart:io';
+import 'package:angel_framework/angel_framework.dart';
+import 'package:yaml/yaml.dart';
+
+_loadYamlFile(Angel app, File yamlFile) {
+  if (yamlFile.existsSync()) {
+    Map config = loadYaml(yamlFile.readAsStringSync());
+    for (String key in config.keys) {
+      app.properties[key] = config[key];
+    }
+  }
+}
+
+loadConfigurationFile(
+    {String directoryPath: "./config", String overrideEnvironmentName}) {
+  return (Angel app) {
+    Directory sourceDirectory = new Directory(directoryPath);
+    String environmentName = Platform.environment['ANGEL_ENV'] ?? 'development';
+
+    if (overrideEnvironmentName != null) {
+      environmentName = overrideEnvironmentName;
+    }
+
+    File defaultYaml = new File.fromUri(
+        sourceDirectory.absolute.uri.resolve("default.yaml"));
+    _loadYamlFile(app, defaultYaml);
+
+    String configFilePath = "$environmentName.yaml";
+    File configFile = new File.fromUri(
+        sourceDirectory.absolute.uri.resolve(configFilePath));
+
+    _loadYamlFile(app, configFile);
+  };
+}

pubspec.yaml

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+name: angel_configuration
+description: YAML configuration loader for Angel.
+version: 1.0.0-dev
+author: thosakwe <thosakwe@gmail.com>
+homepage: https://github.com/angel-dart/angel_configuration
+dependencies:
+  angel_framework: ">=0.0.0-dev < 0.1.0"
+  yaml: ">= 2.1.8 < 2.2.0"
+dev_dependencies:
+  test: ">= 0.12.13 < 0.13.0"

test/all_tests.dart

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+import 'package:angel_framework/angel_framework.dart';
+import 'package:angel_configuration/angel_configuration.dart';
+import 'package:test/test.dart';
+
+main() {
+  // Note: Set ANGEL_ENV to 'development'
+
+  Angel angel = new Angel();
+
+  test('can load based on ANGEL_ENV', () {
+    angel.configure(loadConfigurationFile(directoryPath: './test/config'));
+    expect(angel.properties['hello'], equals('world'));
+    expect(angel.properties['foo']['version'], equals('bar'));
+  });
+
+  test('will load default.yaml if exists', () {
+    expect(angel.properties["set_via"], equals("default"));
+  });
+
+
+  test('can override ANGEL_ENV', () {
+    angel.configure(loadConfigurationFile(
+        directoryPath: './test/config', overrideEnvironmentName: 'override'));
+    expect(angel.properties['hello'], equals('goodbye'));
+    expect(angel.properties['foo']['version'], equals('baz'));
+  });
+}

test/config/default.yaml

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+set_via: default

test/config/development.yaml

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+hello: world
+foo:
+  version: bar

test/config/override.yaml

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+hello: goodbye
+foo:
+  version: baz