Add config manipulation example

README.md

@@ -17,5 +17,6 @@ This is a work in progress. More will follow. For now see `examples/` to learn h
 TODO: add tutorial on:
 - Config loading
 - Config parsing
+- Config manip
 - Env and config var substitution
 -- Escaping

dub.json

@@ -18,7 +18,7 @@
     {
       "name": "jsonExample",
       "targetType": "executable",
-      "description": "Example of how to read and work with JSON configurations.",
+      "description": "Example on how to read and work with JSON configurations.",
       "targetName": "jsonExample",
       "sourcePaths": ["examples/json"],
       "importPaths": ["source"],
@@ -29,13 +29,24 @@
     {
       "name": "valueSubstitutionExample",
       "targetType": "executable",
-      "description": "Example of how to use environment and config substitution.",
+      "description": "Example on how to use environment and config substitution.",
       "targetName": "valueSubstitutionExample",
       "sourcePaths": ["examples/valueSubstitution"],
       "importPaths": ["source"],
       "copyFiles": ["examples/valueSubstitution/config.json"],
       "targetPath": "bin/examples/valueSubstitution",
       "workingDirectory": "bin/examples/valueSubstitution"
+    },
+    {
+      "name": "manipulationExample",
+      "targetType": "executable",
+      "description": "Example on how to change configuration.",
+      "targetName": "manipulationExample",
+      "sourcePaths": ["examples/manipulation"],
+      "importPaths": ["source"],
+      "copyFiles": ["examples/manipulation/config.json"],
+      "targetPath": "bin/examples/manipulation",
+      "workingDirectory": "bin/examples/manipulation"
     }
   ]
 }

examples/manipulation/app.d

@@ -0,0 +1,22 @@
+module examples.manipulation.app;
+
+/**
+ * Authors:
+ *  Mike Bierlee, m.bierlee@lostmoment.com
+ * Copyright: 2022 Mike Bierlee
+ * License:
+ *  This software is licensed under the terms of the MIT license.
+ *  The full terms of the license can be found in the LICENSE file.
+ */
+
+import mirage.json : loadJsonConfig;
+
+import std.stdio : writeln;
+
+void main() {
+    auto config = loadJsonConfig("config.json");
+    config.set("application.name", "Real HTTP Server");
+
+    auto applicationName = config.get("application.name");
+    writeln(applicationName);
+}

examples/manipulation/config.json

@@ -0,0 +1,5 @@
+{
+  "application": {
+    "name": "Fake HTTP Server"
+  }
+}

makefile

@@ -12,10 +12,14 @@ clean:
 	dub clean
 
 run-examples: run-jsonExample \
-	run-valueSubstitutionExample
+	run-valueSubstitutionExample \
+	run-manipulationExample
 
 run-jsonExample:
 	dub run --build=release --config=jsonExample
 
 run-valueSubstitutionExample:
 	dub run --build=release --config=valueSubstitutionExample
+
+run-manipulationExample:
+	dub run --build=release --config=manipulationExample