Add INI config factory

README.md

@@ -56,6 +56,7 @@ The following file formats are currently supported:
 | _any below_ | _any below_ | `mirage`           | `loadConfig`<sup>**</sup> | _(N/A)_                         |                         |
 | JSON        | .json       | `mirage.json`      | `loadJsonConfig`          | `parseJsonConfig`<sup>***</sup> | `JsonConfigFactory`     |
 | Java        | .properties | `mirage.java`      | `loadJavaProperties`      | `parseJavaProperties`           | `JavaPropertiesFactory` |
+| INI         | .ini        | `mirage.ini`       | `loadIniConfig`           | `parseIniConfig`                | `IniConfigFactory`      |
 
 <sup>\*</sup> _Any loader or parser can be imported from the `mirage` package since they are all publicly imported._  
 <sup>\*\*</sup> _Loads files based on their extension. If the file does not use one of the extensions in the table, you must use a specific loader._  

TODO.md

@@ -1,12 +1,16 @@
 # TODO
 
-* Add tutorial
-  * Config loading
-  * Config parsing
-  * Config manip
-  * Env and config var substitution
-    * Escaping
-* Java properties
-  * Add unicode escaping
-  * Support multi-line values with backslash
-  * Add escaping of key/value separator = and :
+- Add tutorial
+  - Config loading
+  - Config parsing
+  - Config manip
+  - Env and config var substitution
+    - Escaping
+- Java properties
+  - Add unicode escaping
+  - Support multi-line values with backslash
+  - Add escaping of key/value separator = and :
+- INI config
+  - Case insensitive properties and sections
+  - Escape characters
+  - Support multi-line values with backslash

source/mirage/config.d

@@ -21,6 +21,7 @@ import std.typecons : Flag;
 
 import mirage.json : loadJsonConfig;
 import mirage.java : loadJavaProperties;
+import mirage.ini : loadIniConfig;
 
 /** 
  * Used by the ConfigDictionary when something goes wrong when reading configuration.
@@ -603,6 +604,10 @@ ConfigDictionary loadConfig(const string configPath) {
         return loadJavaProperties(configPath);
     }
 
+    if (extension == ".ini") {
+        return loadIniConfig(configPath);
+    }
+
     throw new ConfigCreationException(
         "File extension '" ~ extension ~ "' is not recognized as a supported config file format. Please use a specific function to load it, such as 'loadJsonConfig()'");
 }
@@ -853,6 +858,11 @@ version (unittest) {
         assert(javaProperties.get("name") == "Groot");
         assert(javaProperties.get("age") == "8728");
         assert(javaProperties.get("taxNumber") == "null");
+
+        auto iniConfig = loadConfig("testfiles/groot.ini");
+        assert(iniConfig.get("groot.name") == "Groot");
+        assert(iniConfig.get("groot.age") == "8728");
+        assert(iniConfig.get("groot.taxNumber") == "null");
     }
 
     @("Whitespace is preserved in values")

source/mirage/ini.d

@@ -0,0 +1,127 @@
+/**
+ * Utilities for loading INI files.
+ *
+ * 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.
+ */
+
+module mirage.ini;
+
+import mirage.config : ConfigDictionary;
+import mirage.keyvalue : KeyValueConfigFactory, SupportHashtagComments, SupportSemicolonComments,
+    SupportExclamationComments, SupportSections, NormalizeQuotedValues, SupportEqualsSeparator,
+    SupportColonSeparator, SupportKeysWithoutValues;
+
+/** 
+ * Creates configuration dictionaries from INI files.
+ *
+ * Format specifications:
+ *   https://en.wikipedia.org/wiki/INI_file#Format
+ */
+class IniConfigFactory : KeyValueConfigFactory!(
+    SupportHashtagComments.yes,
+    SupportSemicolonComments.yes,
+    SupportExclamationComments.no,
+    SupportSections.yes,
+    NormalizeQuotedValues.yes,
+    SupportEqualsSeparator.yes,
+    SupportColonSeparator.yes,
+    SupportKeysWithoutValues.no
+) {
+}
+
+/** 
+ * Parse configuration from the given INI config string.
+
+ * Params:
+ *   contents = Text contents of the config to be parsed.
+ * Returns: The parsed configuration.
+ */
+ConfigDictionary parseIniConfig(const string contents) {
+    return new IniConfigFactory().parseConfig(contents);
+}
+
+/** 
+ * Load a INI configuration file from disk.
+ *
+ * Params:
+ *   filePath = Path to the INI configuration file.
+ * Returns: The loaded configuration.
+ */
+ConfigDictionary loadIniConfig(const string filePath) {
+    return new IniConfigFactory().loadFile(filePath);
+}
+
+version (unittest) {
+    import std.process : environment;
+
+    @("Parse INI config")
+    unittest {
+        auto config = parseIniConfig("
+            globalSection = yes
+
+            [supersection]
+            thefirst = here
+
+            [supersection.sub]
+            sandwich=maybe tasty
+
+            [.way]
+            advertisement? = nah ; For real, not sponsored!
+
+            # Although money would be cool
+            [back]
+            to: basics
+            much = \"very much whitespace\"
+            many = 'very many whitespace'
+        ");
+
+        assert(config.get("globalSection") == "yes");
+        assert(config.get("supersection.thefirst") == "here");
+        assert(config.get("supersection.sub.sandwich") == "maybe tasty");
+        assert(config.get("supersection.sub.way.advertisement?") == "nah");
+        assert(config.get("back.much") == "very much whitespace");
+        assert(config.get("back.many") == "very many whitespace");
+    }
+
+    @("Load INI file")
+    unittest {
+        auto config = loadIniConfig("testfiles/fuzzy.ini");
+
+        assert(config.get("globalSection") == "yes");
+        assert(config.get("supersection.thefirst") == "here");
+        assert(config.get("supersection.sub.sandwich") == "maybe tasty");
+        assert(config.get("supersection.sub.way.advertisement?") == "nah");
+        assert(config.get("back.much") == "very much whitespace");
+        assert(config.get("back.many") == "very many whitespace");
+    }
+
+    @("Substitute env vars")
+    unittest {
+        environment["MIRAGE_TEST_INI_VAR"] = "I am ini";
+        auto config = parseIniConfig("
+            [app]
+            startInfo = ${MIRAGE_TEST_INI_VAR}
+        ");
+
+        assert(config.get("app.startInfo") == "I am ini");
+    }
+
+    @("Use value from other key")
+    unittest {
+        auto config = parseIniConfig("
+            [app]
+            startInfo = \"Let's get started!\"
+
+            [logger]
+            startInfo = ${app.startInfo}
+        ");
+
+        assert(config.get("app.startInfo") == "Let's get started!");
+        assert(config.get("logger.startInfo") == "Let's get started!");
+    }
+}

source/mirage/package.d

@@ -10,6 +10,7 @@
 module mirage;
 
 public import mirage.config;
+public import mirage.ini;
 public import mirage.java;
 public import mirage.json;
 public import mirage.keyvalue;

testfiles/fuzzy.ini

@@ -0,0 +1,16 @@
+globalSection = yes
+
+[supersection]
+thefirst = here
+
+[supersection.sub]
+sandwich=maybe tasty
+
+[.way]
+advertisement? = nah ; For real, not sponsored!
+
+# Although money would be cool
+[back]
+to: basics
+much = "very much whitespace"
+many = 'very many whitespace'

testfiles/groot.ini

@@ -0,0 +1,4 @@
+[groot]
+name=Groot
+age=8728
+taxNumber=null