Add ability to change configuration from Ruby

- `System.config` has become `CONFIG.to_hash`
- `CONFIG[]` can be used to look up settings
- `CONFIG[]=` can be used to add/change settings
- When reading settings, user settings are preferred over defaults
- Changes are immediately stored in the user settings file

binding/binding-mri.cpp

@@ -135,6 +135,10 @@ RB_METHOD(mkxpAddPath);
 RB_METHOD(mkxpRemovePath);
 RB_METHOD(mkxpLaunch);
 
+RB_METHOD(mkxpGetJSONSetting);
+RB_METHOD(mkxpSetJSONSetting);
+RB_METHOD(mkxpGetAllJSONSettings);
+
 RB_METHOD(mkxpSetDefaultFontFamily);
 
 RB_METHOD(mriRgssMain);
@@ -145,6 +149,7 @@ RB_METHOD(mkxpStringToUTF8);
 RB_METHOD(mkxpStringToUTF8Bang);
 
 VALUE json2rb(json5pp::value const &v);
+json5pp::value rb2json(VALUE v);
 
 static void mriBindingInit() {
     tableBindingInit();
@@ -245,6 +250,11 @@ static void mriBindingInit() {
     _rb_define_method(rb_cString, "to_utf8", mkxpStringToUTF8);
     _rb_define_method(rb_cString, "to_utf8!", mkxpStringToUTF8Bang);
     
+    VALUE cmod = rb_define_module("CONFIG");
+    _rb_define_module_function(cmod, "[]", mkxpGetJSONSetting);
+    _rb_define_module_function(cmod, "[]=", mkxpSetJSONSetting);
+    _rb_define_module_function(cmod, "to_hash", mkxpGetAllJSONSettings);
+    
     /* Load global constants */
     rb_gv_set("MKXP", Qtrue);
     
@@ -260,10 +270,6 @@ static void mriBindingInit() {
     rb_str_freeze(vers);
     rb_define_const(mod, "VERSION", vers);
     
-    VALUE cfg = json2rb(shState->config().raw);
-    rb_hash_freeze(cfg);
-    rb_define_const(mod, "CONFIG", cfg);
-
     // Set $stdout and its ilk accordingly on Windows
     // I regret teaching you that word
 #ifdef __WIN32__
@@ -456,8 +462,8 @@ RB_METHOD(mkxpUserLanguage) {
 RB_METHOD(mkxpUserName) {
     RB_UNUSED_PARAM;
     
-// Using the Windows API isn't working with usernames that involve Unicode
-// characters for some dumb reason
+    // Using the Windows API isn't working with usernames that involve Unicode
+    // characters for some dumb reason
 #ifdef __WIN32__
     VALUE env = rb_const_get(rb_mKernel, rb_intern("ENV"));
     return rb_funcall(env, rb_intern("[]"), 1, rb_str_new_cstr("USERNAME"));
@@ -652,6 +658,70 @@ RB_METHOD(mkxpLaunch) {
     return RUBY_Qnil;
 }
 
+json5pp::value userSettings;
+
+void loadUserSettings() {
+    if (!userSettings.is_null())
+        return;
+    
+    VALUE cpath = rb_utf8_str_new_cstr(shState->config().userConfPath.c_str());
+    
+    if (rb_funcall(rb_cFile, rb_intern("exists?"), 1, cpath) == Qtrue) {
+        VALUE f = rb_funcall(rb_cFile, rb_intern("open"), 2, cpath, rb_str_new("r", 1));
+        VALUE data = rb_funcall(f, rb_intern("read"), 0);
+        rb_funcall(f, rb_intern("close"), 0);
+        userSettings = rb2json(data);
+    }
+    
+    if (!userSettings.is_object())
+        userSettings = json5pp::object({});
+}
+
+void saveUserSettings() {
+    VALUE cpath = rb_utf8_str_new_cstr(shState->config().userConfPath.c_str());
+    VALUE f = rb_funcall(rb_cFile, rb_intern("open"), 2, cpath, rb_str_new("w", 1));
+    rb_funcall(f, rb_intern("write"), 1, rb_utf8_str_new_cstr(userSettings.stringify5(json5pp::rule::space_indent<>()).c_str()));
+    rb_funcall(f, rb_intern("close"), 0);
+}
+
+RB_METHOD(mkxpGetJSONSetting) {
+    RB_UNUSED_PARAM;
+    
+    VALUE sname;
+    rb_scan_args(argc, argv, "1", &sname);
+    SafeStringValue(sname);
+    
+    loadUserSettings();
+    auto &s = userSettings.as_object();
+    
+    if (s[RSTRING_PTR(sname)].is_null()) {
+        return json2rb(shState->config().raw.as_object()[RSTRING_PTR(sname)]);
+    }
+    
+    return json2rb(s[RSTRING_PTR(sname)]);
+    
+}
+
+RB_METHOD(mkxpSetJSONSetting) {
+    RB_UNUSED_PARAM;
+    
+    VALUE sname, svalue;
+    rb_scan_args(argc, argv, "2", &sname, &svalue);
+    SafeStringValue(sname);
+    
+    loadUserSettings();
+    userSettings.as_object()[RSTRING_PTR(sname)] = rb2json(svalue);
+    
+    saveUserSettings();
+    return Qnil;
+}
+
+RB_METHOD(mkxpGetAllJSONSettings) {
+    RB_UNUSED_PARAM;
+    
+    return json2rb(shState->config().raw);
+}
+
 static VALUE rgssMainCb(VALUE block) {
     rb_funcall2(block, rb_intern("call"), 0, 0);
     return Qnil;
@@ -912,7 +982,7 @@ static void runRMXPScripts(BacktraceData &btData) {
             
             // Adding a 'not' symbol means it WON'T run on that
             // platform (i.e. |!W| won't run on Windows)
-/*
+            /*
              if (scriptName[0] == '|') {
              int len = strlen(scriptName);
              if (len > 2) {

binding/http-binding.cpp

@@ -311,7 +311,7 @@ RB_METHOD(httpJsonStringify) {
     rb_scan_args(argc, argv, "1", &obj);
     
     json5pp::value v = rb2json(obj);
-    return rb_utf8_str_new_cstr(v.stringify().c_str());
+    return rb_utf8_str_new_cstr(v.stringify5(json5pp::rule::space_indent<>()).c_str());
 }
 
 void httpBindingInit() {

src/config.cpp

@@ -239,7 +239,7 @@ try { exp } catch (...) {}
     readGameINI();
     
     // Now check for an extra mkxp.conf in the user's save directory and merge anything else from that
-    std::string userConfPath = customDataPath + "/" CONF_FILE;
+    userConfPath = customDataPath + "/" CONF_FILE;
     json::value userConf = readConfFile(userConfPath.c_str());
     copyObject(optsJ, userConf);
     

src/config.h

@@ -136,6 +136,8 @@ struct Config {
         std::string r;
     } kbActionNames;
     
+    std::string userConfPath;
+    
     /* Internal */
     std::string customDataPath;