Custom: support JSON module

Note: old command options `--set` and `--set-keyless` were removed. To reuse custom module, JSON config must be used.

src/modules/custom/custom.c

@@ -0,0 +1,59 @@
+#include "fastfetch.h"
+#include "common/printing.h"
+#include "modules/custom/custom.h"
+#include "util/textModifier.h"
+
+void ffPrintCustom(FFinstance* instance, FFCustomOptions* options)
+{
+    if (options->moduleArgs.outputFormat.length == 0)
+    {
+        ffPrintError(instance, FF_CUSTOM_MODULE_NAME, 0, &options->moduleArgs, "output format must be set for custom module");
+        return;
+    }
+
+    ffPrintLogoAndKey(instance, options->moduleArgs.key.length == 0 ? NULL : FF_CUSTOM_MODULE_NAME, 0, &options->moduleArgs.key);
+    ffPrintUserString(options->moduleArgs.outputFormat.chars);
+    puts(FASTFETCH_TEXT_MODIFIER_RESET);
+}
+
+void ffInitCustomOptions(FFCustomOptions* options)
+{
+    options->moduleName = FF_CUSTOM_MODULE_NAME;
+    ffOptionInitModuleArg(&options->moduleArgs);
+}
+
+bool ffParseCustomCommandOptions(FFCustomOptions* options, const char* key, const char* value)
+{
+    const char* subKey = ffOptionTestPrefix(key, FF_CUSTOM_MODULE_NAME);
+    if (!subKey) return false;
+    if (ffOptionParseModuleArgs(key, subKey, value, &options->moduleArgs))
+        return true;
+
+    return false;
+}
+
+void ffDestroyCustomOptions(FFCustomOptions* options)
+{
+    ffOptionDestroyModuleArg(&options->moduleArgs);
+}
+
+#ifdef FF_HAVE_JSONC
+void ffParseCustomJsonObject(FFinstance* instance, json_object* module)
+{
+    FFCustomOptions __attribute__((__cleanup__(ffDestroyCustomOptions))) options;
+    ffInitCustomOptions(&options);
+
+    if (module)
+    {
+        json_object_object_foreach(module, key, val)
+        {
+            if (ffJsonConfigParseModuleArgs(key, val, &options.moduleArgs))
+                continue;
+
+            ffPrintError(instance, FF_CUSTOM_MODULE_NAME, 0, &options.moduleArgs, "Unknown JSON key %s", key);
+        }
+    }
+
+    ffPrintCustom(instance, &options);
+}
+#endif

src/modules/custom/custom.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include "fastfetch.h"
+
+#define FF_CUSTOM_MODULE_NAME "Custom"
+
+void ffPrintCustom(FFinstance* instance, FFCustomOptions* options);
+void ffInitCustomOptions(FFCustomOptions* options);
+bool ffParseCustomCommandOptions(FFCustomOptions* options, const char* key, const char* value);
+void ffDestroyCustomOptions(FFCustomOptions* options);
+
+#ifdef FF_HAVE_JSONC
+#include "common/jsonconfig.h"
+void ffParseCustomJsonObject(FFinstance* instance, json_object* module);
+#endif

src/modules/custom/option.h

@@ -0,0 +1,11 @@
+#pragma once
+
+// This file will be included in "fastfetch.h", do NOT put unnecessary things here
+
+#include "common/option.h"
+
+typedef struct FFCustomOptions
+{
+    const char* moduleName;
+    FFModuleArgs moduleArgs;
+} FFCustomOptions;