Introduce AsyncWebServerVersion.h to more easily manage and use library version

Author: mathieucarbou

src/AsyncWebServerVersion.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Major version number (X.x.x) */
+#define ASYNCWEBSERVER_VERSION_MAJOR 3
+/** Minor version number (x.X.x) */
+#define ASYNCWEBSERVER_VERSION_MINOR 6
+/** Patch version number (x.x.X) */
+#define ASYNCWEBSERVER_VERSION_PATCH 2
+
+/**
+ * Macro to convert version number into an integer
+ *
+ * To be used in comparisons, such as ASYNCWEBSERVER_VERSION >= ASYNCWEBSERVER_VERSION_VAL(2, 0, 0)
+ */
+#define ASYNCWEBSERVER_VERSION_VAL(major, minor, patch) ((major << 16) | (minor << 8) | (patch))
+
+/**
+ * Current version, as an integer
+ *
+ * To be used in comparisons, such as ASYNCWEBSERVER_VERSION_NUM >= ASYNCWEBSERVER_VERSION_VAL(2, 0, 0)
+ */
+#define ASYNCWEBSERVER_VERSION_NUM ASYNCWEBSERVER_VERSION_VAL(ASYNCWEBSERVER_VERSION_MAJOR, ASYNCWEBSERVER_VERSION_MINOR, ASYNCWEBSERVER_VERSION_PATCH)
+
+/**
+ * Current version, as string
+ */
+#define df2xstr(s)              #s
+#define df2str(s)               df2xstr(s)
+#define ASYNCWEBSERVER_VERSION df2str(ASYNCWEBSERVER_VERSION_MAJOR) "." df2str(ASYNCWEBSERVER_VERSION_MINOR) "." df2str(ASYNCWEBSERVER_VERSION_PATCH)
+
+#ifdef __cplusplus
+}
+#endif

src/ESPAsyncWebServer.h

@@ -46,14 +46,11 @@
   #error Platform not supported
 #endif
 
-#include "literals.h"
-
-#define ASYNCWEBSERVER_VERSION          "3.6.2"
-#define ASYNCWEBSERVER_VERSION_MAJOR    3
-#define ASYNCWEBSERVER_VERSION_MINOR    6
-#define ASYNCWEBSERVER_VERSION_REVISION 2
 #define ASYNCWEBSERVER_FORK_ESP32Async
 
+#include "AsyncWebServerVersion.h"
+#include "literals.h"
+
 #ifdef ASYNCWEBSERVER_REGEX
   #define ASYNCWEBSERVER_REGEX_ATTRIBUTE
 #else