Use git to retrieve version instead of manually change `PREMAKE_VERSI…

…ON`.

.gitattributes

@@ -1 +1,2 @@
 Bootstrap.bat text eol=crlf
+git-tags.txt export-subst

git-tags.txt

@@ -0,0 +1 @@
+$Format:%(describe)$

premake5.lua

@@ -192,6 +192,24 @@
 --    symbols "On"
 --
 
+	local function retrieve_git_tag()
+		local git_tag, errorCode = os.outputof("git describe --tag --exact-match")
+		if errorCode == 0 then
+			return git_tag
+		else
+			return nil
+		end
+	end
+
+	if premake.action.isConfigurable() then
+		local git_tag = retrieve_git_tag() or io.readfile("git-tags.txt")
+
+		if git_tag == "$Format:%(describe)$" then
+			git_tag = nil
+		end
+		print("Current git tag: ", git_tag)
+	end
+
 	solution "Premake5"
 		configurations { "Release", "Debug" }
 		location ( _OPTIONS["to"] )
@@ -278,6 +296,10 @@
 			"binmodules/**.*"
 		}
 
+		if git_tag then
+			defines { "PREMAKE_VERSION=" .. git_tag }
+		end
+
 		filter { "options:lua-src=contrib" }
 			includedirs { "contrib/lua/src", "contrib/luashim" }
 			links       { "lua-lib" }

src/host/premake.h

@@ -18,7 +18,10 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#define PREMAKE_VERSION        "5.0.0-dev"
+#ifndef PREMAKE_VERSION
+# define PREMAKE_VERSION "5.0.0-dev"
+#endif
+
 #define PREMAKE_COPYRIGHT      "Copyright (C) 2002-2024 Jess Perkins and the Premake Project"
 #define PREMAKE_PROJECT_URL    "https://github.com/premake/premake-core/wiki"