From 0f919391c2ad24f64d8aed6a87d58eab63b6c584 Mon Sep 17 00:00:00 2001
From: Jarod42 <Jarod42@users.noreply.github.com>
Date: Tue, 31 Dec 2024 10:33:36 +0100
Subject: [PATCH] Use git to retrieve version instead of manually change
 `PREMAKE_VERSION`.

---
 .gitattributes     |  1 +
 git-tags.txt       |  1 +
 premake5.lua       | 25 +++++++++++++++++++++++++
 src/host/premake.h |  5 ++++-
 4 files changed, 31 insertions(+), 1 deletion(-)
 create mode 100644 git-tags.txt

diff --git a/.gitattributes b/.gitattributes
index b04e452d7..746e24715 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1 +1,2 @@
 Bootstrap.bat text eol=crlf
+git-tags.txt export-subst
diff --git a/git-tags.txt b/git-tags.txt
new file mode 100644
index 000000000..d01155d63
--- /dev/null
+++ b/git-tags.txt
@@ -0,0 +1 @@
+$Format:%(describe:tags=true)$
\ No newline at end of file
diff --git a/premake5.lua b/premake5.lua
index b70f9b0b7..041c97865 100644
--- a/premake5.lua
+++ b/premake5.lua
@@ -192,6 +192,27 @@
 --    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 == "$Format:%(describe:tags=true)$" then
+			git_tag = nil
+		end
+		if git_tag and git_tag:startswith('v') then -- tags use v5.x.x-xxx format whereas premake uses 5.x.x-xxx
+			git_tag = git_tag:strsub(2)
+		end
+		print("Current git tag: ", git_tag)
+	end
+
 	solution "Premake5"
 		configurations { "Release", "Debug" }
 		location ( _OPTIONS["to"] )
@@ -278,6 +299,10 @@
 			"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" }
diff --git a/src/host/premake.h b/src/host/premake.h
index 62a9fbfa8..21170331f 100644
--- a/src/host/premake.h
+++ b/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"