From 18218ed3803b21242ea1746676c5ec2be9f10199 Mon Sep 17 00:00:00 2001
From: Akira Komamura <akira.komamura@gmail.com>
Date: Sun, 15 Oct 2023 12:51:30 +0900
Subject: [PATCH] Put the Emacs versions provided from the actual executables

---
 flake.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/flake.nix b/flake.nix
index be61a5b..133092e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -49,9 +49,13 @@
             name = "${emacsName}.nix";
             path =
               pkgs.runCommand "build-${emacsName}-builtins-nix" {
+                buildInputs = [emacsPackage];
               } ''
+                EMACS_VERSION="$(emacs --version \
+                  | grep -F "GNU Emacs" \
+                  | grep -oE "[[:digit:]]+(:?\.[[:digit:]]+)+")"
                 echo >>$out '{'
-                echo >>$out '  version = "${emacsPackage.version}";'
+                echo >>$out '  version = "''${EMACS_VERSION}";'
                 echo >>$out '  libraries = ['
                 sed -e 's/^/"/' -e 's/$/"/' ${(pkgs.emacsTwist {
                     inherit emacsPackage;