From c89d0a0b73dfc82d918c326d89b141f8a2fc4de4 Mon Sep 17 00:00:00 2001
From: Jim Myhrberg <contact@jimeh.me>
Date: Thu, 10 Sep 2020 20:33:18 +0100
Subject: [PATCH] fix(internal): improve macOS version detection

Turns out that `sw_vers -productVersion` doesn't always return a version
string with a `MAJOR.MINOR.PATCH` format, but can also just return two
digits, like `11.0` on the current beta of macOS Big Sur.

Fixes: #13
---
 build-emacs-for-macos | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/build-emacs-for-macos b/build-emacs-for-macos
index a7e69f1..978e1e6 100755
--- a/build-emacs-for-macos
+++ b/build-emacs-for-macos
@@ -45,7 +45,7 @@ end
 class OSVersion
   def initialize
     @version = `sw_vers -productVersion`.match(
-      /(?<major>\d+)\.(?<minor>\d+)\.(?<patch>\d+)/
+      /(?<major>\d+)(?:\.(?<minor>\d+)(:?\.(?<patch>\d+))?)?/
     )
   end
 
@@ -54,15 +54,15 @@ class OSVersion
   end
 
   def major
-    @major ||= @version[:major].to_i
+    @major ||= @version[:major]&.to_i
   end
 
   def minor
-    @minor ||= @version[:minor].to_i
+    @minor ||= @version[:minor]&.to_i
   end
 
   def patch
-    @patch ||= @version[:patch].to_i
+    @patch ||= @version[:patch]&.to_i
   end
 end