From dbbf9e7190beac15b44f679a97f90694ac69238c Mon Sep 17 00:00:00 2001
From: Tan Le <numbat@fastmail.com>
Date: Fri, 23 Aug 2024 11:58:31 +1000
Subject: [PATCH] Handle `else if` statement in makefile

---
 lib/rouge/lexers/make.rb | 4 ++++
 spec/visual/samples/make | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/lib/rouge/lexers/make.rb b/lib/rouge/lexers/make.rb
index 7320632ecf..3b7338325c 100644
--- a/lib/rouge/lexers/make.rb
+++ b/lib/rouge/lexers/make.rb
@@ -40,6 +40,10 @@ def initialize(opts={})
           groups Keyword, Text, Name::Variable
         end
 
+        rule %r/(else\b)([\t ]+)((?:ifn?def|ifn?eq)\b)([\t ]+)([^#\n]+)/ do
+          groups Keyword, Text, Keyword, Text, Name::Variable
+        end
+
         rule %r/(?:else|endif|endef|endfor)[\t ]*(?=[#\n])/, Keyword
 
         rule %r/(export)([\t ]+)(?=[\w\${}()\t -]+\n)/ do
diff --git a/spec/visual/samples/make b/spec/visual/samples/make
index c6a0aef84f..4581a31ba2 100644
--- a/spec/visual/samples/make
+++ b/spec/visual/samples/make
@@ -92,6 +92,14 @@ else
 THING2 = default
 endif
 
+ifeq ($(OS), Linux)
+MES = "Hi, Linux"
+else ifeq ($(OS), Darwin)
+MES = "Hi, Mac"
+else
+MES = "Unknown"
+endif
+
 ifeq ($(TARGET),special) # syntax variant: parentheses and separating comma
 TARGET = something_else
 else