guile-mqtt: new package 0.2.1

Formula/guile-mqtt.rb

@@ -0,0 +1,45 @@
+class GuileMqtt < Formula
+  desc "Guile bindings for libmosquitto MQTT client library"
+  homepage "https://github.com/mdjurfeldt/guile-mqtt"
+  url "https://github.com/mdjurfeldt/guile-mqtt/releases/download/v0.2.1/guile-mqtt-0.2.1.tar.gz"
+  sha256 "faa7eb530f32218f2239b1152db83a6ce7e240d4792e4c369fda0732bdc94399"
+
+  depends_on "pkg-config" => :build
+  depends_on "guile"
+  depends_on "mosquitto"
+
+  def install
+    ENV["GUILE_AUTO_COMPILE"] = "0"
+
+    # We need this so we can find other modules.
+    ENV["GUILE_LOAD_PATH"] = HOMEBREW_PREFIX/"share/guile/site/3.0"
+    ENV["GUILE_LOAD_COMPILED_PATH"] = HOMEBREW_PREFIX/"lib/guile/3.0/site-ccache"
+    ENV["GUILE_SYSTEM_EXTENSIONS_PATH"] = HOMEBREW_PREFIX/"lib/guile/3.0/extensions"
+
+    system "./configure", "--prefix=#{prefix}"
+    system "make", "install"
+  end
+
+  def caveats
+    <<~EOS
+      Remember to add the following to your .bashrc or equivalent in order to use this module:
+        export GUILE_LOAD_PATH="#{HOMEBREW_PREFIX}/share/guile/site/3.0"
+        export GUILE_LOAD_COMPILED_PATH="#{HOMEBREW_PREFIX}/lib/guile/3.0/site-ccache"
+        export GUILE_SYSTEM_EXTENSIONS_PATH="#{HOMEBREW_PREFIX}/lib/guile/3.0/extensions"
+    EOS
+  end
+
+  test do
+    mqtt = testpath/"mqtt.scm"
+    mqtt.write <<~EOS
+      (use-modules (mosquitto client))
+    EOS
+
+    ENV["GUILE_AUTO_COMPILE"] = "0"
+    ENV["GUILE_LOAD_PATH"] = HOMEBREW_PREFIX/"share/guile/site/3.0"
+    ENV["GUILE_LOAD_COMPILED_PATH"] = HOMEBREW_PREFIX/"lib/guile/3.0/site-ccache"
+    ENV["GUILE_SYSTEM_EXTENSIONS_PATH"] = HOMEBREW_PREFIX/"lib/guile/3.0/extensions"
+
+    system "guile", mqtt
+  end
+end