irssi: backport patches for Apple silicon

Formula/irssi.rb

@@ -1,10 +1,32 @@
 class Irssi < Formula
   desc "Modular IRC client"
   homepage "https://irssi.org/"
-  url "https://github.com/irssi/irssi/releases/download/1.2.2/irssi-1.2.2.tar.xz"
-  sha256 "6727060c918568ba2ff4295ad736128dba0b995d7b20491bca11f593bd857578"
   license "GPL-2.0"
-  revision 1
+  revision 2
+
+  stable do
+    # We can switch back to a tarball after the next release;
+    # irssi's autogen refuses to work from a tarball
+    url "https://github.com/irssi/irssi.git",
+        tag:      "1.2.2",
+        revision: "42110b92e92cb40e82fd736d88b099d096483939"
+
+    # Backports an upstream patch which disables some autoconf behaviour;
+    # prerequisite for the next patch to work.
+    # https://github.com/irssi/irssi/pull/1268
+    patch do
+      url "https://github.com/Homebrew/formula-patches/raw/467f95fcd0438b5f7a88ae0c406a8f73bc93b501/irssi/nostdinc.diff"
+      sha256 "00a7fe5e796ec3e37d629e0484f08f23b0fa33a428088d120ac0d8283054449c"
+    end
+
+    # Backports a patch which adjusts how irssi uses curses headers,
+    # required for it to work properly on Apple silicon.
+    # https://github.com/irssi/irssi/pull/1290
+    patch do
+      url "https://github.com/Homebrew/formula-patches/raw/467f95fcd0438b5f7a88ae0c406a8f73bc93b501/irssi/curses_check.patch"
+      sha256 "a505394680e518712e9d0ab0ff14622d34b633b8310dbbfa42b5ad1df7fd3050"
+    end
+  end
 
   livecheck do
     url "https://irssi.org/download/"
@@ -29,6 +51,11 @@ class Irssi < Formula
     depends_on "lynx" => :build
   end
 
+  # Needed while we're regenerating configure due to the patch
+  depends_on "autoconf" => :build
+  depends_on "automake" => :build
+  depends_on "libtool" => :build
+
   depends_on "pkg-config" => :build
   depends_on "glib"
   depends_on "openssl@1.1"
@@ -58,10 +85,10 @@ class Irssi < Formula
       args << "--with-ncurses=#{Formula["ncurses"].prefix}"
     end
 
-    if build.head?
+    # Restore this to an `if build.head?` conditional
-      ENV["NOCONFIGURE"] = "yes"
+    # once we no longer need the patch
-      system "./autogen.sh", *args
+    ENV["NOCONFIGURE"] = "yes"
-    end
+    system "./autogen.sh", *args
 
     system "./configure", *args
     # "make" and "make install" must be done separately on some systems