1 files changed, 54 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/compilers/ghcjs/gen-stage2.rb b/nixpkgs/pkgs/development/compilers/ghcjs/gen-stage2.rb
new file mode 100755
index 000000000000..709e635db55c
--- /dev/null
+++ b/nixpkgs/pkgs/development/compilers/ghcjs/gen-stage2.rb
@@ -0,0 +1,54 @@
+#!/usr/bin/env ruby
+
+require 'pathname'
+
+# from boot.yaml in ghcjs/ghcjs
+stage2_packages = [
+  "boot/async",
+  "boot/aeson",
+  "boot/attoparsec",
+  "boot/case-insensitive",
+  "boot/dlist",
+  "boot/extensible-exceptions",
+  "boot/hashable",
+  "boot/mtl",
+  "boot/old-time",
+  "boot/parallel",
+  "boot/scientific",
+  "boot/stm",
+  "boot/syb",
+  "boot/text",
+  "boot/unordered-containers",
+  "boot/vector",
+  "ghcjs/ghcjs-base",
+  # not listed under stage2, but needed when "quick booting".
+  "boot/cabal/Cabal"
+]
+
+nixpkgs = File.expand_path("../../../../..", __FILE__)
+boot = ARGV[0] || `nix-build #{nixpkgs} -A haskell.packages.ghcjs.ghc.ghcjsBoot`.chomp
+
+out = "".dup
+out << "{ ghcjsBoot }: { callPackage }:\n"
+out << "\n"
+out << "{\n"
+
+stage2_packages.each do |package|
+  name = Pathname.new(package).basename
+  nix = `cabal2nix file://#{boot}/#{package}  --jailbreak`
+  nix.sub!(/src =.*?$/, "src = \"${ghcjsBoot}/#{package}\";")
+  nix.sub!("  doCheck = false;\n", "")
+  nix.sub!("libraryHaskellDepends", "doCheck = false;\n  libraryHaskellDepends")
+  # cabal2nix somehow generates the deps for 'text' as if it had selected flag
+  # 'integer-simple' (despite not passing the flag within the generated
+  # expression). We want integer-gmp instead.
+  nix.gsub!(/integer-simple/, "integer-gmp")
+  nix = nix.split("\n").join("\n      ")
+
+  out << "  #{name} = callPackage\n"
+  out << "    (#{nix}) {};\n"
+end
+
+out << "}"
+
+puts out