lfe: init at 1.1.1 (#16865)

This is a first pass at adding an LFE package.

N.B. man pages are ignored for now.

pkgs/development/interpreters/lfe/default.nix

@@ -0,0 +1,62 @@
+{ stdenv, fetchFromGitHub, erlang, makeWrapper, coreutils, bash }:
+
+stdenv.mkDerivation rec {
+  name    = "lfe-${version}";
+  version = "1.1.1";
+
+  src = fetchFromGitHub {
+    owner  = "rvirding";
+    repo   = "lfe";
+    rev    = version;
+    sha256 = "0w1vpjqj8ni43gi84i0mcml4gfaqhmmd9s46di37cngpdw86i3bz";
+  };
+
+  buildInputs = [ erlang makeWrapper ];
+
+  setupHook   = ./setup-hook.sh;
+
+  # These installPhase tricks are based on Elixir's Makefile.
+  # TODO: Make, upload, and apply a patch.
+  installPhase = ''
+    local libdir=$out/lib/lfe
+    local ebindir=$libdir/ebin
+    local bindir=$libdir/bin
+
+    rm -Rf $ebindir
+    install -m755 -d $ebindir
+    install -m644 ebin/* $ebindir
+
+    install -m755 -d $bindir
+    for bin in bin/lfe{,c,doc,script}; do install -m755 $bin $bindir; done
+
+    install -m755 -d $out/bin
+    for file in $bindir/*; do ln -sf $file $out/bin/; done
+  '';
+
+  # Thanks again, Elixir.
+  postFixup = ''
+    # LFE binaries are shell scripts which run erl and lfe.
+    # Add some stuff to PATH so the scripts can run without problems.
+    for f in $out/bin/*; do
+      wrapProgram $f \
+        --prefix PATH ":" "${erlang}/bin:${coreutils}/bin:${bash}/bin:$out/bin"
+      substituteInPlace $f --replace "/usr/bin/env" "${coreutils}/bin/env"
+    done
+  '';
+
+  meta = with stdenv.lib; {
+    description     = "The best of Erlang and of Lisp; at the same time!";
+    longDescription = ''
+      LFE, Lisp Flavoured Erlang, is a lisp syntax front-end to the Erlang
+      compiler. Code produced with it is compatible with "normal" Erlang
+      code. An LFE evaluator and shell is also included.
+    '';
+
+    homepage     = "http://lfe.io";
+    downloadPage = "https://github.com/rvirding/lfe/releases";
+
+    license      = licenses.asl20;
+    maintainers  = with maintainers; [ yurrriq ];
+    platforms    = platforms.unix;
+  };
+}

pkgs/development/interpreters/lfe/setup-hook.sh

@@ -0,0 +1,5 @@
+addLfeLibPath() {
+    addToSearchPath ERL_LIBS $1/lib/lfe/lib
+}
+
+envHooks+=(addLfeLibPath)