data/fonts: simpler cleanups

pkgs/data/fonts/theano/default.nix

@@ -1,24 +1,21 @@
 { stdenv, fetchzip }:
 
-stdenv.mkDerivation rec {
-  name = "theano-${version}";
+let
   version = "2.0";
+in fetchzip rec {
+  name = "theano-${version}";
 
-  src = fetchzip {
-    stripRoot = false;
-    url = "https://github.com/akryukov/theano/releases/download/v${version}/theano-${version}.otf.zip";
-    sha256 = "1z3c63rcp4vfjyfv8xwc3br10ydwjyac3ipbl09y01s7qhfz02gp";
-  };
+  url = "https://github.com/akryukov/theano/releases/download/v${version}/theano-${version}.otf.zip";
 
-  phases = [ "unpackPhase" "installPhase" ];
-
-  installPhase = ''
+  postFetch = ''
     mkdir -p $out/share/fonts/opentype
     mkdir -p $out/share/doc/${name}
-    find . -name "*.otf" -exec cp -v {} $out/share/fonts/opentype \;
-    find . -name "*.txt" -exec cp -v {} $out/share/doc/${name} \;
+    unzip -j $downloadedFile \*.otf -d $out/share/fonts/opentype
+    unzip -j $downloadedFile \*.txt -d "$out/share/doc/${name}"
   '';
 
+  sha256 = "1my1symb7k80ys33iphsxvmf6432wx6vjdnxhzhkgrang1rhx1h8";
+
   meta = with stdenv.lib; {
     homepage = https://github.com/akryukov/theano;
     description = "An old-style font designed from historic samples";