bgnet: 3.0.21 -> 3.1.2

Also builds from source now, the old tarball was long gone.

pkgs/data/documentation/bgnet/default.nix

···
-{ stdenv, lib, fetchurl, python, zip, fop }:
+{ stdenv, lib, fetchFromGitHub, python3, pandoc }:
 
 stdenv.mkDerivation {
   pname = "bgnet";
-  version = "3.0.21";
+  # to be found in the Makefile
+  version = "3.1.2";
 
-  src = fetchurl {
-    url = "https://beej.us/guide/bgnet/bgnet.tgz";
-    sha256 = "00ggr5prc5i3w9gaaw2sadfq6haq7lmh0vdilaxx8xz9z5znxvyv";
+  src = fetchFromGitHub {
+    owner = "beejjorgensen";
+    repo = "bgnet";
+    rev = "782a785a35d43c355951b8151628d7c64e4d0346";
+    sha256 = "19w0r3zr71ydd29amqwn8q3npgrpy5kkshyshyji2hw5hky6iy92";
   };
 
-  buildInputs = [ python zip fop ];
+  buildPhase = ''
+    # build scripts need some love
+    patchShebangs bin/preproc
 
-  preBuild = ''
-    sed -i "s/#disable=1/disable=1/" bin/bgvalidate
-    # build scripts need some love
-    patchShebangs .
+    make -C src bgnet.html
   '';
 
   installPhase = ''
-    mkdir -p $out
-    mv * $out/
+    install -Dm644 src/bgnet.html $out/share/doc/bgnet/html/index.html
   '';
+
+  nativeBuildInputs = [ python3 pandoc ];
 
   meta = {
     description = "Beej’s Guide to Network Programming";