dwm-git: init at 20180602 (#45716)

The latest tagged release dwm 6.1 is from 2015, so
the development version is much more current.

pkgs/applications/window-managers/dwm/git.nix

···
+{ stdenv, fetchgit, libX11, libXinerama, libXft, patches ? [], conf ? null }:
+
+let
+  name = "dwm-git-20180602";
+in
+
+stdenv.mkDerivation {
+  inherit name;
+
+  src = fetchgit {
+    url = "git://git.suckless.org/dwm";
+    rev = "b69c870a3076d78ab595ed1cd4b41cf6b03b2610";
+    sha256 = "10i079h79l4gdch1qy2vrrb2xxxkgkjmgphr5r9a75jbbagwvz0k";
+  };
+
+  buildInputs = [ libX11 libXinerama libXft ];
+
+  prePatch = ''sed -i "s@/usr/local@$out@" config.mk'';
+
+  # Allow users set their own list of patches
+  inherit patches;
+
+  # Allow users to override the entire config file AFTER appying the patches
+  postPatch = stdenv.lib.optionalString (conf!=null) ''
+    echo -n '${conf}' > config.def.h
+  '';
+
+  buildPhase = "make";
+
+  meta = with stdenv.lib; {
+    homepage = https://suckless.org/;
+    description = "Dynamic window manager for X, development version";
+    license = licenses.mit;
+    maintainers = with maintainers; [xeji];
+    platforms = platforms.unix;
+  };
+}

pkgs/top-level/all-packages.nix

···
     patches = config.dwm.patches or [];
   };
 
+  dwm-git = callPackage ../applications/window-managers/dwm/git.nix {
+    patches = config.dwm.patches or [];
+    conf = config.dwm.conf or null;
+  };
+
   dwm-status = callPackage ../applications/window-managers/dwm/dwm-status.nix { };
 
   dynamips = callPackage ../applications/virtualization/dynamips { };