ranger: add imagePreviewSupport option and make previews work out of the box

Before one had to turn it on manually and update the preview script in dotfiles
manually when ranger updates.

Now it requires zero configuration. Just run `ranger` and it works, and
should continue to work automagically when ranger updates.

Everything still can be (de)configured via `rc.conf` in dotfiles.

1 files changed, 17 insertions, 3 deletions

diff --git a/pkgs/applications/misc/ranger/default.nix b/pkgs/applications/misc/ranger/default.nix
index 1371646be273..92e017c3f28f 100644
--- a/pkgs/applications/misc/ranger/default.nix
+++ b/pkgs/applications/misc/ranger/default.nix
@@ -1,4 +1,9 @@
-{ stdenv, fetchurl, pythonPackages, w3m, file, less }:
+{ stdenv, fetchurl, pythonPackages, file, less
+, imagePreviewSupport ? true, w3m ? null}:
+
+with stdenv.lib;
+
+assert imagePreviewSupport -> w3m != null;
 
 pythonPackages.buildPythonApplication rec {
   name = "ranger-1.8.1";
@@ -23,14 +28,23 @@ pythonPackages.buildPythonApplication rec {
   '';
 
   preConfigure = ''
-    substituteInPlace ranger/ext/img_display.py \
-      --replace /usr/lib/w3m ${w3m}/libexec/w3m
     substituteInPlace ranger/__init__.py \
       --replace "DEFAULT_PAGER = 'less'" "DEFAULT_PAGER = '${stdenv.lib.getBin less}/bin/less'"
 
     for i in ranger/config/rc.conf doc/config/rc.conf ; do
       substituteInPlace $i --replace /usr/share $out/share
     done
+
+    # give file previews out of the box
+    substituteInPlace ranger/config/rc.conf \
+      --replace "set preview_script ~/.config/ranger/scope.sh" "set preview_script $out/share/doc/ranger/config/scope.sh"
+  '' + optionalString imagePreviewSupport ''
+    substituteInPlace ranger/ext/img_display.py \
+      --replace /usr/lib/w3m ${w3m}/libexec/w3m
+
+    # give image previews out of the box when building with w3m
+    substituteInPlace ranger/config/rc.conf \
+      --replace "set preview_images false" "set preview_images true" \
   '';
 
 }