rufo: init at 0.12.0

Signed-off-by: Anders Kaseorg <[e-mail]>

pkgs/development/tools/rufo/Gemfile

···
+source 'https://rubygems.org'
+
+gem 'rufo'

pkgs/development/tools/rufo/Gemfile.lock

···
+GEM
+  remote: https://rubygems.org/
+  specs:
+    rufo (0.12.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rufo
+
+BUNDLED WITH
+   2.1.4

pkgs/development/tools/rufo/default.nix

···
+{ bundlerApp, bundlerUpdateScript, lib }:
+
+bundlerApp {
+  pname = "rufo";
+  gemdir = ./.;
+  exes = [ "rufo" ];
+
+  passthru.updateScript = bundlerUpdateScript "rufo";
+
+  meta = with lib; {
+    description = "Ruby formatter";
+    homepage = "https://github.com/ruby-formatter/rufo";
+    license = licenses.mit;
+    maintainers = with maintainers; [ andersk ];
+  };
+}

pkgs/development/tools/rufo/gemset.nix

···
+{
+  rufo = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0nwasskcm0nrf7f52019x4fvxa5zckj4fcvf4cdl0qflrcwb1l9f";
+      type = "gem";
+    };
+    version = "0.12.0";
+  };
+}

pkgs/top-level/all-packages.nix

···
   rr = callPackage ../development/tools/analysis/rr { };
   rr-unstable = callPackage ../development/tools/analysis/rr/unstable.nix { }; # This is a temporary attribute, please see the corresponding file for details.
 
+  rufo = callPackage ../development/tools/rufo { };
+
   samurai = callPackage ../development/tools/build-managers/samurai { };
 
   saleae-logic = callPackage ../development/tools/misc/saleae-logic { };