add papertrail at 0.10.1

Thank you @grahamc <3

pkgs/tools/text/papertrail/Gemfile

···
+# frozen_string_literal: true
+source "https://rubygems.org"
+
+gem "papertrail"

pkgs/tools/text/papertrail/Gemfile.lock

···
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ansi (1.5.0)
+    chronic (0.10.2)
+    papertrail (0.10.1)
+      ansi (~> 1.5)
+      chronic (~> 0.10)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  papertrail
+
+BUNDLED WITH
+   1.14.4

pkgs/tools/text/papertrail/default.nix

···
+{ stdenv, bundlerEnv, ruby}:
+
+let
+  # To update, just run `nix-shell` in this directory.
+  papertrail-env = bundlerEnv rec {
+    name = "papertrail-env";
+    inherit ruby;
+    gemfile = ./Gemfile;
+    lockfile = ./Gemfile.lock;
+    gemset = ./gemset.nix;
+  };
+in stdenv.mkDerivation {
+  name = "papertrail-${(import ./gemset.nix).papertrail.version}";
+
+  phases = [ "installPhase" ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    ln -s ${papertrail-env}/bin/papertrail $out/bin/papertrail
+  '';
+}

pkgs/tools/text/papertrail/gemset.nix

···
+{
+  ansi = {
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "14ims9zfal4gs2wpx2m5rd8zsrl2k794d359shkrsgg3fhr2a22l";
+      type = "gem";
+    };
+    version = "1.5.0";
+  };
+  chronic = {
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1hrdkn4g8x7dlzxwb1rfgr8kw3bp4ywg5l4y4i9c2g5cwv62yvvn";
+      type = "gem";
+    };
+    version = "0.10.2";
+  };
+  papertrail = {
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0vb7bh7qh5hr4v3w711bl0yrr3rlhz5c3h3qx3fq31dr5y4100v7";
+      type = "gem";
+    };
+    version = "0.10.1";
+  };
+}

pkgs/tools/text/papertrail/shell.nix

···
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.stdenv.mkDerivation {
+  name = "papertrail";
+  src = ./.;
+
+  buildInputs = with pkgs; [
+    bundix
+    bundler
+    ruby
+  ];
+
+  shellHook = ''
+    truncate --size 0 Gemfile.lock
+    bundle install --path=vendor/bundle
+    rm -rf vendor .bundle
+    bundix
+  '';
+}

pkgs/top-level/all-packages.nix

···
   paper-gtk-theme = callPackage ../misc/themes/paper { };
 
   paperwork = callPackage ../applications/office/paperwork { };
+ 
+  papertrail = callPackage ../tools/text/papertrail { };
 
   par2cmdline = callPackage ../tools/networking/par2cmdline { };