CLI - Fetch

Add `fetch` command to cli like suggestion at the end of Homebrew#2528

USAGE.md

@@ -70,6 +70,7 @@ This will both uninstall the Cask and remove symlinks which were created in
 
 * `info` -- displays information about the given Cask
 * `list` -- with no args, lists installed Casks; given installed Casks, lists installed files
+* `fetch` -- downloads Cask resources to local cache (with `--force`, re-download even if already cached)
 * `doctor` -- checks for configuration issues
 * `cleanup` -- cleans up cached downloads (with `--outdated`, only cleans old downloads)
 * `home` -- opens the homepage of the given Cask; or with no arguments, the homebrew-cask project page

doc/src/brew-cask.1.md

@@ -60,7 +60,15 @@ names, and other aspects of this manual are still subject to change.
   * `edit` <Cask>:
     Open the given Caskfile for editing.
 
+<<<<<<< HEAD
   * `home` or `homepage`:
+=======
+  * `fetch` <Cask> [--force]:
+    Fetch remote resources for the given Cask to the local cache.  With
+    `--force`, force re-download even if the resources are already cached.
+
+  * `home`:
+>>>>>>> CLI - Fetch
     Open the project page <http://caskroom.io> in a browser.
 
   * `info` or `abv` <Cask>:

lib/cask/cli.rb

@@ -10,6 +10,7 @@ class Cask::CLI; end
 require 'cask/cli/create'
 require 'cask/cli/doctor'
 require 'cask/cli/edit'
+require 'cask/cli/fetch'
 require 'cask/cli/home'
 require 'cask/cli/info'
 require 'cask/cli/install'

lib/cask/cli/fetch.rb

@@ -0,0 +1,18 @@
+class Cask::CLI::Fetch
+  def self.run(*args)
+    raise CaskUnspecifiedError if args.empty?
+    cask_names = args.reject { |a| a.chars.first == '-' }
+    force = args.include? '--force'
+
+    cask_names.each do |cask_name|
+      ohai "Fetching resources for Cask #{cask_name}"
+      cask = Cask.load(cask_name)
+      @downloaded_path = Cask::Download.new(cask).perform force
+      ohai "Success! Downloaded to -> #{@downloaded_path}"
+    end
+  end
+
+  def self.help
+    "downloads Cask resources to local cache"
+  end
+end

lib/cask/download.rb

@@ -5,14 +5,15 @@ def initialize(cask)
     @cask = cask
   end
 
-  def perform
+  def perform(force=false)
     require 'software_spec'
     cask = @cask
     if cask.url.using == :svn
       downloader = Cask::SubversionDownloadStrategy.new(cask)
     else
       downloader = Cask::CurlDownloadStrategy.new(cask)
     end
+    downloader.clear_cache if force
     downloaded_path = downloader.fetch
     begin
       # this symlink helps track which downloads are ours

test/cask/cli/fetch_test.rb

@@ -0,0 +1,71 @@
+require 'test_helper'
+
+describe Cask::CLI::Fetch do
+  let(:local_transmission) do
+    Cask.load('local-transmission')
+  end
+
+  let(:local_caffeine) do
+    Cask.load('local-caffeine')
+  end
+
+  it "allows download the installer of a cask" do
+    shutup do
+      Cask::CLI::Fetch.run('local-transmission', 'local-caffeine')
+    end
+    Cask::CurlDownloadStrategy.new(local_transmission).cached_location.must_be :exist?
+    Cask::CurlDownloadStrategy.new(local_caffeine).cached_location.must_be :exist?
+  end
+
+  it "prevents double fetch (without nuking existing installation)" do
+    download_stategy = Cask::CurlDownloadStrategy.new(local_transmission)
+
+    shutup do
+      Cask::Download.new(local_transmission).perform
+    end
+    old_ctime = File.stat(download_stategy.cached_location).ctime
+
+    shutup do
+      Cask::CLI::Fetch.run('local-transmission')
+    end
+    new_ctime = File.stat(download_stategy.cached_location).ctime
+
+    old_ctime.to_i.must_equal new_ctime.to_i
+
+  end
+
+  it "allows double fetch with --force" do
+    shutup do
+      Cask::Download.new(local_transmission).perform
+    end
+
+    download_stategy = Cask::CurlDownloadStrategy.new(local_transmission)
+    old_ctime = File.stat(download_stategy.cached_location).ctime
+    sleep(1)
+
+    shutup do
+      Cask::CLI::Fetch.run('local-transmission','--force')
+    end
+    download_stategy = Cask::CurlDownloadStrategy.new(local_transmission)
+    new_ctime = File.stat(download_stategy.cached_location).ctime
+
+    # new_ctime.to_i.must_be :>, old_ctime.to_i
+    new_ctime.to_i.must_be :>, old_ctime.to_i
+  end
+
+  it "properly handles casks that are not present" do
+    lambda {
+      shutup do
+        Cask::CLI::Fetch.run('notacask')
+      end
+    }.must_raise CaskUnavailableError
+  end
+
+  it "raises an exception when no cask is specified" do
+    lambda {
+      shutup do
+        Cask::CLI::Fetch.run
+      end
+    }.must_raise CaskUnspecifiedError
+  end
+end