Option to install from slate dev branch

Author: kjg

README.md

@@ -38,7 +38,8 @@ Slate Installer commands:
   slate-installer install         # creates a docs folder and installs latest slate into it
 
 Options:
-  -l, [--logo=LOGO]  # path to custom logo file
+  -l, [--logo=LOGO]        # path to custom logo file
+  -d, [--dev], [--no-dev]  # install from the slate dev branch
 
 Runtime options:
   -f, [--force]                    # Overwrite files that already exist
@@ -61,6 +62,12 @@ You can optionally specify the path to a custom logo to have that overwrite the
   $ slate-installer install -l path/to/logo.png
 ```
 
+You can optionally install slate from its dev branch instead of master with the `-d` option
+
+```shell
+  $ slate-installer install -d
+```
+
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.

lib/slate/installer/cli.rb

@@ -17,13 +17,20 @@ def self.source_paths
 
       desc "install", "creates a docs folder and installs latest slate into it"
       method_option :logo, :type => :string, :aliases => "-l", :desc => "path to custom logo file", :lazy_default => ""
+      method_option :dev, :type => :boolean, :aliases => "-d", :desc => "install from the slate dev branch"
       def install
         if options[:logo]
           logo = determine_logo_path(options[:logo])
         end
 
         Dir.mktmpdir("slate-src-") do |tmpdir|
-          output, _status = Open3.capture2e("git", "clone", "--depth", "1", "--progress", "https://github.com/lord/slate.git",  tmpdir)
+          branch = if options[:dev]
+            "dev"
+          else
+            "master"
+          end
+
+          output, _status = Open3.capture2e("git", "clone", "--depth", "1", "--branch", branch, "--progress", "https://github.com/lord/slate.git",  tmpdir)
           puts output
 
           if logo