Add file path source option (`--file`) to plugin installation

Convenience option for installing plugins from a local repository, using the local path:

    bundle plugin install --file /path/to/bundler-dependency_graph bundler-dependency_graph

3 files changed, 26 insertions, 1 deletions

diff --git a/lib/bundler/cli/plugin.rb b/lib/bundler/cli/plugin.rb
index 92d4653bda..ea50199843 100644
--- a/lib/bundler/cli/plugin.rb
+++ b/lib/bundler/cli/plugin.rb
@@ -5,7 +5,13 @@ module Bundler
   class CLI::Plugin < Thor
     desc "install PLUGINS", "Install the plugin from the source"
     long_desc <<-D
-      Install plugins either from the rubygems source provided (with --source option) or from a git source provided with (--git option). If no sources are provided, it uses Gem.sources
+      Install plugins from any of the sources provided:
+
+      - from rubygems (`--source` option)
+      - from a remote git source (`--git` option)
+      - from a local git repo (`--file /path/to/repo` option)
+
+      If no sources are provided, it uses Gem.sources.
    D
     method_option "source", :type => :string, :default => nil, :banner =>
       "URL of the RubyGems source to fetch the plugin from"
@@ -13,6 +19,8 @@ module Bundler
       "The version of the plugin to fetch"
     method_option "git", :type => :string, :default => nil, :banner =>
       "URL of the git repo to fetch from"
+    method_option "file", :type => :string, :default => nil, :banner =>
+      "Path of the local git repo to fetch from"
     method_option "branch", :type => :string, :default => nil, :banner =>
       "The git branch to checkout"
     method_option "ref", :type => :string, :default => nil, :banner =>
diff --git a/lib/bundler/plugin/installer.rb b/lib/bundler/plugin/installer.rb
index 6c8744c2f4..9536ca3f1d 100644
--- a/lib/bundler/plugin/installer.rb
+++ b/lib/bundler/plugin/installer.rb
@@ -40,6 +40,7 @@ module Bundler
         sources = {}
 
         sources[:git] = options.delete(:git) if options[:git]
+        sources[:file] = options.delete(:file) if options[:file]
         sources[:source] = options.delete(:source) if options[:source]
 
         sources
@@ -52,6 +53,11 @@ module Bundler
           source_list.add_git_source(options.merge("uri" => sources[:git]))
         end
 
+        if sources[:file]
+          file_uri = "file://#{URI.escape(sources[:file])}"
+          source_list.add_git_source(options.merge("uri" => file_uri))
+        end
+
         if sources[:source]
           source_list.add_rubygems_source("remotes" => sources[:source])
         end
diff --git a/spec/plugins/install_spec.rb b/spec/plugins/install_spec.rb
index 9304d78062..7c0212ed76 100644
--- a/spec/plugins/install_spec.rb
+++ b/spec/plugins/install_spec.rb
@@ -122,6 +122,17 @@ RSpec.describe "bundler plugin install" do
       expect(out).to include("Installed plugin foo")
       plugin_should_be_installed("foo")
     end
+
+    it "installs form a local git source" do
+      build_git "foo" do |s|
+        s.write "plugins.rb"
+      end
+
+      bundle "plugin install foo --file #{lib_path("foo-1.0")}"
+
+      expect(out).to include("Installed plugin foo")
+      plugin_should_be_installed("foo")
+    end
   end
 
   context "Gemfile eval" do