Merge pull request #78 from sj26/cli-open-command

Second iteration of a `gel open [gem-name]` CLI command

lib/gel/command.rb

@@ -84,3 +84,4 @@ def self.extract_word(arguments)
 require_relative "command/stub"
 require_relative "command/config"
 require_relative "command/shell_setup"
+require_relative "command/open"

lib/gel/command/open.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class Gel::Command::Open < Gel::Command
+  def run(command_line)
+    require "shellwords"
+
+    raise "Please provide the name of a gem to open in your editor" if command_line.empty?
+    raise "Too many arguments, only 1 gem name is supported" if command_line.length > 1
+    gem_name = command_line.shift
+
+    editor = ENV.fetch("GEL_EDITOR", ENV["EDITOR"])
+    raise "An editor must be set using either $GEL_EDITOR or $EDITOR" unless editor
+
+    Gel::Environment.activate(output: $stderr)
+
+    found_gem = Gel::Environment.find_gem(gem_name)
+    raise "Can't find gem `#{gem_name}`" unless found_gem
+
+    command = [*Shellwords.split(editor), found_gem.root]
+    Dir.chdir(found_gem.root) do
+      exec(*command)
+    end
+  end
+end