- Add completely install command

Author: DannyBen

.rubocop.yml

@@ -18,3 +18,8 @@ AllCops:
 Naming/AccessorMethodName:
   Exclude:
     - 'lib/completely/tester.rb'
+
+# The `bounce` method here is more readable without this cop
+Style/GuardClause:
+  Exclude:
+    - 'lib/completely/commands/install.rb'

lib/completely/cli.rb

@@ -1,9 +1,10 @@
 require 'mister_bin'
+require 'completely/version'
+require 'completely/commands/generate'
 require 'completely/commands/init'
+require 'completely/commands/install'
 require 'completely/commands/preview'
-require 'completely/commands/generate'
 require 'completely/commands/test'
-require 'completely/version'
 
 module Completely
   class CLI
@@ -16,6 +17,7 @@ def self.runner
       runner.route 'preview',   to: Commands::Preview
       runner.route 'generate',  to: Commands::Generate
       runner.route 'test',      to: Commands::Test
+      runner.route 'install',   to: Commands::Install
 
       runner
     end

lib/completely/commands/install.rb

@@ -0,0 +1,75 @@
+require 'completely/commands/base'
+
+module Completely
+  module Commands
+    class Install < Base
+      help 'Install a bash completion script'
+
+      usage 'completely install PROGRAM [SCRIPT_PATH --force]'
+      usage 'completely install (-h|--help)'
+
+      option '-f --force', 'Overwrite target file if it exists'
+
+      param 'PROGRAM', 'Name of the program the completions are for.'
+      param 'SCRIPT_PATH', 'Path to the source bash script [default: completely.bash].'
+
+      def run
+        bounce
+        success = system(*command)
+        raise "Failed running command:\nnb`#{command.join ' '}`" unless success
+
+        say "Saved m`#{target_path}`"
+      end
+
+    private
+
+      def bounce
+        unless completions_path
+          raise 'Cannot determine system completions directory'
+        end
+
+        unless File.exist? script_path
+          raise "Cannot find script: m`#{script_path}`"
+        end
+
+        if File.exist?(target_path) && !args['--force']
+          raise "File exists: m`#{target_path}`\nUse nb`--force` to overwrite"
+        end
+      end
+
+      def command
+        result = root? ? [] : %w[sudo]
+        result + %W[cp #{script_path} #{target_path}]
+      end
+
+      def script_path
+        args['SCRIPT_PATH'] || 'completely.bash'
+      end
+
+      def target_path
+        "#{completions_path}/#{args['PROGRAM']}"
+      end
+
+      def root?
+        Process.uid.zero?
+      end
+
+      def completions_path
+        @completions_path ||= completions_path!
+      end
+
+      def completions_path!
+        candidates = %w[
+          /usr/share/bash-completion/completions
+          /usr/local/etc/bash_completion.d
+        ]
+
+        candidates.each do |candidate|
+          return candidate if Dir.exist? candidate
+        end
+
+        nil
+      end
+    end
+  end
+end

spec/approvals/cli/commands

@@ -5,5 +5,6 @@ Commands:
   preview   Generate the bash completion script to STDOUT
   generate  Generate the bash completion script to a file
   test      Test completions
+  install   Install a bash completion script
 
 Run completely COMMAND --help for more information