Add tools command

bin/tools

@@ -0,0 +1,6 @@
+#!/usr/bin/env ruby
+
+require_relative "tools_lib/tools"
+
+tools = Tools.new
+tools.list_tools

bin/tools_lib/empty_file.rb

@@ -0,0 +1,5 @@
+class EmptyFile
+  def lines
+    []
+  end
+end

bin/tools_lib/tool_icons.rb

@@ -0,0 +1,15 @@
+module ToolIcons
+  TOOL_ICONS = {
+    "ruby" => "iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAAGFBMVEVHcEy/Qzm8QDW+Qje8QDW9QTa9QDa8QTZmAPnqAAAAB3RSTlMAJvFL33C/T+QPRAAAAF1JREFUeNrN0DkKwDAQBEHd/v+PDcIwhgLFmrQ62S03rbbnt1bPblFHzGI7GxWnwC10i7hru1hCtvgAt1LgKfRevvUU+KGIp9BTHJwCp8Apppoi7iZOgVPgFPgFewH6bQsqZElHlwAAAABJRU5ErkJggg==",
+
+    "elixir" => "iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAAGFBMVEVHcEx/Z916Ytl6Ydl6Ytp8ZNp7Ytp6Ytmj2hGuAAAAB3RSTlMAGeHBoT54bVkLIwAAAH1JREFUeNrNk0sOAzEMQuMv979x5V0njFGXfVsscIxybiqPwhKh9HJAOSSgBiwwxKo7MLjUh1L6vsTkK4vGF24cgAdhfIAnXtJgiNo24BxO4F0dr7QYuI6Ohd8dAq+EeuaQ66G4tNYGvAV3asG6LjSN/0RcXTLW4YBn2/kvPr/BC1y3ed4EAAAAAElFTkSuQmCC",
+
+    "python" => "iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAAMFBMVEVHcEyQo5pGjM5GispFisxEisxEiszWpirWpirYpyvWpirbqSzOpTNmkavXqCvYqitbyuh6AAAAEHRSTlMACEXg//f84f9c9B7Aw1Mxvf5QxwAAAIZJREFUeNq909EKhDAMRNG2aZvYrfr/f7srioNhloKg59ULGUTDy+IhcEnyQRINJJ8KDWoGeqXcDLCfncB+R81MJ78fqtpPi9jvqW0+mOfUUSCNB3VXpBsCbJi1GZCgG9BA/wd5FAgP8KKSbNt90JZwpQYr+/DUXX8g6G6/F1c9n0+jH+ddX6eCCwZdgedvAAAAAElFTkSuQmCC",
+
+    "nodejs" => "iVBORw0KGgoAAAANSUhEUgAAACAAAAAgAgMAAAAOFJJnAAAADFBMVEVHcExvuztvuDlvuTijLMEbAAAAA3RSTlMAQMCRa0lrAAAANklEQVR4AWMgErBNgDLyf0IF/v+HCOX///8TKgAUgghAhP6DAR0YcEvhzoA7DOFUhOMR3iEMAH4wa5VMF4BbAAAAAElFTkSuQmCC",
+  }.freeze
+
+  def tool_icon(tool)
+    "\e]1337;File=inline=1;height=1:#{TOOL_ICONS[tool]}\a"
+  end
+end

bin/tools_lib/tools.rb

@@ -0,0 +1,34 @@
+require_relative "tools_file"
+require_relative "tool_icons"
+
+class Tools
+  include ToolIcons
+
+  attr_reader :tools
+
+  def initialize
+    @tools = ToolsFile.new.tools
+  end
+
+  def list_tools
+    tools.each do |tool, version|
+      if available_tools.include? tool
+        puts "#{tool_icon(tool)}#{tool.ljust(max_length)} #{version}"
+      end
+    end
+  end
+
+  def max_length
+    @max_length ||= installed_tools.max do |a, b|
+      a.length <=> b.length
+    end.length
+  end
+
+  def installed_tools
+    tools.keys & available_tools
+  end
+
+  def available_tools
+    TOOL_ICONS.keys
+  end
+end

bin/tools_lib/tools_file.rb

@@ -0,0 +1,24 @@
+require_relative "empty_file"
+
+class ToolsFile
+  def initialize
+  end
+
+  def tools
+    @tools ||= format_tools
+  end
+
+  private
+
+  def format_tools
+    Hash[tools_file.lines.map do |tool|
+      tool.split
+    end]
+  end
+
+  def tools_file
+    File.read(".tool-versions")
+  rescue
+    EmptyFile.new
+  end
+end