Refactor `--rules` CLI switch output

src/ameba/cli/cmd.cr

@@ -5,6 +5,9 @@ require "option_parser"
 module Ameba::Cli
   extend self
 
+  private ENABLED_MARK  = "✓".colorize(:green)
+  private DISABLED_MARK = "x".colorize(:red)
+
   def run(args = ARGV)
     opts = parse_args args
     location_to_explain = opts.location_to_explain
@@ -184,13 +187,34 @@ module Ameba::Cli
   end
 
   private def print_rules(config)
-    config.rules.each do |rule|
-      puts "%s [%s] - %s" % {
-        rule.name.colorize(:white),
-        rule.severity.symbol.to_s.colorize(:green),
-        rule.description.colorize(:dark_gray),
+    rules = config.rules.to_h do |rule|
+      name = rule.name.split('/')
+      name = "%s/%s" % {
+        name[0...-1].join('/').colorize(:light_gray),
+        name.last.colorize(:white),
       }
+      {name, rule}
     end
+    longest_name = rules.max_of(&.first.size)
+
+    rules.group_by(&.last.group).each do |group, group_rules|
+      puts "— %s" % group.colorize(:light_blue).underline
+      puts
+      group_rules.each do |name, rule|
+        puts "  %s  [%s]    %s    %s" % {
+          rule.enabled? ? ENABLED_MARK : DISABLED_MARK,
+          rule.severity.symbol.to_s.colorize(:green),
+          name.ljust(longest_name),
+          rule.description.colorize(:dark_gray),
+        }
+      end
+      puts
+    end
+
+    puts "Total rules: %s / %s enabled" % {
+      rules.size.to_s.colorize(:light_blue),
+      rules.count(&.last.enabled?).to_s.colorize(:light_blue),
+    }
     exit 0
   end
 end