add -G option

lib/colorls/flags.rb

@@ -151,6 +151,7 @@ module ColorLS
         @opts[:mode] = :long
         @opts[:show_user] = false
       end
+      options.on('-G', '--no-group', 'show no group information in a long listing') { @opts[:show_group] = false }
     end
 
     def add_general_options(options)

man/colorls.1

@@ -79,6 +79,10 @@ use a long listing format without group information
 use a long listing format without owner information
 .
 .TP
+\fB\-G\fR, \fB\-\-no\-group\fR
+show no group information in a long listing
+.
+.TP
 \fB\-\-sd\fR, \fB\-\-sort\-dirs\fR, \fB\-\-group\-directories\-first\fR
 sort directories first
 .

spec/color_ls/flags_spec.rb

@@ -439,4 +439,42 @@ RSpec.describe ColorLS::Flags do
       expect { subject }.not_to output(/user/).to_stdout
     end
   end
+
+  context 'with -G flag in a listing format' do
+    let(:args) { ['-l', '-G', "#{FIXTURES}/a.txt"] }
+
+    before do
+      fileInfo = instance_double(
+        'FileInfo',
+        :group => "sys",
+        :mtime => Time.now,
+        :directory? => false,
+        :owner => "user",
+        :name => "a.txt",
+        :show => "a.txt",
+        :nlink => 1,
+        :size => 128,
+        :blockdev? => false,
+        :chardev? => false,
+        :socket? => false,
+        :symlink? => false,
+        :stats => OpenStruct.new(
+          mode: 0o444, # read for user, owner, other
+          setuid?: true,
+          setgid?: true,
+          sticky?: true
+        ),
+        :executable? => false
+      )
+
+      allow(ColorLS::FileInfo).to receive(:new).with("#{FIXTURES}/a.txt", link_info: true) { fileInfo }
+    end
+
+    it 'lists without group info' do
+      expect { subject }.not_to output(/sys/).to_stdout
+    end
+    it 'lists without user info' do
+      expect { subject }.to output(/user/).to_stdout
+    end
+  end
 end

zsh/_colorls

@@ -24,6 +24,8 @@ _arguments -s -S \
   "--long[use a long listing format]" \
   "-o[use a long listing format without group information]" \
   "-g[use a long listing format without owner information]" \
+  "-G[show no group information in a long listing]" \
+  "--no-group[show no group information in a long listing]" \
   "--sd[sort directories first]" \
   "--sort-dirs[sort directories first]" \
   "--group-directories-first[sort directories first]" \