Support -g instead of --grep

Author: k0kubun

lib/irb/cmd/ls.rb

@@ -10,7 +10,7 @@ module IRB
   module ExtendCommand
     class Ls < Nop
       def self.transform_args(args)
-        if match = args&.match(/\A(?<args>.+\s|)(--grep|-G)\s+(?<grep>[^\s]+)\s*\n\z/)
+        if match = args&.match(/\A(?<args>.+\s|)(-g|-G)\s+(?<grep>[^\s]+)\s*\n\z/)
           args = match[:args]
           "#{args}#{',' unless args.chomp.empty?} grep: /#{match[:grep]}/"
         else

test/irb/test_cmd.rb

@@ -489,7 +489,7 @@ def test_ls_grep
 
       [
         "ls 42, grep: /times/\n",
-        "ls 42 --grep times\n",
+        "ls 42 -g times\n",
         "ls 42 -G times\n",
       ].each do |line|
         out, err = execute_lines(line)
@@ -508,7 +508,7 @@ def test_ls_grep_empty
 
       [
         "ls grep: /whereami/\n",
-        "ls --grep whereami\n",
+        "ls -g whereami\n",
         "ls -G whereami\n",
       ].each do |line|
         out, err = execute_lines(line)