add ,env script to parse and export environment variables

,env

@@ -0,0 +1,68 @@
+#!/usr/bin/env ruby
+
+help = %[
+,env [OPTIONS] [file]
+
+Show all environment variables in .env file. Not touching shell.
+
+Please execute "eval $(,env)" if you what export to shell.
+
+OPTIONS
+
+-h --help
+  print help info
+
+--unset
+  unset all environments in target file
+
+file
+  default is .env
+]
+
+file = ".env"
+is_unset = false
+
+for arg in ARGV
+  case arg
+  when "-h", "--help"
+    puts help
+    exit
+  when "--unset"
+    is_unset = true
+  else
+    file = arg
+    end
+end
+
+unless File.exist? file
+  puts "#{file} not exists"
+  exit 1
+end
+
+def simple_parse_env(line)
+  line = line.strip
+  return [nil, nil] if line.empty? || line.start_with?('#')
+
+  key, value = line.split('=', 2)
+  return [nil, nil] unless value # 如果没有等号则忽略
+
+  value = value.split('#', 2).first.strip
+
+  value = value.gsub(/\A['"]|['"]\z/, '')
+
+  [key.strip, value]
+end
+
+File.foreach(file) do |line|
+  unless line.start_with? "#"
+    key, value = simple_parse_env(line)
+    if key and value
+      if is_unset
+        puts "export #{key}="
+      else
+        puts "export #{key}=#{value}"
+      end
+    end
+  end
+end
+