y.pm: add base64 funcs and env_path function

y.pm

@@ -114,6 +114,9 @@ sub html2text
 }
 
 # more easily b64 decode/encode
+sub b64 { &base64 }
+sub b64d { &decode_base64 }
+sub b64e { &encode_base64 }
 sub base64
 {
   return $_[0] =~ /^[A-Za-z0-9+\/\r\n]+={0,2}$/ ? decode_base64($_[0]) : encode_base64($_[0]);
@@ -697,6 +700,12 @@ sub cd
   return chdir($_[0]);
 }
 
+# get path of something from env variable, otherwise use default
+sub env_path
+{
+  return $ENV{"$_[0]_PATH"} || $_[0];
+}
+
 # is stdin piped in?
 # useful for scripts that can be used in a pipeline
 sub piped