Bug#20328 mysql client: dumb about trailing spaces on help command.

client/mysql.cc:
  Remove trailing spaces from help arguments in com_server_help. 
  Disregard trailing spaces from command in com_help.
mysql-test/r/mysql_client.result:
  Test trailing spaces on the help command.
mysql-test/t/mysql_client.test:
  Result trailing spaces on the help command.

client/mysql.cc

@@ -1725,7 +1725,14 @@ static int com_server_help(String *buffer __attribute__((unused)),
   
   if (help_arg[0] != '\'')
   {
-    (void) strxnmov(cmd_buf, sizeof(cmd_buf), "help '", help_arg, "'", NullS);
+	char *end_arg= strend(help_arg);
+	if(--end_arg)
+	{
+		while (my_isspace(charset_info,*end_arg))
+          end_arg--;
+		*++end_arg= '\0';
+	}
+	(void) strxnmov(cmd_buf, sizeof(cmd_buf), "help '", help_arg, "'", NullS);
     server_cmd= cmd_buf;
   }
   
@@ -1811,9 +1818,13 @@ com_help(String *buffer __attribute__((unused)),
 {
   reg1 int i, j;
   char * help_arg= strchr(line,' '), buff[32], *end;
-
   if (help_arg)
-    return com_server_help(buffer,line,help_arg+1);
+  {
+    while (my_isspace(charset_info,*help_arg))
+      help_arg++;
+	if (*help_arg)	  
+	  return com_server_help(buffer,line,help_arg);
+  }
 
   put_info("\nFor information about MySQL products and services, visit:\n"
            "   http://www.mysql.com/\n"

mysql-test/r/mysql_client.result

+?         (\?) Synonym for `help'.
+clear     (\c) Clear command.
+connect   (\r) Reconnect to the server. Optional arguments are db and host.
+delimiter (\d) Set query delimiter. 
+edit      (\e) Edit command with $EDITOR.
+ego       (\G) Send command to mysql server, display result vertically.
+exit      (\q) Exit mysql. Same as quit.
+go        (\g) Send command to mysql server.
+help      (\h) Display this help.
+nopager   (\n) Disable pager, print to stdout.
+notee     (\t) Don't write into outfile.
+pager     (\P) Set PAGER [to_pager]. Print the query results via PAGER.
+print     (\p) Print current command.
+prompt    (\R) Change your mysql prompt.
+quit      (\q) Quit mysql.
+rehash    (\#) Rebuild completion hash.
+source    (\.) Execute an SQL script file. Takes a file name as an argument.
+status    (\s) Get status information from the server.
+system    (\!) Execute a system shell command.
+tee       (\T) Set outfile [to_outfile]. Append everything into given outfile.
+use       (\u) Use another database. Takes database name as argument.
+charset_name(\C) Switch to another charset. Might be needed for processing binlog.
+?         (\?) Synonym for `help'.
+clear     (\c) Clear command.
+connect   (\r) Reconnect to the server. Optional arguments are db and host.
+delimiter (\d) Set query delimiter. 
+edit      (\e) Edit command with $EDITOR.
+ego       (\G) Send command to mysql server, display result vertically.
+exit      (\q) Exit mysql. Same as quit.
+go        (\g) Send command to mysql server.
+help      (\h) Display this help.
+nopager   (\n) Disable pager, print to stdout.
+notee     (\t) Don't write into outfile.
+pager     (\P) Set PAGER [to_pager]. Print the query results via PAGER.
+print     (\p) Print current command.
+prompt    (\R) Change your mysql prompt.
+quit      (\q) Quit mysql.
+rehash    (\#) Rebuild completion hash.
+source    (\.) Execute an SQL script file. Takes a file name as an argument.
+status    (\s) Get status information from the server.
+system    (\!) Execute a system shell command.
+tee       (\T) Set outfile [to_outfile]. Append everything into given outfile.
+use       (\u) Use another database. Takes database name as argument.
+charset_name(\C) Switch to another charset. Might be needed for processing binlog.

mysql-test/t/mysql_client.test

+# This test should work in embedded server after we fix mysqltest
+-- source include/not_embedded.inc
+
+#
+# Bug #20328: mysql client interprets commands in comments
+#
+--exec echo 'help' | $MYSQL
+--exec echo 'help ' | $MYSQL
+