Assure API descriptions can contain '"' characters

src/mako/cli/lib/argparse.mako

@@ -2,7 +2,7 @@
 <%!
     import os
 
-    from util import (put_and, supports_scopes, api_index, indent_by, enclose_in, put_and)
+    from util import (put_and, supports_scopes, api_index, indent_by, enclose_in, put_and, escape_rust_string)
     from cli import (mangle_subcommand, new_method_context, PARAM_FLAG, STRUCT_FLAG, UPLOAD_FLAG, OUTPUT_FLAG, VALUE_ARG,
                      CONFIG_DIR, SCOPE_FLAG, is_request_value_property, FIELD_SEP, docopt_mode, FILE_ARG, MIME_ARG, OUT_ARG,
                      CONFIG_DIR_FLAG, KEY_VALUE_ARG, to_docopt_arg, DEBUG_FLAG, DEBUG_AUTH_FLAG, MODE_ARG, SCOPE_ARG,
@@ -239,7 +239,7 @@ let mut app = App::new("${util.program_name()}")
 .author("${', '.join(cargo.authors)}")
 .version("${util.crate_version()}")
 % if description is not UNDEFINED:
-.about("${description}")
+.about("${escape_rust_string(description)}")
 % endif
 .after_help("${url_info}")
 % for flag, desc, arg_name, multiple in global_args:

src/mako/lib/util.py

@@ -217,6 +217,10 @@ def markdown_comment(s):
 def estr(l):
     return ['"%s"' % i for i in l]
 
+# escape all '"' with '\"'
+def escape_rust_string(s):
+    return s.replace('"', '\\"')
+
 ## -- End Filters -- @}
 
 # ==============================================================================