I am using a StringSliceP from the Pflag libraray accept a list of strings as CLI arguments.
I am calling the Go application from the Windows Command Prompt.
I would like some of the strings of the list to contain a (") double quote character, but I have not been able to do this.
Escaping the quotes does not work:
goapp.exe --string-slice-list "a\"b",c,d,e
Expected result: []string{"a\"b", "c", "d", "e"}
Actual result: Error: invalid argument "a\"\\b,c,d,e" for "--string-slice-list" flag: parse error on line 1, column 1: bare " in non-quoted-field
Doubling up the quotes does not work:
goapp.exe --string-slice-list "a""b",c,d,e
Expected result: []string{"a\"b", "c", "d", "e"}
Actual result: Error: invalid argument "a\"b,c,d,e" for "--string-slice-list" flag: parse error on line 1, column 1: bare " in non-quoted-field
Here is how to do it from a Windows command prompt:
goapp.exe --string-slice-list \"a\"\"b\",c,d,e
yields [a"b c d e] and
goapp.exe --string-slice-list \"a\\\"\"b\",c,d,e
does [a\"b c d e] (I’m not sure which one you actually want).
The reason for this is, as has been pointed out, that the Pflag library makes use of the Go standard library encoding/csv supporting the format described in RFC 4180. If we refer to section 2 from paragraphs 5, 6 and 7:
If fields are not enclosed with double quotes, then double quotes may not appear inside the fields.
Fields containing line breaks (CRLF), double quotes, and commas should be enclosed in double-quotes.
If double-quotes are used to enclose fields, then a double-quote appearing inside a field must be escaped by preceding it with another double quote.