Re: [PATCH] git fast-export: add --no-data option

Johannes Schindelin wrote:

There is an ugly solution:

		{ OPTION_NEGBIT, 0, "no-data", &no_data, NULL, NULL,
			PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 0 },
		{ OPTION_BIT, 0, "no-data", NULL, NULL,
			"Skip output of blob data",
			PARSE_OPT_NOARG, NULL, 1 },

and there is a more elegant solution:

[PATCH] parse-opt: optionally show "--no-" option string

It is usually better to have positive options, to avoid confusing double
negations.  However, sometimes it is desirable to show the negative option
in the help.

Introduce the flag PARSE_OPT_NEGHELP to do that.

Perhaps with this documentation throw in?

diff --git a/parse-options.h b/parse-options.h
index 90e577d..14162e9 100644
--- a/parse-options.h
+++ b/parse-options.h

@@ -81,6 +81,9 @@ typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
  *   PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets
  *                             (i.e. '<argh>') in the help message.
  *                             Useful for options with multiple parameters.
+ *   PARSE_OPT_NEGHELP: says that the long option should always be shown with
+ *                     the --no prefix in the usage message. Sometimes
+ *                     useful for users of OPTION_NEGBIT.
  *
  * `callback`::
  *   pointer to the callback to use for OPTION_CALLBACK.