parse-options: add PARSE_OPT_LITERAL_ARGHELP for complicated argh's
Usually, the argh element in struct option points at a placeholder value (e.g. "val"), and is shown in the usage message as --option=<val> by enclosing the string inside of angle brackets. When the option is more complex (e.g. optional arguments separated by a comma), you would want to produce a usage message that looks like --option=<val1>[,<val2>] In such a case, the caller can pass a string to argh with placeholders already enclosed in necessary angle brackets (e.g. "<val1>[,<val2>]") and set this flag. Signed-off-by: NStephen Boyd <bebarino@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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