New macros for M4sugar

[Stefano Gioffré]

Hi!

This is just an open proposal. I have imported some self-documented macros of mine to autoconf/lib/m4sugar/m4sugar.m4 (please see the patch attached):

• m4_case_in(): Searches for the existence of a text within one or more lists, using a syntax identical to that of m4_case()
• m4_define_substrings_as(): Searches for the first match of a regular _expression_ in a string and defines custom macros accordingly
• m4_for_each_match(): Calls a custom macro for every occurrence of a regular _expression_ in a string
• m4_get_replacements() Replaces every occurrence of a regular _expression_ in a string with the text returned by a custom macro, invoked for each match
• m4_lambda(): Creates an anonymous macro on the fly, able to be passed as a callback argument
• m4_list_index(): Searches for the first occurence of a string in a list and returns its position, or -1 if the string as not been found
• m4_repeat(): Repeats a text n times
• m4_redepth(): Examines a regular _expression_ and returns the number of capturing parentheses present

Please browse the patched m4sugar.m4 file for the complete documentation with examples. This patch refers to commit 5b9db67786a428164abafe626ab11a2754aad528 (2019-09-10 08:00:33 -0700).

All the best

--madmurphy

autoconf.patch
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