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Hi,
:help gq :help gw :help usr_25 (version dependent -> 'Editing formatted text') IMHO gwap is wonderful. Autodetection of E-Mails also lets it reformat '>'-quoted or indented text.
I know, I know. :) That's what I use in practice. But the original question was about piping stuff throu external programs, such as Lua. That's why I used fmt as an example. []s, Diego.