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39 lines
1.1 KiB
Plaintext
39 lines
1.1 KiB
Plaintext
dnl Took from https://en.wikipedia.org/wiki/M4_(computer_language)
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divert(-1)
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M4 has multiple output queues that can be manipulated with the
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`divert' macro. Valid queues range from 0 to 10, inclusive, with
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the default queue being 0.
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Calling the `divert' macro with an invalid queue causes text to be
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discarded until another call. Note that even while output is being
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discarded, quotes around `divert' and other macros are needed to
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prevent expansion.
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# Macros aren't expanded within comments, meaning that keywords such
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# as divert and other built-ins may be used without consequence.
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# HTML utility macro:
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define(`H2_COUNT', 0)
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# The H2_COUNT macro is redefined every time the H2 macro is used:
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define(`H2',
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`define(`H2_COUNT', incr(H2_COUNT))<h2>H2_COUNT. $1</h2>')
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divert(1)dnl
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dnl
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dnl The dnl macro causes m4 to discard the rest of the line, thus
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dnl preventing unwanted blank lines from appearing in the output.
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dnl
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H2(First Section)
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H2(Second Section)
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H2(Conclusion)
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dnl
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divert(0)dnl
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dnl
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<HTML>
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undivert(1)dnl One of the queues is being pushed to output.
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</HTML>
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