dnl Took from https://en.wikipedia.org/wiki/M4_(computer_language) divert(-1) M4 has multiple output queues that can be manipulated with the `divert' macro. Valid queues range from 0 to 10, inclusive, with the default queue being 0. Calling the `divert' macro with an invalid queue causes text to be discarded until another call. Note that even while output is being discarded, quotes around `divert' and other macros are needed to prevent expansion. # Macros aren't expanded within comments, meaning that keywords such # as divert and other built-ins may be used without consequence. # HTML utility macro: define(`H2_COUNT', 0) # The H2_COUNT macro is redefined every time the H2 macro is used: define(`H2', `define(`H2_COUNT', incr(H2_COUNT))

H2_COUNT. $1

') divert(1)dnl dnl dnl The dnl macro causes m4 to discard the rest of the line, thus dnl preventing unwanted blank lines from appearing in the output. dnl H2(First Section) H2(Second Section) H2(Conclusion) dnl divert(0)dnl dnl undivert(1)dnl One of the queues is being pushed to output.