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(texinfo)Invoking Macros

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Invoking Macros
===============

  After a macro is defined (see the previous section), you can use
("invoke") it in your document like this:

     @MACRONAME {ARG1, ARG2, ...}

and the result will be just as if you typed the body of MACRONAME at
that spot.  For example:

     @macro foo {p, q}
     Together: \p\ & \q\.
     @end macro
     @foo{a, b}

produces:

     Together: a & b.

  Thus, the arguments and parameters are separated by commas and
delimited by braces; any whitespace after (but not before) a comma is
ignored.  The braces are required in the invocation (but not the
definition), even when the macro takes no arguments, consistent with
all other Texinfo commands.  For example:

     @macro argless {}
     No arguments here.
     @end macro
     @argless{}

produces:

     No arguments here.

  To insert a comma, brace, or backslash in an argument, prepend a
backslash, as in

     @MACNAME {\\\{\}\,}

which will pass the (almost certainly error-producing) argument `\{},'
to MACNAME.  However, commas in parameters, even if escaped by a
backslash, might cause trouble in TeX.

  If the macro is defined to take a single argument, and is invoked
without any braces, the entire rest of the line after the macro name is
supplied as the argument.  For example:

     @macro bar {p}
     Twice: \p\ & \p\.
     @end macro
     @bar aah

produces:

     Twice: aah & aah.

  If the macro is defined to take a single argument, and is invoked with
braces, the braced text is passed as the argument, regardless of
commas.  For example:

     @macro bar {p}
     Twice: \p\ & \p\.
     @end macro
     @bar{a,b}

produces:

     Twice: a,b & a,b.