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-.so u.tmac
-.
-.de @h
-. sp |36p
-. if \\n%>1 .tl ''-%-''
-. sp |1i
-..
-.de @f
-.sp |\\n(.pu-36p
-.tl ''\\*(#e''
-..
-.
-.t
-Hacking on the
-.x µ
-macro package
-.d
-John Ankarström
-.
-.
-.h
-What is
-.x µ ?
-.p
-.i µ
-or
-.i mu
-is a simple macro package for troff
-designed to abstract as little as possible from troff itself,
-while still providing a powerful framework for
-writing advanced documents.
-.
-.
-.h
-How is the source code of
-.x µ
-organized?
-.p
-If you run
-.c "grep -n [-]-"
-on the
-.i u.tmac
-source file, you are presented with an overview of
-.i µ 's
-macros:
-.l
-.eo
-!grep -n [-]- u.tmac
-.ec
-.p
-This is a sufficient summary of the entire
-.i µ
-source code, as nothing is performed outside of these macros.
-All initialization is performed in the
-.c @a
-macro, which is automatically called at the first invocation
-of any other macro.
-.p
-The above summary reflects a categorization in the macros defined by
-.i µ .
-There are internal and external macros.
-The former are to be used within
-.i u.tmac
-itself, while the latter are to be used in
-.i µ
-documents.
-Among the external macros, there are inline, environment (or block-level),
-hybrid and other macros.
-.p
-The inline macros all follow the same pattern.
-They take three arguments:
-the string to be formatted,
-an optional suffix
-and an optional prefix.
-The hybrid macros act as inline macros when given arguments;
-otherwise they act as environment macros.
-.p
-The environment or block-level macros generally take no arguments
-(except
-.c d ).
-Instead, they activate a given environment,
-affecting the formatting of the following text.
-Each environment macro is associated with a specific environment,
-carrying the same one-letter name as the macro itself.
-.p
-As you can see,
-the macros in each category are arranged alphabetically.
-.
-.
-.h
-Where is document state stored?
-.p
-Most state is stored by troff itself within the different environments.
-In addition,
-.i µ
-associates three extra registers with each environment:
-.c sp ,
-the amount of space to be added by
-.c @e
-before an environment;
-.c sq ,
-the same (except the space is not added
-if the new environment is identical to the previous one); and
-.c ti ,
-the indentation of the first line in the
-.c p
-environment.
-These are stored in registers named
-.c @ENV_sp ,
-.c @ENV_sq
-and
-.c @ENV_ti ,
-where
-.c ENV
-is the name of the associated environment.
-.p
-The strings
-.c %env
-and
-.c %penv
-contain the name of the current and previous environment.
-.p
-The
-.c @a
-register is set to 1 if the document has been initialized
-(i.e. if
-.c @a
-has been invoked).
-.p
-The
-.c @m
-register is non-zero if
-.q "manual footer"
-mode is active.
-If
-.c @m
-is non-zero,
-.c @tf
-decrements it by one and exits when invoked,
-unless called with the
-.c f
-(force) argument.
-This is useful if you want to trigger the footer manually,
-but do not want the printed footer to trigger the footer trap again.
-.p
-.c @.t
-contains the absolute vertical position of the first trap
-following the first footnote reference on a page;
-it is set and used by
-.c )
-to place the footnote trap in the correct vertical position.
-.c @dn
-contains the height of all collected footnotes on a page;
-it is set by
-.c )
-and reset to zero by
-.c @tn .
-.c @n
-contains the total number of collected footnotes.
-.p
-Note that none of these registers and strings should be
-directly accessed or modified by
-.i µ
-documents.