-.\" $Id: mdoc.7,v 1.278 2019/04/24 13:15:00 schwarze Exp $
+.\" $Id: mdoc.7,v 1.282 2020/06/25 20:45:09 schwarze Exp $
.\"
.\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
-.\" Copyright (c) 2010, 2011, 2013-2018 Ingo Schwarze <schwarze@openbsd.org>
+.\" Copyright (c) 2010, 2011, 2013-2020 Ingo Schwarze <schwarze@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
-.Dd $Mdocdate: April 24 2019 $
+.Dd $Mdocdate: June 25 2020 $
.Dt MDOC 7
.Os
.Sh NAME
.It Ic \&Ss Ta subsection header (one line)
.It Ic \&Sx Ta internal cross reference to a section or subsection
.It Ic \&Xr Ta cross reference to another manual page: Ar name section
+.It Ic \&Tg Ta tag the definition of a Ar term Pq <= 1 arguments
.It Ic \&Pp Ta start a text paragraph (no arguments)
.El
.Ss Displays and lists
block.
Does not have any tail arguments.
.It Ic \&Dd Cm $\&Mdocdate$ | Ar month day , year
-Document date for display in the page footer.
+Document date for display in the page footer,
+by convention the date of the last change.
This is the mandatory first macro of any
.Nm
manual.
Format a hyperlink.
.Pp
Examples:
-.Dl \&.Lk http://bsd.lv \(dqThe BSD.lv Project\(dq
-.Dl \&.Lk http://bsd.lv
+.Dl \&.Lk https://bsd.lv \(dqThe BSD.lv Project\(dq
+.Dl \&.Lk https://bsd.lv
.Pp
See also
.Ic \&Mt .
.Ic \&Bl Fl column
lists; can only be used below
.Ic \&It .
+.It Ic \&Tg Op Ar term
+Announce that the next input line starts a definition of the
+.Ar term .
+This macro must appear alone on its own input line.
+The argument defaults to the first argument of the first macro
+on the next line.
+The argument may not contain whitespace characters, not even when it is quoted.
+This macro is a
+.Xr mandoc 1
+extension and is typically ignored by other formatters.
+.Pp
+When viewing terminal output with
+.Xr less 1 ,
+the interactive
+.Ic :t
+command can be used to go to the definition of the
+.Ar term
+as described for the
+.Ev MANPAGER
+variable in
+.Xr man 1 ;
+when producing HTML output, a fragment identifier
+.Pq Ic id No attribute
+is generated, to be used for deep linking to this place of the document.
+.Pp
+In most cases, adding a
+.Ic \&Tg
+macro would be redundant because
+.Xr mandoc 1
+is able to automatically tag most definitions.
+This macro is intended for cases where automatic tagging of a
+.Ar term
+is unsatisfactory, for example if a definition is not tagged
+automatically (false negative) or if places are tagged that do
+not define the
+.Ar term
+(false positives).
+When there is at least one
+.Ic \&Tg
+macro for a
+.Ar term ,
+no other places are automatically marked as definitions of that
+.Ar term .
.It Ic \&Tn Ar word ...
Supported only for compatibility, do not use this in new manuals.
Even though the macro name
.It Ic \&St Ta \&No Ta Yes Ta 1
.It Ic \&Sx Ta Yes Ta Yes Ta >0
.It Ic \&Sy Ta Yes Ta Yes Ta >0
+.It Ic \&Tg Ta \&No Ta \&No Ta <2
.It Ic \&Tn Ta Yes Ta Yes Ta >0
.It Ic \&Ud Ta \&No Ta \&No Ta 0
.It Ic \&Ux Ta Yes Ta Yes Ta n
.Sq \&|
character.
Using this predefined string is not recommended in new manuals.
+.Pp
+Appending a zero-width space
+.Pq Sq \e&
+to the end of an input line is also useful to prevent the interpretation
+of a trailing period, exclamation or question mark as the end of a
+sentence, for example when an abbreviation happens to occur
+at the end of a text or macro input line.
.Ss Font handling
In
.Nm
.Pp
.Bl -dash -compact
.It
-.Ic \&Dd
-with non-standard arguments behaves very strangely.
-When there are three arguments, they are printed verbatim.
-Any other number of arguments is replaced by the current date,
-but without any arguments the string
-.Dq Epoch
-is printed.
-.It
-.Ic \&Lk
-only accepts a single link-name argument; the remainder is misformatted.
-.It
.Ic \&Pa
does not format its arguments when used in the FILES section under
certain list types.
.Ic \&Ta
can only be called by other macros, but not at the beginning of a line.
.It
-.Ic \&%C
-is not implemented (up to and including groff-1.22.2).
-.It
.Sq \ef
.Pq font face
and
.Xr tbl 7
.Pp
The web page
-.Lk http://mandoc.bsd.lv/mdoc/ "extended documentation for the mdoc language"
+.Lk https://mandoc.bsd.lv/mdoc/ "extended documentation for the mdoc language"
provides a few tutorial-style pages for beginners, an extensive style
guide for advanced authors, and an alphabetic index helping to choose
the best macros for various kinds of content.
+.Pp
+The manual page
+.Lk https://man.voidlinux.org/groff_mdoc "groff_mdoc(7)"
+contained in the
+.Dq groff
+package documents exactly the same language in a somehwat different style.
.Sh HISTORY
The
.Nm
git.ckatri.com / mandoc.git / blobdiff