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.\" -*- nroff -*-
.ig
devtag.tmac - macro package for adding tags to roff documents.

File position: <groff_source_top>/tmac/devtag.tmac
Installed position: groff's main macro directory.

------------------------------------------------------------------------
    Legalese
------------------------------------------------------------------------

This file is part of groff, the GNU roff type-setting system.

Copyright (C) 2004-2014 Free Software Foundation, Inc.
written by Gaius Mulley <gaius@glam.ac.uk>.

groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or
(at your option) any later version.

groff is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.


------------------------------------------------------------------------
    Description
------------------------------------------------------------------------

A simple set of macros to provide markup devices (currently only grohtml)
with tags that define the meaning of the formatted text and also
basic formatting instructions.  It generalizes the tag concept used within
grohtml and in the future it is hoped that more markup based devices
can capitalize on this work.  It also clearly defines those tags which are
honoured by grohtml.  Note that not all tags are included here.  Some
of the grohtml specific tags (header specific and jobname, etc.) are
called directly from within www.tmac.  The tags defined here are
reasonably generic and could be applied to other devices.
..
.
.do if d DEVTAG-NH .nx
.
.nr _C \n(.C
.cp 0
.
.\" --------------------------------------------------------------------
.\" DEVTAG <name>
.\"
.\"   Emit a tag <name>
.\"
.de DEVTAG
.  tag devtag:\\$*
..
.\" --------------------------------------------------------------------
.\" DEVTAG-NEXT <name>
.\"
.\"   When the troff state changes, emit tag <name>
.\"
.de DEVTAG-NEXT
.  taga devtag:\\$*
..
.
.\" --------------------------------------------------------------------
.\"  SH <level>
.\"  NH <level>
.\"       tell device we are starting a numbered heading
.\"       Takes a single parameter <level>. <level> 1
.\"       is the outer most level.
.
.de DEVTAG-NH
.   DEVTAG ".NH \\$1"
..
.als DEVTAG-SH DEVTAG-NH
.
.\" --------------------------------------------------------------------
.\"  COL <n>
.\"     indicate that the following text is aligned for the column <n>
.\"     n: [1..MAX(n)]
.
.de DEVTAG-COL
.   DEVTAG ".col \\$1"
..
.
.\" --------------------------------------------------------------------
.\"  EO-H
.\"     indicate that a header has finished.
.
.de DEVTAG-EO-H
.   DEVTAG ".eo.h"
..
.\" --------------------------------------------------------------------
.\"  EO-TL
.\"     indicate that a title has finished.
.
.de DEVTAG-EO-TL
.   DEVTAG ".eo.tl"
..
.\" --------------------------------------------------------------------
.\"  TL
.\"     indicate that the following text forms a title.
.
.de DEVTAG-TL
.   DEVTAG ".tl"
..
.
.\" --------------------------------------------------------------------
.\"  COL-NEXT <n>
.\"     emit a column tag just before the next glyph.
.
.de DEVTAG-COL-NEXT
.   DEVTAG-NEXT ".col \\$1"
..
.
.
.cp \n[_C]
.
.
.\" --------------------------------------------------------------------
.\" Emacs settings
.\" --------------------------------------------------------------------
.
.\" Local Variables:
.\" mode: nroff
.\" End:
.\" EOF