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-.\" $Id$
-.\"
-.\" Copyright (c) 2009 Kristaps Dzonsons <kristaps@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 copyright notice and this permission notice appear in all
-.\" copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
-.\" WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
-.\" WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
-.\" AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
-.\" DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
-.\" PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
-.\" TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
-.\" PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate$
-.Dt mdoctree 1
-.Os
-.\" SECTION
-.Sh NAME
-.Nm mdoctree
-.Nd mdoc macro compiler
-.\" SECTION
-.Sh SYNOPSIS
-.Nm mdoctree
-.Op Fl vV
-.Op Fl f Ns Ar options...
-.Op Fl W Ns Ar err...
-.Op Ar infile
-.\" SECTION
-.Sh DESCRIPTION
-The
-.Nm
-utility parses a BSD 
-.Dq mdoc 
-manual pages and prints its syntax tree.  It's commonly used to see the
-syntax tree of a document when building new 
-.Xr mdoc 3
-utilities.  The arguments are as follows:
-.Bl -tag -width XXXXXXXXXXXX
-.\" ITEM
-.It Fl v
-Print verbose parsing output.
-.\" ITEM
-.It Fl V
-Print version and exit.
-.\" ITEM
-.It Fl f Ns Ar option...
-Override default compiler behaviour.  See 
-.Sx Compiler Options
-for details.
-.\" ITEM
-.It Fl W Ns Ar err...
-Print warning messages.  May be set to 
-.Fl W Ns Ar all
-for all warnings, 
-.Ar compat
-for groff/troff-compatibility warnings, or
-.Ar syntax
-for syntax warnings.  If
-.Fl W Ns Ar error 
-is specified, warnings are considered errors and cause utility
-termination.  Multiple 
-.Fl W
-arguments may be comma-separated, such as
-.Fl W Ns Ar error,all .
-.\" ITEM
-.It Ar infile
-Read input from
-.Ar infile ,
-which may be 
-.Dq \-
-for stdin.
-.El
-.\" PARAGRAPH
-.Pp
-The
-.Nm
-utility is a formatting front-end for
-.Xr mdoc 3 ,
-which parses the 
-.Dq mdoc
-input, documented at
-.Xr mdoc 7
-and
-.Xr mdoc.samples 7 ,
-into an abstract syntax tree.  By default, it reads from stdin and
-prints the syntax tree to stdout.
-.\" PARAGRAPH
-.Pp
-.Ex -std mdoctree
-.\" SUB-SECTION
-.Ss Compiler Options
-Default compiler behaviour may be overriden with the
-.Fl f
-flag.  The available options are as follows:
-.Bl -tag -width XXXXXXXXXXXX -offset XXXX
-.It Fl f Ns Ar ign-scope
-When rewinding the scope of a block macro, forces the compiler to ignore
-scope violations.  This can seriously mangle the resulting tree.
-.It Fl f Ns Ar ign-escape
-Ignore invalid escape sequences.
-.It Fl f Ns Ar ign-macro
-Ignore unknown macros at the start of input lines.
-.El
-.\" PARAGRAPH
-.Pp
-As with the
-.Fl W
-flag, multiple
-.Fl f
-options may be grouped and delimited with a comma.  Using
-.Fl f Ns Ar ign-scope,ign-escape ,
-for example, will try to ignore scope and character-escape errors.
-.\" SUB-SECTION
-.Ss Input Encoding
-The
-.Nm
-utility expects its input to be 7-bit ASCII as defined in
-.Xr ascii 7 .
-The only non-graphing characters accepted are spaces,
-.Sq \  ,
-and tabs,
-.Sq \et .
-Tabs are only accepted in literal block-displays and as column
-delimiters.
-.Pp
-Only Unix-style newlines (\en) are accepted; if the newline is escaped,
-the line is concatenated with the next.
-.\" SUB-SECTION
-.Ss Character Escapes
-Since
-.Nm
-doesn't format its output, character escapes are displayed as passed
-into the compiler. 
-.\" SECTION
-.Sh EXAMPLES
-To validate this manual page:
-.\" PARAGRAPH
-.Pp
-.D1 % mdoctree \-Wall,error mdoctree.1 
-.\" SECTION
-.Sh SEE ALSO
-.Xr mdocterm 1 ,
-.Xr mdoclint 1 ,
-.Xr mdoc.samples 7 ,
-.Xr mdoc 7 ,
-.Xr mdoc 3
-.\" 
-.Sh AUTHORS
-The
-.Nm
-utility was written by 
-.An Kristaps Dzonsons Aq kristaps@openbsd.org .
-.\" SECTION
-.Sh CAVEATS
-See
-.Xr mdoc 3
-for a list of bugs, caveats, and incomplete macros.