.\" $Id$
.\"
.\" 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 mandoc 1
.Os
.\" SECTION
.Sh NAME
.Nm mandoc
.Nd format and display UNIX manuals
.\" SECTION
.Sh SYNOPSIS
.Nm mandoc
.Op Fl V
.Op Fl f Ns Ar option...
.Op Fl m Ns Ar format
.Op Fl W Ns Ar err...
.Op Fl T Ns Ar output
.Op Ar infile...
.\" SECTION
.Sh DESCRIPTION
The
.Nm
utility formats 
.Ux
manual pages for display.  The arguments are as follows:
.Bl -tag -width XXXXXXXXXXXX
.\" ITEM
.It Fl f Ns Ar option...
Override default compiler behaviour.  See 
.Sx Compiler Options
for details.
.\" ITEM
.It Fl m
Input format.  See
.Sx Input Formats
for available formats.  Defaults to
.Fl m Ns Ar andoc .
.\" ITEM
.It Fl T
Output format.  See
.Sx Output Formats
for available formats.  Defaults to
.Fl T Ns Ar ascii .
.\" ITEM
.It Fl V
Print version and exit.
.\" 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 zero or more
.Ar infile .
If unspecified, reads from stdin.  If multiple files are specified,
.Nm
will halt with the first failed parse.
.El
.\" PARAGRAPH
.Pp
By default, 
.Nm 
reads 
.Xr mdoc 7
or
.Xr man 7
text from stdin, implying
.Fl m Ns Ar andoc ,
and prints 78-column backspace-encoded output to stdout as if
.Fl T Ns Ar ascii
were provided.
.\" PARAGRAPH
.Pp
.Ex -std mandoc
.\" SUB-SECTION
.Ss Punctuation
If punctuation is set apart from words, such as in the phrase
.Dq to be \&, or not to be ,
it's processed by
.Nm
according to the following rules.  Opening punctuation
.Po
.Sq \&( , 
.Sq \&[ , 
and
.Sq \&{
.Pc 
is not followed by a space. Closing punctuation
.Po
.Sq \&. , 
.Sq \&, , 
.Sq \&; , 
.Sq \&: , 
.Sq \&? , 
.Sq \&! , 
.Sq \&) , 
.Sq \&] 
and
.Sq \&}
.Pc 
is not preceeded by whitespace.
.Pp
If the input is
.Xr mdoc 7 ,
these rules are also applied to macro arguments when appropriate.
.\" SUB-SECTION
.Ss Input Formats
The
.Nm
utility accepts
.Xr mdoc 7
and
.Xr man 7
input with
.Fl m Ns Ar doc
and
.Fl m Ns Ar an ,
respectively.  The
.Xr mdoc 7
format is
.Em strongly
recommended; 
.Xr man 7
should only be used for legacy manuals.
.Pp
A third option,
.Fl m Ns Ar andoc ,
which is also the default, determines encoding on-the-fly: if the first
non-comment macro is 
.Sq \&.Dd
or
.Sq \&.Dt ,
the 
.Xr mdoc 7
parser is used; otherwise, the
.Xr man 7
parser is used.
.Pp
If multiple
files are specified with 
.Fl m Ns Ar andoc , 
each has its file-type determined this way.  If multiple files are
specified and
.Fl m Ns Ar doc
or
.Fl m Ns Ar an
is specified, then this format is used exclusively.
.\" .Pp
.\" The following escape sequences are recognised, although the per-format
.\" compiler may not allow certain sequences.
.\" .Bl -tag -width Ds -offset XXXX
.\" .It \efX
.\" sets the font mode to X (B, I, R or P, where P resets the font)
.\" .It \eX, \e(XX, \e[XN]
.\" queries the special-character table for a corresponding symbol
.\" .It \e*X, \e*(XX, \e*[XN]
.\" deprecated special-character format
.\" .El
.\" SUB-SECTION
.Ss Output Formats
The
.Nm
utility accepts the following
.Fl T
arguments:
.Bl -tag -width XXXXXXXXXXXX 
.It Fl T Ns Ar ascii
Produce 7-bit ASCII output, backspace-encoded for bold and underline
styles.  This is the default.
.It Fl T Ns Ar tree
Produce an indented parse tree.
.It Fl T Ns Ar lint
Parse only: produce no output.
.El
.Pp
If multiple input files are specified, these will be processed by the
corresponding filter in-order.
.\" SUB-SECTION
.Ss Compiler Options
Default compiler behaviour may be overriden with the
.Fl f
flag.
.Bl -tag -width XXXXXXXXXXXXXX 
.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.
.Pq mdoc only
.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 (default for 
.Xr man 7
parsing).
.It Fl f Ns Ar no-ign-macro
Do not ignore unknown macros at the start of input lines (default for 
.Xr mdoc 7
parsing).
.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.
.\" SECTION
.Sh EXAMPLES
To page manuals to the terminal:
.\" PARAGRAPH
.Pp
.D1 % mandoc \-Wall,error mandoc.1 2>&1 | less
.Pp
.D1 % mandoc mandoc.1 mdoc.3 mdoc.7 | less
.\" SECTION
.Sh SEE ALSO
.Xr mandoc_char 7 ,
.Xr mdoc 7 ,
.Xr man 7
.\" 
.Sh AUTHORS
The
.Nm
utility was written by 
.An Kristaps Dzonsons Aq kristaps@openbsd.org .
.\" SECTION
.Sh CAVEATS
The 
.Nm
utility in
.Fl T Ns Ar ascii
mode doesn't yet know how to display the following:
.Pp
.Bl -bullet -compact
.It
The \-hang 
.Sq \&.Bl
list is not yet supported.
.El
.Pp
Other macros still aren't supported by virtue of nobody complaining
about their absence.  Please report any omissions: this is a work in
progress.
.Pp
The following list documents differences between traditional
.Xr nroff 1
output and
.Nm :
.Pp
.Bl -bullet -compact
.It 
A list of display following
.Sq \&.Ss
does not assert a prior vertical break, just as it doesn't with
.Sq \&.Sh .
.It
Special characters don't follow the current font style.
.\" LIST-ITEM
.It
The \-literal and \-unfilled 
.Sq \&.Bd
displays types are synonyms, as are \-filled and \-ragged.
.El