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Annotation of mandoc/mandoc.1, Revision 1.88

1.88    ! kristaps    1: .\"    $Id: mandoc.1,v 1.87 2011/05/17 22:32:45 kristaps Exp $
1.1       kristaps    2: .\"
1.72      schwarze    3: .\" Copyright (c) 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
1.1       kristaps    4: .\"
                      5: .\" Permission to use, copy, modify, and distribute this software for any
1.16      kristaps    6: .\" purpose with or without fee is hereby granted, provided that the above
                      7: .\" copyright notice and this permission notice appear in all copies.
1.1       kristaps    8: .\"
1.16      kristaps    9: .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     10: .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     11: .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     12: .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     13: .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     14: .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     15: .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1       kristaps   16: .\"
1.87      kristaps   17: .Dd $Mdocdate: May 17 2011 $
1.14      kristaps   18: .Dt MANDOC 1
1.1       kristaps   19: .Os
                     20: .Sh NAME
                     21: .Nm mandoc
1.8       kristaps   22: .Nd format and display UNIX manuals
1.1       kristaps   23: .Sh SYNOPSIS
                     24: .Nm mandoc
1.58      kristaps   25: .Op Fl V
1.8       kristaps   26: .Op Fl m Ns Ar format
1.58      kristaps   27: .Op Fl O Ns Ar option
1.37      kristaps   28: .Op Fl T Ns Ar output
1.77      schwarze   29: .Op Fl W Ns Ar level
1.58      kristaps   30: .Op Ar file...
1.1       kristaps   31: .Sh DESCRIPTION
                     32: The
                     33: .Nm
1.26      kristaps   34: utility formats
1.8       kristaps   35: .Ux
1.57      kristaps   36: manual pages for display.
                     37: The arguments are as follows:
1.19      kristaps   38: .Bl -tag -width Ds
                     39: .It Fl m Ns Ar format
1.57      kristaps   40: Input format.
                     41: See
1.8       kristaps   42: .Sx Input Formats
1.57      kristaps   43: for available formats.
                     44: Defaults to
1.58      kristaps   45: .Fl m Ns Cm andoc .
                     46: .It Fl O Ns Ar option
1.57      kristaps   47: Comma-separated output options.
1.19      kristaps   48: .It Fl T Ns Ar output
1.57      kristaps   49: Output format.
                     50: See
1.1       kristaps   51: .Sx Output Formats
1.57      kristaps   52: for available formats.
                     53: Defaults to
1.58      kristaps   54: .Fl T Ns Cm ascii .
1.1       kristaps   55: .It Fl V
                     56: Print version and exit.
1.77      schwarze   57: .It Fl W Ns Ar level
                     58: Specify the minimum message
                     59: .Ar level
                     60: to be reported on the standard error output and to affect the exit status.
                     61: The
                     62: .Ar level
                     63: can be
                     64: .Cm warning ,
                     65: .Cm error ,
                     66: or
                     67: .Cm fatal .
                     68: The default is
                     69: .Fl W Ns Cm fatal ;
1.58      kristaps   70: .Fl W Ns Cm all
1.77      schwarze   71: is an alias for
                     72: .Fl W Ns Cm warning .
                     73: See
                     74: .Sx EXIT STATUS
                     75: and
                     76: .Sx DIAGNOSTICS
                     77: for details.
                     78: .Pp
                     79: The special option
                     80: .Fl W Ns Cm stop
                     81: tells
                     82: .Nm
                     83: to exit after parsing a file that causes warnings or errors of at least
                     84: the requested level.
                     85: No formatted output will be produced from that file.
                     86: If both a
                     87: .Ar level
                     88: and
                     89: .Cm stop
                     90: are requested, they can be joined with a comma, for example
                     91: .Fl W Ns Cm error , Ns Cm stop .
1.58      kristaps   92: .It Ar file
                     93: Read input from zero or more files.
1.57      kristaps   94: If unspecified, reads from stdin.
                     95: If multiple files are specified,
1.2       kristaps   96: .Nm
                     97: will halt with the first failed parse.
1.1       kristaps   98: .El
                     99: .Pp
1.26      kristaps  100: By default,
                    101: .Nm
                    102: reads
1.8       kristaps  103: .Xr mdoc 7
1.12      kristaps  104: or
                    105: .Xr man 7
1.8       kristaps  106: text from stdin, implying
1.58      kristaps  107: .Fl m Ns Cm andoc ,
1.48      kristaps  108: and produces
1.58      kristaps  109: .Fl T Ns Cm ascii
1.48      kristaps  110: output.
1.8       kristaps  111: .Ss Input Formats
                    112: The
                    113: .Nm
                    114: utility accepts
                    115: .Xr mdoc 7
                    116: and
                    117: .Xr man 7
                    118: input with
1.58      kristaps  119: .Fl m Ns Cm doc
1.8       kristaps  120: and
1.58      kristaps  121: .Fl m Ns Cm an ,
1.57      kristaps  122: respectively.
                    123: The
1.8       kristaps  124: .Xr mdoc 7
                    125: format is
                    126: .Em strongly
1.26      kristaps  127: recommended;
1.8       kristaps  128: .Xr man 7
                    129: should only be used for legacy manuals.
1.11      kristaps  130: .Pp
1.12      kristaps  131: A third option,
1.58      kristaps  132: .Fl m Ns Cm andoc ,
1.13      kristaps  133: which is also the default, determines encoding on-the-fly: if the first
1.26      kristaps  134: non-comment macro is
1.27      kristaps  135: .Sq \&Dd
1.13      kristaps  136: or
1.27      kristaps  137: .Sq \&Dt ,
1.26      kristaps  138: the
1.13      kristaps  139: .Xr mdoc 7
                    140: parser is used; otherwise, the
                    141: .Xr man 7
                    142: parser is used.
                    143: .Pp
                    144: If multiple
1.26      kristaps  145: files are specified with
1.58      kristaps  146: .Fl m Ns Cm andoc ,
1.57      kristaps  147: each has its file-type determined this way.
                    148: If multiple files are
1.13      kristaps  149: specified and
1.58      kristaps  150: .Fl m Ns Cm doc
1.12      kristaps  151: or
1.58      kristaps  152: .Fl m Ns Cm an
1.12      kristaps  153: is specified, then this format is used exclusively.
1.1       kristaps  154: .Ss Output Formats
                    155: The
                    156: .Nm
                    157: utility accepts the following
                    158: .Fl T
1.66      kristaps  159: arguments, which correspond to output modes:
1.19      kristaps  160: .Bl -tag -width Ds
1.88    ! kristaps  161: .It Fl T Ns Cm utf8
        !           162: Encode output in the UTF-8 multi-byte format.
        !           163: See
        !           164: .Xr UTF-8 Output .
1.87      kristaps  165: .It Fl T Ns Cm locale
1.88    ! kristaps  166: Encode output using the current
        !           167: .Xr locale 1 .
1.87      kristaps  168: See
                    169: .Sx Locale Output .
1.58      kristaps  170: .It Fl T Ns Cm ascii
1.81      kristaps  171: Produce 7-bit ASCII output.
1.57      kristaps  172: This is the default.
                    173: See
1.48      kristaps  174: .Sx ASCII Output .
1.58      kristaps  175: .It Fl T Ns Cm html
1.81      kristaps  176: Produce strict CSS1/HTML-4.01 output.
1.57      kristaps  177: See
1.48      kristaps  178: .Sx HTML Output .
1.58      kristaps  179: .It Fl T Ns Cm lint
                    180: Parse only: produce no output.
                    181: Implies
1.77      schwarze  182: .Fl W Ns Cm warning .
1.73      kristaps  183: .It Fl T Ns Cm pdf
                    184: Produce PDF output.
                    185: See
                    186: .Sx PDF Output .
1.62      kristaps  187: .It Fl T Ns Cm ps
                    188: Produce PostScript output.
                    189: See
                    190: .Sx PostScript Output .
1.58      kristaps  191: .It Fl T Ns Cm tree
                    192: Produce an indented parse tree.
                    193: .It Fl T Ns Cm xhtml
1.81      kristaps  194: Produce strict CSS1/XHTML-1.0 output.
1.57      kristaps  195: See
1.50      kristaps  196: .Sx XHTML Output .
1.1       kristaps  197: .El
1.13      kristaps  198: .Pp
                    199: If multiple input files are specified, these will be processed by the
                    200: corresponding filter in-order.
1.88    ! kristaps  201: .Ss UTF-8 Output
        !           202: Use
        !           203: .Fl T Ns Cm utf8
        !           204: to force a UTF-8 locale.
        !           205: See
        !           206: .Sx Locale Output
        !           207: for details and options.
1.87      kristaps  208: .Ss Locale Output
                    209: Locale-depending output encoding is triggered with
                    210: .Fl T Ns Cm locale .
                    211: This option is not available on all systems: systems without locale
                    212: support, or those whose internal representation is not natively UCS-4,
                    213: will fall back to
                    214: .Fl T Ns Cm ascii .
                    215: See
                    216: .Sx ASCII Output
                    217: for font style specification and available command-line arguments.
1.66      kristaps  218: .Ss ASCII Output
                    219: Output produced by
                    220: .Fl T Ns Cm ascii ,
                    221: which is the default, is rendered in standard 7-bit ASCII documented in
                    222: .Xr ascii 7 .
                    223: .Pp
                    224: Font styles are applied by using back-spaced encoding such that an
                    225: underlined character
                    226: .Sq c
                    227: is rendered as
                    228: .Sq _ Ns \e[bs] Ns c ,
                    229: where
                    230: .Sq \e[bs]
                    231: is the back-space character number 8.
                    232: Emboldened characters are rendered as
                    233: .Sq c Ns \e[bs] Ns c .
                    234: .Pp
                    235: The special characters documented in
                    236: .Xr mandoc_char 7
                    237: are rendered best-effort in an ASCII equivalent.
1.87      kristaps  238: If no equivalent is found,
                    239: .Sq \&?
                    240: is used instead.
1.66      kristaps  241: .Pp
                    242: Output width is limited to 78 visible columns unless literal input lines
                    243: exceed this limit.
                    244: .Pp
                    245: The following
                    246: .Fl O
                    247: arguments are accepted:
1.19      kristaps  248: .Bl -tag -width Ds
1.66      kristaps  249: .It Cm width Ns = Ns Ar width
                    250: The output width is set to
                    251: .Ar width ,
                    252: which will normalise to \(>=60.
1.1       kristaps  253: .El
1.66      kristaps  254: .Ss HTML Output
                    255: Output produced by
                    256: .Fl T Ns Cm html
                    257: conforms to HTML-4.01 strict.
                    258: .Pp
1.61      kristaps  259: The
1.66      kristaps  260: .Pa example.style.css
1.83      kristaps  261: file documents style-sheet classes available for customising output.
                    262: If a style-sheet is not specified with
                    263: .Fl O Ns Ar style ,
                    264: .Fl T Ns Cm html
                    265: defaults to simple output readable in any graphical or text-based web
                    266: browser.
1.66      kristaps  267: .Pp
                    268: Special characters are rendered in decimal-encoded UTF-8.
                    269: .Pp
                    270: The following
1.64      kristaps  271: .Fl O
1.66      kristaps  272: arguments are accepted:
1.37      kristaps  273: .Bl -tag -width Ds
1.64      kristaps  274: .It Cm includes Ns = Ns Ar fmt
1.40      kristaps  275: The string
                    276: .Ar fmt ,
1.49      kristaps  277: for example,
1.40      kristaps  278: .Ar ../src/%I.html ,
                    279: is used as a template for linked header files (usually via the
                    280: .Sq \&In
1.57      kristaps  281: macro).
                    282: Instances of
1.43      kristaps  283: .Sq \&%I
1.57      kristaps  284: are replaced with the include filename.
                    285: The default is not to present a
1.40      kristaps  286: hyperlink.
1.64      kristaps  287: .It Cm man Ns = Ns Ar fmt
1.39      kristaps  288: The string
                    289: .Ar fmt ,
1.49      kristaps  290: for example,
1.39      kristaps  291: .Ar ../html%S/%N.%S.html ,
                    292: is used as a template for linked manuals (usually via the
1.37      kristaps  293: .Sq \&Xr
1.57      kristaps  294: macro).
                    295: Instances of
1.43      kristaps  296: .Sq \&%N
1.40      kristaps  297: and
                    298: .Sq %S
                    299: are replaced with the linked manual's name and section, respectively.
1.57      kristaps  300: If no section is included, section 1 is assumed.
                    301: The default is not to
1.40      kristaps  302: present a hyperlink.
1.64      kristaps  303: .It Cm style Ns = Ns Ar style.css
1.58      kristaps  304: The file
                    305: .Ar style.css
                    306: is used for an external style-sheet.
                    307: This must be a valid absolute or
                    308: relative URI.
1.61      kristaps  309: .El
1.62      kristaps  310: .Ss PostScript Output
1.65      kristaps  311: PostScript
                    312: .Qq Adobe-3.0
                    313: Level-2 pages may be generated by
1.62      kristaps  314: .Fl T Ns Cm ps .
1.67      kristaps  315: Output pages default to letter sized and are rendered in the Times font
1.70      kristaps  316: family, 11-point.
                    317: Margins are calculated as 1/9 the page length and width.
1.71      kristaps  318: Line-height is 1.4m.
1.66      kristaps  319: .Pp
                    320: Special characters are rendered as in
                    321: .Sx ASCII Output .
                    322: .Pp
                    323: The following
                    324: .Fl O
                    325: arguments are accepted:
                    326: .Bl -tag -width Ds
                    327: .It Cm paper Ns = Ns Ar name
                    328: The paper size
                    329: .Ar name
                    330: may be one of
1.68      kristaps  331: .Ar a3 ,
                    332: .Ar a4 ,
                    333: .Ar a5 ,
                    334: .Ar legal ,
1.66      kristaps  335: or
                    336: .Ar letter .
1.68      kristaps  337: You may also manually specify dimensions as
                    338: .Ar NNxNN ,
                    339: width by height in millimetres.
                    340: If an unknown value is encountered,
                    341: .Ar letter
                    342: is used.
1.66      kristaps  343: .El
1.73      kristaps  344: .Ss PDF Output
                    345: PDF-1.1 output may be generated by
                    346: .Fl T Ns Cm pdf .
                    347: See
                    348: .Sx PostScript Output
                    349: for
                    350: .Fl O
                    351: arguments and defaults.
1.50      kristaps  352: .Ss XHTML Output
                    353: Output produced by
1.58      kristaps  354: .Fl T Ns Cm xhtml
1.50      kristaps  355: conforms to XHTML-1.0 strict.
                    356: .Pp
                    357: See
                    358: .Sx HTML Output
                    359: for details; beyond generating XHTML tags instead of HTML tags, these
                    360: output modes are identical.
1.77      schwarze  361: .Sh EXIT STATUS
                    362: The
                    363: .Nm
                    364: utility exits with one of the following values, controlled by the message
                    365: .Ar level
                    366: associated with the
                    367: .Fl W
                    368: option:
                    369: .Pp
                    370: .Bl -tag -width Ds -compact
                    371: .It 0
                    372: No warnings or errors occurred, or those that did were ignored because
                    373: they were lower than the requested
                    374: .Ar level .
                    375: .It 2
                    376: At least one warning occurred, but no error, and
                    377: .Fl W Ns Cm warning
                    378: was specified.
                    379: .It 3
                    380: At least one parsing error occurred, but no fatal error, and
                    381: .Fl W Ns Cm error
                    382: or
                    383: .Fl W Ns Cm warning
                    384: was specified.
                    385: .It 4
                    386: A fatal parsing error occurred.
                    387: .It 5
                    388: Invalid command line arguments were specified.
                    389: No input files have been read.
                    390: .It 6
                    391: An operating system error occurred, for example memory exhaustion or an
                    392: error accessing input files.
                    393: Such errors cause
                    394: .Nm
                    395: to exit at once, possibly in the middle of parsing or formatting a file.
                    396: .El
                    397: .Pp
                    398: Note that selecting
                    399: .Fl T Ns Cm lint
                    400: output mode implies
                    401: .Fl W Ns Cm warning .
1.1       kristaps  402: .Sh EXAMPLES
1.13      kristaps  403: To page manuals to the terminal:
1.1       kristaps  404: .Pp
1.82      kristaps  405: .Dl $ mandoc \-Wall,stop mandoc.1 2\*(Gt&1 | less
                    406: .Dl $ mandoc mandoc.1 mdoc.3 mdoc.7 | less
1.28      kristaps  407: .Pp
1.41      kristaps  408: To produce HTML manuals with
                    409: .Ar style.css
                    410: as the style-sheet:
1.38      kristaps  411: .Pp
1.82      kristaps  412: .Dl $ mandoc \-Thtml -Ostyle=style.css mdoc.7 \*(Gt mdoc.7.html
1.38      kristaps  413: .Pp
1.28      kristaps  414: To check over a large set of manuals:
                    415: .Pp
1.77      schwarze  416: .Dl $ mandoc \-Tlint `find /usr/src -name \e*\e.[1-9]`
1.66      kristaps  417: .Pp
                    418: To produce a series of PostScript manuals for A4 paper:
                    419: .Pp
1.82      kristaps  420: .Dl $ mandoc \-Tps \-Opaper=a4 mdoc.7 man.7 \*(Gt manuals.ps
1.77      schwarze  421: .Sh DIAGNOSTICS
                    422: Standard error messages reporting parsing errors are prefixed by
                    423: .Pp
                    424: .Sm off
                    425: .D1 Ar file : line : column : \ level :
                    426: .Sm on
                    427: .Pp
                    428: where the fields have the following meanings:
                    429: .Bl -tag -width "column"
                    430: .It Ar file
                    431: The name of the input file causing the message.
                    432: .It Ar line
                    433: The line number in that input file.
                    434: Line numbering starts at 1.
                    435: .It Ar column
                    436: The column number in that input file.
                    437: Column numbering starts at 1.
                    438: If the issue is caused by a word, the column number usually
                    439: points to the first character of the word.
                    440: .It Ar level
                    441: The message level, printed in capital letters.
                    442: .El
                    443: .Pp
                    444: Message levels have the following meanings:
                    445: .Bl -tag -width "warning"
                    446: .It Cm fatal
                    447: The parser is unable to parse a given input file at all.
                    448: No formatted output is produced from that input file.
                    449: .It Cm error
                    450: An input file contains syntax that cannot be safely interpreted,
                    451: either because it is invalid or because
                    452: .Nm
                    453: does not implement it yet.
                    454: By discarding part of the input or inserting missing tokens,
                    455: the parser is able to continue, and the error does not prevent
                    456: generation of formatted output, but typically, preparing that
                    457: output involves information loss, broken document structure
                    458: or unintended formatting.
                    459: .It Cm warning
                    460: An input file uses obsolete, discouraged or non-portable syntax.
                    461: All the same, the meaning of the input is unambiguous and a correct
                    462: rendering can be produced.
                    463: Documents causing warnings may render poorly when using other
                    464: formatting tools instead of
                    465: .Nm .
                    466: .El
                    467: .Pp
                    468: Messages of the
                    469: .Cm warning
                    470: and
                    471: .Cm error
                    472: levels are hidden unless their level, or a lower level, is requested using a
                    473: .Fl W
                    474: option or
                    475: .Fl T Ns Cm lint
                    476: output mode.
                    477: .Pp
                    478: The
                    479: .Nm
                    480: utility may also print messages related to invalid command line arguments
                    481: or operating system errors, for example when memory is exhausted or
1.78      schwarze  482: input files cannot be read.
                    483: Such messages do not carry the prefix described above.
1.20      kristaps  484: .Sh COMPATIBILITY
1.26      kristaps  485: This section summarises
1.20      kristaps  486: .Nm
1.76      kristaps  487: compatibility with GNU troff.
1.32      kristaps  488: Each input and output format is separately noted.
1.48      kristaps  489: .Ss ASCII Compatibility
1.37      kristaps  490: .Bl -bullet -compact
1.29      kristaps  491: .It
1.87      kristaps  492: Unrenderable unicode codepoints specified with
1.86      kristaps  493: .Sq \e[uNNNN]
                    494: escapes are printed as
                    495: .Sq \&?
                    496: in mandoc.
                    497: In GNU troff, these raise an error.
                    498: .It
1.49      kristaps  499: The
1.33      kristaps  500: .Sq \&Bd \-literal
1.49      kristaps  501: and
1.32      kristaps  502: .Sq \&Bd \-unfilled
                    503: macros of
                    504: .Xr mdoc 7
                    505: in
1.58      kristaps  506: .Fl T Ns Cm ascii
1.32      kristaps  507: are synonyms, as are \-filled and \-ragged.
1.26      kristaps  508: .It
1.86      kristaps  509: In historic GNU troff, the
1.27      kristaps  510: .Sq \&Pa
1.32      kristaps  511: .Xr mdoc 7
                    512: macro does not underline when scoped under an
1.30      kristaps  513: .Sq \&It
1.57      kristaps  514: in the FILES section.
                    515: This behaves correctly in
1.27      kristaps  516: .Nm .
                    517: .It
1.58      kristaps  518: A list or display following the
1.27      kristaps  519: .Sq \&Ss
1.32      kristaps  520: .Xr mdoc 7
                    521: macro in
1.58      kristaps  522: .Fl T Ns Cm ascii
1.20      kristaps  523: does not assert a prior vertical break, just as it doesn't with
1.27      kristaps  524: .Sq \&Sh .
1.20      kristaps  525: .It
1.32      kristaps  526: The
                    527: .Sq \&na
                    528: .Xr man 7
1.34      kristaps  529: macro in
1.58      kristaps  530: .Fl T Ns Cm ascii
1.34      kristaps  531: has no effect.
1.20      kristaps  532: .It
                    533: Words aren't hyphenated.
                    534: .El
1.50      kristaps  535: .Ss HTML/XHTML Compatibility
1.42      kristaps  536: .Bl -bullet -compact
                    537: .It
                    538: The
1.47      kristaps  539: .Sq \efP
                    540: escape will revert the font to the previous
                    541: .Sq \ef
                    542: escape, not to the last rendered decoration, which is now dictated by
1.57      kristaps  543: CSS instead of hard-coded.
                    544: It also will not span past the current scope,
                    545: for the same reason.
                    546: Note that in
1.47      kristaps  547: .Sx ASCII Output
                    548: mode, this will work fine.
                    549: .It
                    550: The
1.42      kristaps  551: .Xr mdoc 7
                    552: .Sq \&Bl \-hang
                    553: and
                    554: .Sq \&Bl \-tag
                    555: list types render similarly (no break following overreached left-hand
                    556: side) due to the expressive constraints of HTML.
                    557: .It
                    558: The
                    559: .Xr man 7
                    560: .Sq IP
                    561: and
                    562: .Sq TP
                    563: lists render similarly.
                    564: .El
1.1       kristaps  565: .Sh SEE ALSO
1.85      kristaps  566: .Xr eqn 7 ,
1.57      kristaps  567: .Xr man 7 ,
1.13      kristaps  568: .Xr mandoc_char 7 ,
1.84      kristaps  569: .Xr mdoc 7 ,
                    570: .Xr roff 7 ,
                    571: .Xr tbl 7
1.1       kristaps  572: .Sh AUTHORS
                    573: The
                    574: .Nm
1.26      kristaps  575: utility was written by
1.59      kristaps  576: .An Kristaps Dzonsons Aq kristaps@bsd.lv .
1.39      kristaps  577: .Sh CAVEATS
                    578: In
1.58      kristaps  579: .Fl T Ns Cm html
1.50      kristaps  580: and
1.58      kristaps  581: .Fl T Ns Cm xhtml ,
1.39      kristaps  582: the maximum size of an element attribute is determined by
                    583: .Dv BUFSIZ ,
1.57      kristaps  584: which is usually 1024 bytes.
                    585: Be aware of this when setting long link
1.58      kristaps  586: formats such as
                    587: .Fl O Ns Cm style Ns = Ns Ar really/long/link .
1.51      kristaps  588: .Pp
                    589: Nesting elements within next-line element scopes of
1.58      kristaps  590: .Fl m Ns Cm an ,
1.51      kristaps  591: such as
                    592: .Sq br
                    593: within an empty
                    594: .Sq B ,
                    595: will confuse
1.58      kristaps  596: .Fl T Ns Cm html
1.51      kristaps  597: and
1.58      kristaps  598: .Fl T Ns Cm xhtml
1.52      kristaps  599: and cause them to forget the formatting of the prior next-line scope.
1.53      kristaps  600: .Pp
1.54      kristaps  601: The
                    602: .Sq \(aq
1.55      kristaps  603: control character is an alias for the standard macro control character
                    604: and does not emit a line-break as stipulated in GNU troff.

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