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Diff for /mandoc/mdoc.7 between version 1.249 and 1.250

version 1.249, 2015/01/20 19:39:34 version 1.250, 2015/01/29 00:33:57
Line 3133  Manually switching the font using the
Line 3133  Manually switching the font using the
 font escape sequences is never required.  font escape sequences is never required.
 .Sh COMPATIBILITY  .Sh COMPATIBILITY
 This section provides an incomplete list of compatibility issues  This section provides an incomplete list of compatibility issues
 between mandoc and other troff implementations, at this time limited  between mandoc and GNU troff
 to GNU troff  
 .Pq Qq groff .  .Pq Qq groff .
 The term  
 .Qq historic groff  
 refers to groff versions before 1.17,  
 which featured a significant update of the  
 .Pa doc.tmac  
 file.  
 .Pp  .Pp
 Heirloom troff, the other significant troff implementation accepting  
 \-mdoc, is similar to historic groff.  
 .Pp  
 The following problematic behaviour is found in groff:  The following problematic behaviour is found in groff:
 .ds hist (Historic groff only.)  
 .Pp  .Pp
 .Bl -dash -compact  .Bl -dash -compact
 .It  .It
 Display macros  
 .Po  
 .Sx \&Bd ,  
 .Sx \&Dl ,  
 and  
 .Sx \&D1  
 .Pc  
 may not be nested.  
 \*[hist]  
 .It  
 .Sx \&At  
 with unknown arguments produces no output at all.  
 \*[hist]  
 Newer groff and mandoc print  
 .Qq AT&T UNIX  
 and the arguments.  
 .It  
 .Sx \&Bl Fl column  
 does not recognise trailing punctuation characters when they immediately  
 precede tabulator characters, but treats them as normal text and  
 outputs a space before them.  
 .It  
 .Sx \&Bd Fl ragged compact  
 does not start a new line.  
 \*[hist]  
 .It  
 .Sx \&Dd  .Sx \&Dd
 with non-standard arguments behaves very strangely.  with non-standard arguments behaves very strangely.
 When there are three arguments, they are printed verbatim.  When there are three arguments, they are printed verbatim.
Line 3185  but without any arguments the string
Line 3148  but without any arguments the string
 .Dq Epoch  .Dq Epoch
 is printed.  is printed.
 .It  .It
 .Sx \&Fl  
 does not print a dash for an empty argument.  
 \*[hist]  
 .It  
 .Sx \&Fn  
 does not start a new line unless invoked as the line macro in the  
 .Em SYNOPSIS  
 section.  
 \*[hist]  
 .It  
 .Sx \&Fo  
 with  
 .Pf non- Sx \&Fa  
 children causes inconsistent spacing between arguments.  
 In mandoc, a single space is always inserted between arguments.  
 .It  
 .Sx \&Ft  
 in the  
 .Em SYNOPSIS  
 causes inconsistent vertical spacing, depending on whether a prior  
 .Sx \&Fn  
 has been invoked.  
 See  
 .Sx \&Ft  
 and  
 .Sx \&Fn  
 for the normalised behaviour in mandoc.  
 .It  
 .Sx \&In  
 ignores additional arguments and is not treated specially in the  
 .Em SYNOPSIS .  
 \*[hist]  
 .It  
 .Sx \&It  
 sometimes requires a  
 .Fl nested  
 flag.  
 \*[hist]  
 In new groff and mandoc, any list may be nested by default and  
 .Fl enum  
 lists will restart the sequence only for the sub-list.  
 .It  
 .Sx \&Li  
 followed by a delimiter is incorrectly used in some manuals  
 instead of properly quoting that character, which sometimes works with  
 historic groff.  
 .It  
 .Sx \&Lk  .Sx \&Lk
 only accepts a single link-name argument; the remainder is misformatted.  only accepts a single link-name argument; the remainder is misformatted.
 .It  .It
Line 3245  can only be called by other macros, but not at the beg
Line 3161  can only be called by other macros, but not at the beg
 .Sx \&%C  .Sx \&%C
 is not implemented (up to and including groff-1.22.2).  is not implemented (up to and including groff-1.22.2).
 .It  .It
 Historic groff only allows up to eight or nine arguments per macro input  
 line, depending on the exact situation.  
 Providing more arguments causes garbled output.  
 The number of arguments on one input line is not limited with mandoc.  
 .It  
 Historic groff has many un-callable macros.  
 Most of these (excluding some block-level macros) are callable  
 in new groff and mandoc.  
 .It  
 .Sq \(ba  
 (vertical bar) is not fully supported as a delimiter.  
 \*[hist]  
 .It  
 .Sq \ef  .Sq \ef
 .Pq font face  .Pq font face
 and  and
Line 3275  The following features are unimplemented in mandoc:
Line 3178  The following features are unimplemented in mandoc:
 .Bl -dash -compact  .Bl -dash -compact
 .It  .It
 .Sx \&Bd  .Sx \&Bd
 .Fl file Ar file .  .Fl file Ar file
   is unsupported for security reasons.
 .It  .It
 .Sx \&Bd  .Sx \&Bd
   .Fl filled
   does not adjust the right margin, but is an alias for
   .Sx \&Bd
   .Fl ragged .
   .It
   .Sx \&Bd
   .Fl literal
   does not use a literal font, but is an alias for
   .Sx \&Bd
   .Fl unfilled .
   .It
   .Sx \&Bd
 .Fl offset Cm center  .Fl offset Cm center
 and  and
 .Fl offset Cm right .  .Fl offset Cm right
   don't work.
 Groff does not implement centered and flush-right rendering either,  Groff does not implement centered and flush-right rendering either,
 but produces large indentations.  but produces large indentations.
 .El  .El

Legend:
Removed from v.1.249  
changed lines
  Added in v.1.250

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