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Diff for /mandoc/TODO between version 1.131 and 1.240

version 1.131, 2012/05/27 15:20:12 version 1.240, 2017/07/19 21:48:37
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 * $Id$  * $Id$
 ************************************************************************  ************************************************************************
   
   Many issues are annotated for difficulty as follows:
   
    - loc = locality of the issue
       *    single file issue, affects file only, or very few
       **   single module issue, affects several files of one module
       ***  cross-module issue, significantly impacts multiple modules
            and may require substantial changes to internal interfaces
    - exist = difficulty of the existing code in this area
       *    affected code is straightforward and easy to read and change
       **   affected code is somewhat complex, but once you understand
            the design, not particularly difficult to understand
       ***  affected code uses a special, exceptionally tricky design
    - algo = difficulty of the new algorithm to be written
       *    the required logic and code is straightforward
       **   the required logic is somewhat complex and needs a careful design
       ***  the required logic is exceptionally tricky,
            maybe an approach to solve that is not even known yet
    - size = the amount of code to be written or changed
       *    a small number of lines (at most 100, usually much less)
       **   a considerable amount of code (several dozen to a few hundred)
       ***  a large amount of code (many hundreds, maybe thousands)
    - imp = importance of the issue
       *    mostly for completeness
       **   would be nice to have
       ***  issue causes considerable inconvenience
   
   Obviously, as the issues have not been solved yet, these annotations
   are mere guesses, and some may be wrong.
   
 ************************************************************************  ************************************************************************
 * missing features  * missing features
 ************************************************************************  ************************************************************************
   
 --- missing roff features ----------------------------------------------  --- missing roff features ----------------------------------------------
   
 - The pod2man preamble wants \h'...' with quoted numerical arguments,  
   see for example AUTHORS in MooseX::Getopt.3p, p5-MooseX-Getopt.  
   reported by Andreas Voegele <mail at andreasvoegele dot com>  
   Tue, 22 Nov 2011 15:34:47 +0100 on ports@  
   
 - .if n \{  
   .br\}  
   should cause an extra space to be raised.  
   
 - .ad (adjust margins)  - .ad (adjust margins)
   .ad l -- adjust left margin only (flush left)    .ad l -- adjust left margin only (flush left)
   .ad r -- adjust right margin only (flush right)    .ad r -- adjust right margin only (flush right)
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   .na   -- temporarily disable adjustment without changing the mode    .na   -- temporarily disable adjustment without changing the mode
   .ad   -- re-enable adjustment without changing the mode    .ad   -- re-enable adjustment without changing the mode
   Adjustment mode is ignored while in no-fill mode (.nf).    Adjustment mode is ignored while in no-fill mode (.nf).
     loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
   
 - .it (line traps) occur in mysql(1), yasm_arch(7)  - .fc (field control)
   generated by DocBook XSL Stylesheets v1.71.1 <http://docbook.sf.net/>    found by naddy@ in xloadimage(1)
   reported by brad@  Sat, 15 Jan 2011 15:48:18 -0500    loc **  exist ***  algo *  size *  imp *
   
   - .nr third argument (auto-increment step size, requires \n+)
     found by bentley@ in sbcl(1)  Mon, 9 Dec 2013 18:36:57 -0700
     loc *  exist *  algo *  size *  imp **
   
 - .ns (no-space mode) occurs in xine-config(1)  - .ns (no-space mode) occurs in xine-config(1)
     when implementing this, also let .TH set it
   reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500    reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500
     loc ***  exist ***  algo ***  size **  imp *
   
 - xloadimage(1) wants .ti (temporary indent), rep by naddy@  - .while and .shift
   reported again by bentley@ in nmh(1)  Mon, 23 Apr 2012 13:38:28 -0600    found by jca@ in ratpoison(1)  Sun, 30 Jun 2013 12:01:09 +0200
   also uses .ce (center N lines) and .fc (field control)    loc *  exist **  algo **  size **  imp **
   
 - .ta (tab settings) occurs in ircbug(1) and probably gnats(1)  - \n+ and \n- numerical register increment and decrement
   reported by brad@  Sat, 15 Jan 2011 15:50:51 -0500    found by bentley@ in sbcl(1)  Mon, 9 Dec 2013 18:36:57 -0700
     loc *  exist *  algo *  size *  imp **
   
 - \c (interrupted text) occurs in chat(8)  - \w'' improve width measurements
     would not be very useful without an expression parser, see below
     needed for Tcl_NewStringObj(3) via wiz@  Wed, 5 Mar 2014 22:27:43 +0100
     loc **  exist ***  algo ***  size *  imp ***
   
   - \\ in high-level macro arguments
     Currently, \\ is expanded in two situations:
     1) macro and string definition (roff.c setstrn())
     2) macro argument parsing (mandoc.c mandoc_getarg())
     For user defined macros, the second happens in time because of ROFF_REPARSE.
     But for standard high-level macros, it only happens after entering the
     high level parsers, which is too late because the code doesn't get
     back to roff.c roff_res() from that point.  Because this requires
     distinguishing requests, user-defined macros and standard macros
     on the roff_res() level, it is hard to solve without the parser reorg.
     Found by naddy@ in devel/cutils cobfusc(1)  Mon, 16 Feb 2015 19:10:52 +0100
     loc ***  exist ***  algo ***  size **  imp *
   
 - using undefined strings or macros defines them to be empty  - using undefined strings or macros defines them to be empty
   wl@  Mon, 14 Nov 2011 14:37:01 +0000    wl@  Mon, 14 Nov 2011 14:37:01 +0000
     loc *  exist *  algo *  size *  imp *
   
 --- missing mdoc features ----------------------------------------------  --- missing mdoc features ----------------------------------------------
   
 - fix bad block nesting involving multiple identical explicit blocks  
   see the OpenBSD mdoc_macro.c 1.47 commit message  
   
 - .Bl -column .Xo support is missing  - .Bl -column .Xo support is missing
   ultimate goal:    ultimate goal:
   restore .Xr and .Dv to    restore .Xr and .Dv to
   lib/libc/compat-43/sigvec.3    lib/libc/compat-43/sigvec.3
   lib/libc/gen/signal.3    lib/libc/gen/signal.3
   lib/libc/sys/sigaction.2    lib/libc/sys/sigaction.2
     loc *  exist ***  algo ***  size *  imp **
   
 - edge case: decide how to deal with blk_full bad nesting, e.g.  - edge case: decide how to deal with blk_full bad nesting, e.g.
   .Sh .Nm .Bk .Nm .Ek .Sh found by jmc@ in ssh-keygen(1)    .Sh .Nm .Bk .Nm .Ek .Sh found by jmc@ in ssh-keygen(1)
   from jmc@  Wed, 14 Jul 2010 18:10:32 +0100    from jmc@  Wed, 14 Jul 2010 18:10:32 +0100
     loc *  exist ***  algo ***  size **  imp **
   
 - \\ is now implemented correctly  - .Bd -centered implies -filled, not -unfilled, which is not
   * when defining strings and macros using .ds and .de    easy to implement; it requires code similar to .ce, which
   * when parsing roff(7) and man(7) macro arguments    we don't have either.
   It does not yet work in mdoc(7) macro arguments    Besides, groff has bug causing text right *before* .Bd -centered
   because libmdoc does not yet use mandoc_getarg().    to be centered as well.
   Also check what happens in plain text, it must be identical to \e.    loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
   
 - .Bd -filled should not be the same as .Bd -ragged, but align both  - .Bd -filled should not be the same as .Bd -ragged, but align both
   the left and right margin.  In groff, it is implemented in terms    the left and right margin.  In groff, it is implemented in terms
   of .ad b, which we don't have either.  Found in cksum(1).    of .ad b, which we don't have either.  Found in cksum(1).
     loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
   
 - implement blank `Bl -column', such as  - implement blank `Bl -column', such as
   .Bl -column    .Bl -column
   .It foo Ta bar    .It foo Ta bar
   .El    .El
     loc *  exist ***  algo ***  size *  imp *
   
 - explicitly disallow nested `Bl -column', which would clobber internal  - explicitly disallow nested `Bl -column', which would clobber internal
   flags defined for struct mdoc_macro    flags defined for struct mdoc_macro
     loc *  exist *  algo *  size *  imp **
   
 - In .Bl -column .It, the end of the line probably has to be regarded  - In .Bl -column .It, the end of the line probably has to be regarded
   as an implicit .Ta, if there could be one, see the following mildly    as an implicit .Ta, if there could be one, see the following mildly
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     Default search path.      Default search path.
   reported by Michal Mazurek <akfaew at jasminek dot net>    reported by Michal Mazurek <akfaew at jasminek dot net>
   via jmc@ Thu, 7 Apr 2011 16:00:53 +0059    via jmc@ Thu, 7 Apr 2011 16:00:53 +0059
     loc *  exist ***  algo **  size *  imp **
   
 - inside `.Bl -column' phrases, punctuation is handled like normal  - inside `.Bl -column' phrases, punctuation is handled like normal
   text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."    text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."
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   is not safe, e.g. `.Bl -column .It Pf a b .' gives "ab."    is not safe, e.g. `.Bl -column .It Pf a b .' gives "ab."
   but should give "ab ."    but should give "ab ."
   
 - set a meaningful default if no `Bl' list type is assigned  - check whether it is correct that `D1' uses INDENT+1;
     does it need its own constant?
     loc *  exist **  algo **  size *  imp **
   
 - have a blank `It' head for `Bl -tag' not puke  
   
 - prohibit `Nm' from having non-text HEAD children  - prohibit `Nm' from having non-text HEAD children
   (e.g., NetBSD mDNSShared/dns-sd.1)    (e.g., NetBSD mDNSShared/dns-sd.1)
   (mdoc_html.c and mdoc_term.c `Nm' handlers can be slightly simplified)    (mdoc_html.c and mdoc_term.c `Nm' handlers can be slightly simplified)
   
   - support translated section names
     e.g. x11/scrotwm scrotwm_es.1:21:2: error: NAME section must be first
     that one uses NOMBRE because it is spanish...
     deraadt tends to think that section-dependent macro behaviour
     is a bad idea in the first place, so this may be irrelevant
     loc **  exist **  algo **  size *  imp **
   
 - When there is free text in the SYNOPSIS and that free text contains  - When there is free text in the SYNOPSIS and that free text contains
   the .Nm macro, groff somehow understands to treat the .Nm as an in-line    the .Nm macro, groff somehow understands to treat the .Nm as an in-line
   macro, while mandoc treats it as a block macro and breaks the line.    macro, while mandoc treats it as a block macro and breaks the line.
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   should be, needs investigation.    should be, needs investigation.
   uqs@  Thu, 2 Jun 2011 11:03:51 +0200    uqs@  Thu, 2 Jun 2011 11:03:51 +0200
   uqs@  Thu, 2 Jun 2011 11:33:35 +0200    uqs@  Thu, 2 Jun 2011 11:33:35 +0200
     loc *  exist **  algo ***  size *  imp **
   
 --- missing man features -----------------------------------------------  --- missing tbl features -----------------------------------------------
   
 - groff an-ext.tmac macros (.UR, .UE) occur in xine(5)  - the "s" layout column specifier is used for placement of data
   reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500    into columns, but ignored during column width calculations
     synaptics(4) found by tedu@  Mon, 17 Aug 2015 21:17:42 -0400
     loc *  exist **  algo ***  size *  imp **
   
 - -T[x]html doesn't stipulate non-collapsing spaces in literal mode  - support mdoc(7) and man(7) macros inside tbl(7) code;
     probably requires the parser reorg and letting tbl(7)
     use roff_node such that macro sets can mix;
     informed by bapt@ that FreeBSD needs this: 3 Jan 2015 23:32:23 +0100
     loc ***  exist **  algo ***  size **  imp ***
   
 --- missing tbl features -----------------------------------------------  - look at the POSIX manuals in the books/man-pages-posix port,
     they use some unsupported tbl(7) features.
     loc *  exist **  algo **  size **  imp ***
   
 - implement basic non-parametric .de to support e.g. sox(1)  - look what Joerg Schilling manual pages use
   reported by naddy@ Sat, 16 Oct 2010 23:51:57 +0200    Thu, 19 Mar 2015 18:31:48 +0100
   *** sox(1) still doesn't work, tbl(1) errors need investigation  
   
 - allow standalone `.' to be interpreted as an end-of-layout  - use Unicode U+2500 to U+256C for table borders
   delimiter instead of being thrown away as a no-op roff line    in tbl(7) -Tutf-8 output
   reported by Yuri Pankov, Wed 18 May 2011 11:34:59 CEST    suggested by bentley@  Tue, 14 Oct 2014 04:10:55 -0600
     loc *  exist **  algo *  size *  imp **
   
   --- missing eqn features -----------------------------------------------
   
   - In a matrix, break the output line after each matrix line.
     Found in the discussion at CDBUG 2015.
     Suggested by Avi Weinstock.
     loc *  exist *  algo *  size *  imp **
   
   - The "size" keyword is parsed, but ignored by the formatter.
     loc *  exist *  algo *  size *  imp *
   
   - The spacing characters `~', `^', and tab are currently ignored,
     see User's Guide (Second Edition) page 2 section 4.
     loc *  exist *  algo **  size *  imp **
   
   - Mark and lineup are parsed and ignored,
     see User's Guide (Second Edition) page 5 section 15.
     loc **  exist **  algo **  size **  imp **
   
   - GNU eqn converts some operators to special characters, for example,
     input HYPHEN-MINUS becomes output \(mi, unless it is part of a
     quoted word.  mandoc(1) only does this when the operator is
     surrounded by blanks, not when it is part of an unquoted word.
     Also, check whether there are more such cases (e.g., +?).
     reported by bentley@  20 Jun 2017 02:04:29 -0600
   
   - Primes, opprime, and '
     bentley@  Thu, 13 Jul 2017 23:14:20 -0600
   
 --- missing misc features ----------------------------------------------  --- missing misc features ----------------------------------------------
   
   - italic correction (\/) in PostScript mode
     Werner LEMBERG on groff at gnu dot org  Sun, 10 Nov 2013 12:47:46
     loc **  exist **  algo *  size *  imp *
   
   - change the default PAGER to more -Es and use the pager
     even for apropos title line output; req by bapt@
     loc *  exist *  algo *  size *  imp ***
   
 - clean up escape sequence handling, creating three classes:  - clean up escape sequence handling, creating three classes:
   (1) fully implemented, or parsed and ignored without loss of content    (1) fully implemented, or parsed and ignored without loss of content
   (2) unimplemented, potentially causing loss of content    (2) unimplemented, potentially causing loss of content
       or serious mangling of formatting (e.g. \n) -> ERROR        or serious mangling of formatting (e.g. \n) -> ERROR
       see textproc/mgdiff(1) for nice examples        see textproc/mgdiff(1) for nice examples
   (3) undefined, just output the character -> perhaps WARNING    (3) undefined, just output the character -> perhaps WARNING
     loc ***  exist **  algo **  size **  imp *** (parser reorg helps)
   
 - The \t escape sequence is the same as a literal tab, see for example  - kettenis wants base roff, ms, and me  Fri, 1 Jan 2010 22:13:15 +0100 (CET)
   the ASCII table in hexdump(1) where    loc **  exist **  algo **  size ***  imp *
     .Bl -column \&000_nu \&001_so \&002_st \&003_et \&004_eo  
     .It \&000\ nul\t001\ soh\t002\ stx\t003\ etx\t004\ eot\t005\ enq  
   produces  
     000 nul  001 soh  002 stx  003 etx  004 eot  005 enq  
   and the example in oldrdist(1)  
   
   --- compatibility checks -----------------------------------------------
   
   - is .Bk implemented correctly in modern groff?
     sobrado@  Tue, 19 Apr 2011 22:12:55 +0200
   
   - compare output to Heirloom roff, Solaris roff, and
     http://repo.or.cz/w/neatroff.git  http://litcave.rudi.ir/
   
   - look at AT&T DWB http://www2.research.att.com/sw/download
     Carsten Kunze <carsten dot kunze at arcor dot de> has patches
     Mon, 4 Aug 2014 17:01:28 +0200
     ported version: https://github.com/n-t-roff/DWB3.3
     Carsten Kunze  Wed, 22 Apr 2015 11:21:43 +0200
   
 - look at pages generated from reStructeredText, e.g. devel/mercurial hg(1)  - look at pages generated from reStructeredText, e.g. devel/mercurial hg(1)
   These are a weird mixture of man(7) and custom autogenerated low-level    These are a weird mixture of man(7) and custom autogenerated low-level
   roff stuff.  Figure out to what extent we can cope.    roff stuff.  Figure out to what extent we can cope.
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   noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200    noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200
   reminded by nicm@  Mon, 3 May 2010 09:52:41 +0100    reminded by nicm@  Mon, 3 May 2010 09:52:41 +0100
   
   - look at pages generated from ronn(1) github.com/rtomayko/ronn
     (based on markdown)
   
   - look at pages generated from Texinfo source by yat2m, e.g. security/gnupg
     First impression is not that bad.
   
   - look at pages generated by pandoc; see
     https://github.com/jgm/pandoc/blob/master/src/Text/Pandoc/Writers/Man.hs
     porting planned by kili@  Thu, 19 Jun 2014 19:46:28 +0200
   
 - check compatibility with Plan9:  - check compatibility with Plan9:
   http://swtch.com/usr/local/plan9/tmac/tmac.an    http://swtch.com/usr/local/plan9/tmac/tmac.an
   http://swtch.com/plan9port/man/man7/man.html    http://swtch.com/plan9port/man/man7/man.html
   "Anthony J. Bentley" <anthonyjbentley@gmail.com> 28 Dec 2010 21:58:40 -0700    "Anthony J. Bentley" <anthonyjbentley@gmail.com> 28 Dec 2010 21:58:40 -0700
   
   - check compatibility with COHERENT troff:
     http://www.nesssoftware.com/home/mwc/source.php
   
   - check compatibility with the man(7) formatter
     https://raw.githubusercontent.com/rofl0r/hardcore-utils/master/man.c
   
   - check compatibility with
     http://ikiwiki.info/plugins/contrib/mandoc/
     https://github.com/schmonz/ikiwiki/compare/mandoc
     Amitai Schlair  Mon, 19 May 2014 14:05:53 -0400
   
   - check features of the Slackware man.conf(5) format
     Carsten Kunze  Wed, 11 Mar 2015 17:57:24 +0100
   
 ************************************************************************  ************************************************************************
 * formatting issues: ugly output  * formatting issues: ugly output
 ************************************************************************  ************************************************************************
   
 - a column list with blank `Ta' cells triggers a spurrious  - revisit empty in-line macros
     look at the difference between "Em x Em ." and "Sq x Em ."
     Carsten Kunze  Fri, 12 Dec 2014 00:15:41 +0100
     loc *** exist *** algo *** size * imp **
   
   - a column list with blank `Ta' cells triggers a spurious
   start-with-whitespace printing of a newline    start-with-whitespace printing of a newline
   
 - double quotes inside double quotes are escaped by doubling them  - In .Bl -column, .It a<tab>"b<tab>c"
   implement this in mdoc(7), too    shows the quotes in groff, but not in mandoc
   so far, we only have it in roff(7) and man(7)    loc * exist *** algo ** size * imp **
   reminded by millert@  Thu, 09 Dec 2010 17:29:52 -0500  
   
 - perl(1) SYNOPSIS looks bad; reported by deraadt@  
   1) man(7) seems to need SYNOPSIS .Nm blocks, too  
   
 - In .Bl -column,  - In .Bl -column,
   .It Em Authentication<tab>Key Length    .It Em Authentication<tab>Key Length
   ought to render "Key Length" with emphasis, too,    ought to render "Key Length" with emphasis, too,
   see OpenBSD iked.conf(5).    see OpenBSD iked.conf(5).
   reported again Nicolas Joly via wiz@ Wed, 12 Oct 2011 00:20:00 +0200    reported again Nicolas Joly via wiz@ Wed, 12 Oct 2011 00:20:00 +0200
     loc *  exist ***  algo ***  size **  imp ***
   
 - empty phrases in .Bl column produce too few blanks  - empty phrases in .Bl column produce too few blanks
   try e.g. .Bl -column It Ta Ta    try e.g. .Bl -column It Ta Ta
   reported by millert Fri, 02 Apr 2010 16:13:46 -0400    reported by millert Fri, 02 Apr 2010 16:13:46 -0400
     loc *  exist ***  algo ***  size *  imp **
   
 - .%T can have trailing punctuation.  Currently, it puts the trailing  - .%T can have trailing punctuation.  Currently, it puts the trailing
   punctuation into a trailing MDOC_TEXT element inside its own scope.    punctuation into a trailing MDOC_TEXT element inside its own scope.
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   slurp all arguments into one single text element - and one feature    slurp all arguments into one single text element - and one feature
   of in_line() - put trailing punctuation out of scope.    of in_line() - put trailing punctuation out of scope.
   Found in mount_nfs(8) and exports(5), search for "Appendix".    Found in mount_nfs(8) and exports(5), search for "Appendix".
     loc **  exist **  algo ***  size *  imp **
   
   - Trailing punctuation after .%T triggers EOS spacing, at least
     outside .Rs (eek!).  Simply setting ARGSFL_DELIM for .%T is not
     the right solution, it sends mandoc into an endless loop.
     reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
     loc *  exist **  algo **  size *  imp **
   
   - global variables in the SYNOPSIS of section 3 pages
     .Vt vs .Vt/.Va vs .Ft/.Va vs .Ft/.Fa ...
     from kristaps@  Tue, 08 Jun 2010 11:13:32 +0200
   
   - implicit whitespace around inline equations
     example code:  where '$times$' denotes matrix multiplication
     must not have an HTML line break, nor a blank, before <math>
     partial solution: html.c {"math", HTML_NLINSIDE | HTML_INDENT},
     bentley@  Thu, 13 Jul 2017 19:00:59 -0600
   
 - in enclosures, mandoc sometimes fancies a bogus end of sentence  - in enclosures, mandoc sometimes fancies a bogus end of sentence
   reminded by jmc@  Thu, 23 Sep 2010 18:13:39 +0059    reminded by jmc@  Thu, 23 Sep 2010 18:13:39 +0059
     loc *  exist **  algo ***  size *  imp ***
   
   - a line starting with "\fB something" counts as starting with whitespace
     and triggers a line break; found in audio/normalize-mp3(1)
     loc **  exist *  algo **  size *  imp **
   
   - formatting /usr/local/man/man1/latex2man.1 with groff and mandoc
     reveals lots of bugs both in groff and mandoc...
     reported by bentley@  Wed, 22 May 2013 23:49:30 -0600
   
   --- PostScript and PDF issues ------------------------------------------
   
   - PDF output doesn't use a monospaced font for .Bd -literal
     Example: "mandoc -Tpdf afterboot.8 > output.pdf && pdfviewer output.pdf".
     Search the text "Routing tables".
     Also check what PostScript mode does when fixing this.
     reported by juanfra@ Wed, 04 Jun 2014 21:44:58 +0200
     instructions from juanfra@  Wed, 11 Jun 2014 02:21:01 +0200
       add a new <</Type /Font>> block to the PDF files with /BaseFont /Courier
       and change the /Name from /F0 to the new font (/F5 (?)).
     re-reported by tb@ Mon, 16 Mar 2015 16:47:21 +0100
     loc *  exist **  algo **  size *  imp **
   
   --- HTML issues --------------------------------------------------------
   
   - .Bf at the beginning of a paragraph inserts a bogus 1ex horizontal
     space, see for example random(3).  Introduced in
     http://mdocml.bsd.lv/cgi-bin/cvsweb/mdoc_html.c.diff?r1=1.91&r2=1.92
     reported by deraadt@ Mon, 28 Sep 2015 20:14:13 -0600 (MDT)
     loc **  exist **  algo **  size *  imp *
   
   - jsg on icb, Nov 3, 2014:
     try to guess Xr in man(7) for hyperlinking
     and render them with <a class="Xr" href=...>
     https://github.com/Debian/debiman/issues/15
     loc *  exist *  algo **  size **  imp **
   
   - The tables used to render the three-part page headers actually force
     the width of the <body> to the max-width given for <html>.
     Not yet sure how to fix that...
     Observed by an Anonymous Coward on undeadly.org:
     http://undeadly.org/cgi?action=article&sid=20140925064244&pid=1
     loc *  exist *  algo **  size *  imp ***
   
   - generate <img> tags in HTML
     idea from florian@  Tue, 7 Apr 2015 00:26:28 +0000
     may be possible to implement with .Lk img://something.png alt_text
   
   - check https://github.com/trentm/mdocml
   
 ************************************************************************  ************************************************************************
 * formatting issues: gratuitous differences  * formatting issues: gratuitous differences
 ************************************************************************  ************************************************************************
   
 - .Rv (and probably .Ex) print different text if an `Nm' has been named  - .Fn reopens a new scope after punctuation in mandoc,
   or not (run a manual without `Nm blah' to see this).  I'm not sure    but closes its scope for good in groff.
   that this exists in the wild, but it's still an error.    Do we want to change mandoc or groff?
     Steffen Nurpmeso  Sat, 08 Nov 2014 13:34:59 +0100
     loc *  exist **  algo **  size *  imp **
   
 - In .Bl -bullet, the groff bullet is "+\b+\bo\bo", the mandoc bullet  - In .Bl -enum -width 0n, groff continues one the same line after
   is just "o\bo".    the number, mandoc breaks the line.
   see for example OpenBSD ksh(1)    mail to kristaps@  Mon, 20 Jul 2009 02:21:39 +0200
     loc *  exist **  algo **  size *  imp **
   
 - The characters "|" and "\*(Ba" should never be bold,  
   not even in the middle of a word, e.g. ".Cm b\*(Bac" in  
   "mknod [-m mode] name b|c major minor"  
   in OpenBSD ksh(1)  
   
 - A bogus .Pp between two .It must not produce a double blank line,  
   see between -R and -r in OpenBSD rm(1), before "update" in mount(8),  
   or in DIAGNOSTICS in init(8), or before "is always true" in ksh(1).  
   The same happens with .Pp just before .El, see bgpd.conf(5).  
   Also have `It' complain if `Pp' is invoked at certain times (not  
   -compact?).  
   
 - .Pp between two .It in .Bl -column should produce one,  - .Pp between two .It in .Bl -column should produce one,
   not two blank lines, see e.g. login.conf(5).    not two blank lines, see e.g. login.conf(5).
   reported by jmc@  Sun, 17 Apr 2011 14:04:58 +0059    reported by jmc@  Sun, 17 Apr 2011 14:04:58 +0059
   reported again by sthen@  Wed, 18 Jan 2012 02:09:39 +0000 (UTC)    reported again by sthen@  Wed, 18 Jan 2012 02:09:39 +0000 (UTC)
     loc *  exist ***  algo **  size *  imp **
   
 - If the *first* line after .It is .Pp, break the line right after  - If the *first* line after .It is .Pp, break the line right after
   the tag, do not pad with space characters before breaking.    the tag, do not pad with space characters before breaking.
   See the description of the a, c, and i commands in sed(1).    See the description of the a, c, and i commands in sed(1).
     loc *  exist **  algo **  size *  imp **
   
 - If the first line after .It is .D1, do not assert a blank line  - If the first line after .It is .D1, do not assert a blank line
   in between, see for example tmux(1).    in between, see for example tmux(1).
   reported by nicm@  13 Jan 2011 00:18:57 +0000    reported by nicm@  13 Jan 2011 00:18:57 +0000
     loc *  exist **  algo **  size *  imp **
   
   - Trailing punctuation after .It should trigger EOS spacing.
     reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
     Probably, this should be fixed somewhere in termp_it_pre(), not sure.
     loc *  exist **  algo **  size *  imp **
   
 - .Nx 1.0a  - .Nx 1.0a
   should be "NetBSD 1.0A", not "NetBSD 1.0a",    should be "NetBSD 1.0A", not "NetBSD 1.0a",
   see OpenBSD ccdconfig(8).    see OpenBSD ccdconfig(8).
     loc *  exist *  algo *  size *  imp **
   
 - In .Bl -tag, if a tag exceeds the right margin and must be continued  - In .Bl -tag, if a tag exceeds the right margin and must be continued
   on the next line, it must be indented by -width, not width+1;    on the next line, it must be indented by -width, not width+1;
   see "rule block|pass" in OpenBSD ifconfig(8).    see "rule block|pass" in OpenBSD ifconfig(8).
     loc *  exist ***  algo **  size *  imp **
   
 - When the -width string contains macros, the macros must be rendered  - When the -width string contains macros, the macros must be rendered
   before measuring the width, for example    before measuring the width, for example
Line 249 
Line 453 
   as -width 7n, not -width 11n.    as -width 7n, not -width 11n.
   The same applies to .Bl -column column widths;    The same applies to .Bl -column column widths;
   reported again by Nicolas Joly Thu, 1 Mar 2012 13:41:26 +0100 via wiz@ 5 Mar    reported again by Nicolas Joly Thu, 1 Mar 2012 13:41:26 +0100 via wiz@ 5 Mar
     reported again by Franco Fichtner Fri, 27 Sep 2013 21:02:28 +0200
     reported again by Bruce Evans Fri, 17 Feb 2017 21:22:44 +0100 via bapt@
     loc ***  exist ***  algo ***  size **  imp ***
     An easy partial fix would be to just skip the first word if it starts
     with a dot, including any following white space, when measuring.
     loc *  exist *  algo *  size *  imp ***
   
 - The \& zero-width character counts as output.  - The \& zero-width character counts as output.
   That is, when it is alone on a line between two .Pp,    That is, when it is alone on a line between two .Pp,
   we want three blank lines, not two as in mandoc.    we want three blank lines, not two as in mandoc.
     loc **  exist **  algo **  size *  imp **
   
 - When .Fn arguments exceed one output line, all but the first  - Sequences of multiple man(7) paragraphs (.PP, .IP) interspersed
   should be indented, see e.g. rpc(3);    with .ps and .nf/.fi produce execessive blank lines, see libJudy
   reported by jmc@ on discuss@  Fri, 29 Oct 2010 13:48:33 +0100    and graphics/dcmtk.  The parser reorg may help with this.
   reported again by Nicolas Joly via wiz@  Sun, 18 Sep 2011 18:24:40 +0200  
   Also, we don't want to break the line within the argument of:  
   .Fa "chtype tl"  
   
 - .Ns should work when called at the end of an input line, see  
   the following code in vi(1):  
     .It Xo  
     .Op Ar line  
     .Cm a Ns Op Cm ppend Ns  
     .Op Cm !\&  
     .Xc  
     The input text is appended after the specified line.  
   
 - Header lines of excessive length:  
   Port OpenBSD man_term.c rev. 1.25 to mdoc_term.c  
   and document it in mdoc(7) and man(7) COMPATIBILITY  
   found while talking to Chris Bennett  
   
 - In man(7), the sequence  
     .HP  
     one line of regular text  
     .SH  
   should not produce two blank lines before the .SH,  
   see for example named-checkconf(8).  
   
 - In man(7), the sequence  
     .SH HEADER  
     <blank line>  
     .PP  
     regular text  
   should not produce any blank lines between the header and the text,  
   see for example rsync(1).  
   Reported by naddy@  Mon, 28 Mar 2011 20:45:42 +0200  
   
 - In man(7), the sequence  
     regular text  
     .IP  
     .IP "tag"  
     indented text  
   should produce one, not four blank lines between the regular text  
   and the tag, see for example rsync(1).  
   Likewise,  
     regular text  
     .IP  
     indented text  
   should produce one, not two blank lines in between, and  
     regular text  
     .IP  
     .RS  
     .IP tag  
     indented text  
   should produce one, not three blank lines.  
   Reported by naddy@  Mon, 28 Mar 2011 20:45:42 +0200  
   
 - trailing whitespace must be ignored even when followed by a font escape,  - trailing whitespace must be ignored even when followed by a font escape,
   see for example    see for example
     makes      makes
     \fBdig \fR      \fBdig \fR
     operate in batch mode      operate in batch mode
   in dig(1).    in dig(1).
     loc **  exist **  algo **  size *  imp **
   
 ************************************************************************  ************************************************************************
 * error reporting issues  * warning issues
 ************************************************************************  ************************************************************************
   
 - .TP directly followed by .RS gives an assertion.  - warn when .Sh or .Ss contain other macros
     Steffen Nurpmeso, savannah.gnu.org/bugs/index.php?45034
     loc *  exist *  algo *  size *  imp **
   
   - warn about attempts to call non-callable macros
     Steffen Nurpmeso  Tue, 11 Nov 2014 22:55:16 +0100
     Note that formatting is inconsistent in groff.
     .Fn Po prints "Po()", .Ar Sh prints "file ..." and no "Sh".
     Relatively hard because the relevant code is scattered
     all over mdoc_macro.c and all subtly different.
     loc **  exist **  algo **  size **  imp **
   
   - mandoc_special does not really check the escape sequence,
     but just the overall format
     loc **  exist **  algo ***  size **  imp **
   
   - -Tlint parser errors and warnings to stdout
     to tech@mdocml, naddy@  Wed, 28 Sep 2011 11:21:46 +0200
     wait!  kristaps@  Sun, 02 Oct 2011 17:12:52 +0200
   
 ************************************************************************  ************************************************************************
 * performance issues  * documentation issues
 ************************************************************************  ************************************************************************
   
 Several areas can be cleaned up to make mandoc even faster.  These are  - mark macros as: page structure domain, manual domain, general text domain
     is this useful?
   
 - improve hashing mechanism for macros (quite important: performance)  - mention /usr/share/misc/mdoc.template in mdoc(7)?
   
 - improve hashing mechanism for characters (not as important)  - Is all the content from http://www.std.com/obi/BSD/doc/usd/28.tbl/tbl
     covered in tbl(7)?
   
 - the PDF file is HUGE: this can be reduced by using relative offsets  ************************************************************************
   * performance issues
   ************************************************************************
   
 - instead of re-initialising the roff predefined-strings set before each  - Why are we using MAP_SHARED, not MAP_PRIVATE for mmap(2)?
   parse, create a read-only version the first time and copy it    from kristaps@  Sat, 09 Aug 2014 13:51:36 +0200
   
   Several areas can be cleaned up to make mandoc even faster.  These are
   
   - the PDF file is HUGE: this can be reduced by using relative offsets
   
 ************************************************************************  ************************************************************************
 * structural issues  * structural issues
 ************************************************************************  ************************************************************************
   
   - POSIX says in the documentation of sysconf(3) that PATH_MAX
     is allowed to be so large that it is a bad idea to use it
     for sizing static buffers.  So use dynamic buffers throughout.
     See the file test-PATH_MAX.c for details.
     Found by Aaron M. Ucko in the GNU Hurd via Bdale Garbee,
     https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829624
   
 - We use the input line number at several places to distinguish  - We use the input line number at several places to distinguish
   same-line from different-line input.  That plainly doesn't work    same-line from different-line input.  That plainly doesn't work
   with user-defined macros, leading to random breakage.    with user-defined macros, leading to random breakage.
   
 - Find better ways to prevent endless loops  - Find better ways to prevent endless loops
   in roff(7) macro and string expansion.    in roff(7) macro and string expansion.
   
 - Finish cleanup of date handling.  - struct mparse refactoring
   Decide which formats should be recognized where.    Steffen Nurpmeso  Thu, 04 Sep 2014 12:50:00 +0200
   Update both mdoc(7) and man(7) documentation.  
   Triggered by  Tim van der Molen  Tue, 22 Feb 2011 20:30:45 +0100  ************************************************************************
   * CGI issues
   ************************************************************************
   
    - Enable HTTP compression by detecting gzip encoding and filtering
      output through libz.
    - Sandbox (see OpenSSH).
    - Enable caching support via HTTP 304 and If-Modified-Since.
    - Have Mac OSX systems automatically disable -static compilation of the
      CGI: -static isn't supported.
   
   ************************************************************************
   * to improve in the groff_mdoc(7) macros
   ************************************************************************
   
   - use uname(1) to set doc-default-operating-system at install time
     tobimensch  Mon, 1 Dec 2014 00:25:07 +0100
   
   - apostrophe (39), circumflex (94), grave (96), tilde (126)
     in manuals: \(aq, \(ha, \`, \(ti
     Re: [Groff] ASCII Minus Sign in man Pages.
     bentley@ 26 Apr 2017 10:02:06 -0600
     Do we need to fix existing manuals?
     Do we need to fix the definition of the mdoc(7) language?

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