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Diff for /mandoc/TODO between version 1.28 and 1.219

-version 1.28, 2010/07/18 16:42:03
+version 1.219, 2016/07/19 21:31:55
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  ************************************************************************
- * Official mandoc TODO.  May not be quite up to date.
+ * Official mandoc TODO.
  * $Id$
  ************************************************************************
+ 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.
  ************************************************************************
+ * crashes
+ ************************************************************************
+ - The abort() in bufcat(), html.c, can be triggered via buffmt_includes()
+   by running -Thtml -Oincludes on a file containing a long .In argument.
+   Fixing this will probably require reworking the whole bufcat() concept.
+   loc **  exist *  algo *  size **  imp **
+ ************************************************************************
  * missing features
  ************************************************************************
- - explicit blocks with missing end macro should be implicitely closed
+ --- missing roff features ----------------------------------------------
-   at the end of the enclosing block, e.g. .Bl It (El) Sh
-   reminded by stsp@  in net/pptp pptp.8  Fri, 23 Apr 2010 20:32:39 +0200
- - fix bad block nesting involving multiple identical explicit blocks
+ - .ad (adjust margins)
-   see the OpenBSD mdoc_macro.c 1.47 commit message
+   .ad l -- adjust left margin only (flush left)
+   .ad r -- adjust right margin only (flush right)
+   .ad c -- center text on line
+   .ad b -- adjust both margins (alias: .ad n)
+   .na   -- temporarily disable adjustment without changing the mode
+   .ad   -- re-enable adjustment without changing the mode
+   Adjustment mode is ignored while in no-fill mode (.nf).
+   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
+ - .fc (field control)
+   found by naddy@ in xloadimage(1)
+   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)
+   when implementing this, also let .TH set it
+   reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500
+   loc ***  exist ***  algo ***  size **  imp *
+ - .ta (tab settings)
+   #1 most important issue naddy@ Mon, 16 Feb 2015 20:59:17 +0100
+   ircbug(1) gnats(1) reported by brad@  Sat, 15 Jan 2011 15:50:51 -0500
+   also Tcl_NewStringObj(3) via wiz@  Wed, 5 Mar 2014 22:27:43 +0100
+   also posix2time(3) Carsten Kunze  Mon, 1 Dec 2014 13:03:10 +0100
+   loc **  exist ***  algo **  size **  imp ***
+ - .ti (temporary indent)
+   found by naddy@ in xloadimage(1) [devel/libvstr] vstr(3)
+   found by bentley@ in nmh(1)  Mon, 23 Apr 2012 13:38:28 -0600
+   loc **  exist **  algo **  size *  imp ** (parser reorg helps a lot)
+ - .while and .shift
+   found by jca@ in ratpoison(1)  Sun, 30 Jun 2013 12:01:09 +0200
+   loc *  exist **  algo **  size **  imp **
+ - \h horizontal move
+   #2 most important issue naddy@  Mon, 16 Feb 2015 20:59:17 +0100
+   found in cclive(1) nasm(1) bogofilter(1) asciidoc/DocBook output
+   bentley@ on discuss@  Sat, 21 Sep 2013 22:29:34 -0600
+   naddy@  Thu, 4 Dec 2014 16:26:41 +0100
+   loc **  exist **  algo **  size *  imp *** (parser reorg helps a lot)
+ - \n+ and \n- numerical register increment and decrement
+   found by bentley@ in sbcl(1)  Mon, 9 Dec 2013 18:36:57 -0700
+   loc *  exist *  algo *  size *  imp **
+ - \n(.$ macro argument count number register; ocserv(8) by autogen
+   found by sthen@  Thu, 19 Feb 2015 22:03:01 +0000
+   loc *  exist **  algo *  size *  imp **
+ - \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:
+) macro and string definition (roff.c setstrn())
+) 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
+   wl@  Mon, 14 Nov 2011 14:37:01 +0000
+   loc *  exist *  algo *  size *  imp *
+ --- missing mdoc features ----------------------------------------------
  - .Bl -column .Xo support is missing
    ultimate goal:
    restore .Xr and .Dv to
    lib/libc/compat-43/sigvec.3
    lib/libc/gen/signal.3
    lib/libc/sys/sigaction.2
+   loc *  exist ***  algo ***  size *  imp **
  - 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)
    from jmc@  Wed, 14 Jul 2010 18:10:32 +0100
+   loc *  exist ***  algo ***  size **  imp **
- - auto-Bk in the SYNOPSIS
+ - .Bd -centered implies -filled, not -unfilled, which is not
-   patch from kristaps@  Fri, 16 Jul 2010 14:51:24 +0200
+   easy to implement; it requires code similar to .ce, which
-   to be revisited after OpenBSD 4.8 tree unlock
+   we don't have either.
+   Besides, groff has bug causing text right *before* .Bd -centered
+   to be centered as well.
+   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
- - implement \\
+ - .Bd -filled should not be the same as .Bd -ragged, but align both
-   in plain text, identical to \e
+   the left and right margin.  In groff, it is implemented in terms
-   as a macro argument, identical to \ i.e. escaping the next character
+   of .ad b, which we don't have either.  Found in cksum(1).
-   We do not have macro definitions yet; if we implement them,
+   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
-   \\ must behave in a macro def like in a macro argument,
-   and when using the macro, it must expand yet again.
- - implement \s (physical font size)
-   \sN - set to N
-   \s+N - increment by N, 1 <= N <= 8
-   \s-N - decrement by N, 1 <= N <= 8
-   \s0 - restore previous size
-   \s(nn \s+-(nn \s'+-nn' \s+-'nn' \s[+-nn] \s+-[nn] - disambiguate
-   registers: .s .ps .sr .psr
-   used by e.g. cu(1), tip(1)
- - look at bsd.lv tbl(1)
-   from kristaps@  Fri, 11 Sep 2009 17:10:53 +0200
-   also look at the mail from Thomas Klausner wiz at NetBSD
-     on Wed, 2 Jun 2010 11:01:29 +0200
- - 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
-   roff stuff.  Figure out to what extent we can cope.
-   noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200
-   reminded by nicm@  Mon, 3 May 2010 09:52:41 +0100
  - implement blank `Bl -column', such as
    .Bl -column
    .It foo Ta bar
    .El
+   loc *  exist ***  algo ***  size *  imp *
  - explicitly disallow nested `Bl -column', which would clobber internal
    flags defined for struct mdoc_macro
+   loc *  exist *  algo *  size *  imp **
- - set a meaningful default if no `Bl' list type is assigned
+ - 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
+   ugly code from login.conf(5):
+     .Bl -column minpasswordlen program xetcxmotd
+     .It path Ta path Ta value of Dv _PATH_DEFPATH
+     .br
+     Default search path.
+   reported by Michal Mazurek <akfaew at jasminek dot net>
+   via jmc@ Thu, 7 Apr 2011 16:00:53 +0059
+   loc *  exist ***  algo **  size *  imp **
- - have a blank `It' head for `Bl -tag' not puke
+ - inside `.Bl -column' phrases, punctuation is handled like normal
+   text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."
- - ignore horrendous m[] font colouring
+ - inside `.Bl -column' phrases, TERMP_IGNDELIM handling by `Pf'
-   reported by J.C. Roberts
+   is not safe, e.g. `.Bl -column .It Pf a b .' gives "ab."
+   but should give "ab ."
+ - check whether it is correct that `D1' uses INDENT+1;
+   does it need its own constant?
+   loc *  exist **  algo **  size *  imp **
  - prohibit `Nm' from having non-text HEAD children
    (e.g., NetBSD mDNSShared/dns-sd.1)
    (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
+   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.
+   No idea how the logic for distinguishing in-line and block instances
+   should be, needs investigation.
+   uqs@  Thu, 2 Jun 2011 11:03:51 +0200
+   uqs@  Thu, 2 Jun 2011 11:33:35 +0200
+   loc *  exist **  algo ***  size *  imp **
+ --- missing man features -----------------------------------------------
+ - -T[x]html doesn't stipulate non-collapsing spaces in literal mode
+ --- missing tbl features -----------------------------------------------
+ - horizontal lines in the layout still consume data cells
+   and can be mixed with actual data on the same table line
+   synaptics(4) found by tedu@  Mon, 17 Aug 2015 21:17:42 -0400
+   loc **  exist **  algo **  size **  imp ***
+ - the "w" layout option is ignored
+   synaptics(4) found by tedu@  Mon, 17 Aug 2015 21:17:42 -0400
+   loc *  exist *  algo *  size *  imp **
+ - the "s" layout column specifier is used for placement of data
+   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 **
+ - 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.
+   loc ***  exist **  algo ***  size **  imp ***
+ - look at the POSIX manuals in the books/man-pages-posix port,
+   they use some unsupported tbl(7) features.
+   loc *  exist **  algo **  size **  imp ***
+ - use Unicode U+2500 to U+256C for table borders
+   in tbl(7) -Tutf-8 output
+   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 **
+ --- 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 ***
+ - makewhatis(8) for preformatted pages:
+   parse the section number from the header line
+   and compare to the section number from the directory name
+   loc *  exist *  algo *  size *  imp **
+ - Does makewhatis(8) detect missing NAME sections, missing names,
+   and missing descriptions in all the file formats?
+   loc *  exist *  algo *  size *  imp ***
+ - clean up escape sequence handling, creating three classes:
+   (1) fully implemented, or parsed and ignored without loss of content
+   (2) unimplemented, potentially causing loss of content
+       or serious mangling of formatting (e.g. \n) -> ERROR
+       see textproc/mgdiff(1) for nice examples
+   (3) undefined, just output the character -> perhaps WARNING
+   loc ***  exist **  algo **  size **  imp *** (parser reorg helps)
+ - kettenis wants base roff, ms, and me  Fri, 1 Jan 2010 22:13:15 +0100 (CET)
+   loc **  exist **  algo **  size ***  imp *
+ - Vsevolod Stakhov (FreeBSD) needs either a markdown output formatter
+   for mandoc -mdoc or a markdown to mdoc converter because they
+   have to maintain manuals needed both in markdown and mdoc format.
+   Look at the libsoldout (markdown -> whatever)
+   loc *  exist *  algo *  size **  imp **
+ --- 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
+ - 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
+   roff stuff.  Figure out to what extent we can cope.
+   For details, see http://docutils.sourceforge.net/rst.html
+   noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200
+   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:
+   http://swtch.com/usr/local/plan9/tmac/tmac.an
+   http://swtch.com/plan9port/man/man7/man.html
+   "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
  ************************************************************************
  * formatting issues: ugly output
  ************************************************************************
- - perl(1) SYNOPSIS looks bad; reported by deraadt@
+ - revisit empty in-line macros
-) "\ " is non-breaking
+   look at the difference between "Em x Em ." and "Sq x Em ."
-) man(7) seems to need SYNOPSIS .Nm blocks, too
+   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
+ - In .Bl -column, .It a<tab>"b<tab>c"
+   shows the quotes in groff, but not in mandoc
+   loc * exist *** algo ** size * imp **
+ - In .Bl -column,
+   .It Em Authentication<tab>Key Length
+   ought to render "Key Length" with emphasis, too,
+   see OpenBSD iked.conf(5).
+   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
    try e.g. .Bl -column It Ta Ta
    reported by millert Fri, 02 Apr 2010 16:13:46 -0400
+   loc *  exist ***  algo ***  size *  imp **
- - .Pp before and after .Sh (and .Ss) produces a spurious blank line;
+ - .%T can have trailing punctuation.  Currently, it puts the trailing
-   reported by jmc@  Thu, 15 Jul 2010 23:00:28 +0100
+   punctuation into a trailing MDOC_TEXT element inside its own scope.
+   That element should rather be outside its scope, such that the
+   punctuation does not get underlines.  This is not trivial to
+   implement because .%T then needs some features of in_line_eoln() -
+   slurp all arguments into one single text element - and one feature
+   of in_line() - put trailing punctuation out of scope.
+   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
+ - in enclosures, mandoc sometimes fancies a bogus end of sentence
+   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
+ --- 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 (?)).
+   loc *  exist **  algo **  size *  imp **
+ --- HTML issues --------------------------------------------------------
+ - <dl><dt><dd> formatting is ugly
+   hints are easy to find on the web, e.g.
+   http://stackoverflow.com/questions/1713048/
+   see also matthew@  Fri, 18 Jul 2014 19:25:12 -0700
+   loc *  exist *  algo **  size *  imp ***
+ - In -man -Thtml, .nf does not preserve indentation.
+   It should either convert blanks to &nbsp;
+   or use <pre> rather than <div> (like .Bd -literal does).
+   Reported by afresh1@  12 Apr 2016 14:35:45 -0700
+ - .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
+ - 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 ***
+ - consider whether <var> can be used for Ar Dv Er Ev Fa Va.
+   from bentley@  Wed, 13 Aug 2014 09:17:55 -0600
+ - 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: gratuitious differences
+ * formatting issues: gratuitous differences
  ************************************************************************
- - none reported right now (yet schwarze@ knows of some)
+ - .Fn reopens a new scope after punctuation in mandoc,
+   but closes its scope for good in groff.
+   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 -enum -width 0n, groff continues one the same line after
+   the number, mandoc breaks the line.
+   mail to kristaps@  Mon, 20 Jul 2009 02:21:39 +0200
+   loc *  exist **  algo **  size *  imp **
+ - .Pp between two .It in .Bl -column should produce one,
+   not two blank lines, see e.g. login.conf(5).
+   reported by jmc@  Sun, 17 Apr 2011 14:04:58 +0059
+   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
+   the tag, do not pad with space characters before breaking.
+   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
+   in between, see for example tmux(1).
+   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
+   should be "NetBSD 1.0A", not "NetBSD 1.0a",
+   see OpenBSD ccdconfig(8).
+   loc *  exist *  algo *  size *  imp **
+ - 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;
+   see "rule block|pass" in OpenBSD ifconfig(8).
+   loc *  exist ***  algo **  size *  imp **
+ - When the -width string contains macros, the macros must be rendered
+   before measuring the width, for example
+     .Bl -tag -width ".Dv message"
+   in magic(5), located in src/usr.bin/file, is the same
+   as -width 7n, not -width 11n.
+   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 Franco Fichtner Fri, 27 Sep 2013 21:02:28 +0200
+   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.
+   That is, when it is alone on a line between two .Pp,
+   we want three blank lines, not two as in mandoc.
+   loc **  exist **  algo **  size *  imp **
+ - 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
+   loc *  exist *  algo *  size *  imp *
+ - Sequences of multiple man(7) paragraphs (.PP, .IP) interspersed
+   with .ps and .nf/.fi produce execessive blank lines, see libJudy
+   and graphics/dcmtk.  The parser reorg may help with this.
+ - trailing whitespace must be ignored even when followed by a font escape,
+   see for example
+     makes
+     \fBdig \fR
+     operate in batch mode
+   in dig(1).
+   loc **  exist **  algo **  size *  imp **
  ************************************************************************
+ * portability
+ ************************************************************************
+ - systems having UTF-8 but not en_US.UTF-8
+   call locale(1) from ./configure, select a UTF-8-locale,
+   and use that for test-wchar.c and term_ascii.c
+   to Markus Waldeck  Sat, 18 Jul 2015 01:55:37 +0200
+   loc *  exist *  algo *  size *  imp *
+ ************************************************************************
+ * warning issues
+ ************************************************************************
+ - provide a way in mandoc(1) to warn about broken .Xr links;
+   probably cannot be on by default in -Tlint because it needs
+   to access the manpath and mandoc.db(3) after parsing.
+   asked for by jmc@ Fri, 4 Dec 2015 22:39:40 +0000
+ - Report errors in -O suboption parsing.
+   loc *  exist *  algo *  size *  imp **
+ - warn when .Sh or .Ss contain other macros
+   Steffen Nurpmeso, savannah.gnu.org/bugs/index.php?45034
+   loc *  exist *  algo *  size *  imp **
+ - check that MANDOCERR_BADTAB is thrown in the right cases,
+   i.e. when finding a literal tab character in fill mode,
+   and possibly change the wording of the warning message
+   to refer to fill mode, not literal mode
+   See the mail from Werner LEMBERG on the groff list,
+   Fri, 14 Feb 2014 18:54:42 +0100 (CET)
+   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 **
+ - warn about "new sentence, new line"
+   loc **  exist **  algo ***  size *  imp **
+ - mandoc_special does not really check the escape sequence,
+   but just the overall format
+   loc **  exist **  algo ***  size **  imp **
+ - integrate mdoclint into mandoc ("end-of-line whitespace" thread)
+   from jmc@  Mon, 13 Jul 2009 17:12:09 +0100
+   from kristaps@  Mon, 13 Jul 2009 18:34:53 +0200
+   from jmc@  Mon, 13 Jul 2009 17:45:37 +0059
+   from kristaps@  Mon, 13 Jul 2009 19:02:03 +0200
+   (mostly done, check what remains)
+ - -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
+ ************************************************************************
+ * documentation issues
+ ************************************************************************
+ - mention hyphenation rules:
+   breaking at letter-letter in text mode (not macro args)
+   proper hyphenation is unimplemented
+ - talk about spacing around delimiters
+   to jmc@, kristaps@  Sat, 23 Apr 2011 17:41:27 +0200
+ - mark macros as: page structure domain, manual domain, general text domain
+   is this useful?
+ - mention /usr/share/misc/mdoc.template in mdoc(7)?
+ - Is all the content from http://www.std.com/obi/BSD/doc/usd/28.tbl/tbl
+   covered in tbl(7)?
+ ************************************************************************
  * performance issues
  ************************************************************************
- Several areas can be cleaned up to make mandoc even faster.  These are
+ - Why are we using MAP_SHARED, not MAP_PRIVATE for mmap(2)?
+   from kristaps@  Sat, 09 Aug 2014 13:51:36 +0200
+ Several areas can be cleaned up to make mandoc even faster.  These are
  - improve hashing mechanism for macros (quite important: performance)
  - improve hashing mechanism for characters (not as important)
+ - the PDF file is HUGE: this can be reduced by using relative offsets
+ - instead of re-initialising the roff predefined-strings set before each
+   parse, create a read-only version the first time and copy it
+   loc *  exist **  algo **  size *  imp **
  ************************************************************************
  * structural issues
  ************************************************************************
+ - We use the input line number at several places to distinguish
+   same-line from different-line input.  That plainly doesn't work
+   with user-defined macros, leading to random breakage.
+ - Find better ways to prevent endless loops
+   in roff(7) macro and string expansion.
+ - Finish cleanup of date handling.
+   Decide which formats should be recognized where.
+   Update both mdoc(7) and man(7) documentation.
+   Triggered by  Tim van der Molen  Tue, 22 Feb 2011 20:30:45 +0100
+ - struct mparse refactoring
+   Steffen Nurpmeso  Thu, 04 Sep 2014 12:50:00 +0200
+ ************************************************************************
+ * 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.
+  - Allow for cgi.h to be overridden by CGI environment variables.
+    Otherwise, binary distributions will inherit the compile-time
+    behaviour, which is not optimal.
+  - 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

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