===================================================================
RCS file: /cvs/mandoc/TODO,v
retrieving revision 1.196
retrieving revision 1.334
diff -u -p -r1.196 -r1.334
--- mandoc/TODO	2014/12/17 20:31:19	1.196
+++ mandoc/TODO	2023/11/24 05:02:18	1.334
@@ -1,6 +1,6 @@
 ************************************************************************
 * Official mandoc TODO.
-* $Id: TODO,v 1.196 2014/12/17 20:31:19 schwarze Exp $
+* $Id: TODO,v 1.334 2023/11/24 05:02:18 schwarze Exp $
 ************************************************************************
 
 Many issues are annotated for difficulty as follows:
@@ -33,15 +33,51 @@ Obviously, as the issues have not been solved yet, the
 are mere guesses, and some may be wrong.
 
 ************************************************************************
-* crashes
+* assertion failures
 ************************************************************************
 
-- 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 **
+- .if n .ce in the middle of .TS data
+  afl case f1/id:000103,sig:06,src:009024+009105,op:splice,rep:2 (jes@)
+  While roff_parseln() prevents .ce and similar requests in the middle
+  of a tbl, the guard is no longer effective when the .ce is wrapped
+  in a roff block, for example a conditional.  The resulting assertion
+  has never been seen in any real-world manual page.
+  This is too dangerous to fix before release because it requires
+  reorganizing the very delicate internals of roff_parseln(),
+  which risks causing more severe bugs.
+  loc * exist *** algo *** size * imp *
 
+
 ************************************************************************
+* bugs: invalid output
+************************************************************************
+
+- wrong number of layout columns in tbl(7) code generated by -T man
+  https://savannah.gnu.org/bugs/?57720
+  The reason likely is that tbl(7) does not support the -Bl -column
+  feature of not explicitly specifying the last table column.
+  loc **  exist *  algo **  size *  imp ***
+
+- eqn(7) delimiters cause conditional lines to misbehave
+  nabijaczleweli 8 Sep 2021 15:24:48 +0200
+  loc *  exist ***  algo ***  size *  imp *
+
+- roff.c, roff_expand() should not remove blanks before comments
+  to Oliver Corff, Sep 7, 2021
+  loc *  exist *  algo *  size *  imp *
+  but watch out for regressions in the high-level parsers
+  maybe it should not even remove comments? - consider T{\"
+
+- In the body of conditional requests, escape sequence expansion
+  must not be performed if the condition is false.  This implies
+  the first part of a request line must be expanded before
+  request parsing (like it is now), but expansion in the second
+  part must be delayed.
+  to Nab 8 Aug 2023 20:05:32 +0200 Subject: if/ie d condition always true
+  loc **  exist ***  algo ***  size **  imp *
+
+
+************************************************************************
 * missing features
 ************************************************************************
 
@@ -60,55 +96,76 @@ are mere guesses, and some may be wrong.
 - .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) occurs in ircbug(1) and probably 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)
-  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
-  found in cclive(1) and nasm(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 **
-
 - \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 ***
 
-- using undefined strings or macros defines them to be empty
-  wl@  Mon, 14 Nov 2011 14:37:01 +0000
+- .als only works for macros in mandoc, not for user-defined strings.
+  Also, the "val" field in struct roffkv would have to be replaced
+  with a pointer to a reference-counted wrapper, and an alias
+  would have to point to the same wrapper as the original.
+  .als to undefined does nothing; the alias is not created.
+  .rm'ing the original leaves the alias to point to the old value.
+  .de .als .de changes both, but
+  .de .als .rm .de only changes the new value, not the alias.
+  Found in groffer(1) version 1.19
+  Jan Stary 20 Apr 2019 20:16:54 +0200
+  loc *  exist **  algo **  size **  imp *
+
+- roff string condition comparisons fail when vars contain quotes:
+  .ds s '
+  .if '\*s'' \&...
+  hard to fix because of the basic architecture (string replacement
+  happens before roff(7) syntax parsing)
+  Found in groffer(1) version 1.19
+  Jan Stary 20 Apr 2019 20:16:54 +0200
+  loc *  exist ***  algo ***  size **  imp *
+
+- mandoc replaces all ASCII control characters except tab and line feed
+  with '?' during input.  It would be better to replace them with
+  Unicode escapes in preconv_encode() or somewhere in the vicinity,
+  such that the already existing better replacement strings show
+  up in the output.  Emulating groff is not desirable: groff replaces
+  0x00, 0x0b, and 0x0d to 0x1f with the empty string (bad because
+  that's easy to overlook for the document author), 0x01 with '.'
+  (very confusing), and passes through 0x02 to 0x08, 0x0c, and 0x7f
+  raw (bad because that is insecure output).  Remember that 0x07 may
+  need special handling because it is sometimes used for certain
+  delimiters, so it may need handling *after* roff.c rather than before.
+  reminded by John Gardner 16 Jun 2020 14:26:28 +1000
+  Actually, more ASCII control characters than just 0x07 may need
+  later handling because they can for example be used in macro names.
+  So they may need handling after roff(7) processing.
+  pointed out by John Gardner 23 Jun 2020 18:28:08 +1000
+  more info from John Gardner 29 Jun 2020 19:54:04 +1000
+  loc **  exist **  algo **  size **  imp *
+
+- many missing features used in old groff_char(7),
+  some can possibly be supported
+  kamil at netbsd 12 Nov 2020 17:27:09 +0100 + reply
+
+- \s with arbitrary arg delimiters as already supported for other escapes
+  found following jmc@'s mail 28 Apr 2021 18:31:41 +0100
   loc *  exist *  algo *  size *  imp *
 
 --- missing mdoc features ----------------------------------------------
 
-- fix bad block nesting involving multiple identical explicit blocks
-  see the OpenBSD mdoc_macro.c 1.47 commit message
-  loc *  exist ***  algo ***  size *  imp **
+- support mixed case for section names
+  also, first section is not "NAME" should not appear more than once per page
+  Alejandro Colomar 28 Apr 2023 16:57:49 +0200
+  loc * exist * algo * size * imp ***
 
+- .Sh and .Ss should be parsed and partially callable, see groff_mdoc(7)
+  reed at reedmedia dot net Sat, 21 Dec 2019 17:13:07 -0600
+  loc **  exist **  algo **  size **  imp *
+
 - .Bl -column .Xo support is missing
   ultimate goal:
   restore .Xr and .Dv to
@@ -122,13 +179,6 @@ are mere guesses, and some may be wrong.
   from jmc@  Wed, 14 Jul 2010 18:10:32 +0100
   loc *  exist ***  algo ***  size **  imp **
 
-- .Bd -centered implies -filled, not -unfilled, which is not
-  easy to implement; it requires code similar to .ce, which
-  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)
-
 - .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
   of .ad b, which we don't have either.  Found in cksum(1).
@@ -162,10 +212,6 @@ are mere guesses, and some may be wrong.
   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)
@@ -188,26 +234,53 @@ are mere guesses, and some may be wrong.
 
 --- missing man features -----------------------------------------------
 
-- -T[x]html doesn't stipulate non-collapsing spaces in literal mode
+- MANWIDTH
+  Markus Waldeck <waldeck at gmx dot de> 9 Jun 2015 05:49:56 +0200
+  Laura Morales <lauretas at mail dot com> 26 Apr 2018 08:15:55 +0200
+  Kamil Rytarowski <kamil at netbsd> 13 Nov 2020 00:19:36 +0100
+  patch from Kamil 13 Nov 2020 22:37:07 +0100
+  loc *  exist *  algo *  size *  imp *
 
+- groff_www(7) .MTO and .URL
+  These macros were used by the GNU grep(1) man page.
+  The groff_www(7) manual page itself uses them, too.
+  We should probably *not* add them to mandoc.
+  Just mentioning this here to keep track of the abuse.
+  Laura Morales <lauretas at mail dot com> 20 Apr 2018 07:33:02 +0200
+  loc **  exist *  algo *  size **  imp *
+
 --- missing tbl features -----------------------------------------------
 
+- vertical centering in cells vertically spanned with ^
+  pali dot rohar at gmail dot com 16 Jul 2018 13:03:35 +0200
+  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: 3 Jan 2015 23:32:23 +0100
+  loc ***  exist **  algo ***  size **  imp ***
+
 - look at the POSIX manuals in the books/man-pages-posix port,
-  they use some unsupported tbl(7) features.
+  they use some unsupported tbl(7) features, mostly macros in tbl(7).
   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 **
+- look what Joerg Schilling manual pages use
+  Thu, 19 Mar 2015 18:31:48 +0100
 
-- allow standalone `.' to be interpreted as an end-of-layout
-  delimiter instead of being thrown away as a no-op roff line
-  reported by Yuri Pankov, Wed 18 May 2011 11:34:59 CEST
-  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.
+  This may not be the ideal solution after all: eqn(7) matrices
+  are lists of columns, so Avi's proposal would show each *column*
+  on its own *line*, which is likely to cause confusion.
+  A better solution, but much harder to implement, would be to
+  actually show the coordinates of column vectors on different
+  terminal output lines, using the clumnated output facilities
+  developed for .Bl -tag, .Bl -column, and also used for tbl(7).
+  loc *  exist *  algo **  size **  imp **
+
 - The "size" keyword is parsed, but ignored by the formatter.
   loc *  exist *  algo *  size *  imp *
 
@@ -219,27 +292,51 @@ are mere guesses, and some may be wrong.
   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
+  loc *  exist **  algo **  size *  imp *
+
+- Primes, opprime, and '
+  bentley@  Thu, 13 Jul 2017 23:14:20 -0600
+
 --- missing misc features ----------------------------------------------
 
+- use the default volume headers for sections with suffixes
+  certainly affects man(7); possibly mdoc(7)?; and also groff(1)
+  Alejandro Colomar 21 Aug 2022
+
+- consider whether man(1) fallback code in main.c/fs_*() can find files
+  like man3c/fopen.3c (illumos, Solaris) and man3p/fopen.3p (POSIX)
+  discussed with Robert Mustacchi 21 Sep 2021 10:39:40 -0700
+  loc *  exist *  algo **  size *  imp **
+
+- let makewhatis(8) follow symbolic links to dirs below READ_ALLOWED_PATH
+  this may be feasible using fts_set(FTS_FOLLOW)
+  mail to sternenseemann 19 Aug 2021 19:11:50 +0200
+  loc *  exist **  algo **  size *  imp **
+
+- handle Unicode letters in tags in both HTML and terminal output
+  thread "section headers with diacritics" starting with
+  Mario Blaettermann 24 Mar 2022 18:13:23 +0100
+  loc **  exist *  algo *  size *  imp **
+
+- -T man does not handle eqn(7) and tbl(7)
+  Stephen Gregoratto 16 Feb 2020 01:28:07 +1100
+  also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901636
+  loc **  exist **  algo **  size ***  imp **
+
+- man -ks 1,8 route; kn@ Jul 13, 2018 orally
+
 - 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 *
 
-- When makewhatis(8) encounters a FATAL parse error,
-  it silently treats the file as formatted, which makes no sense
-  at all for paths like man1/foo.1 - and which also contradicts
-  what the manual says at the end of the description.
-  The end result will be ENOENT for file names returned
-  by mansearch() in manpage.file.
-  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?
+- 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:
@@ -250,15 +347,15 @@ are mere guesses, and some may be wrong.
   (3) undefined, just output the character -> perhaps WARNING
   loc ***  exist **  algo **  size **  imp *** (parser reorg helps)
 
+- man.conf(5) alias aliasname dirname or just -Mb -Mx -Mp
+  mail to jmc@ Mar 23, 2015 03:53:14PM +0100
+  loc *  exist *  algo *  size *  imp **
+
 - kettenis wants base roff, ms, and me  Fri, 1 Jan 2010 22:13:15 +0100 (CET)
   loc **  exist **  algo **  size ***  imp *
 
 --- compatibility checks -----------------------------------------------
 
-- write a configure check for [[:<:]] support and provide some
-  fallback for whatis(1) when it doesn't work;
-  Svyatoslav Mishyn  Wed, 17 Dec 2014 11:07:10 +0200
-
 - is .Bk implemented correctly in modern groff?
   sobrado@  Tue, 19 Apr 2011 22:12:55 +0200
 
@@ -268,6 +365,8 @@ are mere guesses, and some may be wrong.
 - 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)
   These are a weird mixture of man(7) and custom autogenerated low-level
@@ -291,6 +390,9 @@ are mere guesses, and some may be wrong.
   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
 
@@ -299,6 +401,16 @@ are mere guesses, and some may be wrong.
   https://github.com/schmonz/ikiwiki/compare/mandoc
   Amitai Schlair  Mon, 19 May 2014 14:05:53 -0400
 
+- check compatibility with
+  https://git.sr.ht/~sircmpwn/scdoc
+
+- check features of the Slackware man.conf(5) format
+  Carsten Kunze  Wed, 11 Mar 2015 17:57:24 +0100
+
+- look at http://www.snake.net/software/troffcvt/  (troff to HTML)
+  mentioned by Oliver Corff  22 Jan 2021 01:36:49 +0100
+
+
 ************************************************************************
 * formatting issues: ugly output
 ************************************************************************
@@ -347,15 +459,31 @@ are mere guesses, and some may be wrong.
   .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
   reminded by jmc@  Thu, 23 Sep 2010 18:13:39 +0059
   loc *  exist **  algo ***  size *  imp ***
 
+- the man(7) single-font macros (e.g. .B) use .itc,
+  so ".B foo\c" followed by "bar" prints "bar" in bold
+  gbranden@ Sun, 5 Jun 2022 18:08:46 -0500
+
+- a line starting with "\fB something" counts as starting with whitespace
+  and triggers a line break; found in audio/normalize-mp3(1)
+  This will become easier once escape sequences are represented
+  by syntax tree nodes.
+  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 ---------------------------------------------------------
+--- 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".
@@ -365,31 +493,85 @@ are mere guesses, and some may be wrong.
   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 **
+  re-reported by tb@ Mon, 16 Mar 2015 16:47:21 +0100
+  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 ***
+- support the idiom .TP .IP .TP for multi-paragraph list item bodies
+  to: Alejandro Colomar Thu, 19 Oct 2023 16:45:21 +0200
+  loc **  exist **  algo **  size **  imp **
 
+- .Nm without an argument and .Bx cause premature </pre>
+  Nab Sun, 5 Jun 2022 18:30:09 +0200
+
+- .Aq Mt could set and reset "white-space: nowrap";
+  Check whether other enclosure macros could profit from similar handling,
+  or whether that is covered by Unicode line-breaking classes WJ, ZW, GL, ZWJ.
+  John Gardner 25 Mar 2022 04:44:27 +1100
+
+- make the HTML scaffolding customizable with -O skip=...
+  mail to Oliver Corff  3 Jun 2021 17:28:02 +0200
+  more feedback from Oliver  3 Jun 2021 18:27:56 +0200
+  more feedback from Oliver  3 Jun 2021 23:37:18 +0200
+  would also be useful for
+  https://github.com/gbdev/rgbds-www/blob/master/
+  maintainer/support/man_postproc.awk
+
+- .Bd -unfilled should not use monospaced font
+  anton@  4 Mar 2021 08:19:35 +0100
+  loc **  exist *  algo *  size *  imp **
+
+- HTML formatting of .nf should avoid <br/>,
+  even when input lines start with whitespace,
+  and not close and re-open <pre> on .P
+  my mail to ports@ 27 Jun 2021 16:09:20 +0200
+  reported again by Mohamed Akram 25 Jun 2022 16:28:18 +0000
+  loc **  exist **  algo *  size *  imp **
+
+- tbl(7) HTML output does not implement column width specifications
+  reported by Ted Bullock 11 Jan 2022 16:00:44 -0700
+  loc *  exist *  algo ?  size ?  imp *
+
+- link from flags in the SYNOPSIS to their descriptions
+  https://github.com/gbdev/rgbds-www/blob/master/
+  maintainer/support/man_postproc.awk
+  loc *  exist *  algo **  size *  imp *
+
+- get rid of the last handful of style= attributes such that
+  Content-Security-Policy: can be enabled without unsafe-inline
+  suggested by bentley@  Nov 10, 2019 at 06:02:49AM -0700
+  loc *  exist *  algo *  size *  imp **
+
+- .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 ***
+- space characters can end up in href= attributes, for example coming
+  from the first .Xr argument (where they make no sense, but still);
+  does this affect other characters, other source macros...?
+  Jackson Pauls  29 Aug 2017 16:56:27 +0100
 
-- 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
 
+--- CSS issues ---------------------------------------------------------
+
+- use flexbox for .Bl-tag instead of the fragile float/clear mechanism
+  John Gardner 25 Mar 2022 04:44:27 +1100
+
+
 ************************************************************************
 * formatting issues: gratuitous differences
 ************************************************************************
@@ -426,16 +608,6 @@ are mere guesses, and some may be wrong.
   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"
@@ -444,6 +616,11 @@ are mere guesses, and some may be wrong.
   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
+  reported again by Bruce Evans Fri, 17 Feb 2017 21:22:44 +0100 via bapt@
+  https://reviews.freebsd.org/D35245
+  even groff_mdoc(7) uses this: Nab Sun, 5 Jun 2022 22:16:37 +0200
+  When implementing this, try to avoid breaking existing manuals,
+  or at least fix them: Jan Stary Sun, 5 Jun 2022 22:48:05 +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.
@@ -454,14 +631,16 @@ are mere guesses, and some may be wrong.
   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.
 
+- The man(7) .UR macro produces UTF-8 angle brackets in -Tutf8 output mode
+  with groff, but ASCII <> with mandoc
+  Alejandro Colomar Mon, 7 Aug 2023 17:13:29 +0200 Subject: hostname
+
 - trailing whitespace must be ignored even when followed by a font escape,
-  see for example 
+  see for example
     makes
     \fBdig \fR
     operate in batch mode
@@ -472,14 +651,40 @@ are mere guesses, and some may be wrong.
 * warning issues
 ************************************************************************
 
-- 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 **
+- shorten/simplify error messages for usage errors
+  To: deraadt@ 25 Oct 2020 23:37:01 +0100
+  loc **  exist *  algo *  size **  imp ***
 
+- warn about \\ and \. in interpretation mode
+  gbranden@, groff issue #62776, 10 Nov 2023 01:57:32 -0500
+
+- warn about output lines exceeding 80 characters
+  Alejandro Colomar Aug 22, 2022
+  not trivial because -T lint does not call any formatter
+  loc ***  exist *  algo **  size **  imp **
+
+- warn about duplicate .Sh/.Ss heads
+  gre(4): Rename duplicate sections 20 Apr 2018 15:27:33 +0200
+  loc *  exist *  algo *  size *  imp **
+
+- style message about macros inside .Bd -literal and .Dl, in particular
+  font changing macros like .Cm, .Ar, .Fa (from the mdoclint TODO)
+
+- style message about mismatches between the section number in the
+  file name (if it is known) and the section number in .Dt
+  (from the mdoclint TODO)
+
+- style message about NULL without .Dv (from the mdoclint TODO)
+
+- style message about error constants without .Er (from the mdoclint TODO)
+
+- warn when .Sh or .Ss contain other macros
+  Steffen Nurpmeso, savannah.gnu.org/bugs/index.php?45034
+  loc *  exist *  algo *  size *  imp **
+
+- style message about violations of the convention
+  .An name Aq Mt localpart@domain in AUTHORS (from the mdoclint TODO)
+
 - 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.
@@ -488,37 +693,23 @@ are mere guesses, and some may be wrong.
   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 **
+- warn about punctuation - e.g. ',' and ';' - at the beginning
+  of a text line, if it is likely intended to follow the preceding
+  output without intervening whitespace, in particular after a
+  macro line (from the mdoclint TODO)
 
-- mandoc_special does not really check the escape sequence,
-  but just the overall format
-  loc **  exist **  algo ***  size **  imp **
+- report double .TH in man(7) as an ERROR and let the first win
+  kristaps@  28 Mar 2021 13:30:41 +0200
+  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)
+- makewhatis -p complains about language subdirectories:
+  /usr/local/man//ru: Unknown directory part
 
-- -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
 
-- for system errors, use errno/strerror/warn/err
-
 ************************************************************************
 * 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?
 
@@ -531,66 +722,71 @@ are mere guesses, and some may be wrong.
 * performance issues
 ************************************************************************
 
-- Why are we using MAP_SHARED, not MAP_PRIVATE for mmap(2)?
-  How does SQLITE_CONFIG_PAGECACHE actually work?  Document it!
-  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
 ************************************************************************
 
-- Use libz directly instead of forking gunzip(1).
-  Suggested by bapt at FreeBSD among others.
+- 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
-  same-line from different-line input.  That plainly doesn't work
-  with user-defined macros, leading to random breakage.
+- Is it possible to further simplify ENDBODY_SPACE?
 
 - 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
 
+- make buffers for parsing functions const
+  christos@ via wiz@  Fri, 18 Dec 2015 17:10:01 +0100
+
 - struct mparse refactoring
   Steffen Nurpmeso  Thu, 04 Sep 2014 12:50:00 +0200
 
-- Consider creating some views that will make the database more
-  readable from the sqlite3 shell.  Consider using them to
-  abstract from the database structure, too.
-  suggested by espie@  Sat, 19 Apr 2014 14:52:57 +0200
-
 ************************************************************************
 * CGI issues
 ************************************************************************
 
+ - Inspect httpd(8) logs on man.openbsd.org and consider
+   whether logging can be improved, where bad syntax comes from,
+   and what needs to be done to get rid of COMPAT_OLDURI.
  - Enable HTTP compression by detecting gzip encoding and filtering
    output through libz.
- - Sandbox (see OpenSSH).
+ - Privilege separation (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
 ************************************************************************
 
+- delete OS release verification from .Dx, .Fx, .Nx, .Ox etc.
+  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=629161
+  also Branden Robinson 18 Dec 2019 00:59:52 +1100
+
+- Can the distinction between .Vt and .Va be made stricter,
+  recommending .Vt extern char * Ns Va optarg ; ?
+  What about the block macro properties of .Vt in the SYNOPSIS?
+  zeurkous 25 Dec 2019 08:48:36 +0100
+
+- .Cd # arch1, arch2 in section 4 pages:
+  find better way to indicate multiple architectures, maybe:
+  allow .Dt vgafb 4 "macppc sparc64"
+  already shown as "Device Drivers Manual (macppc sparc64)"
+  for apropos, make that "vgafb(4) - macppc # sparc64" instead of "- all"
+  groff can be made to show multiple arches, too, but it is
+  tedious to do the string parsing in roff code...
+  jmc@ 23 Apr 2018 07:24:52 +0100 [man for vgafb(4)...]
+  loc **  exist **  algo *  size *  imp ***
+
 - 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?