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freebsd-nq/contrib/mandoc/TODO
Baptiste Daroussin 45a5aec3f1 Update mandoc to cvs snapshot 2019-07-23 
This snapshot among other things includes a fix for a crash of mandoc with empty
tbl reported by rea@ (his regression test has been incorporated upstream)

MFC after:	3 weeks
2019-07-26 10:00:33 +00:00

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************************************************************************
* Official mandoc TODO.
* $Id: TODO,v 1.295 2019/06/11 16:04:36 schwarze Exp $
************************************************************************
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 roff features ----------------------------------------------
- .ad (adjust margins)
.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 *
- .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 *
- \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 ***
- .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 *
--- 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 **
- .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).
loc *** exist *** algo ** size ** imp ** (parser reorg would help)
- 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 **
- 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 **
- inside `.Bl -column' phrases, punctuation is handled like normal
text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."
- inside `.Bl -column' phrases, TERMP_IGNDELIM handling by `Pf'
is not safe, e.g. `.Bl -column .It Pf a b .' gives "ab."
but should give "ab ."
- 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 -----------------------------------------------
- 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, mostly macros in tbl(7).
loc * exist ** algo ** size ** imp ***
- look what Joerg Schilling manual pages use
Thu, 19 Mar 2015 18:31:48 +0100
--- 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 *
- 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
loc * exist ** algo ** size * imp *
- Primes, opprime, and '
bentley@ Thu, 13 Jul 2017 23:14:20 -0600
--- missing misc features ----------------------------------------------
- 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 *
- 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:
(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 *
--- 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)
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
- 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
************************************************************************
* formatting issues: ugly output
************************************************************************
- 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
- 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 **
- .%T can have trailing punctuation. Currently, it puts the trailing
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
- 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 ***
- 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
--- 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
************************************************************************
- .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 **
- 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
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.
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 **
- 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 **
************************************************************************
* warning issues
************************************************************************
- 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.
.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 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)
- makewhatis -p complains about language subdirectories:
/usr/local/man//ru: Unknown directory part
************************************************************************
* documentation issues
************************************************************************
- 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
************************************************************************
- the PDF file is HUGE: this can be reduced by using relative offsets
************************************************************************
* 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
- Is it possible to further simplify ENDBODY_SPACE?
- Find better ways to prevent endless loops
in roff(7) macro and string expansion.
- 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
************************************************************************
* CGI issues
************************************************************************
- Enable HTTP compression by detecting gzip encoding and filtering
output through libz.
- Privilege separation (see OpenSSH).
- Enable caching support via HTTP 304 and If-Modified-Since.
************************************************************************
* to improve in the groff_mdoc(7) macros
************************************************************************
- .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?
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