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Annotation of mandoc/TODO, Revision 1.306

1.1       kristaps    1: ************************************************************************
1.37      kristaps    2: * Official mandoc TODO.
1.306   ! schwarze    3: * $Id: TODO,v 1.305 2020/09/01 18:10:28 schwarze Exp $
1.27      kristaps    4: ************************************************************************
1.145     schwarze    5:
1.184     schwarze    6: Many issues are annotated for difficulty as follows:
                      7:
                      8:  - loc = locality of the issue
                      9:     *    single file issue, affects file only, or very few
                     10:     **   single module issue, affects several files of one module
                     11:     ***  cross-module issue, significantly impacts multiple modules
                     12:          and may require substantial changes to internal interfaces
                     13:  - exist = difficulty of the existing code in this area
                     14:     *    affected code is straightforward and easy to read and change
                     15:     **   affected code is somewhat complex, but once you understand
                     16:          the design, not particularly difficult to understand
                     17:     ***  affected code uses a special, exceptionally tricky design
                     18:  - algo = difficulty of the new algorithm to be written
                     19:     *    the required logic and code is straightforward
                     20:     **   the required logic is somewhat complex and needs a careful design
                     21:     ***  the required logic is exceptionally tricky,
                     22:          maybe an approach to solve that is not even known yet
                     23:  - size = the amount of code to be written or changed
                     24:     *    a small number of lines (at most 100, usually much less)
                     25:     **   a considerable amount of code (several dozen to a few hundred)
                     26:     ***  a large amount of code (many hundreds, maybe thousands)
                     27:  - imp = importance of the issue
                     28:     *    mostly for completeness
                     29:     **   would be nice to have
                     30:     ***  issue causes considerable inconvenience
                     31:
                     32: Obviously, as the issues have not been solved yet, these annotations
                     33: are mere guesses, and some may be wrong.
1.306   ! schwarze   34:
        !            35: ************************************************************************
        !            36: * assertion failures
        !            37: ************************************************************************
        !            38:
        !            39: - .if n .ce in the middle of .TS data
        !            40:   afl case f1/id:000103,sig:06,src:009024+009105,op:splice,rep:2 (jes@)
        !            41:   While roff_parseln() prevents .ce and similar requests in the middle
        !            42:   of a tbl, the guard is no longer effective when the .ce is wrapped
        !            43:   in a roff block, for example a conditional.  The resulting assertion
        !            44:   has never been seen in any real-world manual page.
        !            45:   This is too dangerous to fix before release because it requires
        !            46:   reorganizing the very delicate internals of roff_parseln(),
        !            47:   which risks causing more severe bugs.
        !            48:   loc * exist *** algo *** size * imp *
1.296     schwarze   49:
                     50: ************************************************************************
1.1       kristaps   51: * missing features
                     52: ************************************************************************
1.70      kristaps   53:
1.79      schwarze   54: --- missing roff features ----------------------------------------------
1.258     schwarze   55:
1.82      schwarze   56: - .ad (adjust margins)
                     57:   .ad l -- adjust left margin only (flush left)
                     58:   .ad r -- adjust right margin only (flush right)
                     59:   .ad c -- center text on line
                     60:   .ad b -- adjust both margins (alias: .ad n)
                     61:   .na   -- temporarily disable adjustment without changing the mode
                     62:   .ad   -- re-enable adjustment without changing the mode
                     63:   Adjustment mode is ignored while in no-fill mode (.nf).
1.184     schwarze   64:   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
1.150     schwarze   65:
                     66: - .fc (field control)
                     67:   found by naddy@ in xloadimage(1)
1.184     schwarze   68:   loc **  exist ***  algo *  size *  imp *
1.198     schwarze   69:
1.80      schwarze   70: - .ns (no-space mode) occurs in xine-config(1)
1.205     schwarze   71:   when implementing this, also let .TH set it
1.80      schwarze   72:   reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500
1.184     schwarze   73:   loc ***  exist ***  algo ***  size **  imp *
1.201     schwarze   74:
1.184     schwarze   75: - \w'' improve width measurements
1.167     schwarze   76:   would not be very useful without an expression parser, see below
                     77:   needed for Tcl_NewStringObj(3) via wiz@  Wed, 5 Mar 2014 22:27:43 +0100
1.184     schwarze   78:   loc **  exist ***  algo ***  size *  imp ***
1.291     schwarze   79:
                     80: - .als only works for macros in mandoc, not for user-defined strings.
                     81:   Also, the "val" field in struct roffkv would have to be replaced
                     82:   with a pointer to a reference-counted wrapper, and an alias
                     83:   would have to point to the same wrapper as the original.
                     84:   .als to undefined does nothing; the alias is not created.
                     85:   .rm'ing the original leaves the alias to point to the old value.
                     86:   .de .als .de changes both, but
                     87:   .de .als .rm .de only changes the new value, not the alias.
                     88:   Found in groffer(1) version 1.19
                     89:   Jan Stary 20 Apr 2019 20:16:54 +0200
                     90:   loc *  exist **  algo **  size **  imp *
                     91:
                     92: - roff string condition comparisons fail when vars contain quotes:
                     93:   .ds s '
                     94:   .if '\*s'' \&...
                     95:   hard to fix because of the basic architecture (string replacement
                     96:   happens before roff(7) syntax parsing)
                     97:   Found in groffer(1) version 1.19
                     98:   Jan Stary 20 Apr 2019 20:16:54 +0200
                     99:   loc *  exist ***  algo ***  size **  imp *
1.303     schwarze  100:
                    101: - mandoc replaces all ASCII control characters except tab and line feed
                    102:   with '?' during input.  It would be better to replace them with
                    103:   Unicode escapes in preconv_encode() or somewhere in the vicinity,
                    104:   such that the already existing better replacement strings show
                    105:   up in the output.  Emulating groff is not desirable: groff replaces
                    106:   0x00, 0x0b, and 0x0d to 0x1f with the empty string (bad because
                    107:   that's easy to overlook for the document author), 0x01 with '.'
                    108:   (very confusing), and passes through 0x02 to 0x08, 0x0c, and 0x7f
                    109:   raw (bad because that is insecure output).  Remember that 0x07 may
                    110:   need special handling because it is sometimes used for certain
                    111:   delimiters, so it may need handling *after* roff.c rather than before.
                    112:   reminded by John Gardner 16 Jun 2020 14:26:28 +1000
1.304     schwarze  113:   Actually, more ASCII control characters than just 0x07 may need
                    114:   later handling because they can for example be used in macro names.
                    115:   So they may need handling after roff(7) processing.
                    116:   pointed out by John Gardner 23 Jun 2020 18:28:08 +1000
1.305     schwarze  117:   more info from John Gardner 29 Jun 2020 19:54:04 +1000
1.303     schwarze  118:   loc **  exist **  algo **  size **  imp *
1.203     schwarze  119:
1.79      schwarze  120: --- missing mdoc features ----------------------------------------------
1.18      schwarze  121:
1.298     schwarze  122: - .Sh and .Ss should be parsed and partially callable, see groff_mdoc(7)
                    123:   reed at reedmedia dot net Sat, 21 Dec 2019 17:13:07 -0600
                    124:   loc **  exist **  algo **  size **  imp *
                    125:
1.1       kristaps  126: - .Bl -column .Xo support is missing
                    127:   ultimate goal:
                    128:   restore .Xr and .Dv to
                    129:   lib/libc/compat-43/sigvec.3
                    130:   lib/libc/gen/signal.3
                    131:   lib/libc/sys/sigaction.2
1.184     schwarze  132:   loc *  exist ***  algo ***  size *  imp **
1.1       kristaps  133:
1.28      schwarze  134: - edge case: decide how to deal with blk_full bad nesting, e.g.
                    135:   .Sh .Nm .Bk .Nm .Ek .Sh found by jmc@ in ssh-keygen(1)
                    136:   from jmc@  Wed, 14 Jul 2010 18:10:32 +0100
1.184     schwarze  137:   loc *  exist ***  algo ***  size **  imp **
1.174     schwarze  138:
1.82      schwarze  139: - .Bd -filled should not be the same as .Bd -ragged, but align both
                    140:   the left and right margin.  In groff, it is implemented in terms
                    141:   of .ad b, which we don't have either.  Found in cksum(1).
1.184     schwarze  142:   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
1.22      schwarze  143:
1.10      kristaps  144: - implement blank `Bl -column', such as
                    145:   .Bl -column
                    146:   .It foo Ta bar
                    147:   .El
1.184     schwarze  148:   loc *  exist ***  algo ***  size *  imp *
1.11      kristaps  149:
                    150: - explicitly disallow nested `Bl -column', which would clobber internal
                    151:   flags defined for struct mdoc_macro
1.184     schwarze  152:   loc *  exist *  algo *  size *  imp **
1.102     schwarze  153:
                    154: - In .Bl -column .It, the end of the line probably has to be regarded
                    155:   as an implicit .Ta, if there could be one, see the following mildly
                    156:   ugly code from login.conf(5):
                    157:     .Bl -column minpasswordlen program xetcxmotd
                    158:     .It path Ta path Ta value of Dv _PATH_DEFPATH
                    159:     .br
                    160:     Default search path.
                    161:   reported by Michal Mazurek <akfaew at jasminek dot net>
                    162:   via jmc@ Thu, 7 Apr 2011 16:00:53 +0059
1.184     schwarze  163:   loc *  exist ***  algo **  size *  imp **
1.42      schwarze  164:
                    165: - inside `.Bl -column' phrases, punctuation is handled like normal
                    166:   text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."
                    167:
                    168: - inside `.Bl -column' phrases, TERMP_IGNDELIM handling by `Pf'
                    169:   is not safe, e.g. `.Bl -column .It Pf a b .' gives "ab."
                    170:   but should give "ab ."
1.12      kristaps  171:
1.20      kristaps  172: - prohibit `Nm' from having non-text HEAD children
                    173:   (e.g., NetBSD mDNSShared/dns-sd.1)
                    174:   (mdoc_html.c and mdoc_term.c `Nm' handlers can be slightly simplified)
1.109     schwarze  175:
1.174     schwarze  176: - support translated section names
                    177:   e.g. x11/scrotwm scrotwm_es.1:21:2: error: NAME section must be first
                    178:   that one uses NOMBRE because it is spanish...
                    179:   deraadt tends to think that section-dependent macro behaviour
                    180:   is a bad idea in the first place, so this may be irrelevant
1.184     schwarze  181:   loc **  exist **  algo **  size *  imp **
1.174     schwarze  182:
1.109     schwarze  183: - When there is free text in the SYNOPSIS and that free text contains
                    184:   the .Nm macro, groff somehow understands to treat the .Nm as an in-line
                    185:   macro, while mandoc treats it as a block macro and breaks the line.
                    186:   No idea how the logic for distinguishing in-line and block instances
                    187:   should be, needs investigation.
                    188:   uqs@  Thu, 2 Jun 2011 11:03:51 +0200
                    189:   uqs@  Thu, 2 Jun 2011 11:33:35 +0200
1.184     schwarze  190:   loc *  exist **  algo ***  size *  imp **
1.57      kristaps  191:
1.252     schwarze  192: --- missing man features -----------------------------------------------
1.258     schwarze  193:
1.252     schwarze  194: - groff_www(7) .MTO and .URL
                    195:   These macros were used by the GNU grep(1) man page.
1.258     schwarze  196:   The groff_www(7) manual page itself uses them, too.
1.252     schwarze  197:   We should probably *not* add them to mandoc.
                    198:   Just mentioning this here to keep track of the abuse.
                    199:   Laura Morales <lauretas at mail dot com> 20 Apr 2018 07:33:02 +0200
                    200:   loc **  exist *  algo *  size **  imp *
                    201:
1.79      schwarze  202: --- missing tbl features -----------------------------------------------
                    203:
1.255     schwarze  204: - vertical centering in cells vertically spanned with ^
                    205:   pali dot rohar at gmail dot com 16 Jul 2018 13:03:35 +0200
                    206:   loc *  exist ***  algo ***  size **  imp *
                    207:
1.208     schwarze  208: - support mdoc(7) and man(7) macros inside tbl(7) code;
                    209:   probably requires the parser reorg and letting tbl(7)
                    210:   use roff_node such that macro sets can mix;
1.233     schwarze  211:   informed by bapt@ that FreeBSD needs this: 3 Jan 2015 23:32:23 +0100
1.208     schwarze  212:   loc ***  exist **  algo ***  size **  imp ***
                    213:
1.171     schwarze  214: - look at the POSIX manuals in the books/man-pages-posix port,
1.283     schwarze  215:   they use some unsupported tbl(7) features, mostly macros in tbl(7).
1.184     schwarze  216:   loc *  exist **  algo **  size **  imp ***
1.171     schwarze  217:
1.230     schwarze  218: - look what Joerg Schilling manual pages use
                    219:   Thu, 19 Mar 2015 18:31:48 +0100
1.255     schwarze  220:
1.182     schwarze  221: --- missing eqn features -----------------------------------------------
1.209     schwarze  222:
                    223: - In a matrix, break the output line after each matrix line.
1.287     schwarze  224:   Found in the discussion at CDBUG 2015.  Suggested by Avi Weinstock.
                    225:   This may not be the ideal solution after all: eqn(7) matrices
                    226:   are lists of columns, so Avi's proposal would show each *column*
                    227:   on its own *line*, which is likely to cause confusion.
                    228:   A better solution, but much harder to implement, would be to
                    229:   actually show the coordinates of column vectors on different
                    230:   terminal output lines, using the clumnated output facilities
                    231:   developed for .Bl -tag, .Bl -column, and also used for tbl(7).
                    232:   loc *  exist *  algo **  size **  imp **
1.182     schwarze  233:
                    234: - The "size" keyword is parsed, but ignored by the formatter.
1.184     schwarze  235:   loc *  exist *  algo *  size *  imp *
1.182     schwarze  236:
                    237: - The spacing characters `~', `^', and tab are currently ignored,
                    238:   see User's Guide (Second Edition) page 2 section 4.
1.184     schwarze  239:   loc *  exist *  algo **  size *  imp **
1.182     schwarze  240:
                    241: - Mark and lineup are parsed and ignored,
                    242:   see User's Guide (Second Edition) page 5 section 15.
1.184     schwarze  243:   loc **  exist **  algo **  size **  imp **
1.238     schwarze  244:
                    245: - GNU eqn converts some operators to special characters, for example,
                    246:   input HYPHEN-MINUS becomes output \(mi, unless it is part of a
                    247:   quoted word.  mandoc(1) only does this when the operator is
                    248:   surrounded by blanks, not when it is part of an unquoted word.
                    249:   Also, check whether there are more such cases (e.g., +?).
                    250:   reported by bentley@  20 Jun 2017 02:04:29 -0600
1.252     schwarze  251:   loc *  exist **  algo **  size *  imp *
1.182     schwarze  252:
1.239     schwarze  253: - Primes, opprime, and '
                    254:   bentley@  Thu, 13 Jul 2017 23:14:20 -0600
                    255:
1.79      schwarze  256: --- missing misc features ----------------------------------------------
1.301     schwarze  257:
                    258: - -T man does not handle eqn(7) and tbl(7)
                    259:   Stephen Gregoratto 16 Feb 2020 01:28:07 +1100
                    260:   loc **  exist **  algo **  size ***  imp **
1.255     schwarze  261:
                    262: - man -ks 1,8 route; kn@ Jul 13, 2018 orally
1.159     schwarze  263:
                    264: - italic correction (\/) in PostScript mode
                    265:   Werner LEMBERG on groff at gnu dot org  Sun, 10 Nov 2013 12:47:46
1.184     schwarze  266:   loc **  exist **  algo *  size *  imp *
1.153     schwarze  267:
1.210     schwarze  268: - change the default PAGER to more -Es and use the pager
                    269:   even for apropos title line output; req by bapt@
                    270:   loc *  exist *  algo *  size *  imp ***
1.171     schwarze  271:
1.79      schwarze  272: - clean up escape sequence handling, creating three classes:
                    273:   (1) fully implemented, or parsed and ignored without loss of content
                    274:   (2) unimplemented, potentially causing loss of content
                    275:       or serious mangling of formatting (e.g. \n) -> ERROR
                    276:       see textproc/mgdiff(1) for nice examples
                    277:   (3) undefined, just output the character -> perhaps WARNING
1.184     schwarze  278:   loc ***  exist **  algo **  size **  imp *** (parser reorg helps)
1.83      schwarze  279:
1.174     schwarze  280: - kettenis wants base roff, ms, and me  Fri, 1 Jan 2010 22:13:15 +0100 (CET)
1.184     schwarze  281:   loc **  exist **  algo **  size ***  imp *
1.174     schwarze  282:
                    283: --- compatibility checks -----------------------------------------------
1.196     schwarze  284:
1.174     schwarze  285: - is .Bk implemented correctly in modern groff?
                    286:   sobrado@  Tue, 19 Apr 2011 22:12:55 +0200
                    287:
1.175     schwarze  288: - compare output to Heirloom roff, Solaris roff, and
                    289:   http://repo.or.cz/w/neatroff.git  http://litcave.rudi.ir/
1.178     schwarze  290:
                    291: - look at AT&T DWB http://www2.research.att.com/sw/download
                    292:   Carsten Kunze <carsten dot kunze at arcor dot de> has patches
                    293:   Mon, 4 Aug 2014 17:01:28 +0200
1.230     schwarze  294:   ported version: https://github.com/n-t-roff/DWB3.3
                    295:   Carsten Kunze  Wed, 22 Apr 2015 11:21:43 +0200
1.174     schwarze  296:
1.79      schwarze  297: - look at pages generated from reStructeredText, e.g. devel/mercurial hg(1)
                    298:   These are a weird mixture of man(7) and custom autogenerated low-level
                    299:   roff stuff.  Figure out to what extent we can cope.
1.80      schwarze  300:   For details, see http://docutils.sourceforge.net/rst.html
1.79      schwarze  301:   noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200
                    302:   reminded by nicm@  Mon, 3 May 2010 09:52:41 +0100
1.160     schwarze  303:
1.174     schwarze  304: - look at pages generated from ronn(1) github.com/rtomayko/ronn
                    305:   (based on markdown)
                    306:
1.160     schwarze  307: - look at pages generated from Texinfo source by yat2m, e.g. security/gnupg
                    308:   First impression is not that bad.
1.172     schwarze  309:
                    310: - look at pages generated by pandoc; see
                    311:   https://github.com/jgm/pandoc/blob/master/src/Text/Pandoc/Writers/Man.hs
                    312:   porting planned by kili@  Thu, 19 Jun 2014 19:46:28 +0200
1.71      schwarze  313:
                    314: - check compatibility with Plan9:
                    315:   http://swtch.com/usr/local/plan9/tmac/tmac.an
                    316:   http://swtch.com/plan9port/man/man7/man.html
                    317:   "Anthony J. Bentley" <anthonyjbentley@gmail.com> 28 Dec 2010 21:58:40 -0700
1.63      schwarze  318:
1.207     schwarze  319: - check compatibility with COHERENT troff:
                    320:   http://www.nesssoftware.com/home/mwc/source.php
                    321:
1.174     schwarze  322: - check compatibility with the man(7) formatter
                    323:   https://raw.githubusercontent.com/rofl0r/hardcore-utils/master/man.c
                    324:
1.186     schwarze  325: - check compatibility with
                    326:   http://ikiwiki.info/plugins/contrib/mandoc/
                    327:   https://github.com/schmonz/ikiwiki/compare/mandoc
                    328:   Amitai Schlair  Mon, 19 May 2014 14:05:53 -0400
1.295     schwarze  329:
                    330: - check compatibility with
                    331:   https://git.sr.ht/~sircmpwn/scdoc
1.186     schwarze  332:
1.230     schwarze  333: - check features of the Slackware man.conf(5) format
                    334:   Carsten Kunze  Wed, 11 Mar 2015 17:57:24 +0100
                    335:
1.1       kristaps  336: ************************************************************************
                    337: * formatting issues: ugly output
                    338: ************************************************************************
1.87      kristaps  339:
1.195     schwarze  340: - revisit empty in-line macros
                    341:   look at the difference between "Em x Em ." and "Sq x Em ."
                    342:   Carsten Kunze  Fri, 12 Dec 2014 00:15:41 +0100
                    343:   loc *** exist *** algo *** size * imp **
                    344:
                    345: - a column list with blank `Ta' cells triggers a spurious
1.87      kristaps  346:   start-with-whitespace printing of a newline
1.195     schwarze  347:
                    348: - In .Bl -column, .It a<tab>"b<tab>c"
                    349:   shows the quotes in groff, but not in mandoc
                    350:   loc * exist *** algo ** size * imp **
1.1       kristaps  351:
1.39      schwarze  352: - In .Bl -column,
                    353:   .It Em Authentication<tab>Key Length
                    354:   ought to render "Key Length" with emphasis, too,
                    355:   see OpenBSD iked.conf(5).
1.123     schwarze  356:   reported again Nicolas Joly via wiz@ Wed, 12 Oct 2011 00:20:00 +0200
1.184     schwarze  357:   loc *  exist ***  algo ***  size **  imp ***
1.39      schwarze  358:
1.1       kristaps  359: - empty phrases in .Bl column produce too few blanks
                    360:   try e.g. .Bl -column It Ta Ta
                    361:   reported by millert Fri, 02 Apr 2010 16:13:46 -0400
1.184     schwarze  362:   loc *  exist ***  algo ***  size *  imp **
1.48      schwarze  363:
1.83      schwarze  364: - .%T can have trailing punctuation.  Currently, it puts the trailing
                    365:   punctuation into a trailing MDOC_TEXT element inside its own scope.
                    366:   That element should rather be outside its scope, such that the
                    367:   punctuation does not get underlines.  This is not trivial to
                    368:   implement because .%T then needs some features of in_line_eoln() -
                    369:   slurp all arguments into one single text element - and one feature
                    370:   of in_line() - put trailing punctuation out of scope.
                    371:   Found in mount_nfs(8) and exports(5), search for "Appendix".
1.184     schwarze  372:   loc **  exist **  algo ***  size *  imp **
1.83      schwarze  373:
1.147     schwarze  374: - Trailing punctuation after .%T triggers EOS spacing, at least
                    375:   outside .Rs (eek!).  Simply setting ARGSFL_DELIM for .%T is not
                    376:   the right solution, it sends mandoc into an endless loop.
                    377:   reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
1.184     schwarze  378:   loc *  exist **  algo **  size *  imp **
1.147     schwarze  379:
1.174     schwarze  380: - global variables in the SYNOPSIS of section 3 pages
                    381:   .Vt vs .Vt/.Va vs .Ft/.Va vs .Ft/.Fa ...
                    382:   from kristaps@  Tue, 08 Jun 2010 11:13:32 +0200
1.239     schwarze  383:
                    384: - implicit whitespace around inline equations
                    385:   example code:  where '$times$' denotes matrix multiplication
                    386:   must not have an HTML line break, nor a blank, before <math>
                    387:   partial solution: html.c {"math", HTML_NLINSIDE | HTML_INDENT},
                    388:   bentley@  Thu, 13 Jul 2017 19:00:59 -0600
1.174     schwarze  389:
1.48      schwarze  390: - in enclosures, mandoc sometimes fancies a bogus end of sentence
                    391:   reminded by jmc@  Thu, 23 Sep 2010 18:13:39 +0059
1.184     schwarze  392:   loc *  exist **  algo ***  size *  imp ***
1.197     schwarze  393:
                    394: - a line starting with "\fB something" counts as starting with whitespace
                    395:   and triggers a line break; found in audio/normalize-mp3(1)
1.287     schwarze  396:   This will become easier once escape sequences are represented
                    397:   by syntax tree nodes.
1.197     schwarze  398:   loc **  exist *  algo **  size *  imp **
1.149     schwarze  399:
                    400: - formatting /usr/local/man/man1/latex2man.1 with groff and mandoc
                    401:   reveals lots of bugs both in groff and mandoc...
                    402:   reported by bentley@  Wed, 22 May 2013 23:49:30 -0600
1.171     schwarze  403:
1.230     schwarze  404: --- PostScript and PDF issues ------------------------------------------
1.171     schwarze  405:
                    406: - PDF output doesn't use a monospaced font for .Bd -literal
                    407:   Example: "mandoc -Tpdf afterboot.8 > output.pdf && pdfviewer output.pdf".
                    408:   Search the text "Routing tables".
                    409:   Also check what PostScript mode does when fixing this.
                    410:   reported by juanfra@ Wed, 04 Jun 2014 21:44:58 +0200
1.186     schwarze  411:   instructions from juanfra@  Wed, 11 Jun 2014 02:21:01 +0200
                    412:     add a new <</Type /Font>> block to the PDF files with /BaseFont /Courier
                    413:     and change the /Name from /F0 to the new font (/F5 (?)).
1.230     schwarze  414:   re-reported by tb@ Mon, 16 Mar 2015 16:47:21 +0100
1.186     schwarze  415:   loc *  exist **  algo **  size *  imp **
1.173     schwarze  416:
                    417: --- HTML issues --------------------------------------------------------
1.297     schwarze  418:
                    419: - get rid of the last handful of style= attributes such that
                    420:   Content-Security-Policy: can be enabled without unsafe-inline
                    421:   suggested by bentley@  Nov 10, 2019 at 06:02:49AM -0700
                    422:   loc *  exist *  algo *  size *  imp **
1.214     schwarze  423:
                    424: - .Bf at the beginning of a paragraph inserts a bogus 1ex horizontal
                    425:   space, see for example random(3).  Introduced in
                    426:   http://mdocml.bsd.lv/cgi-bin/cvsweb/mdoc_html.c.diff?r1=1.91&r2=1.92
                    427:   reported by deraadt@ Mon, 28 Sep 2015 20:14:13 -0600 (MDT)
                    428:   loc **  exist **  algo **  size *  imp *
1.180     schwarze  429:
1.187     schwarze  430: - jsg on icb, Nov 3, 2014:
                    431:   try to guess Xr in man(7) for hyperlinking
1.226     schwarze  432:   and render them with <a class="Xr" href=...>
                    433:   https://github.com/Debian/debiman/issues/15
                    434:   loc *  exist *  algo **  size **  imp **
1.296     schwarze  435:
                    436: - space characters can end up in href= attributes, for example coming
                    437:   from the first .Xr argument (where they make no sense, but still);
                    438:   does this affect other characters, other source macros...?
                    439:   Jackson Pauls  29 Aug 2017 16:56:27 +0100
1.187     schwarze  440:
1.180     schwarze  441: - The tables used to render the three-part page headers actually force
                    442:   the width of the <body> to the max-width given for <html>.
                    443:   Not yet sure how to fix that...
                    444:   Observed by an Anonymous Coward on undeadly.org:
                    445:   http://undeadly.org/cgi?action=article&sid=20140925064244&pid=1
1.184     schwarze  446:   loc *  exist *  algo **  size *  imp ***
1.206     schwarze  447:
                    448: - generate <img> tags in HTML
                    449:   idea from florian@  Tue, 7 Apr 2015 00:26:28 +0000
                    450:   may be possible to implement with .Lk img://something.png alt_text
1.174     schwarze  451:
1.173     schwarze  452: - check https://github.com/trentm/mdocml
1.35      kristaps  453:
1.1       kristaps  454: ************************************************************************
1.104     kristaps  455: * formatting issues: gratuitous differences
1.1       kristaps  456: ************************************************************************
1.187     schwarze  457:
                    458: - .Fn reopens a new scope after punctuation in mandoc,
                    459:   but closes its scope for good in groff.
                    460:   Do we want to change mandoc or groff?
                    461:   Steffen Nurpmeso  Sat, 08 Nov 2014 13:34:59 +0100
                    462:   loc *  exist **  algo **  size *  imp **
1.230     schwarze  463:
1.174     schwarze  464: - In .Bl -enum -width 0n, groff continues one the same line after
                    465:   the number, mandoc breaks the line.
                    466:   mail to kristaps@  Mon, 20 Jul 2009 02:21:39 +0200
1.184     schwarze  467:   loc *  exist **  algo **  size *  imp **
1.174     schwarze  468:
1.103     schwarze  469: - .Pp between two .It in .Bl -column should produce one,
                    470:   not two blank lines, see e.g. login.conf(5).
                    471:   reported by jmc@  Sun, 17 Apr 2011 14:04:58 +0059
1.129     schwarze  472:   reported again by sthen@  Wed, 18 Jan 2012 02:09:39 +0000 (UTC)
1.184     schwarze  473:   loc *  exist ***  algo **  size *  imp **
1.39      schwarze  474:
1.83      schwarze  475: - If the *first* line after .It is .Pp, break the line right after
                    476:   the tag, do not pad with space characters before breaking.
                    477:   See the description of the a, c, and i commands in sed(1).
1.184     schwarze  478:   loc *  exist **  algo **  size *  imp **
1.83      schwarze  479:
                    480: - If the first line after .It is .D1, do not assert a blank line
                    481:   in between, see for example tmux(1).
                    482:   reported by nicm@  13 Jan 2011 00:18:57 +0000
1.184     schwarze  483:   loc *  exist **  algo **  size *  imp **
1.147     schwarze  484:
                    485: - Trailing punctuation after .It should trigger EOS spacing.
                    486:   reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
                    487:   Probably, this should be fixed somewhere in termp_it_pre(), not sure.
1.184     schwarze  488:   loc *  exist **  algo **  size *  imp **
1.83      schwarze  489:
                    490: - When the -width string contains macros, the macros must be rendered
                    491:   before measuring the width, for example
                    492:     .Bl -tag -width ".Dv message"
                    493:   in magic(5), located in src/usr.bin/file, is the same
                    494:   as -width 7n, not -width 11n.
1.129     schwarze  495:   The same applies to .Bl -column column widths;
                    496:   reported again by Nicolas Joly Thu, 1 Mar 2012 13:41:26 +0100 via wiz@ 5 Mar
1.157     schwarze  497:   reported again by Franco Fichtner Fri, 27 Sep 2013 21:02:28 +0200
1.234     schwarze  498:   reported again by Bruce Evans Fri, 17 Feb 2017 21:22:44 +0100 via bapt@
1.184     schwarze  499:   loc ***  exist ***  algo ***  size **  imp ***
1.157     schwarze  500:   An easy partial fix would be to just skip the first word if it starts
                    501:   with a dot, including any following white space, when measuring.
1.184     schwarze  502:   loc *  exist *  algo *  size *  imp ***
1.83      schwarze  503:
1.56      schwarze  504: - The \& zero-width character counts as output.
                    505:   That is, when it is alone on a line between two .Pp,
                    506:   we want three blank lines, not two as in mandoc.
1.184     schwarze  507:   loc **  exist **  algo **  size *  imp **
1.83      schwarze  508:
1.205     schwarze  509: - Sequences of multiple man(7) paragraphs (.PP, .IP) interspersed
                    510:   with .ps and .nf/.fi produce execessive blank lines, see libJudy
1.207     schwarze  511:   and graphics/dcmtk.  The parser reorg may help with this.
1.83      schwarze  512:
                    513: - trailing whitespace must be ignored even when followed by a font escape,
1.198     schwarze  514:   see for example
1.83      schwarze  515:     makes
                    516:     \fBdig \fR
                    517:     operate in batch mode
                    518:   in dig(1).
1.184     schwarze  519:   loc **  exist **  algo **  size *  imp **
1.166     schwarze  520:
                    521: ************************************************************************
                    522: * warning issues
                    523: ************************************************************************
1.251     schwarze  524:
                    525: - warn about duplicate .Sh/.Ss heads
                    526:   gre(4): Rename duplicate sections 20 Apr 2018 15:27:33 +0200
1.252     schwarze  527:   loc *  exist *  algo *  size *  imp **
1.216     schwarze  528:
1.245     schwarze  529: - style message about macros inside .Bd -literal and .Dl, in particular
                    530:   font changing macros like .Cm, .Ar, .Fa (from the mdoclint TODO)
                    531:
1.246     schwarze  532: - style message about mismatches between the section number in the
                    533:   file name (if it is known) and the section number in .Dt
                    534:   (from the mdoclint TODO)
                    535:
1.245     schwarze  536: - style message about NULL without .Dv (from the mdoclint TODO)
                    537:
                    538: - style message about error constants without .Er (from the mdoclint TODO)
                    539:
1.211     schwarze  540: - warn when .Sh or .Ss contain other macros
                    541:   Steffen Nurpmeso, savannah.gnu.org/bugs/index.php?45034
1.210     schwarze  542:   loc *  exist *  algo *  size *  imp **
1.188     schwarze  543:
1.245     schwarze  544: - style message about violations of the convention
1.246     schwarze  545:   .An name Aq Mt localpart@domain in AUTHORS (from the mdoclint TODO)
1.245     schwarze  546:
1.188     schwarze  547: - warn about attempts to call non-callable macros
                    548:   Steffen Nurpmeso  Tue, 11 Nov 2014 22:55:16 +0100
                    549:   Note that formatting is inconsistent in groff.
                    550:   .Fn Po prints "Po()", .Ar Sh prints "file ..." and no "Sh".
                    551:   Relatively hard because the relevant code is scattered
                    552:   all over mdoc_macro.c and all subtly different.
                    553:   loc **  exist **  algo **  size **  imp **
1.245     schwarze  554:
1.246     schwarze  555: - warn about punctuation - e.g. ',' and ';' - at the beginning
                    556:   of a text line, if it is likely intended to follow the preceding
                    557:   output without intervening whitespace, in particular after a
                    558:   macro line (from the mdoclint TODO)
1.257     schwarze  559:
                    560: - makewhatis -p complains about language subdirectories:
                    561:   /usr/local/man//ru: Unknown directory part
                    562:
1.174     schwarze  563:
                    564: ************************************************************************
                    565: * documentation issues
                    566: ************************************************************************
                    567:
                    568: - mark macros as: page structure domain, manual domain, general text domain
                    569:   is this useful?
                    570:
                    571: - mention /usr/share/misc/mdoc.template in mdoc(7)?
1.185     schwarze  572:
                    573: - Is all the content from http://www.std.com/obi/BSD/doc/usd/28.tbl/tbl
                    574:   covered in tbl(7)?
1.1       kristaps  575:
1.9       kristaps  576: ************************************************************************
                    577: * performance issues
                    578: ************************************************************************
                    579:
1.37      kristaps  580: - the PDF file is HUGE: this can be reduced by using relative offsets
1.115     kristaps  581:
1.23      kristaps  582: ************************************************************************
                    583: * structural issues
                    584: ************************************************************************
1.221     schwarze  585:
                    586: - POSIX says in the documentation of sysconf(3) that PATH_MAX
                    587:   is allowed to be so large that it is a bad idea to use it
                    588:   for sizing static buffers.  So use dynamic buffers throughout.
                    589:   See the file test-PATH_MAX.c for details.
                    590:   Found by Aaron M. Ucko in the GNU Hurd via Bdale Garbee,
                    591:   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829624
1.67      schwarze  592:
1.241     schwarze  593: - Is it possible to further simplify ENDBODY_SPACE?
                    594:
1.67      schwarze  595: - Find better ways to prevent endless loops
                    596:   in roff(7) macro and string expansion.
1.241     schwarze  597:
                    598: - make buffers for parsing functions const
                    599:   christos@ via wiz@  Fri, 18 Dec 2015 17:10:01 +0100
1.186     schwarze  600:
                    601: - struct mparse refactoring
                    602:   Steffen Nurpmeso  Thu, 04 Sep 2014 12:50:00 +0200
1.170     schwarze  603:
1.179     kristaps  604: ************************************************************************
                    605: * CGI issues
                    606: ************************************************************************
                    607:
1.302     schwarze  608:  - Inspect httpd(8) logs on man.openbsd.org and consider
                    609:    whether logging can be improved, where bad syntax comes from,
                    610:    and what needs to be done to get rid of COMPAT_OLDURI.
1.179     kristaps  611:  - Enable HTTP compression by detecting gzip encoding and filtering
                    612:    output through libz.
1.256     schwarze  613:  - Privilege separation (see OpenSSH).
1.179     kristaps  614:  - Enable caching support via HTTP 304 and If-Modified-Since.
1.181     kristaps  615:
1.192     schwarze  616: ************************************************************************
                    617: * to improve in the groff_mdoc(7) macros
                    618: ************************************************************************
1.298     schwarze  619:
                    620: - delete OS release verification from .Dx, .Fx, .Nx, .Ox etc.
                    621:   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=629161
                    622:   also Branden Robinson 18 Dec 2019 00:59:52 +1100
1.299     schwarze  623:
                    624: - Can the distinction between .Vt and .Va be made stricter,
                    625:   recommending .Vt extern char * Ns Va optarg ; ?
                    626:   What about the block macro properties of .Vt in the SYNOPSIS?
                    627:   zeurkous 25 Dec 2019 08:48:36 +0100
1.252     schwarze  628:
                    629: - .Cd # arch1, arch2 in section 4 pages:
                    630:   find better way to indicate multiple architectures, maybe:
                    631:   allow .Dt vgafb 4 "macppc sparc64"
                    632:   already shown as "Device Drivers Manual (macppc sparc64)"
                    633:   for apropos, make that "vgafb(4) - macppc # sparc64" instead of "- all"
                    634:   groff can be made to show multiple arches, too, but it is
                    635:   tedious to do the string parsing in roff code...
                    636:   jmc@ 23 Apr 2018 07:24:52 +0100 [man for vgafb(4)...]
                    637:   loc **  exist **  algo *  size *  imp ***
1.192     schwarze  638:
                    639: - use uname(1) to set doc-default-operating-system at install time
                    640:   tobimensch  Mon, 1 Dec 2014 00:25:07 +0100
1.236     schwarze  641:
                    642: - apostrophe (39), circumflex (94), grave (96), tilde (126)
                    643:   in manuals: \(aq, \(ha, \`, \(ti
                    644:   Re: [Groff] ASCII Minus Sign in man Pages.
                    645:   bentley@ 26 Apr 2017 10:02:06 -0600
                    646:   Do we need to fix existing manuals?
                    647:   Do we need to fix the definition of the mdoc(7) language?

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