TODO

   1 ************************************************************************
   2 * Official mandoc TODO.
   3 * $Id: TODO,v 1.242 2017/07/20 12:54:02 schwarze Exp $
   4 ************************************************************************
   5
   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.
  34
  35 ************************************************************************
  36 * missing features
  37 ************************************************************************
  38
  39 --- missing roff features ----------------------------------------------
  40
  41 - .ad (adjust margins)
  42   .ad l -- adjust left margin only (flush left)
  43   .ad r -- adjust right margin only (flush right)
  44   .ad c -- center text on line
  45   .ad b -- adjust both margins (alias: .ad n)
  46   .na   -- temporarily disable adjustment without changing the mode
  47   .ad   -- re-enable adjustment without changing the mode
  48   Adjustment mode is ignored while in no-fill mode (.nf).
  49   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
  50
  51 - .fc (field control)
  52   found by naddy@ in xloadimage(1)
  53   loc **  exist ***  algo *  size *  imp *
  54
  55 - .nr third argument (auto-increment step size, requires \n+)
  56   found by bentley@ in sbcl(1)  Mon, 9 Dec 2013 18:36:57 -0700
  57   loc *  exist *  algo *  size *  imp **
  58
  59 - .ns (no-space mode) occurs in xine-config(1)
  60   when implementing this, also let .TH set it
  61   reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500
  62   loc ***  exist ***  algo ***  size **  imp *
  63
  64 - .while and .shift
  65   found by jca@ in ratpoison(1)  Sun, 30 Jun 2013 12:01:09 +0200
  66   loc *  exist **  algo **  size **  imp **
  67
  68 - \n+ and \n- numerical register increment and decrement
  69   found by bentley@ in sbcl(1)  Mon, 9 Dec 2013 18:36:57 -0700
  70   loc *  exist *  algo *  size *  imp **
  71
  72 - \w'' improve width measurements
  73   would not be very useful without an expression parser, see below
  74   needed for Tcl_NewStringObj(3) via wiz@  Wed, 5 Mar 2014 22:27:43 +0100
  75   loc **  exist ***  algo ***  size *  imp ***
  76
  77 - \\ in high-level macro arguments
  78   Currently, \\ is expanded in two situations:
  79   1) macro and string definition (roff.c setstrn())
  80   2) macro argument parsing (mandoc.c mandoc_getarg())
  81   For user defined macros, the second happens in time because of ROFF_REPARSE.
  82   But for standard high-level macros, it only happens after entering the
  83   high level parsers, which is too late because the code doesn't get
  84   back to roff.c roff_res() from that point.  Because this requires
  85   distinguishing requests, user-defined macros and standard macros
  86   on the roff_res() level, it is hard to solve without the parser reorg.
  87   Found by naddy@ in devel/cutils cobfusc(1)  Mon, 16 Feb 2015 19:10:52 +0100
  88   loc ***  exist ***  algo ***  size **  imp *
  89
  90 - using undefined strings or macros defines them to be empty
  91   wl@  Mon, 14 Nov 2011 14:37:01 +0000
  92   loc *  exist *  algo *  size *  imp *
  93
  94 --- missing mdoc features ----------------------------------------------
  95
  96 - .Bl -column .Xo support is missing
  97   ultimate goal:
  98   restore .Xr and .Dv to
  99   lib/libc/compat-43/sigvec.3
 100   lib/libc/gen/signal.3
 101   lib/libc/sys/sigaction.2
 102   loc *  exist ***  algo ***  size *  imp **
 103
 104 - edge case: decide how to deal with blk_full bad nesting, e.g.
 105   .Sh .Nm .Bk .Nm .Ek .Sh found by jmc@ in ssh-keygen(1)
 106   from jmc@  Wed, 14 Jul 2010 18:10:32 +0100
 107   loc *  exist ***  algo ***  size **  imp **
 108
 109 - .Bd -centered implies -filled, not -unfilled, which is not
 110   easy to implement; it requires code similar to .ce, which
 111   we don't have either.
 112   Besides, groff has bug causing text right *before* .Bd -centered
 113   to be centered as well.
 114   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
 115
 116 - .Bd -filled should not be the same as .Bd -ragged, but align both
 117   the left and right margin.  In groff, it is implemented in terms
 118   of .ad b, which we don't have either.  Found in cksum(1).
 119   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
 120
 121 - implement blank `Bl -column', such as
 122   .Bl -column
 123   .It foo Ta bar
 124   .El
 125   loc *  exist ***  algo ***  size *  imp *
 126
 127 - explicitly disallow nested `Bl -column', which would clobber internal
 128   flags defined for struct mdoc_macro
 129   loc *  exist *  algo *  size *  imp **
 130
 131 - In .Bl -column .It, the end of the line probably has to be regarded
 132   as an implicit .Ta, if there could be one, see the following mildly
 133   ugly code from login.conf(5):
 134     .Bl -column minpasswordlen program xetcxmotd
 135     .It path Ta path Ta value of Dv _PATH_DEFPATH
 136     .br
 137     Default search path.
 138   reported by Michal Mazurek <akfaew at jasminek dot net>
 139   via jmc@ Thu, 7 Apr 2011 16:00:53 +0059
 140   loc *  exist ***  algo **  size *  imp **
 141
 142 - inside `.Bl -column' phrases, punctuation is handled like normal
 143   text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."
 144
 145 - inside `.Bl -column' phrases, TERMP_IGNDELIM handling by `Pf'
 146   is not safe, e.g. `.Bl -column .It Pf a b .' gives "ab."
 147   but should give "ab ."
 148
 149 - check whether it is correct that `D1' uses INDENT+1;
 150   does it need its own constant?
 151   loc *  exist **  algo **  size *  imp **
 152
 153 - prohibit `Nm' from having non-text HEAD children
 154   (e.g., NetBSD mDNSShared/dns-sd.1)
 155   (mdoc_html.c and mdoc_term.c `Nm' handlers can be slightly simplified)
 156
 157 - support translated section names
 158   e.g. x11/scrotwm scrotwm_es.1:21:2: error: NAME section must be first
 159   that one uses NOMBRE because it is spanish...
 160   deraadt tends to think that section-dependent macro behaviour
 161   is a bad idea in the first place, so this may be irrelevant
 162   loc **  exist **  algo **  size *  imp **
 163
 164 - When there is free text in the SYNOPSIS and that free text contains
 165   the .Nm macro, groff somehow understands to treat the .Nm as an in-line
 166   macro, while mandoc treats it as a block macro and breaks the line.
 167   No idea how the logic for distinguishing in-line and block instances
 168   should be, needs investigation.
 169   uqs@  Thu, 2 Jun 2011 11:03:51 +0200
 170   uqs@  Thu, 2 Jun 2011 11:33:35 +0200
 171   loc *  exist **  algo ***  size *  imp **
 172
 173 --- missing tbl features -----------------------------------------------
 174
 175 - the "s" layout column specifier is used for placement of data
 176   into columns, but ignored during column width calculations
 177   synaptics(4) found by tedu@  Mon, 17 Aug 2015 21:17:42 -0400
 178   loc *  exist **  algo ***  size *  imp **
 179
 180 - support mdoc(7) and man(7) macros inside tbl(7) code;
 181   probably requires the parser reorg and letting tbl(7)
 182   use roff_node such that macro sets can mix;
 183   informed by bapt@ that FreeBSD needs this: 3 Jan 2015 23:32:23 +0100
 184   loc ***  exist **  algo ***  size **  imp ***
 185
 186 - look at the POSIX manuals in the books/man-pages-posix port,
 187   they use some unsupported tbl(7) features.
 188   loc *  exist **  algo **  size **  imp ***
 189
 190 - look what Joerg Schilling manual pages use
 191   Thu, 19 Mar 2015 18:31:48 +0100
 192
 193 - use Unicode U+2500 to U+256C for table borders
 194   in tbl(7) -Tutf-8 output
 195   suggested by bentley@  Tue, 14 Oct 2014 04:10:55 -0600
 196   loc *  exist **  algo *  size *  imp **
 197
 198 --- missing eqn features -----------------------------------------------
 199
 200 - In a matrix, break the output line after each matrix line.
 201   Found in the discussion at CDBUG 2015.
 202   Suggested by Avi Weinstock.
 203   loc *  exist *  algo *  size *  imp **
 204
 205 - The "size" keyword is parsed, but ignored by the formatter.
 206   loc *  exist *  algo *  size *  imp *
 207
 208 - The spacing characters `~', `^', and tab are currently ignored,
 209   see User's Guide (Second Edition) page 2 section 4.
 210   loc *  exist *  algo **  size *  imp **
 211
 212 - Mark and lineup are parsed and ignored,
 213   see User's Guide (Second Edition) page 5 section 15.
 214   loc **  exist **  algo **  size **  imp **
 215
 216 - GNU eqn converts some operators to special characters, for example,
 217   input HYPHEN-MINUS becomes output \(mi, unless it is part of a
 218   quoted word.  mandoc(1) only does this when the operator is
 219   surrounded by blanks, not when it is part of an unquoted word.
 220   Also, check whether there are more such cases (e.g., +?).
 221   reported by bentley@  20 Jun 2017 02:04:29 -0600
 222
 223 - Primes, opprime, and '
 224   bentley@  Thu, 13 Jul 2017 23:14:20 -0600
 225
 226 --- missing misc features ----------------------------------------------
 227
 228 - italic correction (\/) in PostScript mode
 229   Werner LEMBERG on groff at gnu dot org  Sun, 10 Nov 2013 12:47:46
 230   loc **  exist **  algo *  size *  imp *
 231
 232 - change the default PAGER to more -Es and use the pager
 233   even for apropos title line output; req by bapt@
 234   loc *  exist *  algo *  size *  imp ***
 235
 236 - clean up escape sequence handling, creating three classes:
 237   (1) fully implemented, or parsed and ignored without loss of content
 238   (2) unimplemented, potentially causing loss of content
 239       or serious mangling of formatting (e.g. \n) -> ERROR
 240       see textproc/mgdiff(1) for nice examples
 241   (3) undefined, just output the character -> perhaps WARNING
 242   loc ***  exist **  algo **  size **  imp *** (parser reorg helps)
 243
 244 - kettenis wants base roff, ms, and me  Fri, 1 Jan 2010 22:13:15 +0100 (CET)
 245   loc **  exist **  algo **  size ***  imp *
 246
 247 --- compatibility checks -----------------------------------------------
 248
 249 - is .Bk implemented correctly in modern groff?
 250   sobrado@  Tue, 19 Apr 2011 22:12:55 +0200
 251
 252 - compare output to Heirloom roff, Solaris roff, and
 253   http://repo.or.cz/w/neatroff.git  http://litcave.rudi.ir/
 254
 255 - look at AT&T DWB http://www2.research.att.com/sw/download
 256   Carsten Kunze <carsten dot kunze at arcor dot de> has patches
 257   Mon, 4 Aug 2014 17:01:28 +0200
 258   ported version: https://github.com/n-t-roff/DWB3.3
 259   Carsten Kunze  Wed, 22 Apr 2015 11:21:43 +0200
 260
 261 - look at pages generated from reStructeredText, e.g. devel/mercurial hg(1)
 262   These are a weird mixture of man(7) and custom autogenerated low-level
 263   roff stuff.  Figure out to what extent we can cope.
 264   For details, see http://docutils.sourceforge.net/rst.html
 265   noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200
 266   reminded by nicm@  Mon, 3 May 2010 09:52:41 +0100
 267
 268 - look at pages generated from ronn(1) github.com/rtomayko/ronn
 269   (based on markdown)
 270
 271 - look at pages generated from Texinfo source by yat2m, e.g. security/gnupg
 272   First impression is not that bad.
 273
 274 - look at pages generated by pandoc; see
 275   https://github.com/jgm/pandoc/blob/master/src/Text/Pandoc/Writers/Man.hs
 276   porting planned by kili@  Thu, 19 Jun 2014 19:46:28 +0200
 277
 278 - check compatibility with Plan9:
 279   http://swtch.com/usr/local/plan9/tmac/tmac.an
 280   http://swtch.com/plan9port/man/man7/man.html
 281   "Anthony J. Bentley" <anthonyjbentley@gmail.com> 28 Dec 2010 21:58:40 -0700
 282
 283 - check compatibility with COHERENT troff:
 284   http://www.nesssoftware.com/home/mwc/source.php
 285
 286 - check compatibility with the man(7) formatter
 287   https://raw.githubusercontent.com/rofl0r/hardcore-utils/master/man.c
 288
 289 - check compatibility with
 290   http://ikiwiki.info/plugins/contrib/mandoc/
 291   https://github.com/schmonz/ikiwiki/compare/mandoc
 292   Amitai Schlair  Mon, 19 May 2014 14:05:53 -0400
 293
 294 - check features of the Slackware man.conf(5) format
 295   Carsten Kunze  Wed, 11 Mar 2015 17:57:24 +0100
 296
 297 ************************************************************************
 298 * formatting issues: ugly output
 299 ************************************************************************
 300
 301 - revisit empty in-line macros
 302   look at the difference between "Em x Em ." and "Sq x Em ."
 303   Carsten Kunze  Fri, 12 Dec 2014 00:15:41 +0100
 304   loc *** exist *** algo *** size * imp **
 305
 306 - a column list with blank `Ta' cells triggers a spurious
 307   start-with-whitespace printing of a newline
 308
 309 - In .Bl -column, .It a<tab>"b<tab>c"
 310   shows the quotes in groff, but not in mandoc
 311   loc * exist *** algo ** size * imp **
 312
 313 - In .Bl -column,
 314   .It Em Authentication<tab>Key Length
 315   ought to render "Key Length" with emphasis, too,
 316   see OpenBSD iked.conf(5).
 317   reported again Nicolas Joly via wiz@ Wed, 12 Oct 2011 00:20:00 +0200
 318   loc *  exist ***  algo ***  size **  imp ***
 319
 320 - empty phrases in .Bl column produce too few blanks
 321   try e.g. .Bl -column It Ta Ta
 322   reported by millert Fri, 02 Apr 2010 16:13:46 -0400
 323   loc *  exist ***  algo ***  size *  imp **
 324
 325 - .%T can have trailing punctuation.  Currently, it puts the trailing
 326   punctuation into a trailing MDOC_TEXT element inside its own scope.
 327   That element should rather be outside its scope, such that the
 328   punctuation does not get underlines.  This is not trivial to
 329   implement because .%T then needs some features of in_line_eoln() -
 330   slurp all arguments into one single text element - and one feature
 331   of in_line() - put trailing punctuation out of scope.
 332   Found in mount_nfs(8) and exports(5), search for "Appendix".
 333   loc **  exist **  algo ***  size *  imp **
 334
 335 - Trailing punctuation after .%T triggers EOS spacing, at least
 336   outside .Rs (eek!).  Simply setting ARGSFL_DELIM for .%T is not
 337   the right solution, it sends mandoc into an endless loop.
 338   reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
 339   loc *  exist **  algo **  size *  imp **
 340
 341 - global variables in the SYNOPSIS of section 3 pages
 342   .Vt vs .Vt/.Va vs .Ft/.Va vs .Ft/.Fa ...
 343   from kristaps@  Tue, 08 Jun 2010 11:13:32 +0200
 344
 345 - implicit whitespace around inline equations
 346   example code:  where '$times$' denotes matrix multiplication
 347   must not have an HTML line break, nor a blank, before <math>
 348   partial solution: html.c {"math", HTML_NLINSIDE | HTML_INDENT},
 349   bentley@  Thu, 13 Jul 2017 19:00:59 -0600
 350
 351 - in enclosures, mandoc sometimes fancies a bogus end of sentence
 352   reminded by jmc@  Thu, 23 Sep 2010 18:13:39 +0059
 353   loc *  exist **  algo ***  size *  imp ***
 354
 355 - a line starting with "\fB something" counts as starting with whitespace
 356   and triggers a line break; found in audio/normalize-mp3(1)
 357   loc **  exist *  algo **  size *  imp **
 358
 359 - formatting /usr/local/man/man1/latex2man.1 with groff and mandoc
 360   reveals lots of bugs both in groff and mandoc...
 361   reported by bentley@  Wed, 22 May 2013 23:49:30 -0600
 362
 363 --- PostScript and PDF issues ------------------------------------------
 364
 365 - PDF output doesn't use a monospaced font for .Bd -literal
 366   Example: "mandoc -Tpdf afterboot.8 > output.pdf && pdfviewer output.pdf".
 367   Search the text "Routing tables".
 368   Also check what PostScript mode does when fixing this.
 369   reported by juanfra@ Wed, 04 Jun 2014 21:44:58 +0200
 370   instructions from juanfra@  Wed, 11 Jun 2014 02:21:01 +0200
 371     add a new <</Type /Font>> block to the PDF files with /BaseFont /Courier
 372     and change the /Name from /F0 to the new font (/F5 (?)).
 373   re-reported by tb@ Mon, 16 Mar 2015 16:47:21 +0100
 374   loc *  exist **  algo **  size *  imp **
 375
 376 --- HTML issues --------------------------------------------------------
 377
 378 - .Bf at the beginning of a paragraph inserts a bogus 1ex horizontal
 379   space, see for example random(3).  Introduced in
 380   http://mdocml.bsd.lv/cgi-bin/cvsweb/mdoc_html.c.diff?r1=1.91&r2=1.92
 381   reported by deraadt@ Mon, 28 Sep 2015 20:14:13 -0600 (MDT)
 382   loc **  exist **  algo **  size *  imp *
 383
 384 - jsg on icb, Nov 3, 2014:
 385   try to guess Xr in man(7) for hyperlinking
 386   and render them with <a class="Xr" href=...>
 387   https://github.com/Debian/debiman/issues/15
 388   loc *  exist *  algo **  size **  imp **
 389
 390 - The tables used to render the three-part page headers actually force
 391   the width of the <body> to the max-width given for <html>.
 392   Not yet sure how to fix that...
 393   Observed by an Anonymous Coward on undeadly.org:
 394   http://undeadly.org/cgi?action=article&sid=20140925064244&pid=1
 395   loc *  exist *  algo **  size *  imp ***
 396
 397 - generate <img> tags in HTML
 398   idea from florian@  Tue, 7 Apr 2015 00:26:28 +0000
 399   may be possible to implement with .Lk img://something.png alt_text
 400
 401 - check https://github.com/trentm/mdocml
 402
 403 ************************************************************************
 404 * formatting issues: gratuitous differences
 405 ************************************************************************
 406
 407 - .Fn reopens a new scope after punctuation in mandoc,
 408   but closes its scope for good in groff.
 409   Do we want to change mandoc or groff?
 410   Steffen Nurpmeso  Sat, 08 Nov 2014 13:34:59 +0100
 411   loc *  exist **  algo **  size *  imp **
 412
 413 - In .Bl -enum -width 0n, groff continues one the same line after
 414   the number, mandoc breaks the line.
 415   mail to kristaps@  Mon, 20 Jul 2009 02:21:39 +0200
 416   loc *  exist **  algo **  size *  imp **
 417
 418 - .Pp between two .It in .Bl -column should produce one,
 419   not two blank lines, see e.g. login.conf(5).
 420   reported by jmc@  Sun, 17 Apr 2011 14:04:58 +0059
 421   reported again by sthen@  Wed, 18 Jan 2012 02:09:39 +0000 (UTC)
 422   loc *  exist ***  algo **  size *  imp **
 423
 424 - If the *first* line after .It is .Pp, break the line right after
 425   the tag, do not pad with space characters before breaking.
 426   See the description of the a, c, and i commands in sed(1).
 427   loc *  exist **  algo **  size *  imp **
 428
 429 - If the first line after .It is .D1, do not assert a blank line
 430   in between, see for example tmux(1).
 431   reported by nicm@  13 Jan 2011 00:18:57 +0000
 432   loc *  exist **  algo **  size *  imp **
 433
 434 - Trailing punctuation after .It should trigger EOS spacing.
 435   reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
 436   Probably, this should be fixed somewhere in termp_it_pre(), not sure.
 437   loc *  exist **  algo **  size *  imp **
 438
 439 - In .Bl -tag, if a tag exceeds the right margin and must be continued
 440   on the next line, it must be indented by -width, not width+1;
 441   see "rule block|pass" in OpenBSD ifconfig(8).
 442   loc *  exist ***  algo **  size *  imp **
 443
 444 - When the -width string contains macros, the macros must be rendered
 445   before measuring the width, for example
 446     .Bl -tag -width ".Dv message"
 447   in magic(5), located in src/usr.bin/file, is the same
 448   as -width 7n, not -width 11n.
 449   The same applies to .Bl -column column widths;
 450   reported again by Nicolas Joly Thu, 1 Mar 2012 13:41:26 +0100 via wiz@ 5 Mar
 451   reported again by Franco Fichtner Fri, 27 Sep 2013 21:02:28 +0200
 452   reported again by Bruce Evans Fri, 17 Feb 2017 21:22:44 +0100 via bapt@
 453   loc ***  exist ***  algo ***  size **  imp ***
 454   An easy partial fix would be to just skip the first word if it starts
 455   with a dot, including any following white space, when measuring.
 456   loc *  exist *  algo *  size *  imp ***
 457
 458 - The \& zero-width character counts as output.
 459   That is, when it is alone on a line between two .Pp,
 460   we want three blank lines, not two as in mandoc.
 461   loc **  exist **  algo **  size *  imp **
 462
 463 - Sequences of multiple man(7) paragraphs (.PP, .IP) interspersed
 464   with .ps and .nf/.fi produce execessive blank lines, see libJudy
 465   and graphics/dcmtk.  The parser reorg may help with this.
 466
 467 - trailing whitespace must be ignored even when followed by a font escape,
 468   see for example
 469     makes
 470     \fBdig \fR
 471     operate in batch mode
 472   in dig(1).
 473   loc **  exist **  algo **  size *  imp **
 474
 475 ************************************************************************
 476 * warning issues
 477 ************************************************************************
 478
 479 - warn when .Sh or .Ss contain other macros
 480   Steffen Nurpmeso, savannah.gnu.org/bugs/index.php?45034
 481   loc *  exist *  algo *  size *  imp **
 482
 483 - warn about attempts to call non-callable macros
 484   Steffen Nurpmeso  Tue, 11 Nov 2014 22:55:16 +0100
 485   Note that formatting is inconsistent in groff.
 486   .Fn Po prints "Po()", .Ar Sh prints "file ..." and no "Sh".
 487   Relatively hard because the relevant code is scattered
 488   all over mdoc_macro.c and all subtly different.
 489   loc **  exist **  algo **  size **  imp **
 490
 491 - mandoc_special does not really check the escape sequence,
 492   but just the overall format
 493   loc **  exist **  algo ***  size **  imp **
 494
 495 - -Tlint parser errors and warnings to stdout
 496   to tech@mdocml, naddy@  Wed, 28 Sep 2011 11:21:46 +0200
 497   wait!  kristaps@  Sun, 02 Oct 2011 17:12:52 +0200
 498
 499 ************************************************************************
 500 * documentation issues
 501 ************************************************************************
 502
 503 - dashes, hyphens, and minus signs in manual pages
 504   jmc@ Fri, 28 Mar 2014 07:19:27 +0000
 505
 506 - mark macros as: page structure domain, manual domain, general text domain
 507   is this useful?
 508
 509 - mention /usr/share/misc/mdoc.template in mdoc(7)?
 510
 511 - Is all the content from http://www.std.com/obi/BSD/doc/usd/28.tbl/tbl
 512   covered in tbl(7)?
 513
 514 ************************************************************************
 515 * performance issues
 516 ************************************************************************
 517
 518 - Why are we using MAP_SHARED, not MAP_PRIVATE for mmap(2)?
 519   from kristaps@  Sat, 09 Aug 2014 13:51:36 +0200
 520
 521 Several areas can be cleaned up to make mandoc even faster.  These are
 522
 523 - the PDF file is HUGE: this can be reduced by using relative offsets
 524
 525 ************************************************************************
 526 * structural issues
 527 ************************************************************************
 528
 529 - POSIX says in the documentation of sysconf(3) that PATH_MAX
 530   is allowed to be so large that it is a bad idea to use it
 531   for sizing static buffers.  So use dynamic buffers throughout.
 532   See the file test-PATH_MAX.c for details.
 533   Found by Aaron M. Ucko in the GNU Hurd via Bdale Garbee,
 534   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=829624
 535
 536 - We use the input line number at several places to distinguish
 537   same-line from different-line input.  That plainly doesn't work
 538   with user-defined macros, leading to random breakage.
 539
 540 - Is it possible to further simplify ENDBODY_SPACE?
 541
 542 - Find better ways to prevent endless loops
 543   in roff(7) macro and string expansion.
 544
 545 - make buffers for parsing functions const
 546   christos@ via wiz@  Fri, 18 Dec 2015 17:10:01 +0100
 547
 548 - struct mparse refactoring
 549   Steffen Nurpmeso  Thu, 04 Sep 2014 12:50:00 +0200
 550
 551 ************************************************************************
 552 * CGI issues
 553 ************************************************************************
 554
 555  - Enable HTTP compression by detecting gzip encoding and filtering
 556    output through libz.
 557  - Sandbox (see OpenSSH).
 558  - Enable caching support via HTTP 304 and If-Modified-Since.
 559  - Have Mac OSX systems automatically disable -static compilation of the
 560    CGI: -static isn't supported.
 561
 562 ************************************************************************
 563 * to improve in the groff_mdoc(7) macros
 564 ************************************************************************
 565
 566 - use uname(1) to set doc-default-operating-system at install time
 567   tobimensch  Mon, 1 Dec 2014 00:25:07 +0100
 568
 569 - apostrophe (39), circumflex (94), grave (96), tilde (126)
 570   in manuals: \(aq, \(ha, \`, \(ti
 571   Re: [Groff] ASCII Minus Sign in man Pages.
 572   bentley@ 26 Apr 2017 10:02:06 -0600
 573   Do we need to fix existing manuals?
 574   Do we need to fix the definition of the mdoc(7) language?