TODO

   1 ************************************************************************
   2 * Official mandoc TODO.
   3 * $Id: TODO,v 1.194 2014/12/10 21:54:13 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 * crashes
  37 ************************************************************************
  38
  39 - The abort() in bufcat(), html.c, can be triggered via buffmt_includes()
  40   by running -Thtml -Oincludes on a file containing a long .In argument.
  41   Fixing this will probably require reworking the whole bufcat() concept.
  42   loc **  exist *  algo *  size **  imp **
  43
  44 ************************************************************************
  45 * missing features
  46 ************************************************************************
  47
  48 --- missing roff features ----------------------------------------------
  49
  50 - .ad (adjust margins)
  51   .ad l -- adjust left margin only (flush left)
  52   .ad r -- adjust right margin only (flush right)
  53   .ad c -- center text on line
  54   .ad b -- adjust both margins (alias: .ad n)
  55   .na   -- temporarily disable adjustment without changing the mode
  56   .ad   -- re-enable adjustment without changing the mode
  57   Adjustment mode is ignored while in no-fill mode (.nf).
  58   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
  59
  60 - .fc (field control)
  61   found by naddy@ in xloadimage(1)
  62   loc **  exist ***  algo *  size *  imp *
  63
  64 - .nr third argument (auto-increment step size, requires \n+)
  65   found by bentley@ in sbcl(1)  Mon, 9 Dec 2013 18:36:57 -0700
  66   loc *  exist *  algo *  size *  imp **
  67
  68 - .ns (no-space mode) occurs in xine-config(1)
  69   reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500
  70   loc ***  exist ***  algo ***  size **  imp *
  71
  72 - .ta (tab settings) occurs in ircbug(1) and probably gnats(1)
  73   reported by brad@  Sat, 15 Jan 2011 15:50:51 -0500
  74   also Tcl_NewStringObj(3) via wiz@  Wed, 5 Mar 2014 22:27:43 +0100
  75   also posix2time(3) Carsten Kunze  Mon, 1 Dec 2014 13:03:10 +0100
  76   loc **  exist ***  algo **  size **  imp ***
  77
  78 - .ti (temporary indent)
  79   found by naddy@ in xloadimage(1)
  80   found by bentley@ in nmh(1)  Mon, 23 Apr 2012 13:38:28 -0600
  81   loc **  exist **  algo **  size *  imp ** (parser reorg helps a lot)
  82
  83 - .while and .shift
  84   found by jca@ in ratpoison(1)  Sun, 30 Jun 2013 12:01:09 +0200
  85   loc *  exist **  algo **  size **  imp **
  86
  87 - \h horizontal move
  88   found in cclive(1) and nasm(1) asciidoc/DocBook output
  89   bentley@ on discuss@  Sat, 21 Sep 2013 22:29:34 -0600
  90   naddy@  Thu, 4 Dec 2014 16:26:41 +0100
  91   loc **  exist **  algo **  size *  imp ** (parser reorg helps a lot)
  92
  93 - \n+ and \n- numerical register increment and decrement
  94   found by bentley@ in sbcl(1)  Mon, 9 Dec 2013 18:36:57 -0700
  95   loc *  exist *  algo *  size *  imp **
  96
  97 - \w'' improve width measurements
  98   would not be very useful without an expression parser, see below
  99   needed for Tcl_NewStringObj(3) via wiz@  Wed, 5 Mar 2014 22:27:43 +0100
 100   loc **  exist ***  algo ***  size *  imp ***
 101
 102 - using undefined strings or macros defines them to be empty
 103   wl@  Mon, 14 Nov 2011 14:37:01 +0000
 104   loc *  exist *  algo *  size *  imp *
 105
 106 --- missing mdoc features ----------------------------------------------
 107
 108 - fix bad block nesting involving multiple identical explicit blocks
 109   see the OpenBSD mdoc_macro.c 1.47 commit message
 110   loc *  exist ***  algo ***  size *  imp **
 111
 112 - .Bl -column .Xo support is missing
 113   ultimate goal:
 114   restore .Xr and .Dv to
 115   lib/libc/compat-43/sigvec.3
 116   lib/libc/gen/signal.3
 117   lib/libc/sys/sigaction.2
 118   loc *  exist ***  algo ***  size *  imp **
 119
 120 - edge case: decide how to deal with blk_full bad nesting, e.g.
 121   .Sh .Nm .Bk .Nm .Ek .Sh found by jmc@ in ssh-keygen(1)
 122   from jmc@  Wed, 14 Jul 2010 18:10:32 +0100
 123   loc *  exist ***  algo ***  size **  imp **
 124
 125 - .Bd -centered implies -filled, not -unfilled, which is not
 126   easy to implement; it requires code similar to .ce, which
 127   we don't have either.
 128   Besides, groff has bug causing text right *before* .Bd -centered
 129   to be centered as well.
 130   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
 131
 132 - .Bd -filled should not be the same as .Bd -ragged, but align both
 133   the left and right margin.  In groff, it is implemented in terms
 134   of .ad b, which we don't have either.  Found in cksum(1).
 135   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
 136
 137 - implement blank `Bl -column', such as
 138   .Bl -column
 139   .It foo Ta bar
 140   .El
 141   loc *  exist ***  algo ***  size *  imp *
 142
 143 - explicitly disallow nested `Bl -column', which would clobber internal
 144   flags defined for struct mdoc_macro
 145   loc *  exist *  algo *  size *  imp **
 146
 147 - In .Bl -column .It, the end of the line probably has to be regarded
 148   as an implicit .Ta, if there could be one, see the following mildly
 149   ugly code from login.conf(5):
 150     .Bl -column minpasswordlen program xetcxmotd
 151     .It path Ta path Ta value of Dv _PATH_DEFPATH
 152     .br
 153     Default search path.
 154   reported by Michal Mazurek <akfaew at jasminek dot net>
 155   via jmc@ Thu, 7 Apr 2011 16:00:53 +0059
 156   loc *  exist ***  algo **  size *  imp **
 157
 158 - inside `.Bl -column' phrases, punctuation is handled like normal
 159   text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."
 160
 161 - inside `.Bl -column' phrases, TERMP_IGNDELIM handling by `Pf'
 162   is not safe, e.g. `.Bl -column .It Pf a b .' gives "ab."
 163   but should give "ab ."
 164
 165 - check whether it is correct that `D1' uses INDENT+1;
 166   does it need its own constant?
 167   loc *  exist **  algo **  size *  imp **
 168
 169 - prohibit `Nm' from having non-text HEAD children
 170   (e.g., NetBSD mDNSShared/dns-sd.1)
 171   (mdoc_html.c and mdoc_term.c `Nm' handlers can be slightly simplified)
 172
 173 - support translated section names
 174   e.g. x11/scrotwm scrotwm_es.1:21:2: error: NAME section must be first
 175   that one uses NOMBRE because it is spanish...
 176   deraadt tends to think that section-dependent macro behaviour
 177   is a bad idea in the first place, so this may be irrelevant
 178   loc **  exist **  algo **  size *  imp **
 179
 180 - When there is free text in the SYNOPSIS and that free text contains
 181   the .Nm macro, groff somehow understands to treat the .Nm as an in-line
 182   macro, while mandoc treats it as a block macro and breaks the line.
 183   No idea how the logic for distinguishing in-line and block instances
 184   should be, needs investigation.
 185   uqs@  Thu, 2 Jun 2011 11:03:51 +0200
 186   uqs@  Thu, 2 Jun 2011 11:33:35 +0200
 187   loc *  exist **  algo ***  size *  imp **
 188
 189 --- missing man features -----------------------------------------------
 190
 191 - -T[x]html doesn't stipulate non-collapsing spaces in literal mode
 192
 193 --- missing tbl features -----------------------------------------------
 194
 195 - look at the POSIX manuals in the books/man-pages-posix port,
 196   they use some unsupported tbl(7) features.
 197   loc *  exist **  algo **  size **  imp ***
 198
 199 - use Unicode U+2500 to U+256C for table borders
 200   in tbl(7) -Tutf-8 output
 201   suggested by bentley@  Tue, 14 Oct 2014 04:10:55 -0600
 202   loc *  exist **  algo *  size *  imp **
 203
 204 - allow standalone `.' to be interpreted as an end-of-layout
 205   delimiter instead of being thrown away as a no-op roff line
 206   reported by Yuri Pankov, Wed 18 May 2011 11:34:59 CEST
 207   loc **  exist **  algo **  size *  imp **
 208
 209 --- missing eqn features -----------------------------------------------
 210
 211 - The "size" keyword is parsed, but ignored by the formatter.
 212   loc *  exist *  algo *  size *  imp *
 213
 214 - The spacing characters `~', `^', and tab are currently ignored,
 215   see User's Guide (Second Edition) page 2 section 4.
 216   loc *  exist *  algo **  size *  imp **
 217
 218 - Mark and lineup are parsed and ignored,
 219   see User's Guide (Second Edition) page 5 section 15.
 220   loc **  exist **  algo **  size **  imp **
 221
 222 --- missing misc features ----------------------------------------------
 223
 224 - italic correction (\/) in PostScript mode
 225   Werner LEMBERG on groff at gnu dot org  Sun, 10 Nov 2013 12:47:46
 226   loc **  exist **  algo *  size *  imp *
 227
 228 - When makewhatis(8) encounters a FATAL parse error,
 229   it silently treats the file as formatted, which makes no sense
 230   at all for paths like man1/foo.1 - and which also contradicts
 231   what the manual says at the end of the description.
 232   The end result will be ENOENT for file names returned
 233   by mansearch() in manpage.file.
 234   loc *  exist *  algo *  size *  imp **
 235
 236 - makewhatis(8) for preformatted pages:
 237   parse the section number from the header line
 238   and compare to the section number from the directory name
 239   loc *  exist *  algo *  size *  imp **
 240
 241 - Does makewhatis(8) detect missing NAME sections, missing names,
 242   and missing descriptions in all the file formats?
 243   loc *  exist *  algo *  size *  imp ***
 244
 245 - clean up escape sequence handling, creating three classes:
 246   (1) fully implemented, or parsed and ignored without loss of content
 247   (2) unimplemented, potentially causing loss of content
 248       or serious mangling of formatting (e.g. \n) -> ERROR
 249       see textproc/mgdiff(1) for nice examples
 250   (3) undefined, just output the character -> perhaps WARNING
 251   loc ***  exist **  algo **  size **  imp *** (parser reorg helps)
 252
 253 - kettenis wants base roff, ms, and me  Fri, 1 Jan 2010 22:13:15 +0100 (CET)
 254   loc **  exist **  algo **  size ***  imp *
 255
 256 --- compatibility checks -----------------------------------------------
 257
 258 - is .Bk implemented correctly in modern groff?
 259   sobrado@  Tue, 19 Apr 2011 22:12:55 +0200
 260
 261 - compare output to Heirloom roff, Solaris roff, and
 262   http://repo.or.cz/w/neatroff.git  http://litcave.rudi.ir/
 263
 264 - look at AT&T DWB http://www2.research.att.com/sw/download
 265   Carsten Kunze <carsten dot kunze at arcor dot de> has patches
 266   Mon, 4 Aug 2014 17:01:28 +0200
 267
 268 - look at pages generated from reStructeredText, e.g. devel/mercurial hg(1)
 269   These are a weird mixture of man(7) and custom autogenerated low-level
 270   roff stuff.  Figure out to what extent we can cope.
 271   For details, see http://docutils.sourceforge.net/rst.html
 272   noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200
 273   reminded by nicm@  Mon, 3 May 2010 09:52:41 +0100
 274
 275 - look at pages generated from ronn(1) github.com/rtomayko/ronn
 276   (based on markdown)
 277
 278 - look at pages generated from Texinfo source by yat2m, e.g. security/gnupg
 279   First impression is not that bad.
 280
 281 - look at pages generated by pandoc; see
 282   https://github.com/jgm/pandoc/blob/master/src/Text/Pandoc/Writers/Man.hs
 283   porting planned by kili@  Thu, 19 Jun 2014 19:46:28 +0200
 284
 285 - check compatibility with Plan9:
 286   http://swtch.com/usr/local/plan9/tmac/tmac.an
 287   http://swtch.com/plan9port/man/man7/man.html
 288   "Anthony J. Bentley" <anthonyjbentley@gmail.com> 28 Dec 2010 21:58:40 -0700
 289
 290 - check compatibility with the man(7) formatter
 291   https://raw.githubusercontent.com/rofl0r/hardcore-utils/master/man.c
 292
 293 - check compatibility with
 294   http://ikiwiki.info/plugins/contrib/mandoc/
 295   https://github.com/schmonz/ikiwiki/compare/mandoc
 296   Amitai Schlair  Mon, 19 May 2014 14:05:53 -0400
 297
 298 ************************************************************************
 299 * formatting issues: ugly output
 300 ************************************************************************
 301
 302 - a column list with blank `Ta' cells triggers a spurrious
 303   start-with-whitespace printing of a newline
 304
 305 - In .Bl -column,
 306   .It Em Authentication<tab>Key Length
 307   ought to render "Key Length" with emphasis, too,
 308   see OpenBSD iked.conf(5).
 309   reported again Nicolas Joly via wiz@ Wed, 12 Oct 2011 00:20:00 +0200
 310   loc *  exist ***  algo ***  size **  imp ***
 311
 312 - empty phrases in .Bl column produce too few blanks
 313   try e.g. .Bl -column It Ta Ta
 314   reported by millert Fri, 02 Apr 2010 16:13:46 -0400
 315   loc *  exist ***  algo ***  size *  imp **
 316
 317 - .%T can have trailing punctuation.  Currently, it puts the trailing
 318   punctuation into a trailing MDOC_TEXT element inside its own scope.
 319   That element should rather be outside its scope, such that the
 320   punctuation does not get underlines.  This is not trivial to
 321   implement because .%T then needs some features of in_line_eoln() -
 322   slurp all arguments into one single text element - and one feature
 323   of in_line() - put trailing punctuation out of scope.
 324   Found in mount_nfs(8) and exports(5), search for "Appendix".
 325   loc **  exist **  algo ***  size *  imp **
 326
 327 - Trailing punctuation after .%T triggers EOS spacing, at least
 328   outside .Rs (eek!).  Simply setting ARGSFL_DELIM for .%T is not
 329   the right solution, it sends mandoc into an endless loop.
 330   reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
 331   loc *  exist **  algo **  size *  imp **
 332
 333 - global variables in the SYNOPSIS of section 3 pages
 334   .Vt vs .Vt/.Va vs .Ft/.Va vs .Ft/.Fa ...
 335   from kristaps@  Tue, 08 Jun 2010 11:13:32 +0200
 336
 337 - in enclosures, mandoc sometimes fancies a bogus end of sentence
 338   reminded by jmc@  Thu, 23 Sep 2010 18:13:39 +0059
 339   loc *  exist **  algo ***  size *  imp ***
 340
 341 - formatting /usr/local/man/man1/latex2man.1 with groff and mandoc
 342   reveals lots of bugs both in groff and mandoc...
 343   reported by bentley@  Wed, 22 May 2013 23:49:30 -0600
 344
 345 --- PDF issues ---------------------------------------------------------
 346
 347 - PDF output doesn't use a monospaced font for .Bd -literal
 348   Example: "mandoc -Tpdf afterboot.8 > output.pdf && pdfviewer output.pdf".
 349   Search the text "Routing tables".
 350   Also check what PostScript mode does when fixing this.
 351   reported by juanfra@ Wed, 04 Jun 2014 21:44:58 +0200
 352   instructions from juanfra@  Wed, 11 Jun 2014 02:21:01 +0200
 353     add a new <</Type /Font>> block to the PDF files with /BaseFont /Courier
 354     and change the /Name from /F0 to the new font (/F5 (?)).
 355   loc *  exist **  algo **  size *  imp **
 356
 357 --- HTML issues --------------------------------------------------------
 358
 359 - <dl><dt><dd> formatting is ugly
 360   hints are easy to find on the web, e.g.
 361   http://stackoverflow.com/questions/1713048/
 362   see also matthew@  Fri, 18 Jul 2014 19:25:12 -0700
 363   loc *  exist *  algo **  size *  imp ***
 364
 365 - jsg on icb, Nov 3, 2014:
 366   try to guess Xr in man(7) for hyperlinking
 367
 368 - The tables used to render the three-part page headers actually force
 369   the width of the <body> to the max-width given for <html>.
 370   Not yet sure how to fix that...
 371   Observed by an Anonymous Coward on undeadly.org:
 372   http://undeadly.org/cgi?action=article&sid=20140925064244&pid=1
 373   loc *  exist *  algo **  size *  imp ***
 374
 375 - consider whether <var> can be used for Ar Dv Er Ev Fa Va.
 376   from bentley@  Wed, 13 Aug 2014 09:17:55 -0600
 377
 378 - check https://github.com/trentm/mdocml
 379
 380 ************************************************************************
 381 * formatting issues: gratuitous differences
 382 ************************************************************************
 383
 384 - .Fn reopens a new scope after punctuation in mandoc,
 385   but closes its scope for good in groff.
 386   Do we want to change mandoc or groff?
 387   Steffen Nurpmeso  Sat, 08 Nov 2014 13:34:59 +0100
 388   loc *  exist **  algo **  size *  imp **
 389
 390 - In .Bl -enum -width 0n, groff continues one the same line after
 391   the number, mandoc breaks the line.
 392   mail to kristaps@  Mon, 20 Jul 2009 02:21:39 +0200
 393   loc *  exist **  algo **  size *  imp **
 394
 395 - .Pp between two .It in .Bl -column should produce one,
 396   not two blank lines, see e.g. login.conf(5).
 397   reported by jmc@  Sun, 17 Apr 2011 14:04:58 +0059
 398   reported again by sthen@  Wed, 18 Jan 2012 02:09:39 +0000 (UTC)
 399   loc *  exist ***  algo **  size *  imp **
 400
 401 - If the *first* line after .It is .Pp, break the line right after
 402   the tag, do not pad with space characters before breaking.
 403   See the description of the a, c, and i commands in sed(1).
 404   loc *  exist **  algo **  size *  imp **
 405
 406 - If the first line after .It is .D1, do not assert a blank line
 407   in between, see for example tmux(1).
 408   reported by nicm@  13 Jan 2011 00:18:57 +0000
 409   loc *  exist **  algo **  size *  imp **
 410
 411 - Trailing punctuation after .It should trigger EOS spacing.
 412   reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
 413   Probably, this should be fixed somewhere in termp_it_pre(), not sure.
 414   loc *  exist **  algo **  size *  imp **
 415
 416 - .Nx 1.0a
 417   should be "NetBSD 1.0A", not "NetBSD 1.0a",
 418   see OpenBSD ccdconfig(8).
 419   loc *  exist *  algo *  size *  imp **
 420
 421 - In .Bl -tag, if a tag exceeds the right margin and must be continued
 422   on the next line, it must be indented by -width, not width+1;
 423   see "rule block|pass" in OpenBSD ifconfig(8).
 424   loc *  exist ***  algo **  size *  imp **
 425
 426 - When the -width string contains macros, the macros must be rendered
 427   before measuring the width, for example
 428     .Bl -tag -width ".Dv message"
 429   in magic(5), located in src/usr.bin/file, is the same
 430   as -width 7n, not -width 11n.
 431   The same applies to .Bl -column column widths;
 432   reported again by Nicolas Joly Thu, 1 Mar 2012 13:41:26 +0100 via wiz@ 5 Mar
 433   reported again by Franco Fichtner Fri, 27 Sep 2013 21:02:28 +0200
 434   loc ***  exist ***  algo ***  size **  imp ***
 435   An easy partial fix would be to just skip the first word if it starts
 436   with a dot, including any following white space, when measuring.
 437   loc *  exist *  algo *  size *  imp ***
 438
 439 - The \& zero-width character counts as output.
 440   That is, when it is alone on a line between two .Pp,
 441   we want three blank lines, not two as in mandoc.
 442   loc **  exist **  algo **  size *  imp **
 443
 444 - Header lines of excessive length:
 445   Port OpenBSD man_term.c rev. 1.25 to mdoc_term.c
 446   and document it in mdoc(7) and man(7) COMPATIBILITY
 447   found while talking to Chris Bennett
 448   loc *  exist *  algo *  size *  imp *
 449
 450 - trailing whitespace must be ignored even when followed by a font escape,
 451   see for example
 452     makes
 453     \fBdig \fR
 454     operate in batch mode
 455   in dig(1).
 456   loc **  exist **  algo **  size *  imp **
 457
 458 ************************************************************************
 459 * warning issues
 460 ************************************************************************
 461
 462 - check that MANDOCERR_BADTAB is thrown in the right cases,
 463   i.e. when finding a literal tab character in fill mode,
 464   and possibly change the wording of the warning message
 465   to refer to fill mode, not literal mode
 466   See the mail from Werner LEMBERG on the groff list,
 467   Fri, 14 Feb 2014 18:54:42 +0100 (CET)
 468   loc *  exist **  algo **  size *  imp **
 469
 470 - warn about attempts to call non-callable macros
 471   Steffen Nurpmeso  Tue, 11 Nov 2014 22:55:16 +0100
 472   Note that formatting is inconsistent in groff.
 473   .Fn Po prints "Po()", .Ar Sh prints "file ..." and no "Sh".
 474   Relatively hard because the relevant code is scattered
 475   all over mdoc_macro.c and all subtly different.
 476   loc **  exist **  algo **  size **  imp **
 477
 478 - warn about "new sentence, new line"
 479   loc **  exist **  algo ***  size *  imp **
 480
 481 - mandoc_special does not really check the escape sequence,
 482   but just the overall format
 483   loc **  exist **  algo ***  size **  imp **
 484
 485 - integrate mdoclint into mandoc ("end-of-line whitespace" thread)
 486   from jmc@  Mon, 13 Jul 2009 17:12:09 +0100
 487   from kristaps@  Mon, 13 Jul 2009 18:34:53 +0200
 488   from jmc@  Mon, 13 Jul 2009 17:45:37 +0059
 489   from kristaps@  Mon, 13 Jul 2009 19:02:03 +0200
 490   (mostly done, check what remains)
 491
 492 - -Tlint parser errors and warnings to stdout
 493   to tech@mdocml, naddy@  Wed, 28 Sep 2011 11:21:46 +0200
 494   wait!  kristaps@  Sun, 02 Oct 2011 17:12:52 +0200
 495
 496 - for system errors, use errno/strerror/warn/err
 497
 498 ************************************************************************
 499 * documentation issues
 500 ************************************************************************
 501
 502 - mention hyphenation rules:
 503   breaking at letter-letter in text mode (not macro args)
 504   proper hyphenation is unimplemented
 505
 506 - talk about spacing around delimiters
 507   to jmc@, kristaps@  Sat, 23 Apr 2011 17:41:27 +0200
 508
 509 - mark macros as: page structure domain, manual domain, general text domain
 510   is this useful?
 511
 512 - mention /usr/share/misc/mdoc.template in mdoc(7)?
 513
 514 - Is all the content from http://www.std.com/obi/BSD/doc/usd/28.tbl/tbl
 515   covered in tbl(7)?
 516
 517 ************************************************************************
 518 * performance issues
 519 ************************************************************************
 520
 521 - Why are we using MAP_SHARED, not MAP_PRIVATE for mmap(2)?
 522   How does SQLITE_CONFIG_PAGECACHE actually work?  Document it!
 523   from kristaps@  Sat, 09 Aug 2014 13:51:36 +0200
 524
 525 Several areas can be cleaned up to make mandoc even faster.  These are
 526
 527 - improve hashing mechanism for macros (quite important: performance)
 528
 529 - improve hashing mechanism for characters (not as important)
 530
 531 - the PDF file is HUGE: this can be reduced by using relative offsets
 532
 533 - instead of re-initialising the roff predefined-strings set before each
 534   parse, create a read-only version the first time and copy it
 535   loc *  exist **  algo **  size *  imp **
 536
 537 ************************************************************************
 538 * structural issues
 539 ************************************************************************
 540
 541 - Use libz directly instead of forking gunzip(1).
 542   Suggested by bapt at FreeBSD among others.
 543
 544 - We use the input line number at several places to distinguish
 545   same-line from different-line input.  That plainly doesn't work
 546   with user-defined macros, leading to random breakage.
 547
 548 - Find better ways to prevent endless loops
 549   in roff(7) macro and string expansion.
 550
 551 - Finish cleanup of date handling.
 552   Decide which formats should be recognized where.
 553   Update both mdoc(7) and man(7) documentation.
 554   Triggered by  Tim van der Molen  Tue, 22 Feb 2011 20:30:45 +0100
 555
 556 - struct mparse refactoring
 557   Steffen Nurpmeso  Thu, 04 Sep 2014 12:50:00 +0200
 558
 559 - Consider creating some views that will make the database more
 560   readable from the sqlite3 shell.  Consider using them to
 561   abstract from the database structure, too.
 562   suggested by espie@  Sat, 19 Apr 2014 14:52:57 +0200
 563
 564 ************************************************************************
 565 * CGI issues
 566 ************************************************************************
 567
 568  - Enable HTTP compression by detecting gzip encoding and filtering
 569    output through libz.
 570  - Sandbox (see OpenSSH).
 571  - Enable caching support via HTTP 304 and If-Modified-Since.
 572  - Allow for cgi.h to be overridden by CGI environment variables.
 573    Otherwise, binary distributions will inherit the compile-time
 574    behaviour, which is not optimal.
 575  - Have Mac OSX systems automatically disable -static compilation of the
 576    CGI: -static isn't supported.
 577
 578 ************************************************************************
 579 * to improve in the groff_mdoc(7) macros
 580 ************************************************************************
 581
 582 - use uname(1) to set doc-default-operating-system at install time
 583   tobimensch  Mon, 1 Dec 2014 00:25:07 +0100