TODO

   1 ************************************************************************
   2 * Official mandoc TODO.
   3 * $Id: TODO,v 1.185 2014/10/16 01:11:20 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   loc **  exist ***  algo **  size **  imp **
  76
  77 - .ti (temporary indent)
  78   found by naddy@ in xloadimage(1)
  79   found by bentley@ in nmh(1)  Mon, 23 Apr 2012 13:38:28 -0600
  80   loc **  exist **  algo **  size *  imp ** (parser reorg helps a lot)
  81
  82 - .while and .shift
  83   found by jca@ in ratpoison(1)  Sun, 30 Jun 2013 12:01:09 +0200
  84   loc *  exist **  algo **  size **  imp **
  85
  86 - \c (interrupted text) should prevent the line break
  87   even inside .Bd literal; that occurs in chat(8)
  88   also found in cclive(1) - DocBook output
  89   loc **  exist ***  algo **  size *  imp *
  90
  91 - \h horizontal move
  92   found in cclive(1) DocBook output
  93   Anthony J. Bentley on discuss@  Sat, 21 Sep 2013 22:29:34 -0600
  94   loc **  exist **  algo **  size *  imp ** (parser reorg helps a lot)
  95
  96 - \n+ and \n- numerical register increment and decrement
  97   found by bentley@ in sbcl(1)  Mon, 9 Dec 2013 18:36:57 -0700
  98   loc *  exist *  algo *  size *  imp **
  99
 100 - \w'' improve width measurements
 101   would not be very useful without an expression parser, see below
 102   needed for Tcl_NewStringObj(3) via wiz@  Wed, 5 Mar 2014 22:27:43 +0100
 103   loc **  exist ***  algo ***  size *  imp ***
 104
 105 - using undefined strings or macros defines them to be empty
 106   wl@  Mon, 14 Nov 2011 14:37:01 +0000
 107   loc *  exist *  algo *  size *  imp *
 108
 109 --- missing mdoc features ----------------------------------------------
 110
 111 - fix bad block nesting involving multiple identical explicit blocks
 112   see the OpenBSD mdoc_macro.c 1.47 commit message
 113   loc *  exist ***  algo ***  size *  imp **
 114
 115 - .Bl -column .Xo support is missing
 116   ultimate goal:
 117   restore .Xr and .Dv to
 118   lib/libc/compat-43/sigvec.3
 119   lib/libc/gen/signal.3
 120   lib/libc/sys/sigaction.2
 121   loc *  exist ***  algo ***  size *  imp **
 122
 123 - edge case: decide how to deal with blk_full bad nesting, e.g.
 124   .Sh .Nm .Bk .Nm .Ek .Sh found by jmc@ in ssh-keygen(1)
 125   from jmc@  Wed, 14 Jul 2010 18:10:32 +0100
 126   loc *  exist ***  algo ***  size **  imp **
 127
 128 - \\ is now implemented correctly
 129   * when defining strings and macros using .ds and .de
 130   * when parsing roff(7) and man(7) macro arguments
 131   It does not yet work in mdoc(7) macro arguments
 132   because libmdoc does not yet use mandoc_getarg().
 133   Also check what happens in plain text, it must be identical to \e.
 134
 135 - .Bd -centered implies -filled, not -unfilled, which is not
 136   easy to implement; it requires code similar to .ce, which
 137   we don't have either.
 138   Besides, groff has bug causing text right *before* .Bd -centered
 139   to be centered as well.
 140   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
 141
 142 - .Bd -filled should not be the same as .Bd -ragged, but align both
 143   the left and right margin.  In groff, it is implemented in terms
 144   of .ad b, which we don't have either.  Found in cksum(1).
 145   loc ***  exist ***  algo **  size **  imp **  (parser reorg would help)
 146
 147 - implement blank `Bl -column', such as
 148   .Bl -column
 149   .It foo Ta bar
 150   .El
 151   loc *  exist ***  algo ***  size *  imp *
 152
 153 - explicitly disallow nested `Bl -column', which would clobber internal
 154   flags defined for struct mdoc_macro
 155   loc *  exist *  algo *  size *  imp **
 156
 157 - In .Bl -column .It, the end of the line probably has to be regarded
 158   as an implicit .Ta, if there could be one, see the following mildly
 159   ugly code from login.conf(5):
 160     .Bl -column minpasswordlen program xetcxmotd
 161     .It path Ta path Ta value of Dv _PATH_DEFPATH
 162     .br
 163     Default search path.
 164   reported by Michal Mazurek <akfaew at jasminek dot net>
 165   via jmc@ Thu, 7 Apr 2011 16:00:53 +0059
 166   loc *  exist ***  algo **  size *  imp **
 167
 168 - inside `.Bl -column' phrases, punctuation is handled like normal
 169   text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."
 170
 171 - inside `.Bl -column' phrases, TERMP_IGNDELIM handling by `Pf'
 172   is not safe, e.g. `.Bl -column .It Pf a b .' gives "ab."
 173   but should give "ab ."
 174
 175 - set a meaningful default if no `Bl' list type is assigned
 176   loc *  exist *  algo *  size *  imp **  (already done?)
 177
 178 - have a blank `It' head for `Bl -tag' not puke
 179   loc *  exist *  algo *  size *  imp **  (already done?)
 180
 181 - check whether it is correct that `D1' uses INDENT+1;
 182   does it need its own constant?
 183   loc *  exist **  algo **  size *  imp **
 184
 185 - prohibit `Nm' from having non-text HEAD children
 186   (e.g., NetBSD mDNSShared/dns-sd.1)
 187   (mdoc_html.c and mdoc_term.c `Nm' handlers can be slightly simplified)
 188
 189 - support translated section names
 190   e.g. x11/scrotwm scrotwm_es.1:21:2: error: NAME section must be first
 191   that one uses NOMBRE because it is spanish...
 192   deraadt tends to think that section-dependent macro behaviour
 193   is a bad idea in the first place, so this may be irrelevant
 194   loc **  exist **  algo **  size *  imp **
 195
 196 - When there is free text in the SYNOPSIS and that free text contains
 197   the .Nm macro, groff somehow understands to treat the .Nm as an in-line
 198   macro, while mandoc treats it as a block macro and breaks the line.
 199   No idea how the logic for distinguishing in-line and block instances
 200   should be, needs investigation.
 201   uqs@  Thu, 2 Jun 2011 11:03:51 +0200
 202   uqs@  Thu, 2 Jun 2011 11:33:35 +0200
 203   loc *  exist **  algo ***  size *  imp **
 204
 205 --- missing man features -----------------------------------------------
 206
 207 - -T[x]html doesn't stipulate non-collapsing spaces in literal mode
 208
 209 --- missing tbl features -----------------------------------------------
 210
 211 - look at the POSIX manuals in the books/man-pages-posix port,
 212   they use some unsupported tbl(7) features.
 213   loc *  exist **  algo **  size **  imp ***
 214
 215 - use Unicode U+2500 to U+256C for table borders
 216   in tbl(7) -Tutf-8 output
 217   suggested by bentley@  Tue, 14 Oct 2014 04:10:55 -0600
 218   loc *  exist **  algo *  size *  imp **
 219
 220 - allow standalone `.' to be interpreted as an end-of-layout
 221   delimiter instead of being thrown away as a no-op roff line
 222   reported by Yuri Pankov, Wed 18 May 2011 11:34:59 CEST
 223   loc **  exist **  algo **  size *  imp **
 224
 225 --- missing eqn features -----------------------------------------------
 226
 227 - The "size" keyword is parsed, but ignored by the formatter.
 228   loc *  exist *  algo *  size *  imp *
 229
 230 - The spacing characters `~', `^', and tab are currently ignored,
 231   see User's Guide (Second Edition) page 2 section 4.
 232   loc *  exist *  algo **  size *  imp **
 233
 234 - Mark and lineup are parsed and ignored,
 235   see User's Guide (Second Edition) page 5 section 15.
 236   loc **  exist **  algo **  size **  imp **
 237
 238 --- missing misc features ----------------------------------------------
 239
 240 - italic correction (\/) in PostScript mode
 241   Werner LEMBERG on groff at gnu dot org  Sun, 10 Nov 2013 12:47:46
 242   loc **  exist **  algo *  size *  imp *
 243
 244 - When makewhatis(8) encounters a FATAL parse error,
 245   it silently treats the file as formatted, which makes no sense
 246   at all for paths like man1/foo.1 - and which also contradicts
 247   what the manual says at the end of the description.
 248   The end result will be ENOENT for file names returned
 249   by mansearch() in manpage.file.
 250   loc *  exist *  algo *  size *  imp **
 251
 252 - makewhatis(8) for preformatted pages:
 253   parse the section number from the header line
 254   and compare to the section number from the directory name
 255   loc *  exist *  algo *  size *  imp **
 256
 257 - Does makewhatis(8) detect missing NAME sections, missing names,
 258   and missing descriptions in all the file formats?
 259   loc *  exist *  algo *  size *  imp ***
 260
 261 - clean up escape sequence handling, creating three classes:
 262   (1) fully implemented, or parsed and ignored without loss of content
 263   (2) unimplemented, potentially causing loss of content
 264       or serious mangling of formatting (e.g. \n) -> ERROR
 265       see textproc/mgdiff(1) for nice examples
 266   (3) undefined, just output the character -> perhaps WARNING
 267   loc ***  exist **  algo **  size **  imp *** (parser reorg helps)
 268
 269 - kettenis wants base roff, ms, and me  Fri, 1 Jan 2010 22:13:15 +0100 (CET)
 270   loc **  exist **  algo **  size ***  imp *
 271
 272 --- compatibility checks -----------------------------------------------
 273
 274 - is .Bk implemented correctly in modern groff?
 275   sobrado@  Tue, 19 Apr 2011 22:12:55 +0200
 276
 277 - compare output to Heirloom roff, Solaris roff, and
 278   http://repo.or.cz/w/neatroff.git  http://litcave.rudi.ir/
 279
 280 - look at AT&T DWB http://www2.research.att.com/sw/download
 281   Carsten Kunze <carsten dot kunze at arcor dot de> has patches
 282   Mon, 4 Aug 2014 17:01:28 +0200
 283
 284 - look at pages generated from reStructeredText, e.g. devel/mercurial hg(1)
 285   These are a weird mixture of man(7) and custom autogenerated low-level
 286   roff stuff.  Figure out to what extent we can cope.
 287   For details, see http://docutils.sourceforge.net/rst.html
 288   noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200
 289   reminded by nicm@  Mon, 3 May 2010 09:52:41 +0100
 290
 291 - look at pages generated from ronn(1) github.com/rtomayko/ronn
 292   (based on markdown)
 293
 294 - look at pages generated from Texinfo source by yat2m, e.g. security/gnupg
 295   First impression is not that bad.
 296
 297 - look at pages generated by pandoc; see
 298   https://github.com/jgm/pandoc/blob/master/src/Text/Pandoc/Writers/Man.hs
 299   porting planned by kili@  Thu, 19 Jun 2014 19:46:28 +0200
 300
 301 - check compatibility with Plan9:
 302   http://swtch.com/usr/local/plan9/tmac/tmac.an
 303   http://swtch.com/plan9port/man/man7/man.html
 304   "Anthony J. Bentley" <anthonyjbentley@gmail.com> 28 Dec 2010 21:58:40 -0700
 305
 306 - check compatibility with the man(7) formatter
 307   https://raw.githubusercontent.com/rofl0r/hardcore-utils/master/man.c
 308
 309 ************************************************************************
 310 * formatting issues: ugly output
 311 ************************************************************************
 312
 313 - a column list with blank `Ta' cells triggers a spurrious
 314   start-with-whitespace printing of a newline
 315
 316 - In .Bl -column,
 317   .It Em Authentication<tab>Key Length
 318   ought to render "Key Length" with emphasis, too,
 319   see OpenBSD iked.conf(5).
 320   reported again Nicolas Joly via wiz@ Wed, 12 Oct 2011 00:20:00 +0200
 321   loc *  exist ***  algo ***  size **  imp ***
 322
 323 - empty phrases in .Bl column produce too few blanks
 324   try e.g. .Bl -column It Ta Ta
 325   reported by millert Fri, 02 Apr 2010 16:13:46 -0400
 326   loc *  exist ***  algo ***  size *  imp **
 327
 328 - .%T can have trailing punctuation.  Currently, it puts the trailing
 329   punctuation into a trailing MDOC_TEXT element inside its own scope.
 330   That element should rather be outside its scope, such that the
 331   punctuation does not get underlines.  This is not trivial to
 332   implement because .%T then needs some features of in_line_eoln() -
 333   slurp all arguments into one single text element - and one feature
 334   of in_line() - put trailing punctuation out of scope.
 335   Found in mount_nfs(8) and exports(5), search for "Appendix".
 336   loc **  exist **  algo ***  size *  imp **
 337
 338 - Trailing punctuation after .%T triggers EOS spacing, at least
 339   outside .Rs (eek!).  Simply setting ARGSFL_DELIM for .%T is not
 340   the right solution, it sends mandoc into an endless loop.
 341   reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
 342   loc *  exist **  algo **  size *  imp **
 343
 344 - global variables in the SYNOPSIS of section 3 pages
 345   .Vt vs .Vt/.Va vs .Ft/.Va vs .Ft/.Fa ...
 346   from kristaps@  Tue, 08 Jun 2010 11:13:32 +0200
 347
 348 - in enclosures, mandoc sometimes fancies a bogus end of sentence
 349   reminded by jmc@  Thu, 23 Sep 2010 18:13:39 +0059
 350   loc *  exist **  algo ***  size *  imp ***
 351
 352 - formatting /usr/local/man/man1/latex2man.1 with groff and mandoc
 353   reveals lots of bugs both in groff and mandoc...
 354   reported by bentley@  Wed, 22 May 2013 23:49:30 -0600
 355
 356 --- PDF issues ---------------------------------------------------------
 357
 358 - PDF output doesn't use a monospaced font for .Bd -literal
 359   Example: "mandoc -Tpdf afterboot.8 > output.pdf && pdfviewer output.pdf".
 360   Search the text "Routing tables".
 361   Also check what PostScript mode does when fixing this.
 362   reported by juanfra@ Wed, 04 Jun 2014 21:44:58 +0200
 363   loc *  exist **  algo ?  size *  imp **
 364
 365 --- HTML issues --------------------------------------------------------
 366
 367 - <dl><dt><dd> formatting is ugly
 368   hints are easy to find on the web, e.g.
 369   http://stackoverflow.com/questions/1713048/
 370   see also matthew@  Fri, 18 Jul 2014 19:25:12 -0700
 371   loc *  exist *  algo **  size *  imp ***
 372
 373 - The tables used to render the three-part page headers actually force
 374   the width of the <body> to the max-width given for <html>.
 375   Not yet sure how to fix that...
 376   Observed by an Anonymous Coward on undeadly.org:
 377   http://undeadly.org/cgi?action=article&sid=20140925064244&pid=1
 378   loc *  exist *  algo **  size *  imp ***
 379
 380 - consider whether <var> can be used for Ar Dv Er Ev Fa Va.
 381   from bentley@  Wed, 13 Aug 2014 09:17:55 -0600
 382
 383 - check https://github.com/trentm/mdocml
 384
 385 ************************************************************************
 386 * formatting issues: gratuitous differences
 387 ************************************************************************
 388
 389 - .Rv (and probably .Ex) print different text if an `Nm' has been named
 390   or not (run a manual without `Nm blah' to see this).  I'm not sure
 391   that this exists in the wild, but it's still an error.
 392   loc *  exist *  algo *  size *  imp * (already done?)
 393
 394 - In .Bl -bullet, the groff bullet is "+\b+\bo\bo", the mandoc bullet
 395   is just "o\bo".  The problem is to not break ps/pdf when fixing.
 396   see for example OpenBSD ksh(1)
 397   loc **  exist **  algo **  size *  imp **
 398
 399 - In .Bl -enum -width 0n, groff continues one the same line after
 400   the number, mandoc breaks the line.
 401   mail to kristaps@  Mon, 20 Jul 2009 02:21:39 +0200
 402   loc *  exist **  algo **  size *  imp **
 403
 404 - .Pp between two .It in .Bl -column should produce one,
 405   not two blank lines, see e.g. login.conf(5).
 406   reported by jmc@  Sun, 17 Apr 2011 14:04:58 +0059
 407   reported again by sthen@  Wed, 18 Jan 2012 02:09:39 +0000 (UTC)
 408   loc *  exist ***  algo **  size *  imp **
 409
 410 - If the *first* line after .It is .Pp, break the line right after
 411   the tag, do not pad with space characters before breaking.
 412   See the description of the a, c, and i commands in sed(1).
 413   loc *  exist **  algo **  size *  imp **
 414
 415 - If the first line after .It is .D1, do not assert a blank line
 416   in between, see for example tmux(1).
 417   reported by nicm@  13 Jan 2011 00:18:57 +0000
 418   loc *  exist **  algo **  size *  imp **
 419
 420 - Trailing punctuation after .It should trigger EOS spacing.
 421   reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
 422   Probably, this should be fixed somewhere in termp_it_pre(), not sure.
 423   loc *  exist **  algo **  size *  imp **
 424
 425 - .Nx 1.0a
 426   should be "NetBSD 1.0A", not "NetBSD 1.0a",
 427   see OpenBSD ccdconfig(8).
 428   loc *  exist *  algo *  size *  imp **
 429
 430 - In .Bl -tag, if a tag exceeds the right margin and must be continued
 431   on the next line, it must be indented by -width, not width+1;
 432   see "rule block|pass" in OpenBSD ifconfig(8).
 433   loc *  exist ***  algo **  size *  imp **
 434
 435 - When the -width string contains macros, the macros must be rendered
 436   before measuring the width, for example
 437     .Bl -tag -width ".Dv message"
 438   in magic(5), located in src/usr.bin/file, is the same
 439   as -width 7n, not -width 11n.
 440   The same applies to .Bl -column column widths;
 441   reported again by Nicolas Joly Thu, 1 Mar 2012 13:41:26 +0100 via wiz@ 5 Mar
 442   reported again by Franco Fichtner Fri, 27 Sep 2013 21:02:28 +0200
 443   loc ***  exist ***  algo ***  size **  imp ***
 444   An easy partial fix would be to just skip the first word if it starts
 445   with a dot, including any following white space, when measuring.
 446   loc *  exist *  algo *  size *  imp ***
 447
 448 - The \& zero-width character counts as output.
 449   That is, when it is alone on a line between two .Pp,
 450   we want three blank lines, not two as in mandoc.
 451   loc **  exist **  algo **  size *  imp **
 452
 453 - Header lines of excessive length:
 454   Port OpenBSD man_term.c rev. 1.25 to mdoc_term.c
 455   and document it in mdoc(7) and man(7) COMPATIBILITY
 456   found while talking to Chris Bennett
 457   loc *  exist *  algo *  size *  imp *
 458
 459 - trailing whitespace must be ignored even when followed by a font escape,
 460   see for example
 461     makes
 462     \fBdig \fR
 463     operate in batch mode
 464   in dig(1).
 465   loc **  exist **  algo **  size *  imp **
 466
 467 ************************************************************************
 468 * warning issues
 469 ************************************************************************
 470
 471 - check that MANDOCERR_BADTAB is thrown in the right cases,
 472   i.e. when finding a literal tab character in fill mode,
 473   and possibly change the wording of the warning message
 474   to refer to fill mode, not literal mode
 475   See the mail from Werner LEMBERG on the groff list,
 476   Fri, 14 Feb 2014 18:54:42 +0100 (CET)
 477   loc *  exist **  algo **  size *  imp **
 478
 479 - warn about "new sentence, new line"
 480   loc **  exist **  algo ***  size *  imp **
 481
 482 - mandoc_special does not really check the escape sequence,
 483   but just the overall format
 484   loc **  exist **  algo ***  size **  imp **
 485
 486 - integrate mdoclint into mandoc ("end-of-line whitespace" thread)
 487   from jmc@  Mon, 13 Jul 2009 17:12:09 +0100
 488   from kristaps@  Mon, 13 Jul 2009 18:34:53 +0200
 489   from jmc@  Mon, 13 Jul 2009 17:45:37 +0059
 490   from kristaps@  Mon, 13 Jul 2009 19:02:03 +0200
 491   (mostly done, check what remains)
 492
 493 - -Tlint parser errors and warnings to stdout
 494   to tech@mdocml, naddy@  Wed, 28 Sep 2011 11:21:46 +0200
 495   wait!  kristaps@  Sun, 02 Oct 2011 17:12:52 +0200
 496
 497 - for system errors, use errno/strerror/warn/err
 498
 499 ************************************************************************
 500 * documentation issues
 501 ************************************************************************
 502
 503 - mention hyphenation rules:
 504   breaking at letter-letter in text mode (not macro args)
 505   proper hyphenation is unimplemented
 506
 507 - talk about spacing around delimiters
 508   to jmc@, kristaps@  Sat, 23 Apr 2011 17:41:27 +0200
 509
 510 - mark macros as: page structure domain, manual domain, general text domain
 511   is this useful?
 512
 513 - mention /usr/share/misc/mdoc.template in mdoc(7)?
 514
 515 - Is all the content from http://www.std.com/obi/BSD/doc/usd/28.tbl/tbl
 516   covered in tbl(7)?
 517
 518 ************************************************************************
 519 * performance issues
 520 ************************************************************************
 521
 522 - Why are we using MAP_SHARED, not MAP_PRIVATE for mmap(2)?
 523   How does SQLITE_CONFIG_PAGECACHE actually work?  Document it!
 524   from kristaps@  Sat, 09 Aug 2014 13:51:36 +0200
 525
 526 Several areas can be cleaned up to make mandoc even faster.  These are
 527
 528 - improve hashing mechanism for macros (quite important: performance)
 529
 530 - improve hashing mechanism for characters (not as important)
 531
 532 - the PDF file is HUGE: this can be reduced by using relative offsets
 533
 534 - instead of re-initialising the roff predefined-strings set before each
 535   parse, create a read-only version the first time and copy it
 536   loc *  exist **  algo **  size *  imp **
 537
 538 ************************************************************************
 539 * structural issues
 540 ************************************************************************
 541
 542 - We use the input line number at several places to distinguish
 543   same-line from different-line input.  That plainly doesn't work
 544   with user-defined macros, leading to random breakage.
 545
 546 - Find better ways to prevent endless loops
 547   in roff(7) macro and string expansion.
 548
 549 - Finish cleanup of date handling.
 550   Decide which formats should be recognized where.
 551   Update both mdoc(7) and man(7) documentation.
 552   Triggered by  Tim van der Molen  Tue, 22 Feb 2011 20:30:45 +0100
 553
 554 - Consider creating some views that will make the database more
 555   readable from the sqlite3 shell.  Consider using them to
 556   abstract from the database structure, too.
 557   suggested by espie@  Sat, 19 Apr 2014 14:52:57 +0200
 558
 559 ************************************************************************
 560 * CGI issues
 561 ************************************************************************
 562
 563  - Enable HTTP compression by detecting gzip encoding and filtering
 564    output through libz.
 565  - Sandbox (see OpenSSH).
 566  - Enable caching support via HTTP 304 and If-Modified-Since.
 567  - Allow for cgi.h to be overridden by CGI environment variables.
 568    Otherwise, binary distributions will inherit the compile-time
 569    behaviour, which is not optimal.
 570  - Have Mac OSX systems automatically disable -static compilation of the
 571    CGI: -static isn't supported.
 572