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Diff for /mandoc/TODO between version 1.42 and 1.181

version 1.42, 2010/08/20 22:51:29 version 1.181, 2014/10/10 08:44:24
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 ************************************************************************  ************************************************************************
   
 ************************************************************************  ************************************************************************
   * crashes
   ************************************************************************
   
   - The abort() in bufcat(), html.c, can be triggered via buffmt_includes()
     by running -Thtml -Oincludes on a file containing a long .In argument.
     Fixing this will probably require reworking the whole bufcat() concept.
   
   ************************************************************************
 * missing features  * missing features
 ************************************************************************  ************************************************************************
   
 - explicit blocks with missing end macro should be implicitely closed  --- missing roff features ----------------------------------------------
   at the end of the enclosing block, e.g. .Bl It (El) Sh  
   reminded by stsp@  in net/pptp pptp.8  Fri, 23 Apr 2010 20:32:39 +0200  
   
   - .ad (adjust margins)
     .ad l -- adjust left margin only (flush left)
     .ad r -- adjust right margin only (flush right)
     .ad c -- center text on line
     .ad b -- adjust both margins (alias: .ad n)
     .na   -- temporarily disable adjustment without changing the mode
     .ad   -- re-enable adjustment without changing the mode
     Adjustment mode is ignored while in no-fill mode (.nf).
   
   - .fc (field control)
     found by naddy@ in xloadimage(1)
   
   - .nr third argument (auto-increment step size, requires \n+)
     found by bentley@ in sbcl(1)  Mon, 9 Dec 2013 18:36:57 -0700
   
   - .ns (no-space mode) occurs in xine-config(1)
     reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500
   
   - .ta (tab settings) occurs in ircbug(1) and probably gnats(1)
     reported by brad@  Sat, 15 Jan 2011 15:50:51 -0500
     also Tcl_NewStringObj(3) via wiz@  Wed, 5 Mar 2014 22:27:43 +0100
   
   - .ti (temporary indent)
     found by naddy@ in xloadimage(1)
     found by bentley@ in nmh(1)  Mon, 23 Apr 2012 13:38:28 -0600
   
   - .while and .shift
     found by jca@ in ratpoison(1)  Sun, 30 Jun 2013 12:01:09 +0200
   
   - \c (interrupted text) should prevent the line break
     even inside .Bd literal; that occurs in chat(8)
     also found in cclive(1) - DocBook output
   
   - \h horizontal move
     found in cclive(1) DocBook output
     Anthony J. Bentley on discuss@  Sat, 21 Sep 2013 22:29:34 -0600
   
   - \n+ and \n- numerical register increment and decrement
     found by bentley@ in sbcl(1)  Mon, 9 Dec 2013 18:36:57 -0700
   
   - \w'' width measurements
     would not be very useful without an expression parser, see below
     needed for Tcl_NewStringObj(3) via wiz@  Wed, 5 Mar 2014 22:27:43 +0100
   
   - using undefined strings or macros defines them to be empty
     wl@  Mon, 14 Nov 2011 14:37:01 +0000
   
   --- missing mdoc features ----------------------------------------------
   
 - fix bad block nesting involving multiple identical explicit blocks  - fix bad block nesting involving multiple identical explicit blocks
   see the OpenBSD mdoc_macro.c 1.47 commit message    see the OpenBSD mdoc_macro.c 1.47 commit message
   
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   .Sh .Nm .Bk .Nm .Ek .Sh found by jmc@ in ssh-keygen(1)    .Sh .Nm .Bk .Nm .Ek .Sh found by jmc@ in ssh-keygen(1)
   from jmc@  Wed, 14 Jul 2010 18:10:32 +0100    from jmc@  Wed, 14 Jul 2010 18:10:32 +0100
   
 - auto-Bk in the SYNOPSIS  - \\ is now implemented correctly
   patch from kristaps@  Fri, 16 Jul 2010 14:51:24 +0200    * when defining strings and macros using .ds and .de
   to be revisited after OpenBSD 4.8 tree unlock    * when parsing roff(7) and man(7) macro arguments
     It does not yet work in mdoc(7) macro arguments
     because libmdoc does not yet use mandoc_getarg().
     Also check what happens in plain text, it must be identical to \e.
   
 - implement \\  - .Bd -centered implies -filled, not -unfilled, which is not
   in plain text, identical to \e    easy to implement; it requires code similar to .ce, which
   as a macro argument, identical to \ i.e. escaping the next character    we don't have either.
   We do not have macro definitions yet; if we implement them,    Besides, groff has bug causing text right *before* .Bd -centered
   \\ must behave in a macro def like in a macro argument,    to be centered as well.
   and when using the macro, it must expand yet again.  
   
 - look at bsd.lv tbl(1)  - .Bd -filled should not be the same as .Bd -ragged, but align both
   from kristaps@  Fri, 11 Sep 2009 17:10:53 +0200    the left and right margin.  In groff, it is implemented in terms
   also look at the mail from Thomas Klausner wiz at NetBSD    of .ad b, which we don't have either.  Found in cksum(1).
     on Wed, 2 Jun 2010 11:01:29 +0200  
   joerg@ has patches for this somewhere...  
   
 - look at pages generated from reStructeredText, e.g. devel/mercurial hg(1)  
   These are a weird mixture of man(7) and custom autogenerated low-level  
   roff stuff.  Figure out to what extent we can cope.  
   noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200  
   reminded by nicm@  Mon, 3 May 2010 09:52:41 +0100  
   
 - implement blank `Bl -column', such as  - implement blank `Bl -column', such as
   .Bl -column    .Bl -column
   .It foo Ta bar    .It foo Ta bar
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 - explicitly disallow nested `Bl -column', which would clobber internal  - explicitly disallow nested `Bl -column', which would clobber internal
   flags defined for struct mdoc_macro    flags defined for struct mdoc_macro
   
   - In .Bl -column .It, the end of the line probably has to be regarded
     as an implicit .Ta, if there could be one, see the following mildly
     ugly code from login.conf(5):
       .Bl -column minpasswordlen program xetcxmotd
       .It path Ta path Ta value of Dv _PATH_DEFPATH
       .br
       Default search path.
     reported by Michal Mazurek <akfaew at jasminek dot net>
     via jmc@ Thu, 7 Apr 2011 16:00:53 +0059
   
 - inside `.Bl -column' phrases, punctuation is handled like normal  - inside `.Bl -column' phrases, punctuation is handled like normal
   text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."    text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."
   
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 - have a blank `It' head for `Bl -tag' not puke  - have a blank `It' head for `Bl -tag' not puke
   
   - check whether it is correct that `D1' uses INDENT+1;
     does it need its own constant?
   
 - prohibit `Nm' from having non-text HEAD children  - prohibit `Nm' from having non-text HEAD children
   (e.g., NetBSD mDNSShared/dns-sd.1)    (e.g., NetBSD mDNSShared/dns-sd.1)
   (mdoc_html.c and mdoc_term.c `Nm' handlers can be slightly simplified)    (mdoc_html.c and mdoc_term.c `Nm' handlers can be slightly simplified)
   
 - allow `Qq', `Dq', `Sq', `Aq', `Bq' to have 0 arguments  - support translated section names
   noted by Alex Kozlov 08/06/10 23:05    e.g. x11/scrotwm scrotwm_es.1:21:2: error: NAME section must be first
     that one uses NOMBRE because it is spanish...
     deraadt tends to think that section-dependent macro behaviour
     is a bad idea in the first place, so this may be irrelevant
   
 - 'br\} doesn't correctly close scope.  - When there is free text in the SYNOPSIS and that free text contains
   Noted by joerg@, 28/7/2010.    the .Nm macro, groff somehow understands to treat the .Nm as an in-line
     macro, while mandoc treats it as a block macro and breaks the line.
     No idea how the logic for distinguishing in-line and block instances
     should be, needs investigation.
     uqs@  Thu, 2 Jun 2011 11:03:51 +0200
     uqs@  Thu, 2 Jun 2011 11:33:35 +0200
   
   --- missing man features -----------------------------------------------
   
   - -T[x]html doesn't stipulate non-collapsing spaces in literal mode
   
   --- missing tbl features -----------------------------------------------
   
   - look at the POSIX manuals in the books/man-pages-posix port,
     they use some unsupported tbl(7) features.
   
   - investigate tbl(1) errors in sox(1)
     see also naddy@  Sat, 16 Oct 2010 23:51:57 +0200
   
   - allow standalone `.' to be interpreted as an end-of-layout
     delimiter instead of being thrown away as a no-op roff line
     reported by Yuri Pankov, Wed 18 May 2011 11:34:59 CEST
   
   --- missing misc features ----------------------------------------------
   
   - italic correction (\/) in PostScript mode
     Werner LEMBERG on groff at gnu dot org  Sun, 10 Nov 2013 12:47:46
   
   - When makewhatis(8) encounters a FATAL parse error,
     it silently treats the file as formatted, which makes no sense
     at all for paths like man1/foo.1 - and which also contradicts
     what the manual says at the end of the description.
     The end result will be ENOENT for file names returned
     by mansearch() in manpage.file.
   
   - makewhatis(8) for preformatted pages:
     parse the section number from the header line
     and compare to the section number from the directory name
   
   - Does makewhatis(8) detect missing NAME sections, missing names,
     and missing descriptions in all the file formats?
   
   - clean up escape sequence handling, creating three classes:
     (1) fully implemented, or parsed and ignored without loss of content
     (2) unimplemented, potentially causing loss of content
         or serious mangling of formatting (e.g. \n) -> ERROR
         see textproc/mgdiff(1) for nice examples
     (3) undefined, just output the character -> perhaps WARNING
   
   - kettenis wants base roff, ms, and me  Fri, 1 Jan 2010 22:13:15 +0100 (CET)
   
   --- compatibility checks -----------------------------------------------
   
   - is .Bk implemented correctly in modern groff?
     sobrado@  Tue, 19 Apr 2011 22:12:55 +0200
   
   - compare output to Heirloom roff, Solaris roff, and
     http://repo.or.cz/w/neatroff.git  http://litcave.rudi.ir/
   
   - look at AT&T DWB http://www2.research.att.com/sw/download
     Carsten Kunze <carsten dot kunze at arcor dot de> has patches
     Mon, 4 Aug 2014 17:01:28 +0200
   
   - look at pages generated from reStructeredText, e.g. devel/mercurial hg(1)
     These are a weird mixture of man(7) and custom autogenerated low-level
     roff stuff.  Figure out to what extent we can cope.
     For details, see http://docutils.sourceforge.net/rst.html
     noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200
     reminded by nicm@  Mon, 3 May 2010 09:52:41 +0100
   
   - look at pages generated from ronn(1) github.com/rtomayko/ronn
     (based on markdown)
   
   - look at pages generated from Texinfo source by yat2m, e.g. security/gnupg
     First impression is not that bad.
   
   - look at pages generated by pandoc; see
     https://github.com/jgm/pandoc/blob/master/src/Text/Pandoc/Writers/Man.hs
     porting planned by kili@  Thu, 19 Jun 2014 19:46:28 +0200
   
   - check compatibility with Plan9:
     http://swtch.com/usr/local/plan9/tmac/tmac.an
     http://swtch.com/plan9port/man/man7/man.html
     "Anthony J. Bentley" <anthonyjbentley@gmail.com> 28 Dec 2010 21:58:40 -0700
   
   - check compatibility with the man(7) formatter
     https://raw.githubusercontent.com/rofl0r/hardcore-utils/master/man.c
   
 ************************************************************************  ************************************************************************
 * formatting issues: ugly output  * formatting issues: ugly output
 ************************************************************************  ************************************************************************
   
 - perl(1) SYNOPSIS looks bad; reported by deraadt@  - a column list with blank `Ta' cells triggers a spurrious
   1) man(7) seems to need SYNOPSIS .Nm blocks, too    start-with-whitespace printing of a newline
   
 - In .Bl -column,  - In .Bl -column,
   .It Em Authentication<tab>Key Length    .It Em Authentication<tab>Key Length
   ought to render "Key Length" with emphasis, too,    ought to render "Key Length" with emphasis, too,
   see OpenBSD iked.conf(5).    see OpenBSD iked.conf(5).
     reported again Nicolas Joly via wiz@ Wed, 12 Oct 2011 00:20:00 +0200
   
 - empty phrases in .Bl column produce too few blanks  - empty phrases in .Bl column produce too few blanks
   try e.g. .Bl -column It Ta Ta    try e.g. .Bl -column It Ta Ta
   reported by millert Fri, 02 Apr 2010 16:13:46 -0400    reported by millert Fri, 02 Apr 2010 16:13:46 -0400
   
 - %A doesn't put an "and" before the final author name.  - .%T can have trailing punctuation.  Currently, it puts the trailing
     punctuation into a trailing MDOC_TEXT element inside its own scope.
     That element should rather be outside its scope, such that the
     punctuation does not get underlines.  This is not trivial to
     implement because .%T then needs some features of in_line_eoln() -
     slurp all arguments into one single text element - and one feature
     of in_line() - put trailing punctuation out of scope.
     Found in mount_nfs(8) and exports(5), search for "Appendix".
   
 ************************************************************************  - Trailing punctuation after .%T triggers EOS spacing, at least
 * formatting issues: gratuitious differences    outside .Rs (eek!).  Simply setting ARGSFL_DELIM for .%T is not
 ************************************************************************    the right solution, it sends mandoc into an endless loop.
     reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
   
 - .%T should be quoted, not underlined, when .%J is also present,  - global variables in the SYNOPSIS of section 3 pages
   to better distinguish the contents of .%T and .%J,    .Vt vs .Vt/.Va vs .Ft/.Va vs .Ft/.Fa ...
   see for example OpenBSD cat(1)    from kristaps@  Tue, 08 Jun 2010 11:13:32 +0200
   
 - .It ${name Ns [ selector ] Ns }  - in enclosures, mandoc sometimes fancies a bogus end of sentence
   should be "${name[selector]}" not "${name [selector]}"    reminded by jmc@  Thu, 23 Sep 2010 18:13:39 +0059
   This is parsed as  
   text("${name") text("[") Ns() text(selector)...  
   Opening punctuation should not fall out of .Ns.  
   see for example OpenBSD csh(1)  
   
 - .%A should append the last author with " and " (if there are two)  - formatting /usr/local/man/man1/latex2man.1 with groff and mandoc
   or ", and " (if there are more), not ", "    reveals lots of bugs both in groff and mandoc...
   see for example OpenBSD csh(1)    reported by bentley@  Wed, 22 May 2013 23:49:30 -0600
   
   --- PDF issues ---------------------------------------------------------
   
   - PDF output doesn't use a monospaced font for .Bd -literal
     Example: "mandoc -Tpdf afterboot.8 > output.pdf && pdfviewer output.pdf".
     Search the text "Routing tables".
     Also check what PostScript mode does when fixing this.
     reported by juanfra@ Wed, 04 Jun 2014 21:44:58 +0200
   
   --- HTML issues --------------------------------------------------------
   
   - <dl><dt><dd> formatting is ugly
     hints are easy to find on the web, e.g.
     http://stackoverflow.com/questions/1713048/
     see also matthew@  Fri, 18 Jul 2014 19:25:12 -0700
   
   - The tables used to render the three-part page headers actually force
     the width of the <body> to the max-width given for <html>.
     Not yet sure how to fix that...
     Observed by an Anonymous Coward on undeadly.org:
     http://undeadly.org/cgi?action=article&sid=20140925064244&pid=1
   
   - consider whether <var> can be used for Ar Dv Er Ev Fa Va.
     from bentley@  Wed, 13 Aug 2014 09:17:55 -0600
   
   - check https://github.com/trentm/mdocml
   
   ************************************************************************
   * formatting issues: gratuitous differences
   ************************************************************************
   
   - .Rv (and probably .Ex) print different text if an `Nm' has been named
     or not (run a manual without `Nm blah' to see this).  I'm not sure
     that this exists in the wild, but it's still an error.
   
 - In .Bl -bullet, the groff bullet is "+\b+\bo\bo", the mandoc bullet  - In .Bl -bullet, the groff bullet is "+\b+\bo\bo", the mandoc bullet
   is just "o\bo".    is just "o\bo".
   see for example OpenBSD ksh(1)    see for example OpenBSD ksh(1)
   
 - .No text No ) is "text )", not "text)"  - In .Bl -enum -width 0n, groff continues one the same line after
   see the terrible example    the number, mandoc breaks the line.
     case word in [[(]  pattern [| pattern] ... ) list ;; ] ... esac    mail to kristaps@  Mon, 20 Jul 2009 02:21:39 +0200
   in OpenBSD ksh(1)  
   
 - .Sm should *not* produce as a blank line in .Bd -literal  - .Pp between two .It in .Bl -column should produce one,
   see for example "Brace expansion" in OpenBSD ksh(1)    not two blank lines, see e.g. login.conf(5).
     reported by jmc@  Sun, 17 Apr 2011 14:04:58 +0059
     reported again by sthen@  Wed, 18 Jan 2012 02:09:39 +0000 (UTC)
   
 - The characters "|" and "\*(Ba" should never be bold,  - If the *first* line after .It is .Pp, break the line right after
   not even in the middle of a word, e.g. ".Cm b\*(Bac" in    the tag, do not pad with space characters before breaking.
   "mknod [-m mode] name b|c major minor"    See the description of the a, c, and i commands in sed(1).
   in OpenBSD ksh(1)  
   
 - A bogus .Pp between two .It must not produce a double blank line,  - If the first line after .It is .D1, do not assert a blank line
   see between -R and -r in OpenBSD rm(1), before "update" in mount(8),    in between, see for example tmux(1).
   or in DIAGNOSTICS in init(8).    reported by nicm@  13 Jan 2011 00:18:57 +0000
   
 - .Bd -literal and .Bd -unfilled are *not* identical.  - Trailing punctuation after .It should trigger EOS spacing.
   In -literal, tabs are 8 spaces.    reported by Nicolas Joly  Sat, 17 Nov 2012 11:49:54 +0100
   In -unfilled, tabs are 5 spaces, just like in -filled and -ragged.    Probably, this should be fixed somewhere in termp_it_pre(), not sure.
   See the CCDF_* display in OpenBSD ccdconfig(8).  
   
 - In .Bd -unfilled, .Pp should produce one blank line, not two;  
   see the ccd.conf display in OpenBSD ccdconfig(8).  
   
 - .Nx 1.0a  - .Nx 1.0a
   should be "NetBSD 1.0A", not "NetBSD 1.0a",    should be "NetBSD 1.0A", not "NetBSD 1.0a",
   see OpenBSD ccdconfig(8).    see OpenBSD ccdconfig(8).
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   on the next line, it must be indented by -width, not width+1;    on the next line, it must be indented by -width, not width+1;
   see "rule block|pass" in OpenBSD ifconfig(8).    see "rule block|pass" in OpenBSD ifconfig(8).
   
 - When .%T is used outside an .Rs context and with a trailing comma,  - When the -width string contains macros, the macros must be rendered
   there is no point in rendering two commata,    before measuring the width, for example
   see the first paragraph of the DESCRIPTION in OpenBSD mount_nfs(8).      .Bl -tag -width ".Dv message"
     in magic(5), located in src/usr.bin/file, is the same
     as -width 7n, not -width 11n.
     The same applies to .Bl -column column widths;
     reported again by Nicolas Joly Thu, 1 Mar 2012 13:41:26 +0100 via wiz@ 5 Mar
     reported again by Franco Fichtner Fri, 27 Sep 2013 21:02:28 +0200
     An easy partial fix would be to just skip the first word if it starts
     with a dot, including any following white space, when measuring.
   
 - When .%T is used outside an .Rs context and without a trailing comma,  - The \& zero-width character counts as output.
   no comma should be rendered at all,    That is, when it is alone on a line between two .Pp,
   see the first paragraph of the DESCRIPTION in OpenBSD exports(5).    we want three blank lines, not two as in mandoc.
   
 - Bogus .Pp before .Bl should not cause a double blank line,  - Header lines of excessive length:
   see "The route utility provides the following simple commands:"    Port OpenBSD man_term.c rev. 1.25 to mdoc_term.c
   in OpenBSD route(8).    and document it in mdoc(7) and man(7) COMPATIBILITY
     found while talking to Chris Bennett
   
   - trailing whitespace must be ignored even when followed by a font escape,
     see for example
       makes
       \fBdig \fR
       operate in batch mode
     in dig(1).
   
 ************************************************************************  ************************************************************************
   * warning issues
   ************************************************************************
   
   - check that MANDOCERR_BADTAB is thrown in the right cases,
     i.e. when finding a literal tab character in fill mode,
     and possibly change the wording of the warning message
     to refer to fill mode, not literal mode
     See the mail from Werner LEMBERG on the groff list,
     Fri, 14 Feb 2014 18:54:42 +0100 (CET)
   
   - warn about "new sentence, new line"
   
   - mandoc_special does not really check the escape sequence,
     but just the overall format
   
   - integrate mdoclint into mandoc ("end-of-line whitespace" thread)
     from jmc@  Mon, 13 Jul 2009 17:12:09 +0100
     from kristaps@  Mon, 13 Jul 2009 18:34:53 +0200
     from jmc@  Mon, 13 Jul 2009 17:45:37 +0059
     from kristaps@  Mon, 13 Jul 2009 19:02:03 +0200
   
   - -Tlint parser errors and warnings to stdout
     to tech@mdocml, naddy@  Wed, 28 Sep 2011 11:21:46 +0200
     wait!  kristaps@  Sun, 02 Oct 2011 17:12:52 +0200
   
   - for system errors, use errno/strerror/warn/err
   
   ************************************************************************
   * documentation issues
   ************************************************************************
   
   - mention hyphenation rules:
     breaking at letter-letter in text mode (not macro args)
     proper hyphenation is unimplemented
   
   - talk about spacing around delimiters
     to jmc@, kristaps@  Sat, 23 Apr 2011 17:41:27 +0200
   
   - mark macros as: page structure domain, manual domain, general text domain
     is this useful?
   
   - mention /usr/share/misc/mdoc.template in mdoc(7)?
   
   ************************************************************************
 * performance issues  * performance issues
 ************************************************************************  ************************************************************************
   
   - Why are we using MAP_SHARED, not MAP_PRIVATE for mmap(2)?
     How does SQLITE_CONFIG_PAGECACHE actually work?  Document it!
     from kristaps@  Sat, 09 Aug 2014 13:51:36 +0200
   
 Several areas can be cleaned up to make mandoc even faster.  These are  Several areas can be cleaned up to make mandoc even faster.  These are
   
 - improve hashing mechanism for macros (quite important: performance)  - improve hashing mechanism for macros (quite important: performance)
Line 175  Several areas can be cleaned up to make mandoc even fa
Line 424  Several areas can be cleaned up to make mandoc even fa
   
 - the PDF file is HUGE: this can be reduced by using relative offsets  - the PDF file is HUGE: this can be reduced by using relative offsets
   
   - instead of re-initialising the roff predefined-strings set before each
     parse, create a read-only version the first time and copy it
   
 ************************************************************************  ************************************************************************
 * structural issues  * structural issues
 ************************************************************************  ************************************************************************
   
 - rendering frontend code can calculate widths only for plain strings,  - We use the input line number at several places to distinguish
   not for strings containing escape sequences.  For example, this    same-line from different-line input.  That plainly doesn't work
   hinders calculation of the indent required for .Nm \&[ in text(1).    with user-defined macros, leading to random breakage.
   comments from kristaps@  Wed, 21 Jul 2010 23:26:08 +0200  
   
 - another example of the same problem:  - Find better ways to prevent endless loops
   .Bl -tag -width "\eD{format}XX" -compact    in roff(7) macro and string expansion.
   in OpenBSD ksh(1) gives the wrong width  
   because "\e" is one character in groff, two in mandoc  - Finish cleanup of date handling.
     Decide which formats should be recognized where.
     Update both mdoc(7) and man(7) documentation.
     Triggered by  Tim van der Molen  Tue, 22 Feb 2011 20:30:45 +0100
   
 - Now that `ds' is minimally supported, we can get rid of some  - Consider creating some views that will make the database more
   predefined strings.  \*(C+ has already been thrown out.  Track these    readable from the sqlite3 shell.  Consider using them to
   down and whack them.  Look in e.g. gcc.1 for the top-level `ds'    abstract from the database structure, too.
   invocations.  These are reproduced across most crappy GNU manuals.    suggested by espie@  Sat, 19 Apr 2014 14:52:57 +0200
   
   ************************************************************************
   * CGI issues
   ************************************************************************
   
    - Enable HTTP compression by detecting gzip encoding and filtering
      output through libz.
    - Sandbox (see OpenSSH).
    - Enable caching support via HTTP 304 and If-Modified-Since.
    - Allow for cgi.h to be overridden by CGI environment variables.
      Otherwise, binary distributions will inherit the compile-time
      behaviour, which is not optimal.
    - Have Mac OSX systems automatically disable -static compilation of the
      CGI: -static isn't supported.
   
   ************************************************************************
   * eqn missing features
   ************************************************************************
   
    - set, delim, fonts

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  Added in v.1.181

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