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Annotation of mandoc/TODO, Revision 1.119

1.1       kristaps    1: ************************************************************************
1.37      kristaps    2: * Official mandoc TODO.
1.119   ! kristaps    3: * $Id: TODO,v 1.118 2011/07/07 06:34:13 kristaps Exp $
1.27      kristaps    4: ************************************************************************
                      5:
                      6: ************************************************************************
1.61      schwarze    7: * parser bugs
                      8: ************************************************************************
                      9:
1.116     schwarze   10: - ".\}" on its own line gets translated to bare ".\&"
                     11:   which forces pset() into man(7)
                     12:   and then triggers an unknown macro error
                     13:   reported by naddy@  Sun, 3 Jul 2011 21:52:24 +0200
                     14:
1.81      schwarze   15: - .TP before .SH is still FATAL in man(7)
                     16:   reported by brad@  Sat, 15 Jan 2011 15:54:54 -0500
1.96      schwarze   17:
1.74      schwarze   18: ************************************************************************
                     19: * formatter bugs
                     20: ************************************************************************
1.63      schwarze   21:
1.101     schwarze   22: - tbl(7): Horizontal and vertical lines are formatted badly:
                     23:   With the box option, there is too much white space at the end of cells.
                     24:   Horizontal lines from "=" lines are a bit too long.
                     25:   yuri dot pankov at gmail dot com  Thu, 14 Apr 2011 05:45:26 +0400
                     26:
1.61      schwarze   27: ************************************************************************
1.1       kristaps   28: * missing features
                     29: ************************************************************************
1.70      kristaps   30:
1.79      schwarze   31: --- missing roff features ----------------------------------------------
1.118     kristaps   32:
                     33: - .if n \{
                     34:   .br\}
                     35:   should cause an extra space to be raised.
1.79      schwarze   36:
1.82      schwarze   37: - .ad (adjust margins)
                     38:   .ad l -- adjust left margin only (flush left)
                     39:   .ad r -- adjust right margin only (flush right)
                     40:   .ad c -- center text on line
                     41:   .ad b -- adjust both margins (alias: .ad n)
                     42:   .na   -- temporarily disable adjustment without changing the mode
                     43:   .ad   -- re-enable adjustment without changing the mode
                     44:   Adjustment mode is ignored while in no-fill mode (.nf).
                     45:
1.81      schwarze   46: - .it (line traps) occur in mysql(1), yasm_arch(7)
                     47:   generated by DocBook XSL Stylesheets v1.71.1 <http://docbook.sf.net/>
                     48:   reported by brad@  Sat, 15 Jan 2011 15:48:18 -0500
                     49:
1.80      schwarze   50: - .ns (no-space mode) occurs in xine-config(1)
                     51:   reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500
1.61      schwarze   52:
1.80      schwarze   53: - xloadimage(1) wants .ti (temporary indent), rep by naddy@
1.81      schwarze   54:
                     55: - .ta (tab settings) occurs in ircbug(1) and probably gnats(1)
                     56:   reported by brad@  Sat, 15 Jan 2011 15:50:51 -0500
1.75      schwarze   57:
1.80      schwarze   58: - pod2man expects `tr' to be implemented for \*(-- to work
1.79      schwarze   59:
1.83      schwarze   60: - \c (interrupted text) occurs in chat(8)
1.98      schwarze   61:
1.79      schwarze   62: --- missing mdoc features ----------------------------------------------
                     63:
1.18      schwarze   64: - fix bad block nesting involving multiple identical explicit blocks
                     65:   see the OpenBSD mdoc_macro.c 1.47 commit message
                     66:
1.1       kristaps   67: - .Bl -column .Xo support is missing
                     68:   ultimate goal:
                     69:   restore .Xr and .Dv to
                     70:   lib/libc/compat-43/sigvec.3
                     71:   lib/libc/gen/signal.3
                     72:   lib/libc/sys/sigaction.2
                     73:
1.28      schwarze   74: - edge case: decide how to deal with blk_full bad nesting, e.g.
                     75:   .Sh .Nm .Bk .Nm .Ek .Sh found by jmc@ in ssh-keygen(1)
                     76:   from jmc@  Wed, 14 Jul 2010 18:10:32 +0100
                     77:
1.74      schwarze   78: - \\ is now implemented correctly
                     79:   * when defining strings and macros using .ds and .de
                     80:   * when parsing roff(7) and man(7) macro arguments
                     81:   It does not yet work in mdoc(7) macro arguments
                     82:   because libmdoc does not yet use mandoc_getarg().
                     83:   Also check what happens in plain text, it must be identical to \e.
1.82      schwarze   84:
                     85: - .Bd -filled should not be the same as .Bd -ragged, but align both
                     86:   the left and right margin.  In groff, it is implemented in terms
                     87:   of .ad b, which we don't have either.  Found in cksum(1).
1.22      schwarze   88:
1.10      kristaps   89: - implement blank `Bl -column', such as
                     90:   .Bl -column
                     91:   .It foo Ta bar
                     92:   .El
1.11      kristaps   93:
                     94: - explicitly disallow nested `Bl -column', which would clobber internal
                     95:   flags defined for struct mdoc_macro
1.102     schwarze   96:
                     97: - In .Bl -column .It, the end of the line probably has to be regarded
                     98:   as an implicit .Ta, if there could be one, see the following mildly
                     99:   ugly code from login.conf(5):
                    100:     .Bl -column minpasswordlen program xetcxmotd
                    101:     .It path Ta path Ta value of Dv _PATH_DEFPATH
                    102:     .br
                    103:     Default search path.
                    104:   reported by Michal Mazurek <akfaew at jasminek dot net>
                    105:   via jmc@ Thu, 7 Apr 2011 16:00:53 +0059
1.42      schwarze  106:
                    107: - inside `.Bl -column' phrases, punctuation is handled like normal
                    108:   text, e.g. `.Bl -column .It Fl x . Ta ...' should give "-x -."
                    109:
                    110: - inside `.Bl -column' phrases, TERMP_IGNDELIM handling by `Pf'
                    111:   is not safe, e.g. `.Bl -column .It Pf a b .' gives "ab."
                    112:   but should give "ab ."
1.12      kristaps  113:
                    114: - set a meaningful default if no `Bl' list type is assigned
1.13      kristaps  115:
                    116: - have a blank `It' head for `Bl -tag' not puke
1.20      kristaps  117:
                    118: - prohibit `Nm' from having non-text HEAD children
                    119:   (e.g., NetBSD mDNSShared/dns-sd.1)
                    120:   (mdoc_html.c and mdoc_term.c `Nm' handlers can be slightly simplified)
1.109     schwarze  121:
                    122: - When there is free text in the SYNOPSIS and that free text contains
                    123:   the .Nm macro, groff somehow understands to treat the .Nm as an in-line
                    124:   macro, while mandoc treats it as a block macro and breaks the line.
                    125:   No idea how the logic for distinguishing in-line and block instances
                    126:   should be, needs investigation.
                    127:   uqs@  Thu, 2 Jun 2011 11:03:51 +0200
                    128:   uqs@  Thu, 2 Jun 2011 11:33:35 +0200
1.57      kristaps  129:
1.79      schwarze  130: --- missing man features -----------------------------------------------
                    131:
1.80      schwarze  132: - groff an-ext.tmac macros (.UR, .UE) occur in xine(5)
                    133:   reported by brad@  Sat, 15 Jan 2011 15:45:23 -0500
1.119   ! kristaps  134:
        !           135: - -T[x]html doesn't stipulate non-collapsing spaces in literal mode
1.80      schwarze  136:
1.79      schwarze  137: --- missing tbl features -----------------------------------------------
                    138:
                    139: - implement basic non-parametric .de to support e.g. sox(1)
                    140:   reported by naddy@ Sat, 16 Oct 2010 23:51:57 +0200
                    141:   *** sox(1) still doesn't work, tbl(1) errors need investigation
1.105     kristaps  142:
                    143: - allow standalone `.' to be interpreted as an end-of-layout
                    144:   delimiter instead of being thrown away as a no-op roff line
                    145:   reported by Yuri Pankov, Wed 18 May 2011 11:34:59 CEST
1.79      schwarze  146:
                    147: --- missing misc features ----------------------------------------------
                    148:
                    149: - clean up escape sequence handling, creating three classes:
                    150:   (1) fully implemented, or parsed and ignored without loss of content
                    151:   (2) unimplemented, potentially causing loss of content
                    152:       or serious mangling of formatting (e.g. \n) -> ERROR
                    153:       see textproc/mgdiff(1) for nice examples
                    154:   (3) undefined, just output the character -> perhaps WARNING
                    155:
1.83      schwarze  156: - The \t escape sequence is the same as a literal tab, see for example
                    157:   the ASCII table in hexdump(1) where
                    158:     .Bl -column \&000_nu \&001_so \&002_st \&003_et \&004_eo
                    159:     .It \&000\ nul\t001\ soh\t002\ stx\t003\ etx\t004\ eot\t005\ enq
                    160:   produces
                    161:     000 nul  001 soh  002 stx  003 etx  004 eot  005 enq
                    162:   and the example in oldrdist(1)
                    163:
1.79      schwarze  164: - look at pages generated from reStructeredText, e.g. devel/mercurial hg(1)
                    165:   These are a weird mixture of man(7) and custom autogenerated low-level
                    166:   roff stuff.  Figure out to what extent we can cope.
1.80      schwarze  167:   For details, see http://docutils.sourceforge.net/rst.html
1.79      schwarze  168:   noted by stsp@  Sat, 24 Apr 2010 09:17:55 +0200
                    169:   reminded by nicm@  Mon, 3 May 2010 09:52:41 +0100
1.71      schwarze  170:
                    171: - check compatibility with Plan9:
                    172:   http://swtch.com/usr/local/plan9/tmac/tmac.an
                    173:   http://swtch.com/plan9port/man/man7/man.html
                    174:   "Anthony J. Bentley" <anthonyjbentley@gmail.com> 28 Dec 2010 21:58:40 -0700
1.63      schwarze  175:
1.1       kristaps  176: ************************************************************************
                    177: * formatting issues: ugly output
                    178: ************************************************************************
1.87      kristaps  179:
                    180: - a column list with blank `Ta' cells triggers a spurrious
                    181:   start-with-whitespace printing of a newline
1.33      schwarze  182:
1.67      schwarze  183: - double quotes inside double quotes are escaped by doubling them
1.74      schwarze  184:   implement this in mdoc(7), too
                    185:   so far, we only have it in roff(7) and man(7)
1.67      schwarze  186:   reminded by millert@  Thu, 09 Dec 2010 17:29:52 -0500
                    187:
1.28      schwarze  188: - perl(1) SYNOPSIS looks bad; reported by deraadt@
1.29      kristaps  189:   1) man(7) seems to need SYNOPSIS .Nm blocks, too
1.1       kristaps  190:
1.39      schwarze  191: - In .Bl -column,
                    192:   .It Em Authentication<tab>Key Length
                    193:   ought to render "Key Length" with emphasis, too,
                    194:   see OpenBSD iked.conf(5).
                    195:
1.1       kristaps  196: - empty phrases in .Bl column produce too few blanks
                    197:   try e.g. .Bl -column It Ta Ta
                    198:   reported by millert Fri, 02 Apr 2010 16:13:46 -0400
1.48      schwarze  199:
1.83      schwarze  200: - .%T can have trailing punctuation.  Currently, it puts the trailing
                    201:   punctuation into a trailing MDOC_TEXT element inside its own scope.
                    202:   That element should rather be outside its scope, such that the
                    203:   punctuation does not get underlines.  This is not trivial to
                    204:   implement because .%T then needs some features of in_line_eoln() -
                    205:   slurp all arguments into one single text element - and one feature
                    206:   of in_line() - put trailing punctuation out of scope.
                    207:   Found in mount_nfs(8) and exports(5), search for "Appendix".
                    208:
1.48      schwarze  209: - in enclosures, mandoc sometimes fancies a bogus end of sentence
                    210:   reminded by jmc@  Thu, 23 Sep 2010 18:13:39 +0059
1.35      kristaps  211:
1.1       kristaps  212: ************************************************************************
1.104     kristaps  213: * formatting issues: gratuitous differences
1.1       kristaps  214: ************************************************************************
1.65      kristaps  215:
                    216: - .Rv (and probably .Ex) print different text if an `Nm' has been named
                    217:   or not (run a manual without `Nm blah' to see this).  I'm not sure
                    218:   that this exists in the wild, but it's still an error.
1.38      schwarze  219:
                    220: - In .Bl -bullet, the groff bullet is "+\b+\bo\bo", the mandoc bullet
                    221:   is just "o\bo".
                    222:   see for example OpenBSD ksh(1)
                    223:
                    224: - The characters "|" and "\*(Ba" should never be bold,
                    225:   not even in the middle of a word, e.g. ".Cm b\*(Bac" in
                    226:   "mknod [-m mode] name b|c major minor"
                    227:   in OpenBSD ksh(1)
                    228:
                    229: - A bogus .Pp between two .It must not produce a double blank line,
1.39      schwarze  230:   see between -R and -r in OpenBSD rm(1), before "update" in mount(8),
1.83      schwarze  231:   or in DIAGNOSTICS in init(8), or before "is always true" in ksh(1).
                    232:   The same happens with .Pp just before .El, see bgpd.conf(5).
1.68      kristaps  233:   Also have `It' complain if `Pp' is invoked at certain times (not
                    234:   -compact?).
1.103     schwarze  235:
                    236: - .Pp between two .It in .Bl -column should produce one,
                    237:   not two blank lines, see e.g. login.conf(5).
                    238:   reported by jmc@  Sun, 17 Apr 2011 14:04:58 +0059
1.39      schwarze  239:
1.83      schwarze  240: - If the *first* line after .It is .Pp, break the line right after
                    241:   the tag, do not pad with space characters before breaking.
                    242:   See the description of the a, c, and i commands in sed(1).
                    243:
                    244: - If the first line after .It is .D1, do not assert a blank line
                    245:   in between, see for example tmux(1).
                    246:   reported by nicm@  13 Jan 2011 00:18:57 +0000
                    247:
1.39      schwarze  248: - .Nx 1.0a
                    249:   should be "NetBSD 1.0A", not "NetBSD 1.0a",
                    250:   see OpenBSD ccdconfig(8).
1.83      schwarze  251:
1.39      schwarze  252: - In .Bl -tag, if a tag exceeds the right margin and must be continued
                    253:   on the next line, it must be indented by -width, not width+1;
                    254:   see "rule block|pass" in OpenBSD ifconfig(8).
1.56      schwarze  255:
1.83      schwarze  256: - When the -width string contains macros, the macros must be rendered
                    257:   before measuring the width, for example
                    258:     .Bl -tag -width ".Dv message"
                    259:   in magic(5), located in src/usr.bin/file, is the same
                    260:   as -width 7n, not -width 11n.
                    261:
1.56      schwarze  262: - The \& zero-width character counts as output.
                    263:   That is, when it is alone on a line between two .Pp,
                    264:   we want three blank lines, not two as in mandoc.
1.63      schwarze  265:
                    266: - When .Fn arguments exceed one output line, all but the first
                    267:   should be indented, see e.g. rpc(3);
                    268:   reported by jmc@ on discuss@  Fri, 29 Oct 2010 13:48:33 +0100
1.83      schwarze  269:
                    270: - .Ns should work when called at the end of an input line, see
                    271:   the following code in vi(1):
                    272:     .It Xo
                    273:     .Op Ar line
                    274:     .Cm a Ns Op Cm ppend Ns
                    275:     .Op Cm !\&
                    276:     .Xc
                    277:     The input text is appended after the specified line.
                    278:
1.64      schwarze  279: - Header lines of excessive length:
                    280:   Port OpenBSD man_term.c rev. 1.25 to mdoc_term.c
                    281:   and document it in mdoc(7) and man(7) COMPATIBILITY
                    282:   found while talking to Chris Bennett
1.83      schwarze  283:
                    284: - In man(7), the sequence
                    285:     .HP
                    286:     one line of regular text
                    287:     .SH
                    288:   should not produce two blank lines before the .SH,
                    289:   see for example named-checkconf(8).
                    290:
                    291: - In man(7), the sequence
1.98      schwarze  292:     .SH HEADER
                    293:     <blank line>
                    294:     .PP
                    295:     regular text
                    296:   should not produce any blank lines between the header and the text,
                    297:   see for example rsync(1).
                    298:   Reported by naddy@  Mon, 28 Mar 2011 20:45:42 +0200
                    299:
                    300: - In man(7), the sequence
                    301:     regular text
                    302:     .IP
                    303:     .IP "tag"
                    304:     indented text
                    305:   should produce one, not four blank lines between the regular text
                    306:   and the tag, see for example rsync(1).
                    307:   Likewise,
                    308:     regular text
                    309:     .IP
                    310:     indented text
                    311:   should produce one, not two blank lines in between, and
                    312:     regular text
                    313:     .IP
                    314:     .RS
                    315:     .IP tag
                    316:     indented text
                    317:   should produce one, not three blank lines.
                    318:   Reported by naddy@  Mon, 28 Mar 2011 20:45:42 +0200
1.83      schwarze  319:
                    320: - trailing whitespace must be ignored even when followed by a font escape,
                    321:   see for example
                    322:     makes
                    323:     \fBdig \fR
                    324:     operate in batch mode
                    325:   in dig(1).
1.75      schwarze  326:
                    327: ************************************************************************
                    328: * error reporting issues
                    329: ************************************************************************
1.1       kristaps  330:
1.9       kristaps  331: ************************************************************************
                    332: * performance issues
                    333: ************************************************************************
                    334:
                    335: Several areas can be cleaned up to make mandoc even faster.  These are
                    336:
                    337: - improve hashing mechanism for macros (quite important: performance)
                    338:
                    339: - improve hashing mechanism for characters (not as important)
1.23      kristaps  340:
1.37      kristaps  341: - the PDF file is HUGE: this can be reduced by using relative offsets
1.115     kristaps  342:
                    343: - instead of re-initialising the roff predefined-strings set before each
                    344:   parse, create a read-only version the first time and copy it
1.37      kristaps  345:
1.23      kristaps  346: ************************************************************************
                    347: * structural issues
                    348: ************************************************************************
1.67      schwarze  349:
                    350: - Find better ways to prevent endless loops
                    351:   in roff(7) macro and string expansion.
1.91      schwarze  352:
1.96      schwarze  353: - Finish cleanup of date handling.
1.91      schwarze  354:   Decide which formats should be recognized where.
                    355:   Update both mdoc(7) and man(7) documentation.
                    356:   Triggered by  Tim van der Molen  Tue, 22 Feb 2011 20:30:45 +0100

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