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missing info reported by Ian <ropers at gmail dot com> on misc@
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suggested by Michal Nowak <mnowak at startmail dot com>
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Jan Stary <hans at stare dot cz> found it in an ancient groffer(1)
manual page (version 1.19) on MacOS X Mojave.
Having .break not implemented wasn't a particularly bright idea
because obviously, it tended to cause infinite loops.
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rather than in the man(7) parser and formatters, document them in the
roff(7) manual, where they belong, rather than in the man(7) manual.
Mention that they imply an output line break, and mention which macros
imply these requests.
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and also adding some cross references for important escape sequences
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Unify handling of \f and .ft.
Support \f4 (bold+italic).
Support ".ft BI" and ".ft CW" for terminal output.
Support the .ft request in HTML output.
Reject the bogus fonts \f(C1, \f(C2, \f(C3, and \f(CP.
In regress.pl, only strip leading whitespace in math mode.
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* Add the missing special character \_ (underscore).
* Partial implementations of \a (leader character)
and \E (uninterpreted escape character).
* Parse and ignore \r (reverse line feed).
* Add a WARNING message about undefined escape sequences.
* Add an UNSUPP message about unsupported escape sequences.
* Mark \! and \? (transparent throughput)
and \O (suppress output) as unsupported.
* Treat the various variants of zero-width spaces as one-byte escape
sequences rather than as special characters, to avoid defining bogus
forms with square brackets.
* For special characters with one-byte names, do not define bogus
forms with square brackets, except for \[-], which is valid.
* In the form with square brackets, undefined special characters do not
fall back to printing the name verbatim, not even for one-byte names.
* Starting a special character name with a blank is an error.
* Undefined escape sequences never abort formatting of the input
string, not even in HTML output mode.
* Document the newly handled escapes, and a few that were missing.
* Regression tests for most of the above.
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from the past that are no longer true
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instead, use .Bl -tag like everywhere else. The same was already
done for requests quite some time ago. Also, consistently mark up
escape sequences with .Ic, just like requests.
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definition) request, used for example by groff_hdtbl(7).
This simplistic implementation may interact incorrectly
with the .tr (input character translation) request.
But come on, you are not only using .char *and* .tr, but you do so
with respect to the same character in the same manual page?
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Needed for example by groff_hdtbl(7).
There are two limitations:
It does not support nested .while requests yet,
and each .while loop must start and end in the same scope.
The roff_parseln() return codes are now more flexible
and allow OR'ing options.
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for example used by groff_hdtbl(7) and groff_mom(7).
Also correctly interpolate arguments during nested macro execution
even after .shift and .return, implemented using a stack of argument
arrays.
Note that only read.c, but not roff.c can detect the end of a macro
execution, and the existence of .shift implies that arguments cannot
be interpolated up front, so unfortunately, this includes a partial
revert of roff.c rev. 1.337, moving argument interpolation back into
the function roff_res().
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quoted) in addition to the already supported \\$* (similar, but
unquoted). Then use \\$@ to improve the implementation of
the .als request (macro alias).
Needed by groff_hdtbl(7).
Gosh, it feels like the manual pages of the groff package are
exercising every bloody roff(7) feature under the sun. In the
manual page source code itself, not merely in the implementation
of the used macro packages, that is.
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roff conditional, except that the .char request still isn't supported
and that behaviour differs from groff in many edge cases.
But at least valid character names and numbers are now distinguished
from invalid ones.
This also fixes the bug that parsing of the 'c' conditional was
incomplete, which resulted in leaking the tested character to the
input parser at the beginning of the body when the condition was
inverted.
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with comment); used for example by gropdf(1)
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While here, delete the section about predefined strings.
For manual pages, the concept is not important enough to be discussed
in such a prominent place, and some aspects of the text were also
misleading. Add a shorter version of the relevant parts to the
description of the \* escape sequence instead.
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and some groff manual pages actually use them in .ft requests.
It's easy enough to handle these .ft requests in mandoc, too.
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Examples of manual pages (ab)using it
include groff(7), chem(1), groff_mom(7), and groff_hdtbl(7).
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* .nr optional third argument (auto-increment step size)
* \n+ and \n- numerical register auto-increment and -decrement
bentley@ reported on Dec 9, 2013 that lang/sbcl(1) uses these.
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used for example by zoem(1)
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This clearly works when .po is called on the top level, but might
not be sophisticated enough if people call .po inside indentation-changing
contexts, but i haven't seen that in manual pages (yet :).
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sufficient for pages using po4a(1)
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Renaming a user-defined macro is very simple: just copy
the definition to the new name and delete the old name.
Renaming high-level macros is a bit tricky: use a dedicated
key-value-table, with non-standard names as keys and standard
names as values. When a macro is found that is not user-defined,
look it up in the "renamed" table and translate it back to the
standard name before passing it on to the high-level parsers.
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The Tcl/Tk manual pages use this extensively.
Delete the TERM_MAXMARGIN hack, it breaks .mc inside .nf;
instead, implement a proper TERMP_BRNEVER flag.
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(escape character control), touching nothing after the preprocessing
stage and keeping even the state variable local to the preprocessor.
Since the escape character is also used for line continuation, this
requires pulling the implementation of line continuation from the
input reader to the preprocessor, which also considerably shortens
the code required for that.
When the escape character is changed, simply let the preprocessor
replace bare by escaped backslashes and instances of the non-standard
escape character with bare backslashes - that's all we need.
Oh, and if anybody dares to use these requests in OpenBSD manuals,
sending a medium-sized pack of axe-murderers after them might be a
worthwhile part of the punishment, but probably insuffient on its own.
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A full implementation would require access to output device properties
and state variables (both only available after the main parser has
finalized the parse tree) before numerical expansions in the roff
preprocessor (i.e., before the main parser is even started).
Not trying to pull that stunt right now because the static-width
implementation committed here is sufficient for tcl-style manual pages
and already more complicated than i would have suspected.
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Good enough to cope with the average DocBook insanity.
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Needed by about four dozen ports (thanks to naddy@ for the research).
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specify request arguments and supporting tag searching in less(1).
Improve some entries and document .ta.
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If is not a macro but a low-level roff request
and not recommended for use in manual pages.
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found by Michael <Stapelberg at debian dot org> with Lintian
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Actually using these is very stupid because they are groff extensions
and other roff(7) implementations typically print unintended characters
at the places where they are used.
Nevertheless, some manuals contain them, for example ocserv(8).
Problem reported by Kurt Jaeger <pi at FreeBSD>.
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of the current user-defined macro.
This is another missing feature required for ocserv(8).
Problem reported by Kurt Jaeger <pi at FreeBSD>.
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Missing feature found by Markus <Waldeck at gmx dot de>
in Debian's bash(1) manual page.
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implementation. As a side effect, minus ten lines of code.
As another side effect, this also fixes the assertion failure that
used to be triggered by "\z\o'ab'c" at the beginning of an output
line, found by jsg@ with afl (test case 022/Apr27).
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For .it, ignore scaling units in roff_getnum().
Inside parentheses, skip whitespace after a sign in roff_getnum().
Parse and ignore unary plus in roff_getnum().
As a bonus, get rid of the only call to mandoc_strntoi() in roff.c.
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Remove lots of lies, dozens of irrelevant implementation details,
and all references to groff versions older than 1.17. Move relevant
information to the pages where it belongs, and out of mandoc(1) in
particular. Add some missing general remarks to roff(7), where it
fits the character and purpose of the page much better.
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is sometimes harmless, it often causes seriously ugly output,
so flag these requests as unsupported rather than ignoring them.
Discussed with naddy@.
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scaling units, and some manuals (e.g. in devel/grcs) actually use that,
so let's support it. Missing feature reported by naddy@.
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This is of some relevance because the pod2man(1) preamble abuses it
for the icelandic letter Thorn, instead of simply using \(TP and \(Tp.
Missing feature found by sthen@ in DateTime::Locale::is_IS(3p).
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