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inside \w arguments, and skip most other escape sequences when measuring
the output length in this way because most escape sequences contribute
little or nothing to text width: for example, consider font escapes in
terminal output.
This implementation is very rudimentary. In particular, it assumes that
every character has the same width. No attempt is made to detect
double-width or zero-width Unicode characters or to take dependencies on
output devices or fonts into account. These limitations are hard to
avoid because mandoc has to interpolate \w at the parsing stage when the
output device is not yet known. I really do not want the content of the
syntax tree to depend on the output device.
Feature requested by Paul <Eggert at cs dot ucla dot edu>, who also
submitted a patch, but i chose to commit this very different patch
with almost the same functionality.
His input was still very valuable because complete support for \w is
out of the question, and consequently, the main task is identifying
subsets of the feature that are needed for real-world manual pages
and can be supported without uprooting the whole forest.
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delimiter for an outer escape sequence, in which case the delimiting
escape sequence retains its syntax but usually ignores its argument
and loses its inherent effect. Add rudimentary support for this
syntax quirk in order to improve parsing compatibility with groff.
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diagnostics. Distinguish "incomplete escape sequence", "invalid special
character", and "unknown special character" from the generic "invalid
escape sequence", also promoting them from WARNING to ERROR because
incomplete escape sequences are severe syntax violations and because
encountering an invalid or unknown special character makes it likely
that part of the document content intended by the authors gets lost.
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causes horrible churn anyway, profit of the opportunity to stop
excessive testing, such that this is hopefully the last instance
of such churn. Consistently use OpenBSD RCS tags, blank .Os,
blank fourth .TH argument, and Mdocdate like everywhere else.
Use -Ios=OpenBSD for platform-independent predictable output.
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and operating system dependent messages about missing or unexpected
Mdocdate; inspired by mdoclint(1).
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Both kristaps@ and wiz@ repeated asked for this,
literally for years.
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