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* Surprisingly, every escape sequence can also be used as an argumentIngo Schwarze2022-06-081-1/+29
| | | | | | | 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.
* With the improved escape sequence parser, it becomes easy to also improveIngo Schwarze2022-06-051-1/+1
| | | | | | | | | 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.
* Messages of the -Wbase level now print STYLE:. Since thisIngo Schwarze2017-07-041-4/+1
| | | | | | | | 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.
* cope with changes in BASE messagesIngo Schwarze2017-06-251-2/+3
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* style message about missing RCS ids; inspired by mdoclintIngo Schwarze2017-06-171-0/+1
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* Style message about legacy man(7) date format in mdoc(7) documentsIngo Schwarze2017-06-111-0/+1
| | | | | and operating system dependent messages about missing or unexpected Mdocdate; inspired by mdoclint(1).
* Finally port the OpenBSD regression suite.Ingo Schwarze2017-02-081-0/+1
Both kristaps@ and wiz@ repeated asked for this, literally for years.