Stop trying to deduce whether the document is being formatted for a
typesetter (a device that can use proportional fonts) or a terminal (a
device that generally can't) by asking the formatter to measure
formatted texts. Instead, use the built-in `n` and `t` conditions that
nroff and troff have supported for this purpose since 1976 at the
latest. All known troff implementations support these.
https://www.gnu.org/software/groff/manual/groff.html.node/Operators-in-Conditionals.html
These *roff control lines were ill-formed. `.fi` is a request to turn
on filling, not a closing bracket for an `if` request (*roff is not a
Bourne shell).
https://www.gnu.org/software/groff/manual/groff.html.node/Conditional-Blocks.html
Further, *roff generally does not accept more than one request per
input line. Exceptions to this rule are the control structuring
requests (`if`, `ie`, `el`, and in GNU troff, `while`, `do` and `nop`).
But here, only one (`do`-nested) request is governed by the `if` anyway.
* doc/Guidebook.mn: Remove workaround, in favor of...
* doc/tmac.n: ...setting automatic hyphenation mode appropriate to
hyphenation systems used by AT&T-descended troffs on the one hand
("suftab") and groff (TeX hyphenation patterns) on the other.
modify results of pull request #977 to target tmac.nh instead.
Guidebook update to trigger the process following pull request 977.
G. Branden Robinson