Re: CVS commit: src/share/tmac

[Steffen Nurpmeso <steffen%sdaoden.eu@localhost>]

Valery Ushakov wrote in <20191223222133.GJ24362%pony.stderr.spb.ru@localhost>:
 |On Mon, Dec 23, 2019 at 22:13:23 +0100, Steffen Nurpmeso wrote:
 |> Valeriy E. Ushakov wrote in <20191223201734.0E415FA98%cvs.NetBSD.org@localhost>:
 |>
 |>|Modified Files:
 |>| src/share/tmac: doc2html
 |>|
 |>|Log Message:
 |>|Fix if/else syntax in previous.
 |> 
 |> What was wrong with that?
 |> 
 |> .   ie 'utf8'\*[.T]' \
 |> .     ds mx:istty
 |> .   el .ie 'latin1'\*[.T]' \
 |> .     ds mx:istty
 |> .   el .ie 'ascii'\*[.T]' \
 |> .     ds mx:istty
 |> .   el .ie 'pdf'\*[.T]' \
 |> .     mx:dump-init-pdf
 |> .   el .ie 'html'\*[.T]' \
 |> .     mx:dump-init-html
 |> .   el \
 |> .     rm mx:gogogo
 |> 
 |> is perfectly valid roff code.
 |
 |Try running it with warnings (-ww), as the build process does.  You'll
 |get
 |
 |    warning: unbalanced .el request
 |
 |Consider
 |
 |  .ie     '\*(.T'ascii'  .ds html-charset US-ASCII
 |  .el .ie '\*(.T'latin1' .ds html-charset ISO-8859-1
 |  .el .ie '\*(.T'utf8'   .ds html-charset UTF-8
 |  .el .ab unsupported encoding \*(.T
 |
 |executed with -Tascii.
 |
 |Troff reads .ie and checks the condition.  The condition is true and
 |so the rest of the line is executed.  Then troff reads .el that
 |matches successful .ie, so the .el is discarded.
 |
 |Then it reads .el which is not matched with any .ie that troff has
 |seen.  It's usually silently discarded, but since we run with -ww we
 |get the warning about an unbalanced .el
 |
 |The the same happens again for the next .el, the number of warnings
 |depends on which .ie in the chain was successful (no warnings for
 |utf-8, 1 warning for latin1, two for ascii).

Interesting.  You are right.  Never encountered that, i have to
change some macros of mine!

A nice Christmas i wish!
Ciao from Germany,

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)