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Re: [Heirloom] Using the Symbola font in Heirloom troff


From: Richard Morse
Subject: Re: [Heirloom] Using the Symbola font in Heirloom troff
Date: Tue, 4 Aug 2020 14:47:30 -0400

According to the Heirloom Troff manual, I think that you cannot just insert 
Unicode characters (although maybe if your LC* environment variables are set 
correctly, you can?). It says:

> Both nroff and troff allow references to specific Unicode characters with the 
> \U'X' escape sequence;
> it causes the character at position U+X to be printed (X is a hexadecimal 
> number). For troff,
> it is required that this character is available in one of the fonts mounted 
> at this point.
> As an example, \U'20AC' prints the Euro character €. When register .g is set 
> to 1 Unicode
> characters can also be accessed with \[uXXXX] where XXXX is a four digit 
> hexadecimal number.

So I think you would need to use `\U'1F0A1'` for the character to show up?

Ricky


> On Aug 4, 2020, at 12:28 PM, T. Kurt Bond <tkurtbond@gmail.com> wrote:
> 
> (The heirloom-doctools README.md
> <https://github.com/n-t-roff/heirloom-doctools/blob/master/README.md> says
> to ask Heirloom doctools questions on this list.)
> 
> I'd like to use the Symbola font in Heirloom troff.   I tried the following:
> 
> .do xflag 3
> .\" fp 5 Optima Optima-Regular ttf
> .fp 5 Symbola Symbola otf
> .LP
> Here is some normal text.
> .\" PLAYING CARD ACE OF SPACES is Unicode 0x1F0A1
> .ft Symbola
> 🂡 And some normal text. ❊
> .ft P
> More normal text.
> 
> That's a literal PLAYING CARD ACE OF SPADES Unicode character at the start
> of the line between the two .ft requests.  That character does not show up
> in the troff output, even through the EIGHT TEARDROP-SPOKED PROPELLER
> ASTERISK Unicode character at the end of the line *does* show up,
> as CPSuni274A where the CPS<name> outputs the character of that name.  The
> Symbola font is embedded in the PDF output (created from the PostScript
> output), and the text "And some normal text" and the EIGHT TEARDROP-SPOKED
> PROPELLER ASTERISK Unicode character are in the Symbola font in the troff
> output.
> 
> However, if I manually add a CPSuni1F0A1 to the troff output, *that* character
> *does* show up.
> 
> Any ideas as to why the literal PLAYING CARD ACE OF SPADES Unicode
> character in the document source is being ignored and not written to the
> troff output?
> 
> I actually have a document that needs to use the PLAYING CARD ACE OF SPADES
> Unicode character.  The ultimate goal is to have the Symbola font used as a
> fallback font, which should happen automatically in Heirloom troff, since
> it searches all the fonts when a font is missing a character, but I made
> the example use the Symbola font directly because that shows the problem
> directly.
> 
> -- 
> T. Kurt Bond, tkurtbond@gmail.com, https://tkurtbond.github.io




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