bug#41958: ps-print-buffer only knows about some fonts for MacOS Preview

["James P. Ascher" via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

I use ps-print to produce a PostScript file that I open in MacOS Preview to
double-check before printing.  I'd like to be able to use Hack as a font
rather than Courier.  Right now, Hack isn't recognized along with other
installed fonts, but I can't tell why some work and some don't.


Following the directions in ps-print.el, I tried to add Hack as
a Courier replacement.  I removed the comment and updated this line:

3 cm 20 cm moveto  10/Hack-Regular ReportFontInfo  showpage

Opening the resulting PostScript file in Preview.app gives this error:


PostScript Conversion Warning

Converting the PostScript file "temp.ps" produced the following
warnings: "Hack-Regular" not found, using Courier.


Similarly for "Hack" or "Hack-Italic."  In trying to debug the problem,
I checked fonts on my laptop at random to see if any worked.
AmericanTypewriter-Light works fine while AmericanTypewriter gives the
same error, even though both are in the same directory and seem to be
otherwise similar.  I'll paste the details of those two fonts below, but
I think there must be something in the PostScript generated by ps-print
that doesn't load all the fonts.  Pages, for example, generates
a PostScript file with Hack, but it looks remarkably different than what
ps-print generates--so I'm not entirely sure what to compare.

I'm not sure what to do next to debug this: my PostScript knowledge is
minimal.  Does anyone have a sense of how to figure this out?


Emacs 26.3
MacOS 10.15.5
ps-print.el 7.3.5

Font details from Font Book:

WORKING as "AmericanTypewriter-Light":

PostScript name	AmericanTypewriter-Light
	Full name	American Typewriter Light
	Family	American Typewriter
	Style	Light
	Kind	TrueType
	Language	Afrikaans, Albanian, Asturian, Asu, Azerbaijani, Basque, Belarusian, Bemba, Bena, Bosnian, Breton, Bulgarian, Catalan, Chiga, Colognian, Cornish, Croatian, Czech, Danish, Dutch, Embu, English, Esperanto, Estonian, Faroese, Filipino, Finnish, French, Friulian, Galician, Ganda, German, Greek, Gusii, Hawaiian, Hungarian, Icelandic, Igbo, Inari Sami, Indonesian, Irish, Italian, Jola-Fonyi, Kabuverdianu, Kalaallisut, Kalenjin, Kamba, Kazakh, Kikuyu, Kinyarwanda, Lakota, Latvian, Lithuanian, Lower Sorbian, Luo, Luxembourgish, Luyia, Macedonian, Machame, Makhuwa-Meetto, Makonde, Malagasy, Malay, Maltese, Manx, Meru, Meta=CA=BC, Mongolian, Morisyen, North Ndebele, Northern Sami, Norwegian Bokm=C3=A5l, Norwegian Nynorsk, Nyankole, Oromo, Ossetic, Polish, Portuguese, Quechua, Romanian, Romansh, Rombo, Rundi, Russian, Rwa, Samburu, Sango, Sangu, Scottish Gaelic, Sena, Serbian, Shambala, Shona, Slovak, Slovenian, Soga, Somali, Spanish, Swahili, Swedish, Swiss German, Taita, Tajik, Teso, Tongan, Turkish, Turkmen, Ukrainian, Upper Sorbian, Uzbek, Vietnamese, Vunjo, Walser, Welsh, Western Frisian, Yoruba, Zulu
	Script	Cyrillic, Greek, Latin, Tagalog
	Version	13.0d1e4
	Location	/System/Library/Fonts/Supplemental/AmericanTypewriter.ttc
	Unique name	American Typewriter Light; 13.0d1e4; 2017-06-07
	Copyright	Digitized data (c) Copyright 1997 E+F Designstudios. ITC American Typewriter is a registered trademark of International Typeface Corporation.
	Trademark	ITC American Typewriter is a registered trademark of International Typeface Corporation.
	Enabled	Yes
	Duplicate	No
	Copy protected	No
	Glyph count	1,195

GIVES ERROR as "AmericanTypewriter":

PostScript name	AmericanTypewriter
	Full name	American Typewriter
	Family	American Typewriter
	Style	Regular
	Kind	TrueType
	Language	Afrikaans, Albanian, Asturian, Asu, Azerbaijani, Basque, Belarusian, Bemba, Bena, Bosnian, Breton, Bulgarian, Catalan, Chiga, Colognian, Cornish, Croatian, Czech, Danish, Dutch, Embu, English, Esperanto, Estonian, Faroese, Filipino, Finnish, French, Friulian, Galician, Ganda, German, Greek, Gusii, Hawaiian, Hungarian, Icelandic, Igbo, Inari Sami, Indonesian, Irish, Italian, Jola-Fonyi, Kabuverdianu, Kalaallisut, Kalenjin, Kamba, Kazakh, Kikuyu, Kinyarwanda, Lakota, Latvian, Lithuanian, Lower Sorbian, Luo, Luxembourgish, Luyia, Macedonian, Machame, Makhuwa-Meetto, Makonde, Malagasy, Malay, Maltese, Manx, Meru, Meta=CA=BC, Mongolian, Morisyen, North Ndebele, Northern Sami, Norwegian Bokm=C3=A5l, Norwegian Nynorsk, Nyankole, Oromo, Ossetic, Polish, Portuguese, Quechua, Romanian, Romansh, Rombo, Rundi, Russian, Rwa, Samburu, Sango, Sangu, Scottish Gaelic, Sena, Serbian, Shambala, Snhona, Slovak, Slovenian, Soga, Somali, Spanish, Swahili, Swedish, Swiss German, Taita, Tajik, Teso, Tongan, Turkish, Turkmen, Ukrainian, Upper Sorbian, Uzbek, Vietnamese, Vunjo, Walser, Welsh, Western Frisian, Yoruba, Zulu
	Script	Cyrillic, Greek, Latin, Tagalog
	Version	13.0d1e4
	Location	/System/Library/Fonts/Supplemental/AmericanTypewriter.ttc
	Unique name	American Typewriter; 13.0d1e4; 2017-06-07
	Copyright	Digitized data (c) Copyright 1997 E+F Designstudios. ITC American Typewriter is a registered trademark of International Typeface Corporation.
	Trademark	ITC American Typewriter is a registered trademark of International Typeface Corporation.
	Enabled	Yes
	Duplicate	No
	Copy protected	No
	Glyph count	1,195


Respectfully submitted,
-James

--
James P. Ascher
Doctoral Student, English Department
University of Virginia