[heirloom] typesetting unicode characters

[Fernando]

Greetings,

I am typesetting an old textbook on latin from Project
Gutenberg which uses latin scripts such as an a with a
macron which has u+0101. According to the Groff 
online documentation[1] and this stackexchange board[2],
one can type unicode characters in the form of 
\[uxxxx]. So in this case, one could typset the 
lowercase a with macron with \[u0101]. This, however,
did not print the character in the postscript document[3],
and I can't tell if was in the troff dvi but I have 
uploaded the source here[4]. My next best guess was to 
check if the font supported such characters. Using
``
fc-match -s -f '%{file}\n' ':charset=0101'
``
I found that DejaVuSans and LinLibertine_R did support this
character. I was able to double check this with this 
site that displays fonts that support that character[5].
Perhaps my understanding of how to type unicode characters 
is incorrect. Or there is something wrong with the fonts I
have tried (in which case, I would have no problem switching
to another one). It is also possible that unicode characters 
are typeset differently in heirloom troff than in groff. I 
could not find anything that shows how to do unicode in
heirloom troff so I just assumed it was the same as in
groff. Any help would be appreciated.

[1] https://www.gnu.org/software/groff/manual/groff.html.node/Using-Symbols.html
[2] 
https://unix.stackexchange.com/questions/648352/are-%E2%88%88-and-%E2%84%9D-symbols-available-in-eqn-roff
[3] https://fortq.org/paste/unicode.ps
[4] https://fortq.org/paste/unicode.ms
[5] https://www.fileformat.info/info/unicode/char/0101/fontsupport.htm

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