[Fontconfig] How do I fc-match font of some particular encoding?

[Yuri Kanivetsky]

Hi,

I was trying to make xterm use some particular font, namely Terminus. I
managed to do so with "font" X resource:

    xterm*font: -*-terminus-medium-r-*--20-*-*-*-*-*-iso10646-*

But I wonder if I could achieve the same result with "faceName" resource. I
tried it this way (according to tutorial at
http://keithp.com/~keithp/render/Xft.tutorial):

    xterm*faceName: Terminus:encoding=iso10646-1

But it chooses ter-112n.pcf.gz
(-xos4-terminus-medium-r-normal--12-120-72-72-c-60-iso8859-1) font. Or so
fc-match says. Surprisingly, fc-pattern says:

    $ fc-pattern Terminus:encoding=iso10646-1
    Pattern has 2 elts (size 16)
            family: "Terminus"(s)
            encoding: <unknown>(s)

Not sure what exactly this means. fc-query for the file I'd like it to use
outputs:

    $ fc-query /usr/share/fonts/misc/ter-x20n.pcf.gz
    Pattern has 20 elts (size 32)
            family: "Terminus"(s)
            style: "Regular"(s)
            slant: 0(i)(s)
            weight: 80(i)(s)
            width: 100(i)(s)
            pixelsize: 20(f)(s)
            spacing: 110(i)(s)
            foundry: "xos4"(s)
            antialias: False(s)
            file: "/usr/share/fonts/misc/ter-x20n.pcf.gz"(s)
            index: 0(i)(s)
            outline: False(s)
            scalable: False(s)
            charset:
            0000: ffffffff ffffffff ffffffff 7fffffff 00000000 ffffffff
ffffffff ffffffff
            0001: ffffffff ffffffff ffffffff ff3fffff 6005c040 00800000
00000000 00000000
            0002: 0f000000 008c0000 0b100000 00040000 00040000 38000000
3b0000c0 00000000
            0003: 0000104f 00000200 00000000 00000000 ffffd7f0 fffffffb
00007fff 00180000
            0004: ffffffff ffffffff ffffffff 00000000 3fff0000 0fcfcc3f
ffff0000 033ffffc
            001e: 00000000 00300000 00000000 00000000 00000000 33000000
00003c00 03000030
            0020: ffff07ff 560d0047 00000000 80000000 00000000 00005080
00000000 00000000
            0021: 0040c000 00000044 00000000 00000000 003f0000 00200100
003f0000 00000000
            0022: c6040568 00000780 00000100 00000033 00000000 00000000
00000000 00000000
            0023: 00010005 00000003 00000000 00000000 00000000 3c000000
00000000 00000000
            0024: 00003e00 00000010 00000000 00000000 00000000 00000000
00000000 00000000
            0025: ffffff0f ffffffff ffff0fff fff1ffff ffcfffff 10445001
03008c41 00000000
            0026: 00000000 1c000000 00000005 00000c69 00000000 00000000
00000000 00000000
            0027: 01980000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
            00e0: 00000000 00000000 00000000 00000000 00000000 000f0007
00000000 00000000
            00f6: 00000000 00000000 00000000 00000000 00000000 40000000
00000000 00000000
            00ff: 00000000 00000000 00000000 00000000 00000000 00000000
00000000 20000000
    (s)
            lang:
aa|af|av|ay|az-az|ba|bm|be|bg|bi|bin|br|bs|bua|ca|ce|ch|chm|co|cs|cv|da|de|el|en|eo|es|et|eu|fi|fj|fo|fr|fur|fy|gd|gl|gn|gv|haw|ho|hr|hu|ia|ig|id|ie|ik|io|is|it|kaa|ki|kk|kl|kum|kv|kw|ky|la|lb|lez|ln|lt|lv|mg|mh|mi|mk|mo|mt|nb|nds|nl|nn|no|nr|nso|ny|oc|om|os|pl|pt|rm|ro|ru|sah|se|sel|sh|sk|sl|sm|sma|smj|smn|so|sq|sr|ss|st|sv|sw|tg|tk|tl|tn|to|tr|ts|tt|tw|tyv|uk|uz|vo|vot|wa|wen|wo|xh|yap|zu|ak|an|crh|csb|fat|fil|hsb|ht|jv|kj|ku-tr|kwm|lg|li|mn-mn|ms|na|ng|pap-an|pap-aw|rn|rw|sc|sg|sn|su|ty|za(s)
            fontversion: 0(i)(s)
            fontformat: "PCF"(s)
            decorative: False(s)
            hash:
"sha256:5b0df9eaed92cca3d962b4aa612614718bfdbbafcc4b42240a28bf3faa3c80bd"(s)
            postscriptname: "Terminus"(s)

Does this mean I can't match this font by encoding? Is this possible for
any other font? You may answer here if you so wish:
http://unix.stackexchange.com/questions/179802/how-do-i-fc-match-font-of-some-particular-encoding

Regards,
Yuri
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