support for APL character overstrikes in en_US.UTF-8/Compose
geoff at dyalog.com
Tue Jan 3 07:28:20 PST 2012
I have proposed some additional compositions to support the APL programming language. See https://bugs.freedesktop.org/show_bug.cgi?id=44059
APL started with IBM golf ball terminals and has always had the concept of composed characters which were built with overstrikes. So ∇ overstruck | produced ⍒.
The additions proposed cover all of the overstrikes which can be produced by the variants of apl keyboards in xkb/sybols/apl which has just been updated by Sergey.
I have also provided support for the circled alphabet and the circled digits. Since the letter "o" had already been used with "c" and "r" for the copyright and registered symbols, I used the digit "0". I also coded the use of the "○". I have only coded these in one order the "0" or "○" have to come first.
For the actual APL characters I have coded both orders.
I could have worked my way through the whole "Mathematical Operators" and "Miscellaneous Technical" but I am not aware of the cost of an extra line in "Compose". I have only coded the characters that I am aware of being in use in extant APLs.
Is en_US.UTF-8/Compose.pre the only file I should be changing? Should I be creating an "apl" locale with its own Compose file that is then included in en_US.UTF-8/Compose?
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