I switch fonts a lot, and most of the ones I use have ligatures. My primary editor is Emacs. Is there some kind of mode to globally enable ligatures for all fonts?
In most of the solutions I have seen, you need to write a function specific to every font, or install a premade mode through one of Emacs' package managers. The problem I have is that each of the functions I found are long. Here is an example of JetBrains Mono:
(defconst jetbrains-ligature-mode--ligatures
'("-->" "//" "/**" "/*" "*/" "<!--" ":=" "->>" "<<-" "->" "<-"
"<=>" "==" "!=" "<=" ">=" "=:=" "!==" "&&" "||" "..." ".."
"|||" "///" "&&&" "===" "++" "--" "=>" "|>" "<|" "||>" "<||"
"|||>" "<|||" ">>" "<<" "::=" "|]" "[|" "{|" "|}"
"[<" ">]" ":?>" ":?" "/=" "[||]" "!!" "?:" "?." "::"
"+++" "??" "###" "##" ":::" "####" ".?" "?=" "=!=" "<|>"
"<:" ":<" ":>" ">:" "<>" "***" ";;" "/==" ".=" ".-" "__"
"=/=" "<-<" "<<<" ">>>" "<=<" "<<=" "<==" "<==>" "==>" "=>>"
">=>" ">>=" ">>-" ">-" "<~>" "-<" "-<<" "=<<" "---" "<-|"
"<=|" "/\\" "\\/" "|=>" "|~>" "<~~" "<~" "~~" "~~>" "~>"
"<$>" "<$" "$>" "<+>" "<+" "+>" "<*>" "<*" "*>" "</>" "</" "/>"
"<->" "..<" "~=" "~-" "-~" "~@" "^=" "-|" "_|_" "|-" "||-"
"|=" "||=" "#{" "#[" "]#" "#(" "#?" "#_" "#_(" "#:" "#!" "#="
"&="))
(sort jetbrains-ligature-mode--ligatures (lambda (x y) (> (length x) (length y))))
(dolist (pat jetbrains-ligature-mode--ligatures)
(set-char-table-range composition-function-table
(aref pat 0)
(nconc (char-table-range composition-function-table (aref pat 0))
(list (vector (regexp-quote pat)
0
'compose-gstring-for-graphic)))))
It would be great if you could enable ligatures globally without focusing on a certain font.
Thanks!