Add 'scheme' conceals

.vim/after/syntax/scheme.vim

@@ -0,0 +1,37 @@
+syntax keyword Statement define conceal cchar=≔
+
+syn keyword Operator not conceal cchar=¬
+syn keyword Operator and conceal cchar=∧
+syn keyword Operator or conceal cchar=∨
+
+syn keyword Operator mod  conceal cchar=%
+syn keyword Operator exp  conceal cchar=^
+syn keyword Operator sqrt conceal cchar=√
+
+syn keyword Operator quote conceal cchar='
+
+" Conceal greek letters
+syn keyword Operator alpha   conceal cchar=α
+syn keyword Operator beta    conceal cchar=β
+syn keyword Operator gamma   conceal cchar=γ
+syn keyword Operator delta   conceal cchar=δ
+syn keyword Operator epsilon conceal cchar=ε
+syn keyword Operator zeta    conceal cchar=ζ
+syn keyword Operator eta     conceal cchar=η
+syn keyword Operator theta   conceal cchar=θ
+syn keyword Operator iota    conceal cchar=ι
+syn keyword Operator kappa   conceal cchar=κ
+syn keyword Operator lambda  conceal cchar=λ
+syn keyword Operator mu      conceal cchar=μ
+syn keyword Operator nu      conceal cchar=ν
+syn keyword Operator xi      conceal cchar=ξ
+syn keyword Operator omicron conceal cchar=ο
+syn keyword Operator pi      conceal cchar=π
+syn keyword Operator rho     conceal cchar=ρ
+syn keyword Operator sigma   conceal cchar=σ
+syn keyword Operator tau     conceal cchar=τ
+syn keyword Operator upsilon conceal cchar=υ
+syn keyword Operator phi     conceal cchar=φ
+syn keyword Operator chi     conceal cchar=χ
+syn keyword Operator psi     conceal cchar=ψ
+syn keyword Operator omega   conceal cchar=ω