use try/case instead of idx/switch

uash.ua

@@ -9,10 +9,8 @@
   ]
   ColorCode ↚ ˜⊂"\x1b[0m" ⊂$"\x1b[1;3_m"
   C ↚ (
-    ⨂{"truecolor"} □&var"COLORTERM"
-    ⨬(ColorCode get ⊙COLORS
-    | ◌
-    )
+    ⍣(⍩(ColorCode get ⊙COLORS) °"truecolor" &var"COLORTERM"
+    | ∘)
   )
 
   PS₁ ← &pf ⊂(C"blue" Pretty)(°&cd C"green" " λ ")
@@ -21,17 +19,15 @@
 ┌─╴Commands
   # ? {"cd" ...}
   CD ← (
-    ⨂[0 1]⊸⧻ ↘1
-    ⨬(&cd&var"HOME"
-    | ⍣&cd(&ep"cd: invalid path") ⊢
+    ⍣(⍩(&cd&var"HOME") °0⧻↘1
+    | ⍩(⍣&cd(&ep"cd: invalid path") ⊢) °1⊸⧻↘1
     | &ep"cd: too many arguments")
   )
 
   # ? {"exit" [code]}
-  Exit ← (
-    ⨂[0 1]⊸⧻ ↘1
-    ⨬(&exit 0
-    | &exit ⋕°□⊢
+  Exit ← |1.0 (
+    ⍣(⍩(&exit 0) °0⧻↘1
+    | ⍩(&exit ⋕°□⊢) °1⊸⧻↘1
     | &ep"exit: too many arguments")
   )