feat: add a k repl formatter

Beacon/Utilities/Utils.swift

@@ -65,7 +65,7 @@ func e(input: String) -> String {
 func ke(input: String) -> String {
     var input = input.replacingOccurrences(of: "\\", with: #"\\"#)
     input = input.replacingOccurrences(of: "\"", with: #"\""#)
-    input = ".[{`0:`k@.\"\(input)\"};[];{`0:(,\"Error: \"),(-2_\"\n\"\\x)}]"
+    input = ".[{line `k@.\"\(input)\"};[];{`0:(,\"Error: \"),(-2_\"\n\"\\x)}]"
     return runCmd(kCmd, input)
 }
 

Beacon/Views/ContentView.swift

@@ -132,5 +132,30 @@ struct ContentView: View {
         viewModel.load(Buffers.get())
         kinit()
         repl_init()
+        // below is adapted from https://codeberg.org/ngn/k/src/branch/master/repl.k
+        let k_formatter = """
+(opn;sem;cls):"(;)"
+lines:cols:80
+upd:(lines;cols)
+lim:{(x<#y)(x#)/y}
+dd:{(x<#y)(,[;".."](x-2)#)/y}
+fmt:{upd[];$[(::)~x;"";(1<#x)&|/`m`M`A=@x;mMA x;(dd[cols]`k@lim[cols]x),"\n"]}
+fmtx:{$[(::)~x;"";`k[x],"\n"]}
+mMA:{(P;f;q):((,"!/+(";dct;,")");(("+![";" +(");tbl;")]");(,,"(";lst;,")"))`m`M`A?t:@x
+ w:cols-#*P;u:w-#q;h:lines-2
+ x:$[h<(`M=t)+#x;,[;,".."](h-1)#f[w;u;h#x];f[w;u;x]]
+ ,[;"\n"]@"\n"/@[;-1+#x;,;q]P[!#x],'x}
+lst:{[w;u;x](((-1+#x)#w),u)dd'`k'lim[cols]'x}
+dct:{[w;u;x]k:(|/#'k)$k:`k'!x;par'(((-1+#x)#w-3),u-3)dd'sem/'+(k;`k'.x)}
+tbl:{[w;u;x]h:`k'!x;d:`k''.x;W:(#'h)|/'#''d
+ r:,$[`S~@!x;dd[w](""opn),(""sem)/;par@dd[w-2]@sem/]W$'h
+ r,par'dd[w-2]'sem/'+@[W;&~^`i`d?_@'.x;-:]$'}
+cell:{$[|/`i`d=@y;-x;x]$z}
+par:{opn,x,cls}
+line0:{c:{0x07~*-2#*x}{(l;r):x;(1:1;r,,(-2_l))}/(x;());"\n"/(*|c),,*c}
+line1:{$[#x;;:0];.[`1:(fmt;fmtx)[" "~*x]@.:;,x;{`0:`err[]}]}
+line:line1@line0@
+"""
+        let _ = runCmd(kCmd, k_formatter)
     }
 }