WIP vcard 3.0 implementation.

src/vcard/private/util.nim

@@ -0,0 +1,20 @@
+import strutils
+
+func foldContentLine*(s: string): string =
+  result = ""
+  var rem = s
+  while rem.len > 75: # TODO: unicode multi-byte safe?
+    result &= rem[0..<75] & "\r\n "
+    rem = rem[75..^1]
+  result &= rem
+
+func unfoldContentLine*(s: string): string =
+  return s.multiReplace([("\r\n ", "")])
+
+template indexOfIt*(s, pred: untyped): int =
+  var result = -1
+  for idx, it {.inject.} in pairs(s):
+    if pred:
+      result = idx
+      break
+  result