enso.nim: Next time don't get confused

tests/test.nim

@@ -1,5 +1,5 @@
 import enso
-import std/[strformat, sugar]
+import std/[os, strformat, sugar]
 
 proc unsafe_void(str: string) =
   echo str
@@ -8,7 +8,12 @@ proc unsafe_int(str: string): int =
   echo str
   result = 1
 
-func add_two(x: int): int = x + 2
+func check_file(name: string): IO[string] =
+  proc(): string =
+    if fileExists(name):
+      result = readFile(name)
+    else:
+      result = "Not found"
 
 func main() =
   run strput("Hello from Enso!")
@@ -20,15 +25,20 @@ func main() =
   out_void()
   run strput(fmt"{out_int()}")
 
+  let get_filename: IO[string] =
+    proc(): string =
+      let name: IO[string] = readstr(STDIN)
+      echo "Enter the file name:"
+      name()
+
   let
-    num_list:   IO[seq[int]] = to_IO @[1, 2, 3, 4, 5]
-    list_added: IO[seq[int]] = num_list.map(add_two)
+    nested: IO[IO[string]] = get_filename.map(check_file)
+    joined: IO[string]     = nested.join
 
-  run strput(fmt"{list_added()}")
+  run strput(joined())
 
-  run strput("Enter a string")
-  let read: IO[string] = readstr(STDIN)
-  run strput(read())
+  let flat: IO[string] = get_filename.flatmap(check_file)
+  run strput(flat())
 
 when isMainModule:
   main()