Add writeFile(string, openarray[byte])

std_shims/io.nim

@@ -0,0 +1,13 @@
+proc writeFile*(filename: string, content: openarray[byte]) =
+  ## Opens a file named `filename` for writing. Then writes the
+  ## `content` completely to the file and closes the file afterwards.
+  ## Raises an IO exception in case of an error.
+  var f: File
+  if open(f, filename, fmWrite):
+    try:
+      f.writeBuffer(unsafeAddr content[0], content.len)
+    finally:
+      close(f)
+  else:
+    raise newException(IOError, "cannot open: " & filename)
+