added -d:nimNoArrayToString define to allow easier porting to 0.18

changelog.md

@@ -1,4 +1,4 @@
-## v0.18.0 - dd/mm/yyyy
+## v0.18.0 - 01/03/2018
 
 ### Changes affecting backwards compatibility
 
@@ -16,7 +16,9 @@
 
 - Arrays of char cannot be converted to ``cstring`` anymore, pointers to
   arrays of char can! This means ``$`` for arrays can finally exist
-  in ``system.nim`` and do the right thing.
+  in ``system.nim`` and do the right thing. This means ``$myArrayOfChar`` changed
+  its behaviour! Compile with ``-d:nimNoArrayToString`` to see where to fix your
+  code.
 
 - `reExtended` is no longer default for the `re` constructor in the `re`
   module.

lib/pure/parseopt.nim

@@ -78,7 +78,7 @@ when declared(os.paramCount):
   # we cannot provide this for NimRtl creation on Posix, because we can't
   # access the command line arguments then!
 
-  proc initOptParser*(cmdline = ""): OptParser =
+  proc initOptParser*(cmdline = ""): OptParser {.rtl, extern: "npo$1String".} =
     ## inits the option parser. If ``cmdline == ""``, the real command line
     ## (as provided by the ``OS`` module) is taken.
     result.pos = 0
@@ -94,6 +94,24 @@ when declared(os.paramCount):
     result.key = TaintedString""
     result.val = TaintedString""
 
+proc initOptParser*(cmdline: seq[string]): OptParser {.rtl, extern: "npo$1Seq".} =
+  ## inits the option parser. If ``cmdline.len == 0``, the real command line
+  ## (as provided by the ``OS`` module) is taken.
+  result.pos = 0
+  result.inShortState = false
+  result.cmd = ""
+  if cmdline.len != 0:
+    for i in 0..<cmdline.len:
+      result.cmd.add quote(cmdline[i])
+      result.cmd.add ' '
+  else:
+    for i in countup(1, paramCount()):
+      result.cmd.add quote(paramStr(i).string)
+      result.cmd.add ' '
+  result.kind = cmdEnd
+  result.key = TaintedString""
+  result.val = TaintedString""
+
 proc handleShortOption(p: var OptParser) =
   var i = p.pos
   p.kind = cmdShortOption

lib/system.nim

@@ -3428,10 +3428,10 @@ elif defined(JS):
   when defined(nimffi):
     include "system/sysio"
 
-
-proc `$`*[T, IDX](x: array[IDX, T]): string =
-  ## generic ``$`` operator for arrays that is lifted from the components
-  collectionToString(x, "[", ", ", "]")
+when not defined(nimNoArrayToString):
+  proc `$`*[T, IDX](x: array[IDX, T]): string =
+    ## generic ``$`` operator for arrays that is lifted from the components
+    collectionToString(x, "[", ", ", "]")
 
 proc quit*(errormsg: string, errorcode = QuitFailure) {.noReturn.} =
   ## a shorthand for ``echo(errormsg); quit(errorcode)``.