3 files changed, 25 insertions, 19 deletions
diff --git a/lib/pure/macros.nim b/lib/pure/macros.nim
index 5129cde1b..677469ed2 100755
--- a/lib/pure/macros.nim
+++ b/lib/pure/macros.nim
@@ -122,8 +122,11 @@ proc `!` *(s: string): TNimrodIdent {.magic: "StrToIdent".}
 proc `$`*(i: TNimrodIdent): string {.magic: "IdentToStr".}
   ## converts a Nimrod identifier to a string
 
-proc `==`* (a, b: TNimrodIdent): bool {.magic: "EqIdent".}
+proc `==`* (a, b: TNimrodIdent): bool {.magic: "EqIdent", noSideEffect.}
   ## compares two Nimrod identifiers
+
+proc `==`* (a, b: PNimrodNode): bool {.magic: "EqNimrodNode", noSideEffect.}
+  ## compares two Nimrod nodes
 
 proc len*(n: PNimrodNode): int {.magic: "NLen".}
   ## returns the number of children of `n`.
diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index a2a1830f7..c5d683975 100755
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -10,7 +10,6 @@
 ## This module contains basic operating system facilities like
 ## retrieving environment variables, reading command line arguments,
 ## working with directories, running shell commands, etc.
-## This module is -- like any other basic library -- platform independant.
 {.deadCodeElim: on.}
 
 {.push debugger: off.}
@@ -384,10 +383,13 @@ proc SplitPath*(path: string): tuple[head, tail: string] {.noSideEffect.} =
   ## Splits a directory into (head, tail), so that
   ## ``JoinPath(head, tail) == path``.
   ##
-  ## Example: After ``SplitPath("usr/local/bin", head, tail)``,
-  ## `head` is "usr/local" and `tail` is "bin".
-  ## Example: After ``SplitPath("usr/local/bin/", head, tail)``,
-  ## `head` is "usr/local/bin" and `tail` is "".
+  ## Examples: 
+  ## .. code-block:: nimrod
+  ##   SplitPath("usr/local/bin") -> ("usr/local", "bin")
+  ##   SplitPath("usr/local/bin/") -> ("usr/local/bin", "")
+  ##   SplitPath("bin") -> ("", "bin")
+  ##   SplitPath("/bin") -> ("", "bin")
+  ##   SplitPath("") -> ("", "")
   var
     sepPos = -1
   for i in countdown(len(path)-1, 0):
@@ -431,8 +433,9 @@ proc normExt(ext: string): string =
   else: result = extSep & ext
 
 proc searchExtPos(s: string): int =
+  # BUGFIX: do not search until 0! .DS_Store is no file extension!
   result = -1
-  for i in countdown(len(s)-1, 0):
+  for i in countdown(len(s)-1, 1):
     if s[i] == extsep:
       result = i
       break
@@ -447,10 +450,11 @@ proc splitFile*(path: string): tuple[dir, name, ext: string] {.noSideEffect.} =
   ## Example:
   ##
   ## .. code-block:: nimrod
-  ## var (dir, name, ext) = splitFile("usr/local/nimrodc.html")
-  ## assert dir == "usr/local"
-  ## assert name == "nimrodc"
-  ## assert ext == ".html"
+  ##   var (dir, name, ext) = splitFile("usr/local/nimrodc.html")
+  ##   assert dir == "usr/local"
+  ##   assert name == "nimrodc"
+  ##   assert ext == ".html"
+  ##
   ## If `path` has no extension, `ext` is the empty string.
   ## If `path` has no directory component, `dir` is the empty string.
   ## If `path` has no filename component, `name` and `ext` are empty strings.
@@ -461,7 +465,7 @@ proc splitFile*(path: string): tuple[dir, name, ext: string] {.noSideEffect.} =
     var dotPos = path.len
     for i in countdown(len(path)-1, 0):
       if path[i] == ExtSep:
-        if dotPos == path.len: dotPos = i
+        if dotPos == path.len and i > 0: dotPos = i
       elif path[i] in {dirsep, altsep}:
         sepPos = i
         break
@@ -877,9 +881,9 @@ iterator walkDirRec*(dir: string, filter={pcFile, pcDir}): string =
   ## filter                  meaning
   ## ---------------------   ---------------------------------------------
   ## ``pcFile``              yield real files
-  ## ``pcLinkToFile``        yield symbol links to files
+  ## ``pcLinkToFile``        yield symbolic links to files
   ## ``pcDir``               follow real directories
-  ## ``pcLinkToDir``         follow symbol links to directories
+  ## ``pcLinkToDir``         follow symbolic links to directories
   ## ---------------------   ---------------------------------------------
   ## 
   var stack = @[dir]
diff --git a/lib/pure/strutils.nim b/lib/pure/strutils.nim
index 25b495f10..d17c48740 100755
--- a/lib/pure/strutils.nim
+++ b/lib/pure/strutils.nim
@@ -169,15 +169,14 @@ iterator split*(s: string, seps: set[char] = Whitespace): string =
   ##     writeln(stdout, word)
   ##
   ## produces the same output.
-  var
-    first: int = 0
-    last: int = 0
+  var last = 0
   assert(not ('\0' in seps))
   while last < len(s):
     while s[last] in seps: inc(last)
-    first = last
+    var first = last
     while last < len(s) and s[last] not_in seps: inc(last) # BUGFIX!
-    yield copy(s, first, last-1)
+    if first <= last-1:
+      yield copy(s, first, last-1)
 
 iterator split*(s: string, sep: char): string =
   ## Splits the string `s` into substrings.