From 1b73cd41bf71a76800a4da3e8c35f18e83b264c9 Mon Sep 17 00:00:00 2001
From: Dominik Picheta <dominikpicheta@googlemail.com>
Date: Sun, 23 Aug 2015 21:57:45 +0100
Subject: [PATCH] Improves osproc.startProcess error message. Fixes #2183.

---
 lib/pure/osproc.nim | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/pure/osproc.nim b/lib/pure/osproc.nim
index add4bc0a84..671e69a495 100644
--- a/lib/pure/osproc.nim
+++ b/lib/pure/osproc.nim
@@ -468,7 +468,14 @@ when defined(Windows) and not defined(useNimRtl):
         fileClose(si.hStdError)
 
     if e != nil: dealloc(e)
-    if success == 0: raiseOSError(lastError, command)
+    if success == 0:
+      const errInvalidParameter = 87.int
+      const errFileNotFound = 2.int
+      if lastError.int in {errInvalidParameter, errFileNotFound}:
+        raiseOSError(lastError,
+            "Requested command not found: '$1'. OS error:" % command)
+      else:
+        raiseOSError(lastError, command)
     # Close the handle now so anyone waiting is woken:
     discard closeHandle(procInfo.hThread)
     result.fProcessHandle = procInfo.hProcess