Use cross-platform relative paths in ``easy-install.pth`` when doing

``develop`` and the source directory is a subdirectory of the installation
target directory.
(backport from trunk)

--HG--
branch : setuptools-0.6
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/branches/setuptools-0.6%4052047

setuptools.txt

@@ -2612,6 +2612,10 @@ Release Notes/Change History
 
  * Fix problem with empty revision numbers in Subversion 1.4 ``entries`` files
 
+ * Use cross-platform relative paths in ``easy-install.pth`` when doing
+   ``develop`` and the source directory is a subdirectory of the installation
+   target directory.
+
 0.6c3
  * Fixed breakages caused by Subversion 1.4's new "working copy" format
 

setuptools/command/easy_install.py

@@ -1393,9 +1393,19 @@ class PthDistributions(Environment):
 
 
     def make_relative(self,path):
-        if normalize_path(os.path.dirname(path))==self.basedir:
-            return os.path.join(os.curdir, os.path.basename(path))
-        return path
+        npath, last = os.path.split(normalize_path(path))
+        baselen = len(self.basedir)
+        parts = [last]
+        sep = os.altsep=='/' and '/' or os.sep
+        while len(npath)>=baselen:
+            if npath==self.basedir:
+                parts.append(os.curdir)
+                parts.reverse()
+                return sep.join(parts)
+            npath, last = os.path.split(npath)
+            parts.append(last)
+        else:
+            return path
 
 
 def get_script_header(script_text, executable=sys_executable):
@@ -1420,6 +1430,9 @@ def get_script_header(script_text, executable=sys_executable):
         hdr = "#!%(executable)s%(options)s\n" % locals()
     return hdr
 
+
+
+
 def auto_chmod(func, arg, exc):
     if func is os.remove and os.name=='nt':
         os.chmod(arg, stat.S_IWRITE)
@@ -1452,6 +1465,15 @@ def is_python(text, filename='<string>'):
     else:
         return True
 
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 def is_python_script(script_text, filename):
     """Is this text, as a whole, a Python script? (as opposed to shell/bat/etc.
     """
@@ -1473,6 +1495,25 @@ def is_python_script(script_text, filename):
 
     return False    # Not any Python I can recognize
 
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 def get_script_args(dist, executable=sys_executable):
     """Yield write_script() argument tuples for a distribution's entrypoints"""