Update faust.nsi and pyfaust.demo to retrieve demo data folder in different...

Update faust.nsi and pyfaust.demo to retrieve demo data folder in different situations: install from nsis package, install from pip package on windows.

The pip windows package is coming next.

misc/nsis/faust.nsi

@@ -122,6 +122,14 @@ Section "" ; no component so name not needed
   File @PROJECT_BINARY_DIR@\wrapper\python\*pyd
   File @PROJECT_BINARY_DIR@\wrapper\python\*pxd
 
+  ;add data path in __init__.py
+  FileOpen $1 "$2\pyfaust\__init__.py" a
+  ; go at the end of file (but with append mode is that necessary ?)
+  FileSeek $1 0 END
+  ; add the install path
+  FileWrite $1 "$\r$\n_NSI_INSTALL_PATH='$INSTDIR'"
+  FileClose $1
+
   ; post install matfaust auto-setup
   !include "FileFunc.nsh" ; for Locate
   !include "WordFunc.nsh" ; for WordFind

wrapper/python/pyfaust/demo.py

@@ -10,7 +10,16 @@ DEFT_FIG_DIR = 'pyfaust_demo_figures'
 def get_data_dirpath():
     from pkg_resources import resource_filename
     import os.path
+    from os import sep
     path = resource_filename(__name__, 'data')
+    if (sys.platform == 'win32' and not os.path.exists(path)):
+        from pyfaust import _NSI_INSTALL_PATH
+        # in windows nsis based installation the data can be anywhere
+        # users choose to install faust
+        # the nsi installer is responsible to set this const var
+        # at installation stage
+        # in this case, matlab is inst so point to its data dir
+        path = _NSI_INSTALL_PATH+sep+'matlab'+sep+'data'
     if(not os.path.exists(path)):
         # fallback to matlab wrapper data
         # it will not help if we are from pip pkg
@@ -1188,5 +1197,3 @@ if sys.platform == 'win32':
 else:
     timer = time
 
-
-