Local itk-vtk-viewer

It is ready to install the itk-viewer in case it is not installed in qim https://www.notion.so/qim-dtu/Improve-CLI-viz-f4254522fa1e4159b8ce6d9206793b13

qim3d/viz/itk_vtk_viewer/helpers.py

 from pathlib import Path
 import os
+import platform
 
 import qim3d
 
 class NotInstalledError(Exception): pass
 
+SOURCE_FNM = "fnm env --use-on-cd | Out-String | Invoke-Expression;"
+
 def get_dir() -> Path:
     qim_dir = Path(qim3d.__file__).parents[0] #points to .../qim3d/qim3d/
     dir = qim_dir.joinpath("viz/itk_vtk_viewer")
@@ -17,15 +20,34 @@ def get_nvm_dir(dir:Path = None) -> Path:
 def get_node_binaries_dir(nvm_dir:Path = None) -> Path:
     """
     Versions could change in time. This makes sure we use the newest one.
+
+    For windows we have to pass the argument nvm_dir and it is the itk-vtk_dir
     """
-    following_folder = "versions/node"
+    if platform.system() == "Linux":
+        following_folder = "versions/node"
+        binaries_folder = 'bin'
+    elif platform.system() == 'Windows':
+        following_folder = 'node-versions'
+        binaries_folder = 'installation'
+
     node_folder =  nvm_dir.joinpath(following_folder) if nvm_dir is not None else get_nvm_dir().joinpath(following_folder)
-    l = sorted(os.listdir(node_folder))
+    try:
+        l = sorted(os.listdir(node_folder))
+    except FileNotFoundError:
+        raise NotInstalledError
+
     for name in l[::-1]:
         path = node_folder.joinpath(name)
         if os.path.isdir(path):
-            return path.joinpath("bin")
-
+            return path.joinpath(binaries_folder)
+    
 def get_viewer_dir(dir:Path = None) -> Path:
     following_folder = "viewer_app"
     return dir.joinpath(following_folder) if dir is not None else get_dir().joinpath(following_folder)
+
+def get_viewer_binaries(viewer_dir:Path = None) -> Path:
+    following_folder1 = 'node_modules'
+    following_folder2 = '.bin'
+    if viewer_dir is None:
+        viewer_dir = get_viewer_dir()
+    return viewer_dir.joinpath(following_folder1).joinpath(following_folder2)
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