Use a private virtualenv for dependencies

.gitignore

@@ -1,2 +1,4 @@
 __pycache__/
 README.html
+doc/tags
+venv

python3/ghost_install.py

@@ -3,6 +3,7 @@
 from os import path
 import os
 import vim
+import venv
 
 
 def install():
@@ -13,17 +14,25 @@ def isvim():
         req = "requirements_win.txt" if sys.platform == "win32" else \
             "requirements_posix.txt"
         reqFile = path.join(base, req)
+        venv_dir = path.join(base, "venv")
+
+        print("ghost: creating virtualenv at %s" % venv_dir)
+        venv.create(venv_dir, with_pip=True)
+
+        if sys.platform == "win32":
+            pip_exe = path.join(venv_dir, "Scripts", "pip.exe")
+        else:
+            pip_exe = path.join(venv_dir, "bin", "pip")
+
         print("ghost: installing dependencies from %s" % reqFile)
-        py3 = sys.executable
-        # on windows vim reports sys.executable as the path to gvim/vim
-        if isvim() and sys.platform == "win32":
-            py3 = path.normpath(path.join(os.__file__, "../..", "python.exe"))
-        out = subprocess.check_output([py3,
-                                       "-m", "pip", "install", "--user", "-r",
+        out = subprocess.check_output([pip_exe,
+                                       "install", "-r",
                                        reqFile], stderr=subprocess.STDOUT,
                                       shell=False)
         for l in out.decode().split(os.linesep):
             print("ghost: %s" % l)
         print("ghost: dependencies installed successfully")
     except subprocess.CalledProcessError as cpe:
         print("ghost: error installing dependencies: %s" % cpe)
+    except Exception as e:
+        print("ghost: error: %s" % e)

pythonx/ghost_wrapper.py

@@ -1,3 +1,20 @@
+import os
+import sys
+import site
+import glob
+
+# Inject virtualenv site-packages if it exists
+_plugin_root = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
+_venv_path = os.path.join(_plugin_root, 'venv')
+if os.path.exists(_venv_path):
+    if sys.platform == 'win32':
+        _site_packages = os.path.join(_venv_path, 'Lib', 'site-packages')
+    else:
+        _site_packages_matches = glob.glob(os.path.join(_venv_path, 'lib', 'python3.*', 'site-packages'))
+        _site_packages = _site_packages_matches[0] if _site_packages_matches else None
+    if _site_packages and os.path.exists(_site_packages):
+        site.addsitedir(_site_packages)
+
 from ghost import Ghost as _Ghost
 import vim
 

rplugin/python3/ghost.py

@@ -1,12 +1,27 @@
+import os
+import sys
+import site
+import glob
+
+# Inject virtualenv site-packages if it exists
+_plugin_root = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..', '..'))
+_venv_path = os.path.join(_plugin_root, 'venv')
+if os.path.exists(_venv_path):
+    if sys.platform == 'win32':
+        _site_packages = os.path.join(_venv_path, 'Lib', 'site-packages')
+    else:
+        _site_packages_matches = glob.glob(os.path.join(_venv_path, 'lib', 'python3.*', 'site-packages'))
+        _site_packages = _site_packages_matches[0] if _site_packages_matches else None
+    if _site_packages and os.path.exists(_site_packages):
+        site.addsitedir(_site_packages)
+
 import subprocess
 from http.server import HTTPServer, BaseHTTPRequestHandler
 from random import randint
 from threading import Thread
 from tempfile import mkstemp
 import logging
 import json
-import os
-import sys
 import platform
 from SimpleWebSocketServer import SimpleWebSocketServer, WebSocket
 try: