Added support for anaconda python under windows

docs/Usage.md

@@ -44,7 +44,7 @@ user> (require '[libpython-clj.python
                          python-type]])
 nil
 
-
+; Mac and Linux
 user> (initialize!)
 Jun 30, 2019 4:47:39 PM clojure.tools.logging$eval7369$fn__7372 invoke
 INFO: executing python initialize!
@@ -53,6 +53,17 @@ INFO: Library python3.6m found at [:system "python3.6m"]
 Jun 30, 2019 4:47:39 PM clojure.tools.logging$eval7369$fn__7372 invoke
 INFO: Reference thread starting
 :ok
+
+; Windows with Anaconda
+(initialize! ; Python executable
+             :python-executable "C:\\Users\\USER\\AppData\\Local\\Continuum\\anaconda3\\python.exe"
+             ; Python Library
+             :library-path "C:\\Users\\USER\\AppData\\Local\\Continuum\\anaconda3\\python37.dll"
+             ; Anacondas PATH environment to load native dlls of modules (numpy, etc.)
+             :windows-anaconda-activate-bat "C:\\Users\\USER\\AppData\\Local\\Continuum\\anaconda3\\Scripts\\activate.bat"
+             )
+...
+:ok
 ```
 
 This dynamically finds the python shared library and loads it using output from

src/libpython_clj/python.clj

@@ -4,6 +4,7 @@
             [libpython-clj.python.interpreter :as pyinterp]
             [libpython-clj.python.object :as pyobj]
             [libpython-clj.python.bridge :as pybridge]
+            [libpython-clj.python.windows :as win]
             [libpython-clj.jna :as libpy]
             ;;Protocol implementations purely for nd-ness
             [libpython-clj.python.np-array]
@@ -235,7 +236,8 @@
              library-path
              python-home
              no-io-redirect?
-             python-executable]}]
+             python-executable
+             windows-anaconda-activate-bat]}]
   (when-not @pyinterp/main-interpreter*
     (pyinterp/initialize! :program-name program-name
                           :library-path library-path
@@ -245,14 +247,16 @@
     (pyinterop/register-bridge-type!)
     (when-not no-io-redirect?
       (pyinterop/setup-std-writer #'*err* "stderr")
-      (pyinterop/setup-std-writer #'*out* "stdout")))
+      (pyinterop/setup-std-writer #'*out* "stdout"))
+    (if-not (nil? windows-anaconda-activate-bat)
+      (win/setup-windows-conda! windows-anaconda-activate-bat)))
   :ok)
 
 
 (defn ptr-refcnt
   [item]
   (-> (libpy/as-pyobj item)
-      (libpython_clj.jna.PyObject. )
+      (libpython_clj.jna.PyObject.)
       (.ob_refcnt)))
 
 

src/libpython_clj/python/interpreter.clj

@@ -1,5 +1,5 @@
 (ns libpython-clj.python.interpreter
-  (:require [libpython-clj.jna :as libpy ]
+  (:require [libpython-clj.jna :as libpy]
             [libpython-clj.jna.base :as libpy-base]
             [libpython-clj.python.gc :as pygc]
             [libpython-clj.python.logging
@@ -30,13 +30,13 @@
   (let [{:keys [out err exit]}
         (sh executable "-c" "import sys, json;
 print(json.dumps(
-{\"platform\":          sys.platform,
-  \"prefix\":           sys.prefix,
-  \"base_prefix\":      sys.base_prefix,
-  \"executable\":       sys.executable,
-  \"base_exec_prefix\": sys.base_exec_prefix,
-  \"exec_prefix\":      sys.exec_prefix,
-  \"version\":          list(sys.version_info)[:3]}))")]
+{'platform':          sys.platform,
+  'prefix':           sys.prefix,
+  'base_prefix':      sys.base_prefix,
+  'executable':       sys.executable,
+  'base_exec_prefix': sys.base_exec_prefix,
+  'exec_prefix':      sys.exec_prefix,
+  'version':          list(sys.version_info)[:3]}))")]
     (when (= 0 exit)
       (json/read-str out :key-fn keyword))))
 
@@ -93,7 +93,7 @@ print(json.dumps(
         ;;   ..: mac and windows are for sys.platform
         :linux   "libpython%s.%sm.so$"
         :mac     "libpython%s.%sm.dylib$"
-        :windows "python%s.%sm.dll$")
+        :win32   "python%s%s.dll$")
       major minor))))
 
 (defn python-library-paths
@@ -131,9 +131,9 @@ print(json.dumps(
   (let [executable "python3.7"
         system-info (python-system-info executable)
         pyregex (python-library-regex system-info)]
-    (python-library-paths system-info pyregex))
+    (python-library-paths system-info pyregex)))
   ;;=> ["/usr/lib/x86_64-linux-gnu/libpython3.7m.so" "/usr/lib/python3.7/config-3.7m-x86_64-linux-gnu/libpython3.7m.so"]
-  )
+
 
 (defn- ignore-shell-errors
   [& args]
@@ -179,8 +179,8 @@ print(json.dumps(
 ;;get the type of that item if we have seen it before.
 (defrecord Interpreter [
                         interpreter-state* ;;Thread state, per interpreter
-                        shared-state* ;;state shared among all interpreters
-                        ])
+                        shared-state*]) ;;state shared among all interpreters
+
 
 
 ;; Main interpreter booted up during initialize!
@@ -411,7 +411,7 @@ print(json.dumps(
              python-executable]
       :as options}]
   (when-not (main-interpreter)
-    (log-info (str "Executing python initialize with options:" options) )
+    (log-info (str "Executing python initialize with options:" options))
     (let [{:keys [python-home libname java-library-path-addendum] :as startup-info}
           (detect-startup-info options)
           library-names (cond

src/libpython_clj/python/windows.clj

@@ -0,0 +1,43 @@
+(ns libpython-clj.python.windows
+  (:require [libpython-clj.python.interop :refer [run-simple-string]]
+            [clojure.java.shell :refer [sh]]
+            [clojure.java.io :as io]
+            [clojure.string :as s]))
+
+(defn create-echo-path-bat! []
+  "Creates temporary file to extract condas PATH environment variable"
+  (let [tmp (java.io.File/createTempFile "echo-path" ".bat")]
+    (spit tmp "echo %PATH%")
+    (.toString tmp)))
+
+(defn delete-echo-path-bat! [tmp]
+  "Deletes temporary file"
+  (io/delete-file tmp))
+
+(defn- get-windows-anaconda-env-path [activate-bat echo-bat]
+  "Get anacondas windows PATH environment variable to load native dlls for numpy etc. like python with anaconda does."
+  (-> (sh "cmd.exe" "/K" (str activate-bat " & " echo-bat))
+      :out
+      (s/split #"\r\n")
+      reverse
+      (nth 2)))
+
+
+(defn- generate-python-set-env-path [path]
+  "Double quote windows path separator \\ -> \\\\"
+  (let [quoted (s/replace path "\\" "\\\\")]
+    (str
+      "import os;\n"
+      "path = '" quoted "';\n"
+      "os.environ['PATH'] = path;\n")))
+
+(defn setup-windows-conda! [windows-conda-activate-bat]
+  "Setup python PATH environment variable like in anaconda to be able to load native dlls for numpy etc. like anaconda does."
+  (let [echo-bat (create-echo-path-bat!)]
+    (->> (get-windows-anaconda-env-path
+           windows-conda-activate-bat
+           echo-bat)
+         generate-python-set-env-path
+         run-simple-string)
+    (delete-echo-path-bat! echo-bat)))
+