Allow using a different interpreter through pythonic-interpreter var (#13)

Author: aiguofer

README.markdown

@@ -133,3 +133,11 @@ directory.
 ((python . ((pythonic-docker-compose-filename . "local.yml")
             (pythonic-docker-compose-service-name . "web"))))
 ```
+
+You can change the interpreter that pythonic uses. This is especially useful when you have set your `python-shell-interpreter` to something like `jupyter-console`. By default, it'll use `python-shell-interpreter`.
+
+To change it:
+
+```lisp
+(setq pythonic-interpreter "python")
+```

pythonic.el

@@ -251,16 +251,20 @@ print(json.dumps(yaml.safe_load(open(sys.argv[-1], 'r'))))
 
 ;;; Processes.
 
+(defvar pythonic-interpreter python-shell-interpreter
+  "Interpreter to use for pythonic process calls.")
+
 (cl-defun pythonic-call-process (&key file buffer display args cwd)
   "Pythonic wrapper around `call-process'.
 
 FILE is the input file. BUFFER is the output destination. DISPLAY
 specifies to redisplay BUFFER on new output. ARGS is the list of
+
 arguments passed to `call-process'. CWD will be working directory
 for running process."
   (let ((default-directory (pythonic-aliased-path (or cwd default-directory))))
     (python-shell-with-environment
-      (apply 'process-file python-shell-interpreter file buffer display args))))
+      (apply 'process-file pythonic-interpreter file buffer display args))))
 
 (cl-defun pythonic-start-process (&key process buffer args cwd filter sentinel (query-on-exit t))
   "Pythonic wrapper around `start-process'.
@@ -274,7 +278,7 @@ function if necessary.  QUERY-ON-EXIT will be corresponding
 process flag."
   (let ((default-directory (pythonic-aliased-path (or cwd default-directory))))
     (python-shell-with-environment
-      (let ((process (apply 'start-file-process process buffer python-shell-interpreter args)))
+      (let ((process (apply 'start-file-process process buffer pythonic-interpreter args)))
         (when filter
           (set-process-filter process filter))
         (when sentinel