New commands for setting matplotlib configuration.

See new functions `ein:pytools-set-figure-dpi',
`ein:pytools-set-matplotlib-parameter'. Added some tests as well.

features/ob-ein.feature

@@ -115,7 +115,7 @@ Scenario: Specific port, portless localhost refers to same, concurrent execution
 @org @complete @skip-travis
 Scenario: Completion in an anonymous source block
   Given I set "ein:completion-backend" to eval "(quote ein:use-company-backend)"
-  Given I eval "(global-company-mode +1)"
+  Given I eval (global-company-mode +1)
   Given I stop the server
   When I open temp file "complete.org"
   And I call "org-mode"

features/step-definitions/ein-steps.el

@@ -425,7 +425,7 @@
       (lambda (variable value)
         (set (intern variable) (eval (car (read-from-string value))))))
 
-(When "^I eval \"\\(.+\\)\"$"
+(When "^I eval \\(.+\\)$"
       (lambda (expr)
         (eval (car (read-from-string expr)))))
 

lisp/ein-pytools.el

@@ -31,6 +31,7 @@
 
 (require 'ein-kernel)
 (require 'ein-notebook)
+(require 'ein-shared-output)
 
 (defun ein:goto-file (filename lineno &optional other-window)
   "Jump to file FILEAME at line LINENO.
@@ -410,9 +411,40 @@ Currently EIN/IPython supports exporting to the following formats:
   "Set the default figure size for matplotlib figures. Works by setting `rcParams['figure.figsize']`."
   (interactive "nWidth: \nnHeight: ")
   (ein:shared-output-eval-string (ein:get-kernel)
-                                 (format "__ein_set_figure_size(%s,%s)" width height)
+                                 (format "__ein_set_figure_size('[%s, %s]')" width height)
                                  nil))
 
+(defun ein:pytools-set-figure-dpi (dpi)
+  "Set the default figure dpi for matplotlib figures. Works by setting `rcParams['figure.figsize']`."
+  (interactive "nFigure DPI: ")
+  (ein:shared-output-eval-string (ein:get-kernel)
+                                 (format "__ein_set_figure_dpi('%s')" dpi)
+                                 nil))
+
+(defun ein:pytools-set-matplotlib-parameter (param value)
+  "Generically set any matplotlib parameter exposed in the matplotlib.pyplot.rcParams variable. Value is evaluated as a Python expression, so be careful of side effects."
+  (interactive
+   (list (completing-read "Parameter: " (ein:pytools--get-matplotlib-params) nil t)
+         (read-string "Value: " nil)))
+  (let* ((split (cl-position ?. param))
+         (family (cl-subseq param 0 split))
+         (setting (cl-subseq param (1+ split))))
+    (ein:shared-output-eval-string (ein:get-kernel)
+                                   (format "__ein_set_matplotlib_param('%s', '%s', '%s')" family setting value)
+                                   nil)))
+
+(defun ein:pytools--get-matplotlib-params ()
+  (ein:shared-output-eval-string (ein:get-kernel)
+                                 (format "__ein_get_matplotlib_params()")
+                                 nil)
+  (with-current-buffer (ein:shared-output-create-buffer)
+    (ein:wait-until #'(lambda ()
+                       (slot-value (slot-value *ein:shared-output* :cell) :outputs))
+                    nil
+                    5.0)
+    (let ((outputs (first (slot-value (slot-value *ein:shared-output* :cell) :outputs))))
+      (ein:json-read-from-string (plist-get outputs :text)))))
+
 (provide 'ein-pytools)
 
 ;;; ein-pytools.el ends here

lisp/ein_remote_safe.py

@@ -20,6 +20,14 @@ along with ein.py.  If not, see <http://www.gnu.org/licenses/>.
 
 """
 
+__ein_pytools_version = "1.0.0"
+
+try:
+    from matplotlib import rc as __ein_rc
+    from matplotlib import rcParams as __ein_rcParams
+    __ein_matplotlib_available = True
+except ImportError:
+    __ein_matplotlib_available = False
 
 def __ein_export_nb(nb_json, format):
     import IPython.nbconvert as nbconvert
@@ -61,13 +69,32 @@ try:
 except ImportError:
     __ein_find_edit_target = __ein_find_edit_target_012
 
-def __ein_set_figure_size(*dim):
-    try:
-        from matplotlib.pyplot import rcParams
-        rcParams['figure.figsize'] = dim
-    except:
+
+def __ein_set_matplotlib_param(family, setting, value):
+    settings = {}
+    if __ein_matplotlib_available:
+        settings[setting] = eval(value)
+        __ein_rc(family, **settings)
+    else:
         raise RuntimeError("Matplotlib not installed in this instance of python!")
 
+
+def __ein_set_figure_size(dim):
+    __ein_set_matplotlib_param('figure', 'figsize', dim)
+
+
+def __ein_set_figure_dpi(dpi):
+    __ein_set_matplotlib_param('figure', 'dpi', dpi)
+
+
+def __ein_get_matplotlib_params():
+    if __ein_matplotlib_available:
+        import json
+        print(json.dumps([k for k in __ein_rcParams.keys()]))
+    else:
+        raise RuntimeError("Matplotlib not installed in this instance of python!")
+
+
 def __ein_find_source(name):
     """Given an object as string, `name`, print its place in source code."""
     # FIXME: use JSON display object instead of stdout