debug magic: protection when running code in another cell; added show…

… magic - puts data into pager area; removed debug info

jupyter_kernel/magics/debug_magic.py

@@ -70,7 +70,7 @@ def cell_debug(self):
 
 function breakpoint_q(line) {
     var info = cell.code_mirror.lineInfo(line - 1);
-    return (info.gutterMarkers != null);
+    return (info && info.gutterMarkers != null);
 }
 
 var cell = IPython.notebook.get_selected_cell(); 
@@ -115,8 +115,6 @@ def cell_debug(self):
 function handle_output(out){
     var res = null;
     var data = null;
-    console.log(out);
-     // if output is a print statement
     if (out.msg_type == "stream") {
         res = out.content.data;
         document.getElementById("result_stream").innerText = res.toString() + document.getElementById("result_stream").innerText;
@@ -134,8 +132,6 @@ def cell_debug(self):
             data = JSON.parse(str.substring(12, str.length - 1));
             var speed = Number(document.getElementById("speed").value);
             if (data) {
-                //console.log(data);
-                //console.log(breakpoint_q(data[0]));
                 var breakp = breakpoint_q(data[0]);
                 if (speed < 100 || !running || breakp) { // max_speed
                     highlight(cell, data);

jupyter_kernel/magics/show_magic.py

@@ -0,0 +1,29 @@
+# Copyright (c) Calico Development Team.
+# Distributed under the terms of the Modified BSD License.
+# http://calicoproject.org/
+
+from jupyter_kernel import Magic, option
+import os
+
+class ShowMagic(Magic):
+
+    def cell_show(self):
+        """
+        %%show - load cell contents into system pager
+
+        This cell magic will put the contents the cell into
+        the system pager.
+
+        Example:
+            %%show
+
+            This information will appear in the pager.
+        """
+        self.kernel.payload = [{"data": {"text/plain": self.code},
+                                "start_line_number": 0,
+                                "source": "page"}]
+        self.evaluate = False
+
+def register_magics(kernel):
+    kernel.register_magics(ShowMagic)
+