Backport PR #6706: Correctly display prompt numbers that are 'None'

Fixes  #6702

IPython/html/tests/notebook/prompt_numbers.js

@@ -0,0 +1,36 b''
+
+// Test
+casper.notebook_test(function () {
+
+    var that = this;
+    var set_prompt = function (i, val) {
+        that.evaluate(function (i, val) {
+            var cell = IPython.notebook.get_cell(i);
+            cell.set_input_prompt(val);
+        }, [i, val]);
+    };
+
+    var get_prompt = function (i) {
+        return that.evaluate(function (i) {
+            var elem = IPython.notebook.get_cell(i).element;
+            return elem.find('div.input_prompt').html();
+        }, [i]);
+    };
+
+    this.then(function () {
+        var a = 'print("a")';
+        var index = this.append_cell(a);
+
+        this.test.assertEquals(get_prompt(index), "In [ ]:", "prompt number is   by default");
+        set_prompt(index, 2);
+        this.test.assertEquals(get_prompt(index), "In [2]:", "prompt number is 2");
+        set_prompt(index, 0);
+        this.test.assertEquals(get_prompt(index), "In [0]:", "prompt number is 0");
+        set_prompt(index, "*");
+        this.test.assertEquals(get_prompt(index), "In [*]:", "prompt number is *");
+        set_prompt(index, undefined);
+        this.test.assertEquals(get_prompt(index), "In [ ]:", "prompt number is  ");
+        set_prompt(index, null);
+        this.test.assertEquals(get_prompt(index), "In [ ]:", "prompt number is  ");
+    });
+});

IPython/nbconvert/exporters/tests/files/prompt_numbers.ipynb

@@ -0,0 +1,81 b''
+{
+ "metadata": {
+  "name": "notebook2"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import numpy as np"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "evs = np.zeros(100)",
+      "evs.shape"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "metadata": {},
+       "output_type": "pyout",
+       "prompt_number": 10,
+       "text": [
+        "(100,)"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": null
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": "*"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 0
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
  No newline at end of file

IPython/html/static/notebook/js/codecell.js

@@ -396,7 +396,7 b' var IPython = (function (IPython) {'
 
     CodeCell.input_prompt_classical = function (prompt_value, lines_number) {
         var ns;
-        if (prompt_value === undefined) {
+        if (prompt_value === undefined || prompt_value === null) {
             ns = " ";
         } else {
             ns = encodeURIComponent(prompt_value);

IPython/nbconvert/exporters/tests/test_html.py

@@ -15,6 +15,7 b''
 from .base import ExportersTestsBase
 from ..html import HTMLExporter
 from IPython.testing.decorators import onlyif_any_cmd_exists
+import re
 
 #-----------------------------------------------------------------------------
 # Class
@@ -59,3 +60,18 b' class TestHTMLExporter(ExportersTestsBase):'
         (output, resources) = HTMLExporter(template_file='full').from_filename(self._get_notebook())
         assert len(output) > 0
 
+    @onlyif_any_cmd_exists('nodejs', 'node', 'pandoc')
+    def test_prompt_number(self):
+        """
+        Does HTMLExporter properly format input and output prompts?
+        """
+        (output, resources) = HTMLExporter(template_file='full').from_filename(
+            self._get_notebook(nb_name="prompt_numbers.ipynb"))
+        in_regex = r"In \[(.*)\]:"
+        out_regex = r"Out\[(.*)\]:"
+
+        ins = ["2", "10", " ", " ", "*", "0"]
+        outs = ["10"]
+
+        assert re.findall(in_regex, output) == ins
+        assert re.findall(out_regex, output) == outs

IPython/nbconvert/templates/html/basic.tpl

@@ -23,7 +23,11 b''
 
 {% block in_prompt -%}
 <div class="prompt input_prompt">
-In&nbsp;[{{ cell.prompt_number }}]:
+{%- if cell.prompt_number is defined -%}
+In&nbsp;[{{ cell.prompt_number|replace(None, "&nbsp;") }}]:
+{%- else -%}
+In&nbsp;[&nbsp;]:
+{%- endif -%}
 </div>
 {%- endblock in_prompt %}
 
@@ -51,7 +55,11 b' In&nbsp;[{{ cell.prompt_number }}]:'
 <div class="output_area">
 {%- if output.output_type == 'pyout' -%}
     <div class="prompt output_prompt">
-    Out[{{ cell.prompt_number }}]:
+{%- if cell.prompt_number is defined -%}
+    Out[{{ cell.prompt_number|replace(None, "&nbsp;") }}]:
+{%- else -%}
+    Out[&nbsp;]:
+{%- endif -%}
 {%- else -%}
     <div class="prompt">
 {%- endif -%}

IPython/nbconvert/templates/latex/style_bw_ipython.tplx

@@ -33,7 +33,11 b''
 % Name: draw_prompt
 % Purpose: Renders an output/input prompt
 ((* macro add_prompt(text, cell, prompt) -*))
-    ((*- set prompt_number = "" ~ cell.prompt_number -*))
+    ((*- if cell.prompt_number is defined -*))
+    ((*- set prompt_number = "" ~ (cell.prompt_number | replace(None, " ")) -*))
+    ((*- else -*))
+    ((*- set prompt_number = " " -*))
+    ((*- endif -*))
     ((*- set indentation = " " * (prompt_number | length + 7) -*))
 \begin{verbatim}
 (((- text | add_prompts(first=prompt ~ '[' ~ prompt_number ~ ']: ', cont=indentation) -)))

IPython/nbconvert/templates/latex/style_ipython.tplx

@@ -46,7 +46,11 b''
 % Name: draw_prompt
 % Purpose: Renders an output/input prompt
 ((* macro add_prompt(text, cell, prompt, prompt_color) -*))
-    ((*- set prompt_number = "" ~ cell.prompt_number -*))
+    ((*- if cell.prompt_number is defined -*))
+    ((*- set prompt_number = "" ~ (cell.prompt_number | replace(None, " ")) -*))
+    ((*- else -*))
+    ((*- set prompt_number = " " -*))
+    ((*- endif -*))
     ((*- set indention =  " " * (prompt_number | length + 7) -*))
 \begin{Verbatim}[commandchars=\\\{\}]
 ((( text | add_prompts(first='{\color{' ~ prompt_color ~ '}' ~ prompt ~ '[{\\color{' ~ prompt_color ~ '}' ~ prompt_number ~ '}]:} ', cont=indention) )))