Support magics in markdown cells in light format #99

jupytext/cell_reader.py

@@ -316,7 +316,7 @@ def options_to_metadata(self, options):
         raise NotImplementedError()
 
     def uncomment_code_and_magics(self, lines):
-        if self.cell_type == 'code':
+        if self.cell_type == 'code' or self.comment != "#'":
             if self.comment_magics:
                 if is_active(self.ext, self.metadata):
                     uncomment_magic(lines, self.language or self.default_language)
@@ -443,7 +443,7 @@ def find_cell_content(self, lines):
 
         if self.cell_type != 'code':
             source = uncomment(source, self.comment)
-        elif self.comment_magics:
+        if self.comment_magics:
             source = self.uncomment_code_and_magics(source)
 
         self.content = source

jupytext/cell_to_text.py

@@ -76,6 +76,10 @@ def cell_to_text(self):
 
     def markdown_to_text(self, source):
         """Escape the given source, for a markdown cell"""
+        if self.comment and self.comment != "#'":
+            source = copy(source)
+            comment_magic(source, self.language, self.comment_magics)
+
         return comment_lines(source, self.comment)
 
     def code_to_text(self):
@@ -311,8 +315,7 @@ def cell_to_text(self):
             source = copy(self.source)
             if not source:
                 source == ['']
-            comment_magic(source, self.language, self.comment_magics)
-            return source
+            return comment_magic(source, self.language, self.comment_magics)
 
         if 'cell_marker' in self.metadata:
             cell_marker = self.metadata.pop('cell_marker')

tests/notebooks/mirror/ipynb_to_script/Reference Guide for Calysto Scheme.ss

@@ -125,7 +125,7 @@ vectorᵢ
 ;; It has breakpoints (click in left margin). You must press Stop to exit the debugger.
 
 ;; ```scheme
-;; %%debug
+;; ;; %%debug
 ;;
 ;; (begin
 ;;  (define x 1)

tests/test_mirror.py

@@ -98,7 +98,6 @@ def test_ipynb_to_R(nb_file):
     assert_conversion_same_as_mirror(nb_file, '.R', 'ipynb_to_script')
 
 
-@pytest.mark.skip(reason='Magics in markdown cells break this test')
 @pytest.mark.parametrize('nb_file', list_notebooks('ipynb_scheme'))
 def test_ipynb_to_scheme(nb_file):
     assert_conversion_same_as_mirror(nb_file, '.ss', 'ipynb_to_script')

tests/test_read_simple_python.py

@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
+from nbformat.v4.nbbase import new_markdown_cell, new_notebook
 from testfixtures import compare
 import jupytext
 
@@ -495,3 +496,11 @@ def h(x):
     script2 = jupytext.writes(notebook, ext='.py')
 
     compare(script, script2)
+
+
+def test_round_trip_markdown_cell_with_magic():
+    notebook = new_notebook(cells=[new_markdown_cell('IPython has magic commands like\n%quickref')],
+                            metadata={'jupytext': {'main_language': 'python'}})
+    text = jupytext.writes(notebook, ext='.py')
+    notebook2 = jupytext.reads(text, ext='.py')
+    compare(notebook, notebook2)