make mistletoe optional

Author: jph00

execnb/shell.py

@@ -9,7 +9,7 @@
 from fastcore.script import call_parse
 from fastcore.ansi import ansi2html
 
-import mistletoe,multiprocessing,types,traceback,signal
+import multiprocessing,types,traceback,signal
 try:
     if sys.platform == 'darwin': multiprocessing.set_start_method("fork")
 except RuntimeError: pass # if re-running cell
@@ -138,6 +138,8 @@ def run(self:CaptureShell,
 
 # %% ../nbs/02_shell.ipynb
 def render_outputs(outputs, ansi_renderer=strip_ansi):
+    try: import mistletoe
+    except ImportError: return print('mistletoe not found -- please install it')
     def render_output(out):
         otype = out['output_type']
         if otype == 'stream':

nbs/02_shell.ipynb

@@ -32,7 +32,7 @@
     "from fastcore.script import call_parse\n",
     "from fastcore.ansi import ansi2html\n",
     "\n",
-    "import mistletoe,multiprocessing,types,traceback,signal\n",
+    "import multiprocessing,types,traceback,signal\n",
     "try:\n",
     "    if sys.platform == 'darwin': multiprocessing.set_start_method(\"fork\")\n",
     "except RuntimeError: pass # if re-running cell\n",
@@ -817,6 +817,8 @@
    "source": [
     "#| export\n",
     "def render_outputs(outputs, ansi_renderer=strip_ansi):\n",
+    "    try: import mistletoe\n",
+    "    except ImportError: return print('mistletoe not found -- please install it')\n",
     "    def render_output(out):\n",
     "        otype = out['output_type']\n",
     "        if otype == 'stream':\n",

settings.ini

@@ -11,8 +11,8 @@ author_email = [email protected]
 branch = master
 version = 0.1.7
 min_python = 3.7
-requirements = fastcore>=1.5.5 ipython mistletoe
-dev_requirements = matplotlib Pillow
+requirements = fastcore>=1.5.5 ipython
+dev_requirements = matplotlib Pillow mistletoe
 console_scripts = exec_nb=execnb.shell:exec_nb
 audience = Developers
 language = English