Revert "Remove reliance on IPython's coloransi"

Author: minrk

ipyparallel/client/client.py

@@ -26,6 +26,7 @@
 from IPython.core.profiledir import ProfileDir, ProfileDirError
 from IPython.paths import get_ipython_dir
 from IPython.utils.capture import RichOutput
+from IPython.utils.coloransi import TermColors
 from IPython.utils.path import compress_user
 from jupyter_client.localinterfaces import is_local_ip, localhost
 from jupyter_client.session import Session
@@ -154,18 +155,37 @@ def __repr__(self):
 
         return f"<ExecuteReply[{self.execution_count}]: {text_out}>"
 
-    def _plaintext(self) -> str:
+    def _plaintext(self):
         execute_result = self.metadata['execute_result'] or {'data': {}}
         text_out = execute_result['data'].get('text/plain', '')
 
         if not text_out:
             return ''
 
+        ip = get_ipython()
+        if ip is None:
+            colors = "NoColor"
+        else:
+            colors = ip.colors
+
+        if colors == "NoColor":
+            out = normal = ""
+        else:
+            out = TermColors.Red
+            normal = TermColors.Normal
+
         if '\n' in text_out and not text_out.startswith('\n'):
             # add newline for multiline reprs
             text_out = '\n' + text_out
 
-        return f"Out[{self.metadata['engine_id']}:{self.execution_count}]: {text_out}"
+        return ''.join(
+            [
+                out,
+                f"Out[{self.metadata['engine_id']}:{self.execution_count}]: ",
+                normal,
+                text_out,
+            ]
+        )
 
     def _repr_pretty_(self, p, cycle):
         p.text(self._plaintext())