Only require user to have Ipython installed for using the ipython debugger

Author: Wu Jianxiao

pydra/scripts/cli.py

@@ -2,7 +2,6 @@
 import pdb
 import sys
 
-from IPython.core import ultratb
 import click
 import cloudpickle as cp
 
@@ -40,9 +39,16 @@ def crash(crashfile, rerun, debugger=None):
                     job_obj = cp.load(f)
 
                 if debugger == "ipython":
-                    sys.excepthook = ultratb.FormattedTB(
-                        mode="Verbose", theme_name="Linux", call_pdb=True
-                    )
+                    try:
+                        from IPython.core import ultratb
+
+                        sys.excepthook = ultratb.FormattedTB(
+                            mode="Verbose", theme_name="Linux", call_pdb=True
+                        )
+                    except ImportError:
+                        raise ImportError(
+                            "'Ipython' needs to be installed to use the 'ipython' debugger"
+                        )
 
                 try:
                     job_obj.run(rerun=True)

pyproject.toml

@@ -14,7 +14,6 @@ dependencies = [
     "filelock >=3.0.0",
     "fileformats >=0.15.0a7",
     "platformdirs >=2",
-    "ipython",
 ]
 license = { file = "LICENSE" }
 authors = [{ name = "Nipype developers", email = "[email protected]" }]
@@ -44,6 +43,7 @@ doc = [
     "fileformats-medimage >= v0.10.0a2",
     "fileformats-medimage-extras >= v0.10.0a2",
     "furo>=2022.2.14.1",
+    "ipython",
     "ipykernel",
     "ipywidgets",
     "matplotlib",