update.

README.rst

@@ -97,7 +97,13 @@ On the relationship between ASLPrep and fMRIPrep
 ************************************************
 
 ASLPrep is largely based on fMRIPrep, as ASL processing is very similar to fMRI processing.
-There are several crucial differences though:
+fMRIPrep is developed by a larger group and receives more regular feedback on its workflow,
+so we (the ASLPrep developers) try to update ASLPrep in line with fMRIPrep.
+
+ASLPrep and fMRIPrep are both part of the NiPreps community.
+
+There are several crucial differences between ASL and fMRI processing,
+which must be accounted for in ASLPrep:
 
 1. ASL processing does not include slice timing correction.
    Instead, post-labeling delays are shifted based on the slice timing when CBF is calculated.

aslprep/workflows/asl/base.py

@@ -767,6 +767,9 @@ def init_asl_preproc_wf(
             ])  # fmt:skip
 
         def _last(inlist):
+            if not isinstance(inlist, list):
+                raise ValueError(f"_last: input is not list ({inlist})")
+
             return inlist[-1]
 
         workflow.connect([
@@ -797,4 +800,7 @@ def _read_json(in_file):
     from json import loads
     from pathlib import Path
 
+    if not isinstance(in_file, str):
+        raise ValueError(f"_read_json: input is not str ({in_file})")
+
     return loads(Path(in_file).read_text())

aslprep/workflows/asl/cbf.py

@@ -272,12 +272,18 @@ def init_cbf_wf(
 
     # Warp tissue probability maps to ASL space
     def _pick_gm(files):
+        if not isinstance(files, list):
+            raise ValueError(f"_pick_gm: input is not list ({files})")
         return files[0]
 
     def _pick_wm(files):
+        if not isinstance(files, list):
+            raise ValueError(f"_pick_wm: input is not list ({files})")
         return files[1]
 
     def _pick_csf(files):
+        if not isinstance(files, list):
+            raise ValueError(f"_pick_csf: input is not list ({files})")
         return files[2]
 
     def _getfiledir(file):
@@ -612,6 +618,9 @@ def _pick_csf(files):
     def _getfiledir(file):
         import os
 
+        if not isinstance(file, str):
+            raise ValueError(f"_getfiledir: input is not str ({file})")
+
         return os.path.dirname(file)
 
     # convert tmps to asl_space

aslprep/workflows/asl/outputs.py

@@ -518,7 +518,7 @@ def init_ds_asl_native_wf(
 
     raw_sources = pe.Node(niu.Function(function=_bids_relative), name="raw_sources")
     raw_sources.inputs.bids_root = bids_root
-    workflow.connect(inputnode, "source_files", raw_sources, "in_files")
+    workflow.connect([(inputnode, raw_sources, [("source_files", "in_files")])])
 
     # Masks should be output if any other derivatives are output
     ds_asl_mask = pe.Node(