add/fit-in suggestions

heudiconv/convert.py

@@ -297,6 +297,16 @@ def prep_conversion(
             )
 
 
+IMAGETYPE_TO_PARTS = {
+    "M": "mag",
+    "MAGNITUDE": "mag",
+    "P": "phase",
+    "PHASE": "phase",
+    "REAL": "real",
+    "IMAGINARY": "imag",
+}
+
+
 def update_complex_name(metadata: dict[str, Any], filename: str) -> str:
     """
     Insert `_part-<mag|phase|real|imag>` entity into filename if data are from a
@@ -330,18 +340,21 @@ def update_complex_name(metadata: dict[str, Any], filename: str) -> str:
     if any(ut in filename for ut in unsupported_types):
         return filename
 
-    # Check to see if it is magnitude or phase part:
     img_type = cast(List[str], metadata.get("ImageType", []))
-    if "M" in img_type or "MAGNITUDE" in img_type:
-        part = "mag"
-    elif "P" in img_type or "PHASE" in img_type:
-        part = "phase"
-    elif "REAL" in img_type:
-        part = "real"
-    elif "IMAGINARY" in img_type:
-        part = "imag"
+
+    present_parts = set(
+        IMAGETYPE_TO_PARTS[tp] for tp in img_type if tp in IMAGETYPE_TO_PARTS
+    )
+    if not present_parts:
+        raise RuntimeError(
+            f"Data type could not be inferred from the ImageType={img_type}. Known types are: {sorted(IMAGETYPE_TO_PARTS)}"
+        )
+    elif len(present_parts) == 1:
+        part = present_parts.pop()
     else:
-        raise RuntimeError("Data type could not be inferred from the metadata.")
+        raise RuntimeError(
+            f"Data type could not be inferred from the ImageType={img_type}. Multiple BIDS parts matched: {present_parts}"
+        )
 
     # Determine scan suffix
     filetype = "_" + filename.split("_")[-1]
@@ -979,13 +992,12 @@ def save_converted_files(
         is_uncombined = (
             len(set(filter(bool, channel_names))) > 1
         )  # Check for uncombined data
-        CPLX_PARTS = ["MAGNITUDE", "PHASE", "IMAGINARY", "REAL"]
         is_complex = len(
             set(
                 [
                     part
                     for its in image_types
-                    for part in CPLX_PARTS
+                    for part in IMAGETYPE_TO_PARTS.keys()
                     if part in its or part[0] in its
                 ]
             )