Merge branch 'bf/featdesign' into 'main'

BF: Adjust `loadFEATDesignFile` to handle missing values

See merge request fsl/fslpy!469

CHANGELOG.rst

 This document contains the ``fslpy`` release history in reverse chronological
 order.
 
+XXX (Under development)
+-----------------------
+
+
+Fixed
+^^^^^
+
+* Adjusted the :func:`.featdesign.loadFEATDesignFile` function to handle missing
+  values (!469).
+
 
 3.22.0 (Monday 17th February 2025)
 ----------------------------------

fsl/data/featanalysis.py

@@ -544,7 +544,12 @@ def loadFEATDesignFile(filename):
         if line == '':
             continue
 
-        name, value  = line.split(maxsplit=1)
+        tokens = line.split(maxsplit=1)
+        if len(tokens) == 1:
+            name, value = tokens[0], ''
+        else:
+            name, value = tokens
+
         fields[name] = value
 
     return fields

fsl/tests/test_featdesign.py

@@ -103,8 +103,9 @@ with the following commands:
 """
 
 
-import os.path as op
-import numpy   as np
+import os.path  as op
+import textwrap as tw
+import numpy    as np
 
 import pytest
 
@@ -400,6 +401,45 @@ def test_loadDesignMat():
         featdesign.loadDesignMat(badfile)
 
 
+# fsl/fslpy!469
+def test_loadFEATDesignFile():
+    with tempdir():
+        with open('design1.con', 'wt') as f:
+            f.write(tw.dedent("""
+            /ContrastName1  mycontrast
+            /NumWaves       2
+            /NumContrasts   1
+
+            /Matrix
+            10 20
+            """).strip())
+
+        with open('design2.con', 'wt') as f:
+            f.write(tw.dedent("""
+            /ContrastName1
+            /NumWaves       2
+            /NumContrasts   1
+
+            /Matrix
+            10 20
+            """).strip())
+
+        des1 = featanalysis.loadFEATDesignFile('design1.con')
+        exp1 = {'ContrastName1': 'mycontrast',
+                'NumWaves':      '2',
+                'NumContrasts':  '1',
+                'Matrix':        '10 20'}
+
+        des2 = featanalysis.loadFEATDesignFile('design2.con')
+        exp2 = {'ContrastName1': '',
+                'NumWaves':      '2',
+                'NumContrasts':  '1',
+                'Matrix':        '10 20'}
+
+        assert des1 == exp1
+        assert des2 == exp2
+
+
 def test_VoxelwiseEVs():
     with tempdir():
         img = tests.make_random_image('image.nii.gz', (10, 10, 10, 10))