From 7fd39ba4de0c860401e0e6fa5d4b32e86f3f1edc Mon Sep 17 00:00:00 2001
From: Paul McCarthy <pauldmccarthy@gmail.com>
Date: Sun, 27 Jan 2019 12:16:52 +0000
Subject: [PATCH] ENH: New function in path module - commonBase
---
fsl/utils/path.py | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/fsl/utils/path.py b/fsl/utils/path.py
index 4190865a8..e9a577f20 100644
--- a/fsl/utils/path.py
+++ b/fsl/utils/path.py
@@ -22,12 +22,14 @@ paths.
getFileGroup
removeDuplicates
uniquePrefix
+ commonBase
"""
import os.path as op
import os
import glob
+import operator
class PathError(Exception):
@@ -471,3 +473,27 @@ def uniquePrefix(path):
hits = [h for h in hits if h.startswith(prefix)]
return prefix
+
+
+def commonBase(paths):
+ """Identifies the deepest common base directory shared by all files
+ in ``paths``.
+
+ Raises a :exc:`PathError` if the paths have no common base. This will
+ never happen for absolute paths (as the base will be e.g. ``'/'``).
+ """
+
+ depths = [len(p.split(op.sep)) for p in paths]
+ base = max(zip(depths, paths), key=operator.itemgetter(0))[1]
+
+ while True:
+
+ base = op.split(base)[0]
+
+ if len(base) == 0:
+ break
+
+ if all([p.startswith(base) for p in paths]):
+ return base
+
+ raise PathError('No common base')
--
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