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authorChris Larson <chris_larson@mentor.com>2010-04-14 17:59:49 -0700
committerChris Larson <chris_larson@mentor.com>2010-04-23 14:20:42 -0700
commitbb753c4f0bc7fe463e7939a1f2685504a9a0f883 (patch)
tree8185a9128e893b44ca124e6d8a6d02e245f0efbe /lib/oe/path.py
parent5816ec4860aba7289483b87b4aa4909eee50fae9 (diff)
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Initial move of common python bits into modules of the 'oe' python package
Signed-off-by: Chris Larson <chris_larson@mentor.com>
Diffstat (limited to 'lib/oe/path.py')
-rw-r--r--lib/oe/path.py46
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/oe/path.py b/lib/oe/path.py
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+++ b/lib/oe/path.py
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+def join(a, *p):
+ """Like os.path.join but doesn't treat absolute RHS specially"""
+ path = a
+ for b in p:
+ if path == '' or path.endswith('/'):
+ path += b
+ else:
+ path += '/' + b
+ return path
+
+def relative(src, dest):
+ """ Return a relative path from src to dest.
+
+ >>> relative("/usr/bin", "/tmp/foo/bar")
+ ../../tmp/foo/bar
+
+ >>> relative("/usr/bin", "/usr/lib")
+ ../lib
+
+ >>> relative("/tmp", "/tmp/foo/bar")
+ foo/bar
+ """
+ from os.path import sep, pardir, normpath, commonprefix
+
+ destlist = normpath(dest).split(sep)
+ srclist = normpath(src).split(sep)
+
+ # Find common section of the path
+ common = commonprefix([destlist, srclist])
+ commonlen = len(common)
+
+ # Climb back to the point where they differentiate
+ relpath = [ pardir ] * (len(srclist) - commonlen)
+ if commonlen < len(destlist):
+ # Add remaining portion
+ relpath += destlist[commonlen:]
+
+ return sep.join(relpath)
+
+def format_display(path, metadata):
+ """ Prepare a path for display to the user. """
+ rel = relative(metadata.getVar("TOPDIR", 1), path)
+ if len(rel) > len(path):
+ return path
+ else:
+ return rel