* yeni path fonksiyonlari implement et

* archiveRoot'u implement et unpack_file_cond() icinde

pisi/archive.py

@@ -57,17 +57,20 @@ class ArchiveZip(ArchiveBase):
     def __init__(self, filepath, type="zip"):
 	super(ArchiveZip, self).__init__(filepath, type)
 
-    def unpack_file_cond(self, pred, targetDir, extractRoot=''):
+    def unpack_file_cond(self, pred, targetDir, archiveRoot=''):
         """ unpack file according to predicate function filename -> bool"""
 	super(ArchiveTarFile, self).unpack(targetDir)
 
         zip = zipfile.ZipFile(self.filePath, 'r')
         for file in zip.namelist():
             if pred(file):              # check if condition holds
-                if extractRoot=='':
-                    ofile = os.path.join(targetDir, file)
-                else:
-                    raise ArchiveError("changing extraction root not implemented yet")
+                if archiveRoot!='':
+                    # change archiveRoot
+                    if util.subpath(archiveRoot, file):
+                        file = util.removepathprefix(archiveRoot, file)
+                    else:
+                        continue        # don't extract if not under
+                ofile = os.path.join(targetDir, file)
                 if os.path.isdir(ofile):
                     continue
                 util.check_dir(os.path.dirname(ofile))

pisi/util.py

@@ -41,6 +41,11 @@ def prefix(a, b):
         if a[i]!=b[i]:
             return False
     return True
+
+def remove_prefix(a,b):
+    "remove prefix a from sequence b"
+    assert prefix(a,b)
+    return b[len(a):]
     
 # path functions
 
@@ -57,10 +62,14 @@ def commonprefix(l):
     return common
 
 # but this one is necessary
-def under_path(a, b):
-    """find if path a is a descendant of b in the directory tree"""
+def subpath(a, b):
+    """find if path a is before b in the directory tree"""
     return prefix(os.path.split(a), os.path.split(b))
 
+def removepathprefix(a, b):
+    comps = remove_prefix(os.path.split(a), os.path.split(b))
+    return reduce(os.path.join, comps)
+
 # file/dir functions
 
 def check_file(file, mode = os.F_OK):