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PyconTW/simplify-unix-path.py

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+def simplify_path(path):
+    """
+        simplifying a given path
+    """
+    folders = path.split("/")
+    new_folders = []
+    for folder in folders:
+        if folder == "" or folder == ".":
+            continue
+        elif folder == "..":
+            try:
+                if new_folders[-1] != "..":
+                    new_folders.pop()
+                else:
+                    new_folders.append("..")
+            except IndexError:
+                if path[0] == "/":
+                    print("you can't go deeper than root folder")
+                else:
+                    new_folders.append("..")
+        else:
+            new_folders.append(folder)
+    new_folders = "/".join(new_folders)
+    if not path[0].isalpha() and path[0] != ".":
+        new_folders = path[0] + new_folders
+    if len(new_folders) == 0:
+        new_folders = "."
+    print(new_folders)
+    return new_folders
+
+
+if __name__ == '__main__':
+    # These "asserts" using only for self-checking and not necessary for auto-testing
+
+    # last slash is not important
+    assert simplify_path('/a/') == '/a'
+
+    # double slash can be united in one
+    assert simplify_path('/a//b/c') == '/a/b/c'
+
+    # double dot - go to previous folder
+    assert simplify_path('dir/fol/../no') == 'dir/no'
+    assert simplify_path('dir/fol/../../no') == 'no'
+
+    # one dot means current dir
+    assert simplify_path('/a/b/./ci') == '/a/b/ci'
+    assert simplify_path('vi/..') == '.'
+    assert simplify_path('./.') == '.'
+
+    # you can't go deeper than root folder
+    assert simplify_path('/for/../..') == '/'
+    assert simplify_path('/for/../../no/..') == '/'
+
+    # not all double-dots can be simplyfied in related path
+    assert simplify_path('for/../..') == '..'
+    assert simplify_path('../foo') == '../foo'
+
+    assert simplify_path(".././..") == "../.."
+    print('Simply enough! Let\'s check it now!!')