Create tree from list of indented strings

[Sup3rGeo]

Hi,

I am using anytree to generate a tree-view of pytest hooks based on a log file with indented hooks. pytest-dev/pytest#3261

For that I needed to create a function to convert a list of indented strings to a tree. Apparently another users on stackoverflow have needed it:
https://codereview.stackexchange.com/questions/176391/parsing-indented-text-and-inserting-its-data-into-a-tree
https://stackoverflow.com/questions/17858404/creating-a-tree-deeply-nested-dict-from-an-indented-text-file-in-python
https://stackoverflow.com/questions/32101253/converting-a-string-to-a-tree-structure-in-python?rq=1

I have created the following script for doing this and it is quite simple:
https://github.com/Sup3rGeo/pytest/blob/master/doc/pytesthooks.py

I believe it makes sense to make this part of anytree as a "indented strings importer".

So if you agree I would gladly add a pull request for this. Thanks!

[c0fec0de]

Good idea to have a IndentedStringImporter class.

Please add an optional callback for creating the single node class instance as the nodecls attribute of the DictImporter does (http://anytree.readthedocs.io/en/latest/importer/dictimporter.html#module-anytree.importer.dictimporter)

Tests with 100% coverage would be highly appreciated.

[Sup3rGeo]

pull request made (#48)

[Sup3rGeo]

Hi! I see the documentation for the feature, but the PyPI package v2.4.3 I installed doesn't seem to have it.

[c0fec0de]

I need to release the package. The documentation got accidentally updated. I'll fix that.

[stevenlis]

I think the package, but could found a easy way to costruct a tree from a list like the following:

[['harry', 'jane', 'diane', 'mary'],
 ['harry', 'jane', 'mark'],
 ['harry', 'jane', 'diane', 'george', 'jill'],
 ['harry', 'bill']]

Maybe I missed something?