oh-my-git/levels/low-level/tree-nested

[description]

Trees can also point to other trees! This way, they can describe nested directory structures.

When you add a file inside of a directory to the index, and then call `git write-tree`, it will create a nested tree for the directory, and attach the blob to it.

To solve this level, build a little stick figure, as shown on the left - a tree that points to two blobs, as well to a tree that points to two blobs.

[setup]

[setup goal]

echo "I'm the left arm" > arm1
echo "I'm the right arm" > arm2
mkdir hip
echo "I'm the left leg" > hip/leg1
echo "I'm the right leg" > hip/leg2
git add .
git write-tree

[win]

TREES=$(git cat-file --batch-check='%(objectname) %(objecttype)' --batch-all-objects | grep tree | cut -f1 -d" ")

for OUTER_TREE in $TREES; do
    NUMBER_OF_BLOB_CHILDREN=$(git cat-file -p $OUTER_TREE | cut -f2 -d" " | grep blob | wc -l)
    NUMBER_OF_TREE_CHILDREN=$(git cat-file -p $OUTER_TREE | cut -f2 -d" " | grep tree | wc -l)

    if [ $NUMBER_OF_BLOB_CHILDREN -eq 2 -a $NUMBER_OF_TREE_CHILDREN -eq 1 ]; then
        TREE_CHILD=$(git cat-file -p $OUTER_TREE | cut -f1 | grep tree | cut -d" " -f3)
        NUMBER_OF_BLOB_CHILDREN_OF_TREE_CHILD=$(git cat-file -p $TREE_CHILD | cut -f2 -d" " | grep blob | wc -l)
        if [ $NUMBER_OF_BLOB_CHILDREN_OF_TREE_CHILD -eq 2 ]; then
            return 0
        fi
    fi
done

return 1