Create and order interface lists

[qduk]

No description provided.

[dgjustice]

@qduk, a friend needed a solution to this very problem today, so I put something together that I believe addresses the issues we found along the way. Basically, it separates characters into classes with weights and does a 2-stage sort. Feel free to copy/paste it to your heart's content.

https://gist.github.com/dgjustice/84117af73541728ece78cb33c6d37ecb

[qduk]

@dgjustice Finally had a chance to dive into this. There was a lot I didn't understand at first but what you wrote is super cool! One issue I ran into is that it sorts interface without "/" or "." not in numerical order. For example, if I use the test data of
test_data = ['Port-channel40', 'Port-channel160', "Loopback99", "Loopback101", "Loopback98", "Loopback102"] I get

Loopback101
Loopback102
Loopback98
Loopback99
Port-channel160
Port-channel40

I ended up solving that by sorting the list in place using

for k,v in groupby(test_data, lambda x: "/" not in x and "." not in x):
    if k == True:
        for r,s in groupby(v, lambda x: x.rstrip("0123456789")):
            s = list(s)
            first_index = test_data.index(s[0])
            last_index = test_data.index(s[-1])
            test_data[first_index:last_index+1] = sorted(test_data[first_index:last_index+1], reverse=True)

I'm sure there is a way to do it in the iteration of the tree but the above method seemed to work.

I also ran into an issue where it seemed to be skipping interfaces. When I used this test data
["Gi1/0/1", "Gi1/0/3", "Gi1/0/3.100", "Gi1/0/2", "Gi1/0/2.50", "Po40", "Po160", "Lo10"]
I get this back.

Gi1/0/1
Gi1/0/2.50
Gi1/0/3.100
Lo10
Po160
Po40

I'm not really sure why it's missing the Gi1/0/2 and Gi1/0/3. That's what I'm trying to look into now. Any help/advice would be appreciated! Thanks @dgjustice

[dgjustice]

@qduk I'll submit my own PR with tests.

[jeffkala]

Couple small ones.