Inconsistent network interface matching between OSX and other operating systems

[romkatv]

1. On OSX (and only on OSX) network interfaces whose names contain "lo" are ignored.

For example, suppose I have a network interface called "slow" and I define these options:

POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(ip)
POWERLEVEL9K_IP_INTERFACE=slow

On OSX I won't see ip segment but on other operating systems I will.

2. On OSX network interfaces must match completely while on OSX matching is more relaxed.

With the same settings as before:

POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(ip)
POWERLEVEL9K_IP_INTERFACE=slow

On OSX this will match the following interfaces (an incomplete list):

• slow
• notslow
• slowr

On other operating systems it will only match "slow".