compress_ipv6 fd0e:2146:5cf5:4560::0001: expected fd0e:2146:5cf5:4560::1, got fd0e:2146:5cf5:4560::0:1

[mgrant0]

1. in compress, you should expand the ip address first in case it's not really fully expanded
2. you're missing a 0:0:0 case

Here's a context diff for the fix, (sorry i didn't fork this and submit a merge):

diff -c wg-ip.orig wg-ip
*** wg-ip.orig  2020-09-04 15:36:42.466694574 -0400
--- wg-ip       2020-09-04 15:36:13.723316668 -0400
***************
*** 180,185 ****
--- 180,188 ----
  # unit tests for expand_ipv6
  test_expand_ipv6(){
        tests=" \
+               fd0e:2146:5cf5:4560::0001               fd0e:2146:5cf5:4560:0000:0000:0000:0001 \
+               fd0e:2146:5cf5:4560::0000:0001          fd0e:2146:5cf5:4560:0000:0000:0000:0001 \
+               fd0e:2146:5cf5:4560::0000:0000:0001     fd0e:2146:5cf5:4560:0000:0000:0000:0001 \
                2001:db8::2:1        2001:0db8:0000:0000:0000:0000:0002:0001 \
                2001:db8:0:1:1:1:1:1 2001:0db8:0000:0001:0001:0001:0001:0001 \
                2001:db8::1:0:0:1    2001:0db8:0000:0000:0001:0000:0000:0001 \
***************
*** 204,210 ****

  # returns a compressed ipv6 address under the form recommended by RFC5952
  compress_ipv6() {
!       ip=$1

        blocks=$(echo $ip | grep -o "[0-9a-f]\+")
        set $blocks
--- 207,213 ----

  # returns a compressed ipv6 address under the form recommended by RFC5952
  compress_ipv6() {
!       ip="$(expand_ipv6 $1)"

        blocks=$(echo $ip | grep -o "[0-9a-f]\+")
        set $blocks
***************
*** 223,228 ****
--- 226,232 ----
                        :0:0:0:0:0:0 \
                        :0:0:0:0:0 \
                        :0:0:0:0 \
+                       :0:0:0 \
                        :0:0; do
                if echo $ip | grep -qs $pattern; then
                        ip=$(echo $ip | sed "s/$pattern/::/")
***************
*** 241,246 ****
--- 245,254 ----
  # unit tests for compress_ipv6
  test_compress_ipv6(){
        tests=" \
+               fd0e:2146:5cf5:4560::0001               fd0e:2146:5cf5:4560::1 \
+               fd0e:2146:5cf5:4560::0000:0001          fd0e:2146:5cf5:4560::1 \
+               fd0e:2146:5cf5:4560::0000:0000:0001     fd0e:2146:5cf5:4560::1 \
+               fd0e:2146:5cf5:4560:0000:0000:0000:0001 fd0e:2146:5cf5:4560::1 \
                2001:0db8:0000:0000:0000:0000:0002:0001 2001:db8::2:1        \
                2001:0db8:0000:0001:0001:0001:0001:0001 2001:db8:0:1:1:1:1:1 \
                2001:0db8:0000:0000:0001:0000:0000:0001 2001:db8::1:0:0:1    \