Fish helpers to handle with gcloud config

completions-gswitch.fish

# ~/.config/completions/gswitch.fish
#
# creates a variable with the name of gcloud named configurations. Ex.:
# 
# ~ glist
# NAME               IS_ACTIVE  ACCOUNT                     PROJECT
# aluminium          False      [email protected]       aluminium-123
# nickel             True       [email protected]          nickel-001
# zinc               False      [email protected]                  zinc-project
#
# echo $project
# > aluminium nickel zinc
set -l projects (glist | tail -n +2 | awk '{print $1}')

# autocomplete function gswitch based on $projects variable
# https://fishshell.com/docs/current/index.html#completion
complete -c gswitch -x -a '$projects'

glist.fish

# ~/.config/functions/glist.fish
function glist -d 'List gcloud named configurations'
  gcloud config configurations list
end

gswitch.fish

# ~/.config/functions/gswitch.fish
function gswitch -d 'Switch between gcloud configurations'
  gcloud config configurations activate $argv
end

Command reference

https://cloud.google.com/sdk/gcloud/reference/config/configurations