kctx

#!/usr/bin/env bash
set -euo pipefail

# Check for required dependencies
for dep in fzf kubectl; do
  command -v "$dep" >/dev/null 2>&1 || {
    printf "Missing dependency: %s :(\n" "$dep" >&2
    exit 1
  }
done

# It's a simple script, print a simple help please
usage() {
  printf '%s\n' "Usage: ${0##*/} [-c] [-h] [-l] [-u] [context name]

FLAGS
    -c, --current   Show current context
    -h, --help      Print help
    -l, --list      List all contexts
    -u, --unset     Set default context" 1>&2
  exit 3
}

# Check for currently set context, fallback to None if unset
current_context=$(kubectl config current-context 2>/dev/null || printf "None\n")

# Set starting fzf options
FZF_DEFAULT_OPTS="$FZF_DEFAULT_OPTS --cycle \
                                    --reverse \
                                    --info=inline \
                                    --height=20% \
                                    --prompt=\"⎈ context[$current_context] > \""

case $# in
0)
  kubectl config use-context "$(kubectl config get-contexts -o name | fzf)"
  ;;
1)
  case "$1" in
  "-c" | "--current")
    kubectl config current-context
    ;;
  "-l" | "--list")
    kubectl config get-contexts -o name
    ;;
  "-u" | "--unset")
    kubectl config unset current-context
    ;;
  "-h" | "--help")
    usage
    ;;
  *)
    needle=$(printf '.*%s' "$(printf '%s' "$@" |
      sed -E 's/ +//g' |
      sed -E 's/(.)/\1.*/g')")
    kubectl config use-context "$(kubectl config get-contexts -o name |
      grep "$needle"'[^/]*$' |
      fzf -1 -0 -q "$@")"
    ;;
  esac
  ;;
*) usage ;;
esac