chctx

#!/bin/zsh#!/bin/bash
set -eo pipefail

# Fuzzy matches available kubernetes context names for fast context switching
# E.g. if "my-context2" is the only context with "2" in its name, `chctx 2` will switch to it
# Optional second argument to switch namespace at the same time using chns
# Author: Katrina Verey (github.com/KnVerey)

# Suggestion: Add the following to your zshrc and install the completions
# To get fast namespace listing and switching via context names
# Warning: Think through your context names first. E.g. if you're using minikube, you'll need to exclude or unalias it
# or else you'll have a conflict with the executable
#
# local contexts; contexts=($(kubectl config get-contexts -o name))
# for context in $contexts; do
#   alias $context="chctx $context"
# done
#

if [ $1 ]; then
  CONTEXT=$1
else
  name=`basename "$0"`
  echo "Usage: $name CONTEXT [NAMESPACE]"
  exit 1;
fi

if ! [ "$(kubectl config get-contexts ${CONTEXT} -o name 2>/dev/null)" ]; then
  ALL_CONTEXTS=$(kubectl config get-contexts -o name)
  GUESSES=$(echo "$ALL_CONTEXTS" | grep $CONTEXT) || true
  NUM_GUESSES=$(echo "$GUESSES" | wc -w)

  if [ $NUM_GUESSES -eq 1 ]; then
    CONTEXT=$GUESSES
  elif [ $NUM_GUESSES -gt 1 ]; then
    echo -e "\033[0;35mName '$CONTEXT' is ambiguous. Matching contexts:\033[0m"
    echo "$GUESSES"
    exit 1;
  else
    echo -e "\033[0;31mString '$CONTEXT' does not match any available context.\033[0m"
    exit 1;
  fi
fi

kubectl config use-context $CONTEXT

if [ $2 ]; then
  chns $2
fi