chns

#!/bin/bash
set -eo pipefail

# Fuzzy matches namespace names in the current context for fast namespace switching
# E.g. if "my-hackdays-app-3949-production" is the only app with "hackdays" in the current context,
# `chns hackdays` will switch to it
# Author: Katrina Verey (github.com/KnVerey)

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

if ! [ "$(kubectl get namespace ${NAMESPACE} 2>/dev/null)" ]; then
  ALL_NAMESPACES=$(kubectl get namespaces -o=custom-columns=NAME:.metadata.name --no-headers)
  GUESSES=$(echo "$ALL_NAMESPACES" | grep $NAMESPACE) || true
  NUM_GUESSES=$(echo "$GUESSES" | wc -w)

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

CONTEXT=$(kubectl config current-context)
kubectl config set-context $CONTEXT --namespace=$NAMESPACE >/dev/null
echo "Namespace $NAMESPACE set"