kube-ps1: update to latest upstream version (c685ac8)

Closes #8009
Co-authored-by: Jon Mosco <jonny.mosco@gmail.com>

plugins/kube-ps1/README.md

-# Kubernetes prompt for zsh
+kube-ps1: Kubernetes prompt for bash and zsh
+============================================
 
-A Kubernetes zsh prompt that displays the current cluster cluster
-and the namespace.
+A script that lets you add the current Kubernetes context and namespace
+configured on `kubectl` to your Bash/Zsh prompt strings (i.e. the `$PS1`).
 
-Inspired by several tools used to simplify usage of kubectl
+Inspired by several tools used to simplify usage of `kubectl`.
 
-NOTE: If you are not using zsh, check out [kube-ps1](https://github.com/jonmosco/kube-ps1)
-designed for bash as well as zsh.
+![prompt](img/screenshot2.png)
 
-## Requirements
-
-The default prompt assumes you have the kubectl command line utility installed.  It
-can be obtained here:
+![prompt_sol_light](img/screenshot-sol-light.png)
 
-[Install and Set up kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/)
+![prompt_img](img/screenshot-img.png)
 
-If using this with OpenShift, the oc tool needs installed.  It can be obtained from here:
+![prompt demo](img/kube-ps1.gif)
 
-[OC Client Tools](https://www.openshift.org/download.html)
+## Installing
 
-## Helper utilities
+### MacOS
 
-There are several great tools that make using kubectl very enjoyable.
+Homebrew package manager:
 
-[kubectx and kubenx](https://github.com/ahmetb/kubectx) are great for
-fast switching between clusters and namespaces.
+```
+$ brew update
+$ brew install kube-ps1
+```
+### From Source
 
-## Prompt Structure
+1. Clone this repository
+2. Source the kube-ps1.sh in your `~/.zshrc` or your `~/.bashrc`
 
-The prompt layout is:
+### Arch Linux
+AUR Package available at [https://aur.archlinux.org/packages/kube-ps1/](https://aur.archlinux.org/packages/kube-ps1/).
 
+#### Zsh
+```sh
+source /path/to/kube-ps1.sh
+PROMPT='$(kube_ps1)'$PROMPT
 ```
-(<symbol>|<cluster>:<namespace>)
+#### Bash
+```sh
+source /path/to/kube-ps1.sh
+PS1='[\u@\h \W $(kube_ps1)]\$ '
 ```
 
-## Enabling
+### Zsh Plugin Managers
 
-In order to use kube-ps1 with Oh My Zsh, you'll need to enable them in the
-.zshrc file. You'll find the zshrc file in your $HOME directory. Open it with
-your favorite text editor and you'll see a spot to list all the plugins you
-want to load.
+#### Using [zplugin](https://github.com/zdharma/zplugin)
 
-```shell
-vim $HOME/.zshrc
+Update `.zshrc` with:
+```sh
+zplugin light jonmosco/kube-ps1
+PROMPT='$(kube_ps1)'$PROMPT
 ```
 
-Add kube-ps1 to the list of enabled plugins and enable it on the prompt:
+## Requirements
 
-```shell
-plugins=(
-  git
-  kube-ps1
-)
+The default prompt assumes you have the `kubectl` command line utility installed.
+Official installation instructions and binaries are available:
 
-# After the "source Oh My Zsh" line
-PROMPT=$PROMPT'$(kube_ps1) '
-# Or in double quotes, don't forget to escape
-PROMPT=$PROMPT"\$(kube_ps1) "
+[Install and Set up kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/)
+
+If using this with OpenShift, the `oc` tool needs installed.  It can be obtained
+from brew ports:
+
+```
+brew install openshift-cli
 ```
+or the source can be downloaded:
+
+[OC Client Tools](https://www.openshift.org/download.html)
 
-Note: The `PROMPT` example above was tested with the theme `robbyrussell`.
+Set the binary to `oc` with the following environment variable:
 
-## Enabling / Disabling on the current shell
+```
+KUBE_PS1_BINARY=oc
+```
 
-Sometimes the kubernetes information can be anoying, you can easily 
-switch it on and off with the following commands:
+If neither binary is available, the prompt will print the following:
 
-```shell
-kubeon
 ```
+(<symbol>|BINARY-N/A:N/A)
+```
+
+## Helper utilities
+
+There are several great tools that make using kubectl very enjoyable:
+
+- [`kubectx` and `kubens`](https://github.com/ahmetb/kubectx) are great for
+fast switching between clusters and namespaces.
+
+## Tmux port
+
+I have begun porting kube-ps1 to tmux as a status line plugin.  If you prefer
+tmux, and like the functionality provided by kube-ps1, checkout the
+[kube-tmux](https://github.com/jonmosco/kube-tmux) project
+
+## Prompt Structure
+
+The default prompt layout is:
 
-```shell
-kubeoff
+```
+(<symbol>|<context>:<namespace>)
 ```
 
-## Colors
+If the current-context is not set, kube-ps1 will return the following:
 
-Blue was used as the prefix to match the Kubernetes color as closely as
-possible. Red was chosen as the cluster name to stand out, and cyan
-for the namespace. Check the customization section for changing them.
+```
+(<symbol>|N/A:N/A)
+```
+
+## Enabling/Disabling
+
+If you want to stop showing Kubernetes status on your prompt string temporarily
+run `kubeoff`. To disable the prompt for all shell sessions, run `kubeoff -g`.
+You can enable it again in the current shell by running `kubeon`, and globally
+with `kubeon -g`.
+
+```
+kubeon     : turn on kube-ps1 status for this shell.  Takes precedence over
+             global setting for current session
+kubeon -g  : turn on kube-ps1 status globally
+kubeoff    : turn off kube-ps1 status for this shell. Takes precedence over
+             global setting for current session
+kubeoff -g : turn off kube-ps1 status globally
+```
 
 ## Customization
 
-The default settings can be overridden in ~/.zshrc
+The default settings can be overridden in `~/.bashrc` or `~/.zshrc` by setting
+the following environment variables:
 
 | Variable | Default | Meaning |
 | :------- | :-----: | ------- |
 | `KUBE_PS1_BINARY` | `kubectl` | Default Kubernetes binary |
+| `KUBE_PS1_NS_ENABLE` | `true` | Display the namespace. If set to `false`, this will also disable `KUBE_PS1_DIVIDER` |
 | `KUBE_PS1_PREFIX` | `(` | Prompt opening character  |
 | `KUBE_PS1_SYMBOL_ENABLE` | `true ` | Display the prompt Symbol. If set to `false`, this will also disable `KUBE_PS1_SEPARATOR` |
 | `KUBE_PS1_SYMBOL_DEFAULT` | `⎈ ` | Default prompt symbol. Unicode `\u2388` |
 | `KUBE_PS1_SYMBOL_USE_IMG` | `false` | ☸️  ,  Unicode `\u2638` as the prompt symbol |
-| `KUBE_PS1_NS_ENABLE` | `true` | Display the namespace. If set to `false`, this will also disable `KUBE_PS1_DIVIDER` |
-| `KUBE_PS1_SEPERATOR` | `\|` | Separator between symbol and cluster name |
-| `KUBE_PS1_DIVIDER` | `:` | Separator between cluster and namespace |
+| `KUBE_PS1_SEPARATOR` | &#124; | Separator between symbol and context name |
+| `KUBE_PS1_DIVIDER` | `:` | Separator between context and namespace |
 | `KUBE_PS1_SUFFIX` | `)` | Prompt closing character |
-| `KUBE_PS1_COLOR_SYMBOL` | `"%F{blue}"` | Custom color for the symbol |
-| `KUBE_PS1_COLOR_CONTEXT` | `"%F{red}"` | Custom color for the context |
-| `KUBE_PS1_COLOR_NS` | `"%F{cyan}"` | Custom color for the namespace |
-| `KUBE_PS1_ENABLED` | `true` | Set to false to start disabled on any new shell, `kubeon`/`kubeoff` will flip this value on the current shell |
+| `KUBE_PS1_CLUSTER_FUNCTION` | No default, must be user supplied | Function to customize how cluster is displayed |
+| `KUBE_PS1_NAMESPACE_FUNCTION` | No default, must be user supplied | Function to customize how namespace is displayed |
+
+For terminals that do not support UTF-8, the symbol will be replaced with the
+string `k8s`.
+
+To disable a feature, set it to an empty string:
+
+```
+KUBE_PS1_SEPARATOR=''
+```
+
+## Colors
+
+The default colors are set with the following environment variables:
+
+| Variable | Default | Meaning |
+| :------- | :-----: | ------- |
+| `KUBE_PS1_SYMBOL_COLOR` | `blue` | Set default color of the Kubernetes symbol |
+| `KUBE_PS1_CTX_COLOR` | `red` | Set default color of the context |
+| `KUBE_PS1_NS_COLOR` | `cyan` | Set default color of the namespace |
+| `KUBE_PS1_BG_COLOR` | `null` | Set default color of the prompt background |
+
+Blue was used for the default symbol to match the Kubernetes color as closely
+as possible. Red was chosen as the context name to stand out, and cyan for the
+namespace.
+
+Set the variable to an empty string if you do not want color for each
+prompt section:
+
+```
+KUBE_PS1_CTX_COLOR=''
+```
+
+Names are usable for the following colors:
+
+```
+black, red, green, yellow, blue, magenta, cyan
+```
+
+256 colors are available by specifying the numerical value as the variable
+argument.
+
+## Customize display of cluster name and namespace
+
+You can change how the cluster name and namespace are displayed using the
+`KUBE_PS1_CLUSTER_FUNCTION` and `KUBE_PS1_NAMESPACE_FUNCTION` variables
+respectively.
+
+For the following examples let's assume the following:
+
+cluster name: `sandbox.k8s.example.com`
+namespace: `alpha`
+
+If you're using domain style cluster names, your prompt will get quite long
+very quickly. Let's say you only want to display the first portion of the
+cluster name (`sandbox`), you could do that by adding the following:
+
+```sh
+function get_cluster_short() {
+  echo "$1" | cut -d . -f1
+}
+
+KUBE_PS1_CLUSTER_FUNCTION=get_cluster_short
+```
+
+The same pattern can be followed to customize the display of the namespace.
+Let's say you would prefer the namespace to be displayed in all uppercase
+(`ALPHA`), here's one way you could do that:
+
+```sh
+function get_namespace_upper() {
+    echo "$1" | tr '[:lower:]' '[:upper:]'
+}
+
+export KUBE_PS1_NAMESPACE_FUNCTION=get_namespace_upper
+```
+
+In both cases, the variable is set to the name of the function, and you must have defined the function in your shell configuration before kube_ps1 is called. The function must accept a single parameter and echo out the final value.
+
+### Bug Reports and shell configuration
+
+Due to the vast ways of customizing the shell, please try the prompt with a
+minimal configuration before submitting a bug report.
+
+This can be done as follows for each shell before loading kube-ps1:
+
+Bash:
+```bash
+bash --norc
+```
+
+Zsh:
+```bash
+zsh -f
+or
+zsh --no-rcs
+```
 
 ## Contributors
 
-- Jared Yanovich
-- Pedro Moranga
+* [Ahmet Alp Balkan](https://github.com/ahmetb)
+* Jared Yanovich

plugins/kube-ps1/kube-ps1.plugin.zsh

-#!/bin/zsh
+#!/bin/bash
 
 # Kubernetes prompt helper for bash/zsh
-# ported to oh-my-zsh
 # Displays current context and namespace
 
-# Copyright 2018 Jon Mosco
+# Copyright 2019 Jon Mosco
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
-#     https://www.apache.org/licenses/LICENSE-2.0
+#     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ -21,39 +20,150 @@
 # Debug
 [[ -n $DEBUG ]] && set -x
 
-setopt PROMPT_SUBST
-autoload -U add-zsh-hook
-add-zsh-hook precmd _kube_ps1_update_cache
-zmodload zsh/stat
-zmodload zsh/datetime
-
 # Default values for the prompt
-# Override these values in ~/.zshrc
+# Override these values in ~/.zshrc or ~/.bashrc
 KUBE_PS1_BINARY="${KUBE_PS1_BINARY:-kubectl}"
 KUBE_PS1_SYMBOL_ENABLE="${KUBE_PS1_SYMBOL_ENABLE:-true}"
-KUBE_PS1_SYMBOL_DEFAULT="${KUBE_PS1_SYMBOL_DEFAULT:-\u2388 }"
+KUBE_PS1_SYMBOL_DEFAULT=${KUBE_PS1_SYMBOL_DEFAULT:-$'\u2388 '}
 KUBE_PS1_SYMBOL_USE_IMG="${KUBE_PS1_SYMBOL_USE_IMG:-false}"
 KUBE_PS1_NS_ENABLE="${KUBE_PS1_NS_ENABLE:-true}"
+KUBE_PS1_CONTEXT_ENABLE="${KUBE_PS1_CONTEXT_ENABLE:-true}"
+KUBE_PS1_PREFIX="${KUBE_PS1_PREFIX-(}"
 KUBE_PS1_SEPARATOR="${KUBE_PS1_SEPARATOR-|}"
 KUBE_PS1_DIVIDER="${KUBE_PS1_DIVIDER-:}"
-KUBE_PS1_PREFIX="${KUBE_PS1_PREFIX-(}"
 KUBE_PS1_SUFFIX="${KUBE_PS1_SUFFIX-)}"
+KUBE_PS1_SYMBOL_COLOR="${KUBE_PS1_SYMBOL_COLOR-blue}"
+KUBE_PS1_CTX_COLOR="${KUBE_PS1_CTX_COLOR-red}"
+KUBE_PS1_NS_COLOR="${KUBE_PS1_NS_COLOR-cyan}"
+KUBE_PS1_BG_COLOR="${KUBE_PS1_BG_COLOR}"
+KUBE_PS1_KUBECONFIG_CACHE="${KUBECONFIG}"
+KUBE_PS1_DISABLE_PATH="${HOME}/.kube/kube-ps1/disabled"
 KUBE_PS1_LAST_TIME=0
-KUBE_PS1_ENABLED=true
+KUBE_PS1_CLUSTER_FUNCTION="${KUBE_PS1_CLUSTER_FUNCTION}"
+KUBE_PS1_NAMESPACE_FUNCTION="${KUBE_PS1_NAMESPACE_FUNCTION}"
+
+# Determine our shell
+if [ "${ZSH_VERSION-}" ]; then
+  KUBE_PS1_SHELL="zsh"
+elif [ "${BASH_VERSION-}" ]; then
+  KUBE_PS1_SHELL="bash"
+fi
+
+_kube_ps1_init() {
+  [[ -f "${KUBE_PS1_DISABLE_PATH}" ]] && KUBE_PS1_ENABLED=off
+
+  case "${KUBE_PS1_SHELL}" in
+    "zsh")
+      _KUBE_PS1_OPEN_ESC="%{"
+      _KUBE_PS1_CLOSE_ESC="%}"
+      _KUBE_PS1_DEFAULT_BG="%k"
+      _KUBE_PS1_DEFAULT_FG="%f"
+      setopt PROMPT_SUBST
+      autoload -U add-zsh-hook
+      add-zsh-hook precmd _kube_ps1_update_cache
+      zmodload -F zsh/stat b:zstat
+      zmodload zsh/datetime
+      ;;
+    "bash")
+      _KUBE_PS1_OPEN_ESC=$'\001'
+      _KUBE_PS1_CLOSE_ESC=$'\002'
+      _KUBE_PS1_DEFAULT_BG=$'\033[49m'
+      _KUBE_PS1_DEFAULT_FG=$'\033[39m'
+      [[ $PROMPT_COMMAND =~ _kube_ps1_update_cache ]] || PROMPT_COMMAND="_kube_ps1_update_cache;${PROMPT_COMMAND:-:}"
+      ;;
+  esac
+}
+
+_kube_ps1_color_fg() {
+  local KUBE_PS1_FG_CODE
+  case "${1}" in
+    black) KUBE_PS1_FG_CODE=0;;
+    red) KUBE_PS1_FG_CODE=1;;
+    green) KUBE_PS1_FG_CODE=2;;
+    yellow) KUBE_PS1_FG_CODE=3;;
+    blue) KUBE_PS1_FG_CODE=4;;
+    magenta) KUBE_PS1_FG_CODE=5;;
+    cyan) KUBE_PS1_FG_CODE=6;;
+    white) KUBE_PS1_FG_CODE=7;;
+    # 256
+    [0-9]|[1-9][0-9]|[1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-6]) KUBE_PS1_FG_CODE="${1}";;
+    *) KUBE_PS1_FG_CODE=default
+  esac
+
+  if [[ "${KUBE_PS1_FG_CODE}" == "default" ]]; then
+    KUBE_PS1_FG_CODE="${_KUBE_PS1_DEFAULT_FG}"
+    return
+  elif [[ "${KUBE_PS1_SHELL}" == "zsh" ]]; then
+    KUBE_PS1_FG_CODE="%F{$KUBE_PS1_FG_CODE}"
+  elif [[ "${KUBE_PS1_SHELL}" == "bash" ]]; then
+    if tput setaf 1 &> /dev/null; then
+      KUBE_PS1_FG_CODE="$(tput setaf ${KUBE_PS1_FG_CODE})"
+    elif [[ $KUBE_PS1_FG_CODE -ge 0 ]] && [[ $KUBE_PS1_FG_CODE -le 256 ]]; then
+      KUBE_PS1_FG_CODE="\033[38;5;${KUBE_PS1_FG_CODE}m"
+    else
+      KUBE_PS1_FG_CODE="${_KUBE_PS1_DEFAULT_FG}"
+    fi
+  fi
+  echo ${_KUBE_PS1_OPEN_ESC}${KUBE_PS1_FG_CODE}${_KUBE_PS1_CLOSE_ESC}
+}
+
+_kube_ps1_color_bg() {
+  local KUBE_PS1_BG_CODE
+  case "${1}" in
+    black) KUBE_PS1_BG_CODE=0;;
+    red) KUBE_PS1_BG_CODE=1;;
+    green) KUBE_PS1_BG_CODE=2;;
+    yellow) KUBE_PS1_BG_CODE=3;;
+    blue) KUBE_PS1_BG_CODE=4;;
+    magenta) KUBE_PS1_BG_CODE=5;;
+    cyan) KUBE_PS1_BG_CODE=6;;
+    white) KUBE_PS1_BG_CODE=7;;
+    # 256
+    [0-9]|[1-9][0-9]|[1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-6]) KUBE_PS1_BG_CODE="${1}";;
+    *) KUBE_PS1_BG_CODE=$'\033[0m';;
+  esac
 
-KUBE_PS1_COLOR_SYMBOL="%{$fg[blue]%}"
-KUBE_PS1_COLOR_CONTEXT="%{$fg[red]%}"
-KUBE_PS1_COLOR_NS="%{$fg[cyan]%}"
+  if [[ "${KUBE_PS1_BG_CODE}" == "default" ]]; then
+    KUBE_PS1_FG_CODE="${_KUBE_PS1_DEFAULT_BG}"
+    return
+  elif [[ "${KUBE_PS1_SHELL}" == "zsh" ]]; then
+    KUBE_PS1_BG_CODE="%K{$KUBE_PS1_BG_CODE}"
+  elif [[ "${KUBE_PS1_SHELL}" == "bash" ]]; then
+    if tput setaf 1 &> /dev/null; then
+      KUBE_PS1_BG_CODE="$(tput setab ${KUBE_PS1_BG_CODE})"
+    elif [[ $KUBE_PS1_BG_CODE -ge 0 ]] && [[ $KUBE_PS1_BG_CODE -le 256 ]]; then
+      KUBE_PS1_BG_CODE="\033[48;5;${KUBE_PS1_BG_CODE}m"
+    else
+      KUBE_PS1_BG_CODE="${DEFAULT_BG}"
+    fi
+  fi
+  echo ${OPEN_ESC}${KUBE_PS1_BG_CODE}${CLOSE_ESC}
+}
 
 _kube_ps1_binary_check() {
-  command -v "$1" >/dev/null
+  command -v $1 >/dev/null
 }
 
 _kube_ps1_symbol() {
   [[ "${KUBE_PS1_SYMBOL_ENABLE}" == false ]] && return
 
+  case "${KUBE_PS1_SHELL}" in
+    bash)
+      if ((BASH_VERSINFO[0] >= 4)) && [[ $'\u2388 ' != "\\u2388 " ]]; then
         KUBE_PS1_SYMBOL="${KUBE_PS1_SYMBOL_DEFAULT}"
-  KUBE_PS1_SYMBOL_IMG="\u2638 "
+        # KUBE_PS1_SYMBOL=$'\u2388 '
+        KUBE_PS1_SYMBOL_IMG=$'\u2638 '
+      else
+        KUBE_PS1_SYMBOL=$'\xE2\x8E\x88 '
+        KUBE_PS1_SYMBOL_IMG=$'\xE2\x98\xB8 '
+      fi
+      ;;
+    zsh)
+      KUBE_PS1_SYMBOL="${KUBE_PS1_SYMBOL_DEFAULT}"
+      KUBE_PS1_SYMBOL_IMG="\u2638 ";;
+    *)
+      KUBE_PS1_SYMBOL="k8s"
+  esac
 
   if [[ "${KUBE_PS1_SYMBOL_USE_IMG}" == true ]]; then
     KUBE_PS1_SYMBOL="${KUBE_PS1_SYMBOL_IMG}"
@@ -73,22 +183,24 @@ _kube_ps1_file_newer_than() {
   local file=$1
   local check_time=$2
 
-  zmodload -e "zsh/stat"
-  if [[ "$?" -eq 0 ]]; then
-    mtime=$(stat +mtime "${file}")
+  if [[ "${KUBE_PS1_SHELL}" == "zsh" ]]; then
+    mtime=$(zstat -L +mtime "${file}")
   elif stat -c "%s" /dev/null &> /dev/null; then
     # GNU stat
-    mtime=$(stat -c %Y "${file}")
+    mtime=$(stat -L -c %Y "${file}")
   else
     # BSD stat
-    mtime=$(stat -f %m "$file")
+    mtime=$(stat -L -f %m "$file")
   fi
 
   [[ "${mtime}" -gt "${check_time}" ]]
 }
 
 _kube_ps1_update_cache() {
-  KUBECONFIG="${KUBECONFIG:=$HOME/.kube/config}"
+  local return_code=$?
+
+  [[ "${KUBE_PS1_ENABLED}" == "off" ]] && return $return_code
+
   if ! _kube_ps1_binary_check "${KUBE_PS1_BINARY}"; then
     # No ability to fetch context/namespace; display N/A.
     KUBE_PS1_CONTEXT="BINARY-N/A"
@@ -113,47 +225,147 @@ _kube_ps1_update_cache() {
       return
     fi
   done
+
+  return $return_code
 }
 
-_kube_ps1_get_context_ns() {
+_kube_ps1_get_context() {
+  if [[ "${KUBE_PS1_CONTEXT_ENABLE}" == true ]]; then
+    KUBE_PS1_CONTEXT="$(${KUBE_PS1_BINARY} config current-context 2>/dev/null)"
+    # Set namespace to 'N/A' if it is not defined
+    KUBE_PS1_CONTEXT="${KUBE_PS1_CONTEXT:-N/A}"
 
-  # Set the command time
-  KUBE_PS1_LAST_TIME=$EPOCHSECONDS
+    if [[ ! -z "${KUBE_PS1_CLUSTER_FUNCTION}" ]]; then
+      KUBE_PS1_CONTEXT=$($KUBE_PS1_CLUSTER_FUNCTION $KUBE_PS1_CONTEXT)
+    fi
+  fi
+}
 
-  KUBE_PS1_CONTEXT="$(${KUBE_PS1_BINARY} config current-context 2>/dev/null)"
-  if [[ -z "${KUBE_PS1_CONTEXT}" ]]; then
-    KUBE_PS1_CONTEXT="N/A"
-    KUBE_PS1_NAMESPACE="N/A"
-    return
-  elif [[ "${KUBE_PS1_NS_ENABLE}" == true ]]; then
+_kube_ps1_get_ns() {
+  if [[ "${KUBE_PS1_NS_ENABLE}" == true ]]; then
     KUBE_PS1_NAMESPACE="$(${KUBE_PS1_BINARY} config view --minify --output 'jsonpath={..namespace}' 2>/dev/null)"
     # Set namespace to 'default' if it is not defined
     KUBE_PS1_NAMESPACE="${KUBE_PS1_NAMESPACE:-default}"
+
+    if [[ ! -z "${KUBE_PS1_NAMESPACE_FUNCTION}" ]]; then
+        KUBE_PS1_NAMESPACE=$($KUBE_PS1_NAMESPACE_FUNCTION $KUBE_PS1_NAMESPACE)
+    fi
   fi
 }
 
-# function to disable the prompt on the current shell
-kubeon(){
-  KUBE_PS1_ENABLED=true
+_kube_ps1_get_context_ns() {
+  # Set the command time
+  if [[ "${KUBE_PS1_SHELL}" == "bash" ]]; then
+    if ((BASH_VERSINFO[0] >= 4 && BASH_VERSINFO[1] >= 2)); then
+      KUBE_PS1_LAST_TIME=$(printf '%(%s)T')
+    else
+      KUBE_PS1_LAST_TIME=$(date +%s)
+    fi
+  elif [[ "${KUBE_PS1_SHELL}" == "zsh" ]]; then
+    KUBE_PS1_LAST_TIME=$EPOCHSECONDS
+  fi
+
+  _kube_ps1_get_context
+  _kube_ps1_get_ns
+}
+
+# Set kube-ps1 shell defaults
+_kube_ps1_init
+
+_kubeon_usage() {
+  cat <<"EOF"
+Toggle kube-ps1 prompt on
+
+Usage: kubeon [-g | --global] [-h | --help]
+
+With no arguments, turn off kube-ps1 status for this shell instance (default).
+
+  -g --global  turn on kube-ps1 status globally
+  -h --help    print this message
+EOF
+}
+
+_kubeoff_usage() {
+  cat <<"EOF"
+Toggle kube-ps1 prompt off
+
+Usage: kubeoff [-g | --global] [-h | --help]
+
+With no arguments, turn off kube-ps1 status for this shell instance (default).
+
+  -g --global turn off kube-ps1 status globally
+  -h --help   print this message
+EOF
+}
+
+kubeon() {
+  if [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
+    _kubeon_usage
+  elif [[ "${1}" == '-g' || "${1}" == '--global' ]]; then
+    rm -f -- "${KUBE_PS1_DISABLE_PATH}"
+  elif [[ "$#" -ne 0 ]]; then
+    echo -e "error: unrecognized flag ${1}\\n"
+    _kubeon_usage
+    return
+  fi
+
+  KUBE_PS1_ENABLED=on
 }
 
-# function to disable the prompt on the current shell
-kubeoff(){
-  KUBE_PS1_ENABLED=false
+kubeoff() {
+  if [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
+    _kubeoff_usage
+  elif [[ "${1}" == '-g' || "${1}" == '--global' ]]; then
+    mkdir -p -- "$(dirname "${KUBE_PS1_DISABLE_PATH}")"
+    touch -- "${KUBE_PS1_DISABLE_PATH}"
+  elif [[ $# -ne 0 ]]; then
+    echo "error: unrecognized flag ${1}" >&2
+    _kubeoff_usage
+    return
+  fi
+
+  KUBE_PS1_ENABLED=off
 }
 
 # Build our prompt
-kube_ps1 () {
-  local reset_color="%{$reset_color%}"
-  [[ ${KUBE_PS1_ENABLED} != 'true' ]] && return
-
-  KUBE_PS1="${reset_color}$KUBE_PS1_PREFIX"
-  KUBE_PS1+="${KUBE_PS1_COLOR_SYMBOL}$(_kube_ps1_symbol)"
-  KUBE_PS1+="${reset_color}$KUBE_PS1_SEPERATOR"
-  KUBE_PS1+="${KUBE_PS1_COLOR_CONTEXT}$KUBE_PS1_CONTEXT${reset_color}"
-  KUBE_PS1+="$KUBE_PS1_DIVIDER"
-  KUBE_PS1+="${KUBE_PS1_COLOR_NS}$KUBE_PS1_NAMESPACE${reset_color}"
-  KUBE_PS1+="$KUBE_PS1_SUFFIX"
+kube_ps1() {
+  [[ "${KUBE_PS1_ENABLED}" == "off" ]] && return
+  [[ -z "${KUBE_PS1_CONTEXT}" ]] && [[ "${KUBE_PS1_CONTEXT_ENABLE}" == true ]] && return
+
+  local KUBE_PS1
+  local KUBE_PS1_RESET_COLOR="${_KUBE_PS1_OPEN_ESC}${_KUBE_PS1_DEFAULT_FG}${_KUBE_PS1_CLOSE_ESC}"
+
+  # Background Color
+  [[ -n "${KUBE_PS1_BG_COLOR}" ]] && KUBE_PS1+="$(_kube_ps1_color_bg ${KUBE_PS1_BG_COLOR})"
+
+  # Prefix
+  [[ -n "${KUBE_PS1_PREFIX}" ]] && KUBE_PS1+="${KUBE_PS1_PREFIX}"
+
+  # Symbol
+  KUBE_PS1+="$(_kube_ps1_color_fg $KUBE_PS1_SYMBOL_COLOR)$(_kube_ps1_symbol)${KUBE_PS1_RESET_COLOR}"
+
+  if [[ -n "${KUBE_PS1_SEPARATOR}" ]] && [[ "${KUBE_PS1_SYMBOL_ENABLE}" == true ]]; then
+    KUBE_PS1+="${KUBE_PS1_SEPARATOR}"
+  fi
+
+  # Context
+  if [[ "${KUBE_PS1_CONTEXT_ENABLE}" == true ]]; then
+    KUBE_PS1+="$(_kube_ps1_color_fg $KUBE_PS1_CTX_COLOR)${KUBE_PS1_CONTEXT}${KUBE_PS1_RESET_COLOR}"
+  fi
+
+  # Namespace
+  if [[ "${KUBE_PS1_NS_ENABLE}" == true ]]; then
+    if [[ -n "${KUBE_PS1_DIVIDER}" ]] && [[ "${KUBE_PS1_CONTEXT_ENABLE}" == true ]]; then
+      KUBE_PS1+="${KUBE_PS1_DIVIDER}"
+    fi
+    KUBE_PS1+="$(_kube_ps1_color_fg ${KUBE_PS1_NS_COLOR})${KUBE_PS1_NAMESPACE}${KUBE_PS1_RESET_COLOR}"
+  fi
+
+  # Suffix
+  [[ -n "${KUBE_PS1_SUFFIX}" ]] && KUBE_PS1+="${KUBE_PS1_SUFFIX}"
+
+  # Close Background color if defined
+  [[ -n "${KUBE_PS1_BG_COLOR}" ]] && KUBE_PS1+="${_KUBE_PS1_OPEN_ESC}${_KUBE_PS1_DEFAULT_BG}${_KUBE_PS1_CLOSE_ESC}"
 
   echo "${KUBE_PS1}"
 }