From 3ce06883a700ff03d4db6307ae807a430d42e585 Mon Sep 17 00:00:00 2001
From: Pavle Portic <git@theedgeofrage.com>
Date: Mon, 18 Apr 2022 12:05:43 +0200
Subject: [PATCH] Add kc script for kubectl context switching

---
 dot_local/bin/executable_kc | 128 ++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 dot_local/bin/executable_kc

diff --git a/dot_local/bin/executable_kc b/dot_local/bin/executable_kc
new file mode 100644
index 0000000..7757ed4
--- /dev/null
+++ b/dot_local/bin/executable_kc
@@ -0,0 +1,128 @@
+#!/usr/bin/env bash
+
+[[ -n $DEBUG ]] && set -x
+
+set -eou pipefail
+IFS=$'\n\t'
+
+
+usage() {
+  local SELF
+  SELF="kc"
+
+  cat <<EOF
+USAGE:
+  $SELF                       : list the configs
+  $SELF <NAME>                : switch to context <NAME>
+  $SELF -c, --current         : show the current context name
+  $SELF -u, --unset           : unset the current context, better use: Ctrl+d
+
+  $SELF -h,--help             : show this message
+EOF
+}
+
+exit_err() {
+   echo >&2 "${1}"
+   exit 1
+}
+
+current_context() {
+  kubectl config view -o=jsonpath='{.current-context}'
+}
+
+get_configs() {
+  #kubectl config get-contexts -o=name | sort -n
+  ls -p --color=never -1 $HOME/.kube | grep -v '/$'
+}
+
+list_configs() {
+  set -u pipefail
+  local cur ctx_list
+  cur="$(current_context)" || exit_err "error getting current context"
+  ctx_list=$(get_configs) || exit_err "error getting context list"
+
+  local yellow darkbg normal
+  yellow=$(tput setaf 3 || true)
+  darkbg=$(tput setab 0 || true)
+  normal=$(tput sgr0 || true)
+
+  local cur_ctx_fg cur_ctx_bg
+  cur_ctx_fg=${KUBECTX_CURRENT_FGCOLOR:-$yellow}
+  cur_ctx_bg=${KUBECTX_CURRENT_BGCOLOR:-$darkbg}
+
+  for c in $ctx_list; do
+  if [[ -n "${_KUBECTX_FORCE_COLOR:-}" || \
+       -t 1 && -z "${NO_COLOR:-}" ]]; then
+    # colored output mode
+    if [[ "${c}" = "${cur}" ]]; then
+      echo "${cur_ctx_bg}${cur_ctx_fg}${c}${normal}"
+    else
+      echo "${c}"
+    fi
+  else
+    echo "${c}"
+  fi
+  done
+}
+
+choose_context_interactive() {
+  local choice
+  choice="$(get_configs | _KUBECTX_FORCE_COLOR=1 fzf --ansi --no-preview || true)"
+  if [[ -z "${choice}" ]]; then
+    echo 2>&1 "error: you did not choose any of the options"
+    exit 1
+  else
+    set_context "${choice}"
+  fi
+}
+
+set_context() {
+  echo "Set context to ${1}." >&2
+  export KUBECONFIG="$HOME/.kube/${1}"
+  echo -e "\n\nYou are in a subshell. Press Ctrl+d for exit!\n\n"
+  $SHELL
+}
+
+unset_context() {
+  echo "Unsetting current context." >&2
+  kubectl config unset current-context
+  echo "Ctrl+d for exiting subshell." >&2
+}
+
+main() {
+  if [[ "$#" -eq 0 ]]; then
+    if [[ -t 1 &&  -z "${KUBECTX_IGNORE_FZF:-}" && "$(type fzf &>/dev/null; echo $?)" -eq 0 ]]; then
+      choose_context_interactive
+    else
+      list_configs
+    fi
+  elif [[ "$#" -gt 1 ]]; then
+    echo "error: too many arguments" >&2
+    usage
+    exit 1
+  elif [[ "$#" -eq 1 ]]; then
+    if [[ "${1}" == "-" ]]; then
+      swap_context
+    elif [[ "${1}" == '-c' || "${1}" == '--current' ]]; then
+      # we don't call current_context here for two reasons:
+      # - it does not fail when current-context property is not set
+      # - it does not return a trailing newline
+      kubectl config current-context
+    elif [[ "${1}" == '-u' || "${1}" == '--unset' ]]; then
+      unset_context
+    elif [[ "${1}" == '-h' || "${1}" == '--help' ]]; then
+      usage
+    elif [[ "${1}" =~ ^-(.*) ]]; then
+      echo "error: unrecognized flag \"${1}\"" >&2
+      usage
+      exit 1
+    else
+      set_context "${1}"
+    fi
+  else
+    usage
+    exit 1
+  fi
+}
+
+main "$@"