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kubectx-mode.el
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kubectx-mode.el
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;;; kubectx-mode.el --- Change kubectl context/namespace and show in mode line -*- lexical-binding: t; -*-
;; Copyright (C) 2018-2023 Terje Sannum
;; Author: Terje Sannum <terje@offpiste.org>
;; Keywords: tools kubernetes
;; Version: 1.2.1
;; Package-Requires: ((emacs "24"))
;; URL: https://github.com/terjesannum/emacs-kubectx-mode
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; See https://github.com/terjesannum/emacs-kubectx-mode/blob/master/README.md
;;; Code:
(defvar kubectx-kubectl-command "kubectl" "Kubectl executable.")
(defvar kubectx-mode-line-update-timer nil)
(defvar kubectx-mode-line-string "")
(defvar kubectx-mode-line-update-interval 5 "Number of seconds between background mode-line updates.")
(defvar kubectx-mode-line-string-format " [kube:%C %N]" "String to display in mode-line (%C = context, %N = namespace).")
(defvar kubectx-mode-map
(let ((km (make-sparse-keymap)))
(define-key km (kbd "C-c C-k c") #'kubectx-set-context)
(define-key km (kbd "C-c C-k n") #'kubectx-set-namespace)
km)
"Keymap for `kubectx-mode'.")
(defun kubectx-run-kubectl-command (&rest args)
"Run kubectl command with ARGS."
(with-temp-buffer
(let ((default-directory "~"))
(if (and (executable-find kubectx-kubectl-command)
(= (apply #'call-process kubectx-kubectl-command nil t nil args) 0))
(replace-regexp-in-string "\n\\'" "" (buffer-string))
"n/a"))))
(defun kubectx-namespaces ()
"Get list of namespaces."
(split-string (kubectx-run-kubectl-command "get" "namespaces" "--output" "jsonpath={.items[*].metadata.name}")))
(defun kubectx-set-namespace (namespace)
"Set current kubectl namespace to NAMESPACE."
(interactive
(list
(completing-read "Namespace: " (kubectx-namespaces) nil t)))
(kubectx-run-kubectl-command "config" "set-context" "--current" (format "--namespace=%s" namespace))
(kubectx-mode-line-update))
(defun kubectx-contexts ()
"Get list of contexts."
(split-string (kubectx-run-kubectl-command "config" "get-contexts" "--output" "name")))
(defun kubectx-set-context (context)
"Set current kubectl context to CONTEXT."
(interactive
(list
(completing-read "Context: " (kubectx-contexts) nil t)))
(kubectx-run-kubectl-command "config" "use-context" context)
(kubectx-mode-line-update))
(defun kubectx-format-mode-line-string (context namespace)
"Create kubectx string with CONTEXT and NAMESPACE to display in mode-line."
(replace-regexp-in-string "%C" context (replace-regexp-in-string "%N" (or namespace "n/a") kubectx-mode-line-string-format t) t))
(defun kubectx-mode-line-update ()
"Update kubectx mode-line string with current context and namespace."
(interactive)
(let ((ctx (split-string (kubectx-run-kubectl-command "config" "view" "--minify" "--output" "jsonpath={.contexts[0].name} {...contexts[0].context.namespace}"))))
(setq kubectx-mode-line-string (kubectx-format-mode-line-string (car ctx) (cadr ctx)))
(force-mode-line-update t)))
;;;###autoload
(define-minor-mode kubectx-mode
"Switch kubernetes context and show info in the mode line."
:global t
:keymap kubectx-mode-map
(when kubectx-mode-line-update-timer (cancel-timer kubectx-mode-line-update-timer))
(if kubectx-mode
(progn
(unless global-mode-string (setq global-mode-string '("")))
(add-to-list 'global-mode-string 'kubectx-mode-line-string t)
(when (> kubectx-mode-line-update-interval 0)
(setq kubectx-mode-line-update-timer
(run-at-time nil kubectx-mode-line-update-interval
#'kubectx-mode-line-update)))
(kubectx-mode-line-update))
(setq global-mode-string
(delq 'kubectx-mode-line-string global-mode-string))))
(provide 'kubectx-mode)
;;; kubectx-mode.el ends here