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;;; oni-helpers.el --- Helper functions for Emacs init -*- lexical-binding: t; -*-
;; Copyright (C) 2016 Tom Willemse
;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords: convenience
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Helpers for my Emacs init.
;;; Code:
(defmacro silently (title &rest body)
"Only output something when an error occurs.
Prefix with TITLE any output that occurs while executing BODY,
but only when an error occurs, otherwise discard it."
(declare (indent 1))
(let ((buffer-var (cl-gensym))
(error-var (cl-gensym)))
`(with-temp-buffer
(let ((,buffer-var (current-buffer)))
(cl-letf (((symbol-function 'message)
(lambda (msg &rest args)
(with-current-buffer ,buffer-var
(insert " " (apply 'format msg args) "\n")))))
(condition-case ,error-var
(progn ,@body)
(error
(princ ,(concat title " output:\n"))
(princ (with-current-buffer ,buffer-var (buffer-string)))
(princ "Error:\n")
(princ " ")
(princ (cadr ,error-var))
(princ "\n"))))))))
(defun oni:data-location (file-name)
"Return the location of FILE-NAME within my data directory.
This is currently the data directory under the
`user-emacs-directory'."
(concat user-emacs-directory "data/" file-name))
(with-eval-after-load 'ert
(ert-deftest oni:data-location ()
"Test that `oni:data-location' returns the correct locations."
(should (string= "~/.emacs.d/data/backup-files/"
(oni:data-location "backup-files/")))
(should (string= "~/.emacs.d/data/auto-save-files/"
(oni:data-location "auto-save-files/")))
(should (string= "~/.emacs.d/data/auto-save-list/.saves-"
(oni:data-location "auto-save-list/.saves-")))))
(provide 'oni-helpers)
;;; oni-helpers.el ends here
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