git.shemshak.org - ~bandali/configs/blob - lisp/bandali-utils.el

   1 ;;; bandali-utils.el --- useful utilities            -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2020  Amin Bandali
   4
   5 ;; Author: Amin Bandali <bandali@gnu.org>
   6 ;; Keywords: lisp, tools
   7
   8 ;; This program is free software; you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation, either version 3 of the License, or
  11 ;; (at your option) any later version.
  12
  13 ;; This program is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
  20
  21 ;;; Commentary:
  22
  23 ;; A small collection of useful utilities used through my init files.
  24
  25 ;;; Code:
  26
  27 (defmacro b/setq-every (value &rest vars)
  28   "Set all the variables from VARS to value VALUE."
  29   (declare (indent defun) (debug t))
  30   `(progn ,@(mapcar (lambda (x) (list 'setq x value)) vars)))
  31
  32 (defun b/start-process (program &rest args)
  33   "Same as `start-process', but doesn't bother about name and buffer."
  34   (let ((process-name (concat program "_process"))
  35         (buffer-name  (generate-new-buffer-name
  36                        (concat program "_output"))))
  37     (apply #'start-process
  38            process-name buffer-name program args)))
  39
  40 (defun b/dired-start-process (program &optional args)
  41   "Open current file with a PROGRAM."
  42   ;; Shell command looks like this: "program [ARGS]... FILE" (ARGS can
  43   ;; be nil, so remove it).
  44   (declare-function dired-get-file-for-visit "dired")
  45   (apply #'b/start-process
  46          program
  47          (remove nil (list args (dired-get-file-for-visit)))))
  48
  49 (defun b/add-elisp-section ()
  50   (interactive)
  51   (insert "\n")
  52   (forward-line -1)
  53   (insert "\n\f\n;;; "))
  54
  55 ;; (defvar b/fill-column 47
  56 ;;   "My custom `fill-column'.")
  57
  58 (defconst b/asterism "* * *")
  59
  60 (defun b/insert-asterism ()
  61   "Insert a centred asterism."
  62   (interactive)
  63   (insert
  64    (concat
  65     "\n\n"
  66     (make-string (floor (/ (- fill-column (length b/asterism)) 2))
  67                  ?\s)
  68     b/asterism
  69     "\n\n")))
  70
  71 (defun b/no-mouse-autoselect-window ()
  72   "Conveniently disable `focus-follows-mouse'.
  73 For disabling the behaviour for certain buffers and/or modes."
  74   (make-local-variable 'mouse-autoselect-window)
  75   (setq mouse-autoselect-window nil))
  76
  77 (defun b/kill-current-buffer ()
  78   "Kill the current buffer."
  79   ;; also see https://redd.it/64xb3q
  80   (interactive)
  81   (kill-buffer (current-buffer)))
  82
  83 (defun b/move-indentation-or-beginning-of-line (arg)
  84   "Move to the indentation or to the beginning of line."
  85   (interactive "^p")
  86   ;; (if (bolp)
  87   ;;     (back-to-indentation)
  88   ;;   (move-beginning-of-line arg))
  89   (if (= (point)
  90          (progn (back-to-indentation)
  91                 (point)))
  92       (move-beginning-of-line arg)))
  93
  94 (defun b/join-line-top ()
  95   "Like `join-line', but join next line to the current line."
  96   (interactive)
  97   (join-line 1))
  98
  99 (defun b/duplicate-line-or-region (&optional n)
 100   "Duplicate the current line, or region (if active).
 101 Make N (default: 1) copies of the current line or region."
 102   (interactive "*p")
 103   (let ((u-r-p (use-region-p))          ; if region is active
 104         (n1 (or n 1)))
 105     (save-excursion
 106       (let ((text
 107              (if u-r-p
 108                  (buffer-substring (region-beginning) (region-end))
 109                (prog1 (thing-at-point 'line)
 110                  (end-of-line)
 111                  (if (eobp)
 112                      (newline)
 113                    (forward-line 1))))))
 114         (dotimes (_ (abs n1))
 115           (insert text))))))
 116
 117 (provide 'bandali-utils)
 118 ;;; bandali-utils.el ends here