Move utility functions from configuration.org to lisp/gpolonkai/utilities.el
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This is a collection of functions and commands i wrote or stole from all around the internet.
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** Utilities
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*** Make a backup filename under ~user-emacs-cache-directory~
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Taken from [[http://ergoemacs.org/emacs/emacs_set_backup_into_a_directory.html][Xah’s site]].
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#+begin_src emacs-lisp
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(defun xah/backup-file-name (fpath)
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"Return a new file path for FPATH under `user-emacs-cache-directory'"
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(let* ((backup-root-dir (expand-file-name "backup" user-emacs-cache-directory))
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(file-path (replace-regexp-in-string "[A-Za-z]:" "" fpath))
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(backup-file-path (replace-regexp-in-string "//" "/" (concat backup-root-dir file-path "~"))))
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(make-directory (file-name-directory backup-file-path) (file-name-directory backup-file-path))
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backup-file-path))
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#+end_src
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*** Check if we’re running under Termux
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We need to do things differently, if so.
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There’s probably a better way, though, other than checking the path of our home directory.
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#+begin_src emacs-lisp
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(defun gpolonkai/termux-p ()
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"Check if Emacs is running under Termux."
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(string-match-p
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(regexp-quote "/com.termux/")
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(expand-file-name "~")))
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#+end_src
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*** Find the first number on line
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#+begin_src emacs-lisp
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(defun gpolonkai/find-number-on-line ()
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"Find the first number on the current line."
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(save-excursion
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(without-restriction
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(goto-char (pos-bol))
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(when (re-search-forward "[0-9]+" (pos-eol) t)
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(number-at-point)))))
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#+end_src
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*** Round number at point to the given decimals
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#+begin_src emacs-lisp
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(defun gpolonkai/round-number-at-point-to-decimals (decimal-count)
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(interactive "NDecimal count: ")
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(let ((mult (expt 10 decimal-count)))
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(replace-match (number-to-string
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(/
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(fround
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(*
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mult
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(number-at-point)))
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mult)))))
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#+end_src
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*** Leave ~isearch~ at the other end of the matched string
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From [[http://endlessparentheses.com/leave-the-cursor-at-start-of-match-after-isearch.html][Endless Parentheses]].
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#+begin_src emacs-lisp
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(defun ep/isearch-exit-other-end ()
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"Exit isearch, at the opposite end of the string."
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(interactive)
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(isearch-exit)
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(goto-char isearch-other-end))
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#+end_src
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*** Mark the current match after leaving ~isearch~
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From [[http://emacs.stackexchange.com/a/31321/507][Emacs SE]].
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#+begin_src emacs-lisp
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(defun e-se/isearch-exit-mark-match ()
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"Exit isearch and mark the current match."
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(interactive)
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(isearch-exit)
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(push-mark isearch-other-end)
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(activate-mark))
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#+end_src
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*** Copy the prototype of the current C function
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#+begin_src emacs-lisp
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(defun gpolonkai/copy-func-prototype ()
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"Copy the current function's prototype to the kill ring."
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(interactive)
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(save-excursion
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(beginning-of-defun)
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(let ((protocopy-begin (point)))
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(forward-list)
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(let ((protocopy-end (point)))
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(kill-ring-save protocopy-begin protocopy-end)))))
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#+end_src
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** Window manipulation
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*** Bury a window
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3
init.el
3
init.el
@ -56,6 +56,9 @@
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(use-package bind-key)
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;; Custom functions and commands
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(load "gpolonkai/utilities")
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;; I started moving my configuration to this Org file. It’s easier to document this way.
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(org-babel-load-file (expand-file-name "configuration.org" user-emacs-directory))
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101
lisp/gpolonkai/utilities.el
Normal file
101
lisp/gpolonkai/utilities.el
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@ -0,0 +1,101 @@
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;;; gpolonkai/utilities.el --- Utilities
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;;;
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;;; SPDX-License-Identifier: GPL-3.0-or-later
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;;; Copyright © 2025 Gergely Polonkai
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;;; This library is free software; you can redistribute it and/or
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;;; modify it under the terms of the GNU Lesser General Public
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;;; License as published by the Free Software Foundation; either
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;;; version 3 of the License, or (at your option) any later version.
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;;;
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;;; This library is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; Lesser General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU Lesser General Public
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;;; License along with this library; if not, write to the
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;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;;; Boston, MA 02111-1307, USA.
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;;;
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;;; Commentary:
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;;;
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;;; Utility functions stolen from the Internet or written by me
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;;;
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;;; Code:
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;; Make a backup filename under `user-emacs-cache-directory'
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;;
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;; Taken from http://ergoemacs.org/emacs/emacs_set_backup_into_a_directory.html
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(defun xah/backup-file-name (fpath)
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"Return a new file path for FPATH under `user-emacs-cache-directory'."
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(let* ((backup-root-dir (expand-file-name "backup" user-emacs-cache-directory))
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(file-path (replace-regexp-in-string "[A-Za-z]:" "" fpath))
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(backup-file-path (replace-regexp-in-string "//" "/" (concat backup-root-dir file-path "~"))))
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(make-directory (file-name-directory backup-file-path) (file-name-directory backup-file-path))
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backup-file-path))
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;; Check if we’re running under Termux
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;;
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;; We need to do things differently, if so. There’s probably a better way, though, other than checking the path of our
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;; home directory.
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(defun gpolonkai/termux-p ()
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"Check if Emacs is running under Termux."
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(string-match-p
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(regexp-quote "/com.termux/")
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(expand-file-name "~")))
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(defun gpolonkai/find-number-on-line ()
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"Find the first number on the current line."
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(save-excursion
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(without-restriction
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(goto-char (pos-bol))
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(when (re-search-forward "[0-9]+" (pos-eol) t)
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(number-at-point)))))
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(defun gpolonkai/round-number-at-point-to-decimals (decimal-count)
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"Round number at point to the given decimals.
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The number of decimals in the result is specified by DECIMAL-COUNT."
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(interactive "NDecimal count: ")
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(let ((mult (expt 10 decimal-count)))
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(replace-match (number-to-string
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(/
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(fround
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(*
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mult
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(number-at-point)))
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mult)))))
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;; From http://endlessparentheses.com/leave-the-cursor-at-start-of-match-after-isearch.html
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(defun ep/isearch-exit-other-end ()
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"Exit `isearch' at the opposite end of the string."
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(interactive)
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(isearch-exit)
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(goto-char isearch-other-end))
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;; From http://emacs.stackexchange.com/a/31321/507
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(defun e-se/isearch-exit-mark-match ()
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"Exit isearch and mark the current match."
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(interactive)
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(isearch-exit)
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(push-mark isearch-other-end)
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(activate-mark))
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(defun gpolonkai/copy-func-prototype ()
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"Copy the current function's prototype to the kill ring."
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(interactive)
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(save-excursion
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(beginning-of-defun)
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(let ((protocopy-begin (point)))
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(forward-list)
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(let ((protocopy-end (point)))
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(kill-ring-save protocopy-begin protocopy-end)))))
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(provide 'gpolonkai/utilities)
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;;; utilities.el ends here
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