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(require 's)
;; A few handy functions I use in init.el (or not, but they're nice to
;; have)
(defun custom-download-theme (url filename)
"Downloads a theme through HTTP and places it in ~/.emacs.d/themes"
;; Ensure the directory exists
(unless (file-exists-p "~/.emacs.d/themes")
(make-directory "~/.emacs.d/themes"))
;; Adds the themes folder to the theme load path (if not already
;; there)
(unless (member "~/.emacs.d/themes" custom-theme-load-path)
(add-to-list 'custom-theme-load-path "~/.emacs.d/themes"))
;; Download file if it doesn't exist.
(let ((file
(concat "~/.emacs.d/themes/" filename)))
(unless (file-exists-p file)
(url-copy-file url file))))
(defun custom-download-script (url filename)
"Downloads an Elisp script, places it in ~/.emacs/other and then loads it"
;; Ensure the directory exists
(unless (file-exists-p "~/.emacs.d/other")
(make-directory "~/.emacs.d/other"))
;; Download file if it doesn't exist.
(let ((file
(concat "~/.emacs.d/other/" filename)))
(unless (file-exists-p file)
(url-copy-file url file))
(load file)))
(defun keychain-password (account &optional keychain)
"Returns the password for the account, by default it's looked up in the Login.keychain but a
different keychain can be specified."
(let ((k (if keychain keychain "Login.keychain")))
(replace-regexp-in-string
"\n" ""
(shell-command-to-string (concat "security find-generic-password -w -a "
account
" "
k)))))
;; This clones a git repository to 'foldername in .emacs.d
;; if there isn't already a folder with that name
(defun custom-clone-git (url foldername)
"Clones a git repository to .emacs.d/foldername"
(let ((fullpath (concat "~/.emacs.d/" foldername)))
(unless (file-exists-p fullpath)
(async-shell-command (concat "git clone " url " " fullpath)))))
(defun load-file-if-exists (filename)
(if (file-exists-p filename)
(load filename)))
(defun goto-line-with-feedback ()
"Show line numbers temporarily, while prompting for the line number input"
(interactive)
(unwind-protect
(progn
(setq-local display-line-numbers t)
(let ((target (read-number "Goto line: ")))
(avy-push-mark)
(goto-line target)))
(setq-local display-line-numbers nil)))
(defun untabify-buffer ()
(interactive)
(untabify (point-min) (point-max)))
(defun indent-buffer ()
(interactive)
(indent-region (point-min) (point-max)))
(defun cleanup-buffer ()
"Perform a bunch of operations on the whitespace content of a buffer.
Including indent-buffer, which should not be called automatically on save."
(interactive)
(untabify-buffer)
(delete-trailing-whitespace)
(indent-buffer))
;; These come from the emacs starter kit
(defun esk-add-watchwords ()
(font-lock-add-keywords
nil '(("\\<\\(FIX\\(ME\\)?\\|TODO\\|DEBUG\\|HACK\\|REFACTOR\\|NOCOMMIT\\)"
1 font-lock-warning-face t))))
(defun esk-sudo-edit (&optional arg)
(interactive "p")
(if (or arg (not buffer-file-name))
(find-file (concat "/sudo:root@localhost:" (read-file-name "File: ")))
(find-alternate-file (concat "/sudo:root@localhost:" buffer-file-name))))
;; Open Fefes blog
(defun fefes-blog ()
(interactive)
(eww "https://blog.fefe.de/"))
;; Open this machines NixOS config
(defun nix-config ()
(interactive)
(find-file "/etc/nixos/configuration.nix"))
;; Open local emacs configuration
(defun emacs-config ()
(interactive)
(dired "~/.emacs.d/"))
;; Get the nix store path for a given derivation.
;; If the derivation has not been built before, this will trigger a build.
(defun nix-store-path (derivation)
(let ((expr (concat "with import <nixos> {}; " derivation)))
(s-chomp (shell-command-to-string (concat "nix-build -E '" expr "'")))))
(defun insert-nix-store-path ()
(interactive)
(let ((derivation (read-string "Derivation name (in <nixos>): ")))
(insert (nix-store-path derivation))))
(defun toggle-force-newline ()
"Buffer-local toggle for enforcing final newline on save."
(interactive)
(setq-local require-final-newline (not require-final-newline))
(message "require-final-newline in buffer %s is now %s"
(buffer-name)
require-final-newline))
;; Helm includes a command to run external applications, which does
;; not seem to exist in ivy. This implementation uses some of the
;; logic from Helm to provide similar functionality using ivy.
(defun list-external-commands ()
"Creates a list of all external commands available on $PATH
while filtering NixOS wrappers."
(cl-loop
for dir in (split-string (getenv "PATH") path-separator)
when (and (file-exists-p dir) (file-accessible-directory-p dir))
for lsdir = (cl-loop for i in (directory-files dir t)
for bn = (file-name-nondirectory i)
when (and (not (s-contains? "-wrapped" i))
(not (member bn completions))
(not (file-directory-p i))
(file-executable-p i))
collect bn)
append lsdir into completions
finally return (sort completions 'string-lessp)))
(defun ivy-run-external-command ()
"Prompts the user with a list of all installed applications and
lets them select one to launch."
(interactive)
(let ((external-commands-list (list-external-commands)))
(ivy-read "Command:" external-commands-list
:require-match t
:history 'external-commands-history
:action (lambda (cmd)
(message "Starting %s..." cmd)
(set-process-sentinel
(start-process-shell-command cmd nil cmd)
(lambda (process event)
(when (string= event "finished\n")
(message "%s process finished." process))))))))
(provide 'functions)
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