I'm looking to keep a history of file operations in Emacs, in particular file open and save commands, with associated timestamps and pid, has anyone done something like this?
You can easily implement it by yourself using emacs standard hooks.
Something like this:
(setq *find-file-list* '())
(setq *save-file-list* '())
(add-hook 'find-file-hook (lambda ()
(push (list (buffer-file-name) (time-stamp-string)) *find-file-list*)))
(add-hook 'after-save-hook (lambda ()
(push (list (buffer-file-name) (time-stamp-string)) *save-file-list*)))
Related
i have a function
(defun a--before-test-save-hook()
"Test of before save hook"
(message "foobar"))
and i want to run it in prog-mode except python-mode,
but i have no clue now
and i just add-hook in prog-mode including python-mode
(add-hook 'prog-mode (lambda ()
(add-hook 'before-save-hook 'a-test-before-save-hook t t)))
i have try
(defun a-test-before-save-hook()
"Test of before save hook"
(unless (eq major-mode 'python-mode)
(message "foobar")))
but i want a better try,any solution will be appreciated.
Not sure if it's better, but you could do:
(add-hook 'prog-mode-hook
(lambda ()
(unless (derived-mode-p 'python-mode)
(add-hook 'before-save-hook
#'a-test-before-save-hook t t))))
Of course, my own reflex is to ask "what makes Python special?". The answer might let you replace the (derived-mode-p 'python-mode) test with something that goes more directly at the heart of the issue (e.g. maybe the issue is related to indentation-significance and would hence also apply to Coffeescript and Haskell and maybe you could check electric-indent-inhibit instead).
I'm new to emacs and lisp.
I wanted to auto-load the dot file when it was saved. Meaning, when I save my .emacs file, it would automatically call load-file on it (thus letting me know right away if I messed up).
But I can't seen to be able to find a comprehensive tutorial on hooks in emacs.
This is what I've come up with:
(defun load-init-after-save ()
"After saving this file, load it"
(if (eq bname this) ('load-file this) (nil))
)
(add-hook 'after-save-hook 'load-init-after-save)
Of course, this is incorrect: bname and this are just placeholders. And I don't want this function to run on all saves, just when the .emacs file is saved.
Does anyone know how to do this? Is there a better, easier way?
The following code loads your .emacs or ~/.emacs.d/init.el file after save:
(defun my-load-user-init-file-after-save ()
(when (string= (file-truename user-init-file)
(file-truename (buffer-file-name)))
(let ((debug-on-error t))
(load (buffer-file-name)))))
(add-hook 'after-save-hook #'my-load-user-init-file-after-save)
Since your intended use is error-checking, the code also enables the debugger while loading the init file, so that you get a nice backtrace in case of errors.
For error checking of your init file you may also find Flycheck useful. It checks your init file on the fly with the byte compiler, highlights any errors and warnings in the buffer, and—optionally—gives you a list of all errors and warnings.
Disclaimer: I'm the maintainer of this library.
Way 1
One way of doing is to install auto-compile-mode from MELPA, and enable it:
(defun my-emacs-lisp-hook ()
(auto-compile-mode 1))
(add-hook 'emacs-lisp-mode-hook 'my-emacs-lisp-hook)
Now each time you save an Elisp file that's byte-compiled, it will be
re-compiled. Compilation will usually catch some bad errors.
To compile any Elisp file, select it in dired (C-x d)
and press B (dired-do-byte-compile).
Way 2
Use this custom code I wrote.
(defun test-emacs ()
(interactive)
(require 'async)
(async-start
(lambda () (shell-command-to-string "emacs --batch --eval \"(condition-case e (progn (load \\\"~/.emacs\\\") (message \\\"-OK-\\\")) (error (message \\\"ERROR!\\\") (signal (car e) (cdr e))))\""))
`(lambda (output)
(if (string-match "-OK-" output)
(when ,(called-interactively-p 'any)
(message "All is well"))
(switch-to-buffer-other-window "*startup error*")
(delete-region (point-min) (point-max))
(insert output)
(search-backward "ERROR!")))))
(defun auto-test-emacs ()
(when (eq major-mode 'emacs-lisp-mode))
(test-emacs))
(add-hook 'after-save-hook 'auto-test-emacs)
This will start a new Emacs instance in the background each time you
save a file. If something goes wrong, it will complain.
The second approach uses async.
If you really want to do this just for .emacs user this:
(defun auto-test-emacs ()
(when (and (eq major-mode 'emacs-lisp-mode)
(equal (file-truename user-init-file)
(expand-file-name
buffer-file-truename)))
(test-emacs)))
If I do
(add-hook 'haskell-mode-hook
(lambda ()
(setq indent-tabs-mode t)
(setq tab-width 4)
(message "OK")))
in my ~/.emacs.d/init.el, then the (lambda ...) does get executed when I enter haskell-mode.
However, if I use a function like this:
(defun my-add-hook (hook tmode twidth)
(add-hook hook
(lambda ()
(setq indent-tabs-mode tmode)
(setq tab-width twidth)
(message "OK"))))
and then call it later in ~/.emacs.d/init.el like so:
(my-add-hook 'haskell-mode-hook t 4)
Then nothing happens (even the "OK" message isn't displayed). Is add-hook a
special function that cannot be used from within a defun? I have per-project
settings defined in a separate initialization file that detects the buffer name
and adds (lambda ()...) calls to the pertinent major mode (in the example
above, haskell-mode); I want to reduce the code verbosity by using a thin
wrapper like my-add-hook above, but I cannot tell why add-hook is being so
difficult.
EDIT1: Added code for clarification.
EDIT2: I do get a "File mode specification error: (void-variable tmode)" message when I try to use my-add-hook.
Here's a simple fix without needing to know about lexical binding:
(defun my-add-hook (hook tmode twidth)
(add-hook hook
`(lambda ()
(setq indent-tabs-mode ,tmode)
(setq tab-width ,twidth)
(message "OK"))))
You can use lexical-let to rebind the variables, then the lambda function will preserve their values:
(defun my-add-hook (hook tmode twidth)
(lexical-let ((tmode tmode)
(twidth twidth))
(add-hook hook
(lambda ()
(setq indent-tabs-mode tmode)
(setq tab-width twidth)
(message "OK")))))
I'm not sure whether this is the most idiomatic Emacs Lisp code, but it does follow the same pattern shown in the Emacs Wiki article DynamicBindingVsLexicalBinding, which defines compose as:
(defun compose (f g)
(lexical-let ((f f)
(g g))
(lambda (x)
(funcall f (funcall g x)))))
I have various things set up in my 'before-save-hook. For example, I run 'delete-trailing-whitespace. This is what I want in almost all occasions.
But sometimes, I'm working on files that are shared with other people, and the file already has a bunch of trailing whitespace. If I save the file, I'll get a big diff that's pretty confusing, as my change is buried in dozens or hundreds of meaningless changes. Yes, everyone could just tell their diff tool to not show whitespace changes, but that's something that everyone has to do every time they look at the diff. I'd rather not even have the whitespace change.
Is there anything I can do to save the file without the whitespace changes, short of starting a new instance of Emacs with no init.el file, or with a modified init.el that doesn't have the hook?
Here is how I save without triggering delete-trailing-whitespace:
C-x C-q C-x C-s C-x C-q: read-only, save, revert read-only
A simpler solution I came up with is that my fundamental-mode has no hooks installed, because I want it to be as plain as possible. Thus if I want to save a file without running hooks, I temporarily switch to fundamental-mode.
Based on a comment discussion with #Stefan, here are two possible (untested) solutions:
Use let:
(defun save-buffer-without-dtw ()
(interactive)
(let ((b (current-buffer))) ; memorize the buffer
(with-temp-buffer ; new temp buffer to bind the global value of before-save-hook
(let ((before-save-hook (remove 'delete-trailing-whitespace before-save-hook)))
(with-current-buffer b ; go back to the current buffer, before-save-hook is now buffer-local
(let ((before-save-hook (remove 'delete-trailing-whitespace before-save-hook)))
(save-buffer)))))))
Use unwind-protect:
(defun save-buffer-without-dtw ()
(interactive)
(let ((restore-global
(memq 'delete-trailing-whitespace (default-value before-save-hook)))
(restore-local
(and (local-variable-p 'before-save-hook)
(memq 'delete-trailing-whitespace before-save-hook))))
(unwind-protect
(progn
(when restore-global
(remove-hook 'before-save-hook 'delete-trailing-whitespace))
(when restore-local
(remove-hook 'before-save-hook 'delete-trailing-whitespace t))
(save-buffer))
(when restore-global
(add-hook 'before-save-hook 'delete-trailing-whitespace))
(when restore-local
(add-hook 'before-save-hook 'delete-trailing-whitespace nil t)))))
The problem with the second solution is that the order of functions in the before-save-hook may change.
Here's another solution:
(defvar my-inhibit-dtw nil)
(defun my-delete-trailing-whitespace ()
(unless my-inhibit-dtw (delete-trailing-whitespace)))
(add-hook 'before-save-hook 'my-delete-trailing-whitespace)
and then
(defun my-inhibit-dtw ()
(interactive)
(set (make-local-variable 'my-inhibit-dtw) t))
so you can M-x my-inhibit-dtw RET in the buffers where you don't want to trim whitespace.
I wrote a command inspired by Nicholas Douma's solution.
(defun olav-save-buffer-as-is ()
"Save file \"as is\", that is in read-only-mode."
(interactive)
(if buffer-read-only
(save-buffer)
(read-only-mode 1)
(save-buffer)
(read-only-mode 0)))
What we need to do is remove 'delete-trailing-whitespace from before-save-hook, save the buffer, then add it back.
This code will do that, but only remove and add it if it's there to begin with.
;; save the buffer, removing and readding the 'delete-trailing-whitespace function
;; to 'before-save-hook if it's there
(defun save-buffer-no-delete-trailing-whitespace ()
(interactive)
(let ((normally-should-delete-trailing-whitespace (memq 'delete-trailing-whitespace before-save-hook)))
(when normally-should-delete-trailing-whitespace
(remove-hook 'before-save-hook 'delete-trailing-whitespace))
(save-buffer)
(when normally-should-delete-trailing-whitespace
(add-hook 'before-save-hook 'delete-trailing-whitespace))))
(global-set-key (kbd "C-c C-s") 'save-buffer-no-delete-trailing-whitespace)
It also binds the command to (kbd C-c C-s), for convenience.
Since I am using org-mode to track my todo list in emacs, I like the iPhone app: MobileOrg, with it, I can access my todo list all day.
But here's the problem:
I have to manually org-mobile-push my changes from local file to mobile phone through dropbox, and org-mobile-pull the changes made by phone back.
How to make that automatically? Like adding some recipes in dotemacs file.
Add these two lines to dot emacs file:
(add-hook 'after-init-hook 'org-mobile-pull)
(add-hook 'kill-emacs-hook 'org-mobile-push)
With them, it automatically pulls the changes on emacs startup, and pushes the changes before emacs exits.
-- Update
If you never exit your Emacs, this solution might not work for you. So, another solution using idle timer
;; moble sync
(defvar org-mobile-sync-timer nil)
(defvar org-mobile-sync-idle-secs (* 60 10))
(defun org-mobile-sync ()
(interactive)
(org-mobile-pull)
(org-mobile-push))
(defun org-mobile-sync-enable ()
"enable mobile org idle sync"
(interactive)
(setq org-mobile-sync-timer
(run-with-idle-timer org-mobile-sync-idle-secs t
'org-mobile-sync)));
(defun org-mobile-sync-disable ()
"disable mobile org idle sync"
(interactive)
(cancel-timer org-mobile-sync-timer))
(org-mobile-sync-enable)
I just found out it is same as below answer, so, if you prefer the idle timer solution, please upvote tkf's answer.
I have something like this in my Emacs setting to do push and pull when I am away from computer.
(defvar my-org-mobile-sync-timer nil)
(defvar my-org-mobile-sync-secs (* 60 20))
(defun my-org-mobile-sync-pull-and-push ()
(org-mobile-pull)
(org-mobile-push)
(when (fboundp 'sauron-add-event)
(sauron-add-event 'my 3 "Called org-mobile-pull and org-mobile-push")))
(defun my-org-mobile-sync-start ()
"Start automated `org-mobile-push'"
(interactive)
(setq my-org-mobile-sync-timer
(run-with-idle-timer my-org-mobile-sync-secs t
'my-org-mobile-sync-pull-and-push)))
(defun my-org-mobile-sync-stop ()
"Stop automated `org-mobile-push'"
(interactive)
(cancel-timer my-org-mobile-sync-timer))
(my-org-mobile-sync-start)
Alternative is to put the following in cron job
(I found this here https://github.com/matburt/mobileorg-android/wiki/Scripting/):
emacs --batch --load ~/.emacs --eval "(org-mobile-pull)" --eval "(org-mobile-push)"
This code is taken from http://kenmankoff.com/2012/08/17/emacs-org-mode-and-mobileorg-auto-sync/, with a couple of details changed. You need to configure the variables in the beginning. This code will
Check every 30s whether MobileOrg has synced, and if so
Pull from MobileOrg.
Push to MobileOrg.
This is necessary to update the agenda views in MobileOrg.
With this behavior, you can be away from your computer, update some things in MobileOrg, sync, wait 30 seconds, sync again, and your mobile agenda view will be updated.
Whenever an org file is saved
Check whether the saved org file is supposed to be synced with MobileOrg, and if so
Wait for the user to become idle
Push to MobileOrg
Code for your .emacs file:
(require 'org-mobile)
;; Configure these two variables
(setq org-mobile-inbox-for-pull "~/Dropbox/org/mobile.org"
org-mobile-directory "~/Dropbox/MobileOrg")
(require 'gnus-async)
;; Define a timer variable
(defvar org-mobile-push-timer nil
"Timer that `org-mobile-push-timer' used to reschedule itself, or nil.")
;; Push to mobile when the idle timer runs out
(defun org-mobile-push-with-delay (secs)
(when org-mobile-push-timer
(cancel-timer org-mobile-push-timer))
(setq org-mobile-push-timer
(run-with-idle-timer
(* 1 secs) nil 'org-mobile-push)))
;; After saving files, start an idle timer after which we are going to push
(add-hook 'after-save-hook
(lambda ()
(if (or (eq major-mode 'org-mode) (eq major-mode 'org-agenda-mode))
(dolist (file (org-mobile-files-alist))
(if (string= (expand-file-name (car file)) (buffer-file-name))
(org-mobile-push-with-delay 10))))))
;; watch mobileorg.org for changes, and then call org-mobile-pull
(defun org-mobile-install-monitor (file secs)
(run-with-timer
0 secs
(lambda (f p)
(unless (< p (second (time-since (elt (file-attributes f) 5))))
(org-mobile-pull)
(org-mobile-push)))
file secs))
(defvar monitor-timer (org-mobile-install-monitor (concat org-mobile-directory "/mobileorg.org") 30)
"Check if file changed every 30 s.")
you can also push right after saving a note, like this:
(add-hook
'after-save-hook
(lambda ()
(if (string= buffer-file-name "<path to my notes.org>")
(org-mobile-push)
)
))
I use this elisp code from gist on my init.el and it works pretty well, except it doesn't have org-mobile-pull built in.
As a side solution, similar to Sandeep C's
;; for Emacs 24.3.1 insert next line
(require 'cl)
;; automatically org-mobile-push on save of a file
(add-hook
'after-save-hook
(lambda ()
(let (
(org-filenames (mapcar 'file-name-nondirectory (directory-files org-directory))) ; list of org file names (not paths)
(filename (file-name-nondirectory buffer-file-name)) ; list of the buffers filename (not path)
)
(if (find filename org-filenames :test #'string=)
(org-mobile-push)
)
)
)
)
I opted to simply push when saving, so I added this to my emacs init file:
(defun org-mobile-push-on-save ()
"Used in `after-save-hook'."
(when (memq this-command '(save-buffer save-some-buffers))
(org-mobile-push)))
(add-hook 'org-mode-hook
(lambda ()
(add-hook 'after-save-hook 'org-mobile-push-on-save nil 'make-local)))
In a nutshell, it adds an after-save-hook to org-mode buffers.
More info on the code:
https://emacs.stackexchange.com/a/14476/12694
https://stackoverflow.com/a/6141681/45881
For auto-pull, a timer as in other answers is probably a good way.