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emacs/init.el

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;; Meta
;; Emacs can only load =.el=-files. We can use =C-c C-v t= to run
;; =org-babel-tangle=, which extracts the code blocks from the current file
;; into a source-specific file (in this case a =.el=-file).
;; To avoid doing this each time a change is made we can add a function to
;; the =after-save-hook= ensuring to always tangle and byte-compile the
;; =org=-document after changes.
(defun tangle-init ()
"If the current buffer is 'init.org' the code-blocks are
tangled, and the tangled file is compiled."
(when (equal (buffer-file-name)
(expand-file-name (concat user-emacs-directory "init.org")))
;; Avoid running hooks when tangling.
(let ((prog-mode-hook nil))
(org-babel-tangle)
(byte-compile-file (concat user-emacs-directory "init.el")))))
(add-hook 'after-save-hook 'tangle-init)
;; I'd like to keep a few settings private, so we load a =private.el= if it
;; exists after the init-file has loaded.
(add-hook
'after-init-hook
(lambda ()
(let ((private-file (concat user-emacs-directory "private.el")))
(when (file-exists-p private-file)
(load-file private-file)))))
;; Package
;; Managing extensions for Emacs is simplified using =package= which is
;; built in to Emacs 24 and newer. To load downloaded packages we need to
;; initialize =package=. =cl= is a library that contains many functions from
;; Common Lisp, and comes in handy quite often, so we want to make sure it's
;; loaded, along with =package=, which is obviously needed.
(require 'cl)
(require 'package)
(setq package-enable-at-startup nil)
(package-initialize)
;; Packages can be fetched from different mirrors, [[http://melpa.milkbox.net/#/][melpa]] is the largest
;; archive and is well maintained.
(setq package-archives
'(("gnu" . "http://elpa.gnu.org/packages/")
("org" . "http://orgmode.org/elpa/")
("MELPA" . "http://melpa.milkbox.net/packages/")))
;; We can define a predicate that tells us whether or not the newest version
;; of a package is installed.
(defun newest-package-installed-p (package)
"Return true if the newest available PACKAGE is installed."
(when (package-installed-p package)
(let* ((get-desc (if (version< emacs-version "24.4") 'cdr 'cadr))
(builtin-version (assq package package--builtin-versions))
(local-pkg-desc (assq package package-alist))
(newest-pkg-desc (assq package package-archive-contents)))
(cond ((and local-pkg-desc newest-pkg-desc)
(version-list-= (package-desc-version
(funcall get-desc local-pkg-desc))
(package-desc-version
(funcall get-desc newest-pkg-desc))))
((and builtin-version newest-pkg-desc)
(version-list-= builtin-version
(package-desc-version
(funcall get-desc newest-pkg-desc))))))))
;; Let's write a function to install a package if it is not installed or
;; upgrades it if a new version has been released. Here our predicate comes
;; in handy.
(defun upgrade-or-install-package (package)
"Unless the newest available version of PACKAGE is installed
PACKAGE is installed and the current version is deleted."
(unless (newest-package-installed-p package)
(let ((pkg-desc (assq package package-alist)))
(when pkg-desc
(if (version< emacs-version "24.4")
(package-delete (symbol-name package)
(package-version-join
(package-desc-vers (cdr pkg-desc))))
(package-delete pkg-desc)))
(and (assq package package-archive-contents)
(package-install package)))))
;; Also, we will need a function to find all dependencies from a given package.
(defun dependencies (package)
"Returns a list of dependencies from a given PACKAGE."
(let* ((pkg-desc (assq package package-alist))
(reqs (and pkg-desc (package-desc-reqs (cdr pkg-desc)))))
(mapcar 'car reqs)))
;; The =package-refresh-contents= function downloads archive descriptions,
;; this is a major bottleneck in this configuration. To avoid this we can
;; try to only check for updates once every day or so. Here are three
;; variables. The first specifies how often we should check for updates. The
;; second specifies whether one should update during the initialization. The
;; third is a path to a file where a time-stamp is stored in order to check
;; when packages were updated last.
(defvar days-between-updates 7)
(defvar do-package-update-on-init t)
(defvar package-last-update-file
(expand-file-name (concat user-emacs-directory ".package-last-update")))
;; The tricky part is figuring out when packages were last updated. Here is
;; a hacky way of doing it, using [[http://www.gnu.org/software/emacs/manual/html_node/emacs/Time-Stamps.html][time-stamps]]. By adding a time-stamp to the
;; a file, we can determine whether or not to do an update. After that we
;; must run the =time-stamp=-function to update the time-stamp.
(require 'time-stamp)
;; Open the package-last-update-file
(with-temp-file package-last-update-file
(if (file-exists-p package-last-update-file)
(progn
;; Insert it's original content's.
(insert-file-contents package-last-update-file)
(let ((start (re-search-forward time-stamp-start nil t))
(end (re-search-forward time-stamp-end nil t)))
(when (and start end)
;; Assuming we have found a time-stamp, we check determine if it's
;; time to update.
(setq do-package-update-on-init
(<= days-between-updates
(days-between
(current-time-string)
(buffer-substring-no-properties start end))))
;; Remember to update the time-stamp.
(when do-package-update-on-init
(time-stamp)))))
;; If no such file exists it is created with a time-stamp.
(insert "Time-stamp: <>")
(time-stamp)))
;; Now we can use the function above to make sure packages are installed and
;; up to date. Here are some packages I find useful (some of these
;; configurations are also dependent on them).
(when (and do-package-update-on-init
(y-or-n-p "Update all packages?"))
(package-refresh-contents)
(let* ((packages
'(ac-geiser ; Auto-complete backend for geiser
ac-slime ; An auto-complete source using slime completions
ace-jump-mode ; quick cursor location minor mode
auto-compile ; automatically compile Emacs Lisp libraries
auto-complete ; auto completion
centered-window ; Center the text when there's only one window
elscreen ; window session manager
expand-region ; Increase selected region by semantic units
flx-ido ; flx integration for ido
idle-require ; load elisp libraries while Emacs is idle
ido-vertical-mode ; Makes ido-mode display vertically.
geiser ; GNU Emacs and Scheme talk to each other
haskell-mode ; A Haskell editing mode
jedi ; Python auto-completion for Emacs
js2-mode ; Improved JavaScript editing mode
magit ; control Git from Emacs
markdown-mode ; Emacs Major mode for Markdown-formatted files.
matlab-mode ; MATLAB integration with Emacs.
monokai-theme ; A fruity color theme for Emacs.
move-text ; Move current line or region with M-up or M-down
multiple-cursors ; Multiple cursors for Emacs.
org ; Outline-based notes management and organizer
paredit ; minor mode for editing parentheses
powerline ; Rewrite of Powerline
pretty-lambdada ; the word `lambda' as the Greek letter.
slime ; Superior Lisp Interaction Mode for Emacs
smex ; M-x interface with Ido-style fuzzy matching.
undo-tree ; Treat undo history as a tree
try)) ; Try out Emacs packages.
;; Fetch dependencies from all packages.
(reqs (mapcar 'dependencies packages))
;; Append these to the original list, and remove any duplicates.
(packages (delete-dups (apply 'append packages reqs))))
(dolist (package packages)
(upgrade-or-install-package package)))
;; This package is only relevant for Mac OS X.
(when (memq window-system '(mac ns))
(upgrade-or-install-package 'exec-path-from-shell))
(package-initialize))
;; Mac OS X
;; I run this configuration mostly on Mac OS X, so we need a couple of
;; settings to make things work smoothly. In the package section
;; =exec-path-from-shell= is included (only if you're running OS X), this is
;; to include environment-variables from the shell. It makes useing Emacs
;; along with external processes a lot simpler. I also prefer using the
;; =Command=-key as the =Meta=-key.
(when (memq window-system '(mac ns))
(setq mac-option-modifier nil
mac-command-modifier 'meta
x-select-enable-clipboard t)
(exec-path-from-shell-initialize))
;; Require
;; Some features are not loaded by default to minimize initialization time,
;; so they have to be required (or loaded, if you will). =require=-calls
;; tends to lead to the largest bottleneck's in a
;; configuration. =idle-require= delays the =require=-calls to a time where
;; Emacs is in idle. So this is great for stuff you eventually want to load,
;; but is not a high priority.
(require 'idle-require) ; Need in order to use idle-require
(require 'auto-complete-config) ; a configuration for auto-complete-mode
(dolist (feature
'(auto-compile ; auto-compile .el files
jedi ; auto-completion for python
matlab ; matlab-mode
ob-matlab ; org-babel matlab
ox-latex ; the latex-exporter (from org)
ox-md ; Markdown exporter (from org)
pretty-lambdada ; show 'lambda' as the greek letter.
recentf ; recently opened files
smex ; M-x interface Ido-style.
tex-mode)) ; TeX, LaTeX, and SliTeX mode commands
(idle-require feature))
(setq idle-require-idle-delay 5)
(idle-require-mode 1)
;; Sane defaults
;; These are what /I/ consider to be saner defaults.
;; We can set variables to whatever value we'd like using =setq=.
(setq default-input-method "TeX" ; Use TeX when toggling input method.
doc-view-continuous t ; At page edge goto next/previous.
echo-keystrokes 0.1 ; Show keystrokes asap.
inhibit-startup-message t ; No splash screen please.
initial-scratch-message nil ; Clean scratch buffer.
ring-bell-function 'ignore ; Quiet.
;; Save undo history between sessions, if you have an undo-dir
undo-tree-auto-save-history
(file-exists-p
(concat user-emacs-directory "undo"))
undo-tree-history-directory-alist
;; Put undo-history files in a directory, if it exists.
(let ((undo-dir (concat user-emacs-directory "undo")))
(and (file-exists-p undo-dir)
(list (cons "." undo-dir)))))
;; Some mac-bindings interfere with Emacs bindings.
(when (boundp 'mac-pass-command-to-system)
(setq mac-pass-command-to-system nil))
;; Some variables are buffer-local, so changing them using =setq= will only
;; change them in a single buffer. Using =setq-default= we change the
;; buffer-local variable's default value.
(setq-default fill-column 76 ; Maximum line width.
indent-tabs-mode nil ; Use spaces instead of tabs.
split-width-threshold 100 ; Split verticly by default.
auto-fill-function 'do-auto-fill) ; Auto-fill-mode everywhere.
;; The =load-path= specifies where Emacs should look for =.el=-files (or
;; Emacs lisp files). I have a directory called =site-lisp= where I keep all
;; extensions that have been installed manually (these are mostly my own
;; projects).
(let ((default-directory (concat user-emacs-directory "site-lisp/")))
(when (file-exists-p default-directory)
(normal-top-level-add-to-load-path '("."))
(normal-top-level-add-subdirs-to-load-path)))
;; Answering /yes/ and /no/ to each question from Emacs can be tedious, a
;; single /y/ or /n/ will suffice.
(fset 'yes-or-no-p 'y-or-n-p)
;; To avoid file system clutter we put all auto saved files in a single
;; directory.
(defvar emacs-autosave-directory
(concat user-emacs-directory "autosaves/")
"This variable dictates where to put auto saves. It is set to a
directory called autosaves located wherever your .emacs.d/ is
located.")
;; Sets all files to be backed up and auto saved in a single directory.
(setq backup-directory-alist
`((".*" . ,emacs-autosave-directory))
auto-save-file-name-transforms
`((".*" ,emacs-autosave-directory t)))
;; Set =utf-8= as preferred coding system.
(set-language-environment "UTF-8")
;; By default the =narrow-to-region= command is disabled and issues a
;; warning, because it might confuse new users. I find it useful sometimes,
;; and don't want to be warned.
(put 'narrow-to-region 'disabled nil)
;; Call =auto-complete= default configuration, which enables =auto-complete=
;; globally.
(eval-after-load 'auto-complete-config `(ac-config-default))
;; Automaticly revert =doc-view=-buffers when the file changes on disk.
(add-hook 'doc-view-mode-hook 'auto-revert-mode)
;; Modes
;; There are some modes that are enabled by default that I don't find
;; particularly useful. We create a list of these modes, and disable all of
;; these.
(dolist (mode
'(tool-bar-mode ; No toolbars, more room for text.
scroll-bar-mode ; No scroll bars either.
blink-cursor-mode)) ; The blinking cursor gets old.
(funcall mode 0))
;; Let's apply the same technique for enabling modes that are disabled by
;; default.
(dolist (mode
'(abbrev-mode ; E.g. sopl -> System.out.println.
column-number-mode ; Show column number in mode line.
delete-selection-mode ; Replace selected text.
dirtrack-mode ; directory tracking in *shell*
recentf-mode ; Recently opened files.
show-paren-mode ; Highlight matching parentheses.
projectile-global-mode ; Manage and navigate projects.
global-undo-tree-mode)) ; Undo as a tree.
(funcall mode 1))
(when (version< emacs-version "24.4")
(eval-after-load 'auto-compile
'((auto-compile-on-save-mode 1)))) ; compile .el files on save.
;; This makes =.md=-files open in =markdown-mode=.
(add-to-list 'auto-mode-alist '("\\.md\\'" . markdown-mode))
;; Visual
;; Change the color-theme to =leuven=.
(load-theme 'leuven t)
;; =leuven= is my preferred light theme, but =monokai= makes a very nice
;; dark theme. I want to be able to cycle between these.
(defun cycle-themes ()
"Returns a function that lets you cycle your themes."
(lexical-let ((themes '#1=(leuven monokai . #1#)))
(lambda ()
(interactive)
;; Rotates the thme cycle and changes the current theme.
(load-theme (car (setq themes (cdr themes))) t))))
;; Use the [[http://www.levien.com/type/myfonts/inconsolata.html][Inconsolata]] font if it's installed on the system.
(when (member "Inconsolata" (font-family-list))
(set-face-attribute 'default nil :font "Inconsolata-13"))
;; Ido
;; Interactive do (or =ido-mode=) changes the way you switch buffers and
;; open files/directories. Instead of writing complete file paths and buffer
;; names you can write a part of it and select one from a list of
;; possibilities. Using =ido-vertical-mode= changes the way possibilities
;; are displayed, and =flx-ido-mode= enables fuzzy matching.
(dolist (mode
'(ido-mode ; Interactivly do.
ido-everywhere ; Use Ido for all buffer/file reading.
ido-vertical-mode ; Makes ido-mode display vertically.
flx-ido-mode)) ; Toggle flx ido mode.
(funcall mode 1))
;; We can set the order of file selections in =ido=. I prioritize source
;; files along with =org=- and =tex=-files.
(setq ido-file-extensions-order
'(".el" ".scm" ".lisp" ".java" ".c" ".h" ".org" ".tex"))
;; Sometimes when using =ido-switch-buffer= the =*Messages*= buffer get in
;; the way, so we set it to be ignored (it can be accessed using =C-h e=, so
;; there is really no need for it in the buffer list).
(add-to-list 'ido-ignore-buffers "*Messages*")
;; To make =M-x= behave more like =ido-mode= we can use the =smex=
;; package. It needs to be initialized, and we can replace the binding to
;; the standard =execute-extended-command= with =smex=.
(smex-initialize)
;; Calendar
;; Define a function to display week numbers in =calender-mode=. The snippet
;; is from [[http://www.emacswiki.org/emacs/CalendarWeekNumbers][EmacsWiki]].
(defun calendar-show-week (arg)
"Displaying week number in calendar-mode."
(interactive "P")
(copy-face font-lock-constant-face 'calendar-iso-week-face)
(set-face-attribute
'calendar-iso-week-face nil :height 0.7)
(setq calendar-intermonth-text
(and arg
'(propertize
(format
"%2d"
(car (calendar-iso-from-absolute
(calendar-absolute-from-gregorian
(list month day year)))))
'font-lock-face 'calendar-iso-week-face))))
;; Evaluate the =calendar-show-week= function.
(calendar-show-week t)
;; Set Monday as the first day of the week, and set my location.
(setq calendar-week-start-day 1
calendar-latitude 60.0
calendar-longitude 10.7
calendar-location-name "Oslo, Norway")
;; Mail
;; I use [[http://www.djcbsoftware.nl/code/mu/mu4e.html][mu4e]] (which is a part of [[http://www.djcbsoftware.nl/code/mu/][mu]]) along with [[http://docs.offlineimap.org/en/latest/][offlineimap]] on one of my
;; computers. Because the mail-setup wont work without these programs
;; installed we bind =load-mail-setup= to =nil=. If the value is changed to
;; a =non-nil= value mail is setup.
(defvar load-mail-setup nil)
(when load-mail-setup
(eval-after-load 'mu4e
'(progn
;; Some basic mu4e settings.
(setq mu4e-maildir "~/.ifimail" ; top-level Maildir
mu4e-sent-folder "/INBOX.Sent" ; folder for sent messages
mu4e-drafts-folder "/INBOX.Drafts" ; unfinished messages
mu4e-trash-folder "/INBOX.Trash" ; trashed messages
mu4e-refile-folder "/INBOX.Archive" ; saved messages
mu4e-get-mail-command "offlineimap" ; offlineimap to fetch mail
mu4e-compose-signature "- Lars" ; Sign my name
mu4e-update-interval (* 5 60) ; update every 5 min
mu4e-confirm-quit nil ; just quit
mu4e-view-show-images t ; view images
mu4e-html2text-command
"html2text -utf8") ; use utf-8
;; Setup for sending mail.
(setq user-full-name
"Lars Tveito" ; Your full name
user-mail-address
"larstvei@ifi.uio.no" ; And email-address
smtpmail-smtp-server
"smtp.uio.no" ; Host to mail-server
smtpmail-smtp-service 465 ; Port to mail-server
smtpmail-stream-type 'ssl ; Protocol used for sending
send-mail-function 'smtpmail-send-it ; Use smpt to send
mail-user-agent 'mu4e-user-agent) ; Use mu4e!
;; Register file types that can be handled by ImageMagick.
(when (fboundp 'imagemagick-register-types)
(imagemagick-register-types))))
(autoload 'mu4e "mu4e" nil t)
(global-set-key (kbd "C-x m") 'mu4e))
;; Flyspell
;; Flyspell offers on-the-fly spell checking. We can enable flyspell for all
;; text-modes with this snippet.
(add-hook 'text-mode-hook 'turn-on-flyspell)
;; To use flyspell for programming there is =flyspell-prog-mode=, that only
;; enables spell checking for comments and strings. We can enable it for all
;; programming modes using the =prog-mode-hook=. Flyspell interferes with
;; auto-complete mode, but there is a workaround provided by auto complete.
(add-hook 'prog-mode-hook 'flyspell-prog-mode)
(eval-after-load 'auto-complete
'(ac-flyspell-workaround))
;; When working with several languages, we should be able to cycle through
;; the languages we most frequently use. Every buffer should have a separate
;; cycle of languages, so that cycling in one buffer does not change the
;; state in a different buffer (this problem occurs if you only have one
;; global cycle). We can implement this by using a [[http://www.gnu.org/software/emacs/manual/html_node/elisp/Closures.html][closure]].
(defun cycle-languages ()
"Changes the ispell dictionary to the first element in
ISPELL-LANGUAGES, and returns an interactive function that cycles
the languages in ISPELL-LANGUAGES when invoked."
(lexical-let ((ispell-languages '#1=("american" "norsk" . #1#)))
(ispell-change-dictionary (car ispell-languages))
(lambda ()
(interactive)
;; Rotates the languages cycle and changes the ispell dictionary.
(ispell-change-dictionary
(car (setq ispell-languages (cdr ispell-languages)))))))
;; =Flyspell= signals an error if there is no spell-checking tool is
;; installed. We can advice =turn-on-flyspell= and =flyspell-prog-mode= to
;; only try to enable =flyspell= if a spell-checking tool is available. Also
;; we want to enable cycling the languages by typing =C-c l=, so we bind the
;; function returned from =cycle-languages=.
(defadvice turn-on-flyspell (before check nil activate)
"Turns on flyspell only if a spell-checking tool is installed."
(when (executable-find ispell-program-name)
(local-set-key (kbd "C-c l") (cycle-languages))))
(defadvice flyspell-prog-mode (before check nil activate)
"Turns on flyspell only if a spell-checking tool is installed."
(when (executable-find ispell-program-name)
(local-set-key (kbd "C-c l") (cycle-languages))))
;; Org
;; I use =org-agenda= for appointments and such.
(setq org-agenda-start-on-weekday nil ; Show agenda from today.
org-agenda-files '("~/Dropbox/cal.org") ; A list of agenda files.
org-agenda-default-appointment-duration 120) ; 2 hours appointments.
;; When editing org-files with source-blocks, we want the source blocks to
;; be themed as they would in their native mode.
(setq org-src-fontify-natively t
org-confirm-babel-evaluate nil)
;; This is quite an ugly fix for allowing code markup for expressions like
;; ="this string"=, because the quotation marks causes problems.
;;(require 'org)
(eval-after-load "org"
'(progn
(setcar (nthcdr 2 org-emphasis-regexp-components) " \t\n,")
(custom-set-variables `(org-emphasis-alist ',org-emphasis-alist))))
;; Interactive functions
;; <<sec:defuns>>
;; To search recent files useing =ido-mode= we add this snippet from
;; [[http://www.emacswiki.org/emacs/CalendarWeekNumbers][EmacsWiki]].
(defun recentf-ido-find-file ()
"Find a recent file using Ido."
(interactive)
(let ((f (ido-completing-read "Choose recent file: " recentf-list nil t)))
(when f
(find-file f))))
;; =just-one-space= removes all whitespace around a point - giving it a
;; negative argument it removes newlines as well. We wrap a interactive
;; function around it to be able to bind it to a key. In Emacs 24.4
;; =cycle-spacing= was introduced, and it works like just one space, but
;; when run in succession it cycles between one, zero and the original
;; number of spaces.
(defun cycle-spacing-delete-newlines ()
"Removes whitespace before and after the point."
(interactive)
(if (version< emacs-version "24.4")
(just-one-space -1)
(cycle-spacing -1)))
;; Often I want to find other occurrences of a word I'm at, or more
;; specifically the symbol (or tag) I'm at. The
;; =isearch-forward-symbol-at-point= in Emacs 24.4 works well for this, but
;; I don't want to be bothered with the =isearch= interface. Rather jump
;; quickly between occurrences of a symbol, or if non is found, don't do
;; anything.
(defun jump-to-symbol-internal (&optional backwardp)
"Jumps to the next symbol near the point if such a symbol
exists. If BACKWARDP is non-nil it jumps backward."
(let* ((point (point))
(bounds (find-tag-default-bounds))
(beg (car bounds)) (end (cdr bounds))
(str (isearch-symbol-regexp (find-tag-default)))
(search (if backwardp 'search-backward-regexp
'search-forward-regexp)))
(goto-char (if backwardp beg end))
(funcall search str nil t)
(cond ((<= beg (point) end) (goto-char point))
(backwardp (forward-char (- point beg)))
(t (backward-char (- end point))))))
(defun jump-to-previous-like-this ()
"Jumps to the previous occurrence of the symbol at point."
(interactive)
(jump-to-symbol-internal t))
(defun jump-to-next-like-this ()
"Jumps to the next occurrence of the symbol at point."
(interactive)
(jump-to-symbol-internal))
;; I sometimes regret killing the =*scratch*=-buffer, and have realized I
;; never want to actually kill it. I just want to get it out of the way, and
;; clean it up. The function below does just this for the
;; =*scratch*=-buffer, and works like =kill-this-buffer= for any other
;; buffer. It removes all buffer content and buries the buffer (this means
;; making it the least likely candidate for =other-buffer=).
(defun kill-this-buffer-unless-scratch ()
"Works like `kill-this-buffer' unless the current buffer is the
*scratch* buffer. In witch case the buffer content is deleted and
the buffer is buried."
(interactive)
(if (not (string= (buffer-name) "*scratch*"))
(kill-this-buffer)
(delete-region (point-min) (point-max))
(switch-to-buffer (other-buffer))
(bury-buffer "*scratch*")))
;; To duplicate either selected text or a line we define this interactive
;; function.
(defun duplicate-thing (comment)
"Duplicates the current line, or the region if active. If an argument is
given, the duplicated region will be commented out."
(interactive "P")
(save-excursion
(let ((start (if (region-active-p) (region-beginning) (point-at-bol)))
(end (if (region-active-p) (region-end) (point-at-eol))))
(goto-char end)
(unless (region-active-p)
(newline))
(insert (buffer-substring start end))
(when comment (comment-region start end)))))
;; To tidy up a buffer we define this function borrowed from [[https://github.com/simenheg][simenheg]].
(defun tidy ()
"Ident, untabify and unwhitespacify current buffer, or region if active."
(interactive)
(let ((beg (if (region-active-p) (region-beginning) (point-min)))
(end (if (region-active-p) (region-end) (point-max))))
(indent-region beg end)
(whitespace-cleanup)
(untabify beg (if (< end (point-max)) end (point-max)))))
;; Advice
;; An advice can be given to a function to make it behave differently. This
;; advice makes =eval-last-sexp= (bound to =C-x C-e=) replace the sexp with
;; the value.
(defadvice eval-last-sexp (around replace-sexp (arg) activate)
"Replace sexp when called with a prefix argument."
(if arg
(let ((pos (point)))
ad-do-it
(goto-char pos)
(backward-kill-sexp)
(forward-sexp))
ad-do-it))
;; When interactively changing the theme (using =M-x load-theme=), the
;; current custom theme is not disabled. This often gives weird-looking
;; results; we can advice =load-theme= to always disable themes currently
;; enabled themes.
(defadvice load-theme
(before disable-before-load (theme &optional no-confirm no-enable) activate)
(mapc 'disable-theme custom-enabled-themes))
;; Presentation-mode
;; When giving talks it's nice to be able to scale the text
;; globally. =text-scale-mode= works great for a single buffer, this advice
;; makes this work globally.
(defadvice text-scale-mode (around all-buffers (arg) activate)
(if (not global-text-scale-mode)
ad-do-it
(setq-default text-scale-mode-amount text-scale-mode-amount)
(dolist (buffer (buffer-list))
(with-current-buffer buffer
ad-do-it))))
;; We don't want this to be default behavior, so we can make a global mode
;; from the =text-scale-mode=, using =define-globalized-minor-mode=.
(require 'face-remap)
(define-globalized-minor-mode
global-text-scale-mode
text-scale-mode
(lambda () (text-scale-mode 1)))
;; Shell
;; I use =shell= whenever i want to use access the command line in Emacs. I
;; keep a symlink between my =~/.bash_profile= (because I run OS X) and
;; =~/.emacs_bash=, to make the transition between my standard terminal and
;; the shell as small as possible. To be able to quickly switch back and
;; forth between a shell I make use of this little function.
(defun toggle-shell ()
"Jumps to eshell or back."
(interactive)
(if (string= (buffer-name) "*shell*")
(switch-to-prev-buffer)
(shell)))
;; I'd like the =C-l= to work more like the standard terminal (which works
;; like running =clear=), and resolve this by simply removing the
;; buffer-content. Mind that this is not how =clear= works, it simply adds a
;; bunch of newlines, and puts the prompt at the top of the window, so it
;; does not remove anything. In Emacs removing stuff is less of a worry,
;; since we can always undo!
(defun clear-comint ()
"Runs `comint-truncate-buffer' with the
`comint-buffer-maximum-size' set to zero."
(interactive)
(let ((comint-buffer-maximum-size 0))
(comint-truncate-buffer)))
;; Lastly we should bind our functions. The =toggle-shell= should be a
;; global binding (because we want to be able to switch to a shell from any
;; buffer), but the =clear-shell= should only affect =shell-mode=.
(add-hook 'comint-mode-hook (lambda () (local-set-key (kbd "C-l") 'clear-comint)))
;; Lisp
;; =Pretty-lambda= provides a customizable variable
;; =pretty-lambda-auto-modes= that is a list of common lisp modes. Here we
;; can add some extra lisp-modes. We run the =pretty-lambda-for-modes=
;; function to activate =pretty-lambda-mode= in lisp modes.
(dolist (mode '(slime-repl-mode geiser-repl-mode ielm-mode clojure-mode
cider-repl-mode))
(add-to-list 'pretty-lambda-auto-modes mode))
(pretty-lambda-for-modes)
;; I use =Paredit= when editing lisp code, we enable this for all lisp-modes
;; in the =pretty-lambda-auto-modes= list.
(dolist (mode pretty-lambda-auto-modes)
;; add paredit-mode to all mode-hooks
(add-hook (intern (concat (symbol-name mode) "-hook")) 'paredit-mode))
;; Emacs Lisp
;; In =emacs-lisp-mode= we can enable =eldoc-mode= to display information
;; about a function or a variable in the echo area.
(add-hook 'emacs-lisp-mode-hook 'turn-on-eldoc-mode)
(add-hook 'lisp-interaction-mode-hook 'turn-on-eldoc-mode)
;; Common lisp
;; I use [[http://www.common-lisp.net/project/slime/][Slime]] along with =lisp-mode= to edit Common Lisp code. Slime
;; provides code evaluation and other great features, a must have for a
;; Common Lisp developer. [[http://www.quicklisp.org/beta/][Quicklisp]] is a library manager for Common Lisp,
;; and you can install Slime following the instructions from the site along
;; with this snippet.
(defun activate-slime-helper ()
(when (file-exists-p "~/.quicklisp/slime-helper.elc")
(load (expand-file-name "~/.quicklisp/slime-helper.elc"))
(define-key slime-repl-mode-map (kbd "C-l")
'slime-repl-clear-buffer))
(remove-hook 'lisp-mode-hook #'activate-slime-helper))
(add-hook 'lisp-mode-hook #'activate-slime-helper)
;; We can specify what Common Lisp program Slime should use (I use SBCL).
(setq inferior-lisp-program "sbcl")
;; To improve auto completion for Common Lisp editing we can use =ac-slime=
;; which uses slime completions as a source.
(add-hook 'slime-mode-hook 'set-up-slime-ac)
(add-hook 'slime-repl-mode-hook 'set-up-slime-ac)
(eval-after-load "auto-complete"
'(add-to-list 'ac-modes 'slime-repl-mode))
;; More sensible =loop= indentation, borrowed from [[https://github.com/simenheg][simenheg]].
(setq lisp-loop-forms-indentation 6
lisp-simple-loop-indentation 2
lisp-loop-keyword-indentation 6)
;; Scheme
;; [[http://www.nongnu.org/geiser/][Geiser]] provides features similar to Slime for Scheme editing. Everything
;; works pretty much out of the box, we only need to add auto completion,
;; and specify which scheme-interpreter we prefer.
(add-hook 'geiser-mode-hook 'ac-geiser-setup)
(add-hook 'geiser-repl-mode-hook 'ac-geiser-setup)
(eval-after-load "auto-complete"
'(add-to-list 'ac-modes 'geiser-repl-mode))
(eval-after-load "geiser"
'(add-to-list 'geiser-active-implementations 'plt-r5rs)) ;'(racket))
;; Java and C
;; The =c-mode-common-hook= is a general hook that work on all C-like
;; languages (C, C++, Java, etc...). I like being able to quickly compile
;; using =C-c C-c= (instead of =M-x compile=), a habit from =latex-mode=.
(defun c-setup ()
(local-set-key (kbd "C-c C-c") 'compile))
(add-hook 'c-mode-common-hook 'c-setup)
;; Some statements in Java appear often, and become tedious to write
;; out. We can use abbrevs to speed this up.
(define-abbrev-table 'java-mode-abbrev-table
'(("psv" "public static void main(String[] args) {" nil 0)
("sopl" "System.out.println" nil 0)
("sop" "System.out.printf" nil 0)))
;; To be able to use the abbrev table defined above, =abbrev-mode= must be
;; activated.
(defun java-setup ()
(abbrev-mode t)
(setq-local compile-command (concat "javac " (buffer-name))))
(add-hook 'java-mode-hook 'java-setup)
;; Assembler
;; When writing assembler code I use =#= for comments. By defining
;; =comment-start= we can add comments using =M-;= like in other programming
;; modes. Also in assembler should one be able to compile using =C-c C-c=.
(defun asm-setup ()
(setq comment-start "#")
(local-set-key (kbd "C-c C-c") 'compile))
(add-hook 'asm-mode-hook 'asm-setup)
;; LaTeX
;; =.tex=-files should be associated with =latex-mode= instead of
;; =tex-mode=.
(add-to-list 'auto-mode-alist '("\\.tex\\'" . latex-mode))
;; I like using the [[https://code.google.com/p/minted/][Minted]] package for source blocks in LaTeX. To make org
;; use this we add the following snippet.
(eval-after-load 'org
'(add-to-list 'org-latex-packages-alist '("" "minted")))
(setq org-latex-listings 'minted)
;; Because [[https://code.google.com/p/minted/][Minted]] uses [[http://pygments.org][Pygments]] (an external process), we must add the
;; =-shell-escape= option to the =org-latex-pdf-process= commands. The
;; =tex-compile-commands= variable controls the default compile command for
;; Tex- and LaTeX-mode, we can add the flag with a rather dirty statement
;; (if anyone finds a nicer way to do this, please let me know).
(eval-after-load 'ox-latex
'(setq org-latex-pdf-process
(mapcar
(lambda (str)
(concat "pdflatex -shell-escape "
(substring str (string-match "-" str))))
org-latex-pdf-process)))
(eval-after-load 'tex-mode
'(setcar (cdr (cddaar tex-compile-commands)) " -shell-escape "))
;; Markdown
;; I sometimes use a specialized markdown format, where inline math-blocks
;; can be achieved by surrounding a LaTeX formula with =$math$= and
;; =$/math$=. Writing these out became tedious, so I wrote a small function.
(defun insert-markdown-inline-math-block ()
"Inserts an empty math-block if no region is active, otherwise wrap a
math-block around the region."
(interactive)
(let* ((beg (region-beginning))
(end (region-end))
(body (if (region-active-p) (buffer-substring beg end) "")))
(when (region-active-p)
(delete-region beg end))
(insert (concat "$math$ " body " $/math$"))
(search-backward " $/math$")))
;; Most of my writing in this markup is in Norwegian, so the dictionary is
;; set accordingly. The markup is also sensitive to line breaks, so
;; =auto-fill-mode= is disabled. Of course we want to bind our lovely
;; function to a key!
(add-hook 'markdown-mode-hook
(lambda ()
(auto-fill-mode 0)
(ispell-change-dictionary "norsk")
(local-set-key (kbd "C-c b") 'insert-markdown-inline-math-block)) t)
;; Haskell
;; =haskell-doc-mode= is similar to =eldoc=, it displays documentation in
;; the echo area. Haskell has several indentation modes - I prefer using
;; =haskell-indent=.
(add-hook 'haskell-mode-hook 'turn-on-haskell-doc-mode)
(add-hook 'haskell-mode-hook 'turn-on-haskell-indent)
;; Matlab
;; =Matlab-mode= works pretty good out of the box, but we can do without the
;; splash screen.
(eval-after-load 'matlab
'(add-to-list 'matlab-shell-command-switches "-nosplash"))
;; Key bindings
;; Inspired by [[http://stackoverflow.com/questions/683425/globally-override-key-binding-in-emacs][this StackOverflow post]] I keep a =custom-bindings-map= that
;; holds all my custom bindings. This map can be activated by toggling a
;; simple =minor-mode= that does nothing more than activating the map. This
;; inhibits other =major-modes= to override these bindings. I keep this at
;; the end of the init-file to make sure that all functions are actually
;; defined.
(defvar custom-bindings-map (make-keymap)
"A keymap for custom bindings.")
;; Bindings for [[https://github.com/magnars/expand-region.el][expand-region]].
(define-key custom-bindings-map (kbd "C-'") 'er/expand-region)
(define-key custom-bindings-map (kbd "C-\"") 'er/contract-region)
;; Bindings for [[https://github.com/magnars/multiple-cursors.el][multiple-cursors]].
(define-key custom-bindings-map (kbd "C-c e") 'mc/edit-lines)
(define-key custom-bindings-map (kbd "C-c a") 'mc/mark-all-like-this)
(define-key custom-bindings-map (kbd "C-c n") 'mc/mark-next-like-this)
;; Bindings for [[http://magit.github.io][Magit]].
(define-key custom-bindings-map (kbd "C-c m") 'magit-status)
;; Bindings for [[https://github.com/winterTTr/ace-jump-mode][ace-jump-mode]].
(define-key custom-bindings-map (kbd "C-c SPC") 'ace-jump-mode)
;; Bindings for [[http://emacs-helm.github.io/helm/][Helm]].
(define-key custom-bindings-map (kbd "C-c h g") 'helm-google-suggest)
;; Bindings for [[https://github.com/nonsequitur/smex][smex]]. This overrides the standard =M-x=.
(define-key custom-bindings-map (kbd "M-x") 'smex)
;; Bindings for =move-text=.
(define-key custom-bindings-map (kbd "<M-S-up>") 'move-text-up)
(define-key custom-bindings-map (kbd "<M-S-down>") 'move-text-down)
;; Bind some native Emacs functions.
(define-key custom-bindings-map (kbd "C-j") 'newline-and-indent)
(define-key custom-bindings-map (kbd "C-c s") 'ispell-word)
(define-key custom-bindings-map (kbd "C-c t") 'org-agenda-list)
(define-key custom-bindings-map (kbd "C-x C-r") 'recentf-ido-find-file)
;; Bind the functions defined [[sec:defuns][above]].
(define-key global-map (kbd "M-p") 'jump-to-previous-like-this)
(define-key global-map (kbd "M-n") 'jump-to-next-like-this)
(define-key custom-bindings-map (kbd "M-,") 'jump-to-previous-like-this)
(define-key custom-bindings-map (kbd "M-.") 'jump-to-next-like-this)
(define-key custom-bindings-map (kbd "C-c .") (cycle-themes))
(define-key custom-bindings-map (kbd "C-x k") 'kill-this-buffer-unless-scratch)
(define-key custom-bindings-map (kbd "C-x t") 'toggle-shell)
(define-key custom-bindings-map (kbd "C-c j") 'cycle-spacing-delete-newlines)
(define-key custom-bindings-map (kbd "C-c d") 'duplicate-thing)
(define-key custom-bindings-map (kbd "<C-tab>") 'tidy)
;; Lastly we need to activate the map by creating and activating the
;; =minor-mode=.
(define-minor-mode custom-bindings-mode
"A mode that activates custom-bindings."
t nil custom-bindings-map)
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