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@seancribbs seancribbs/init.el
Last active Aug 22, 2017

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seancribbs.com/emacs.d
;; Use org-babel to load config
(require 'org)
(org-babel-load-file (expand-file-name "seancribbs.org" user-emacs-directory))

Sean Cribbs’ Emacs 24 Configuration

Introduction

Inspired by Aaron Bedra’s emacs configuration, I have converted mine to an org-mode file as well. This should improve load speed over my bespoke number-oriented-multi-file config, as well as improve documentation of my settings. You might notice a few things lifted directly from Aaron’s config.

Startup

I want to do a few things early in the startup process, like cleanup some of Emacs’ less savory defaults, so these come first. I’m also trying to wean myself off of emacs-starter-kit, so things that it does early in the startup process that I want to co-opt will go in this section.

Environment

There are plenty of things installed outside of the default PATH. This allows me to establish additional PATH information. At the moment, the only things that added are /usr/local/bin for homebrew on OS X.

Sadly, there’s no built-in variable pointing to the user’s home directory, so I pull that out based on the environment variable HOME, or failing that, the parent directory of the Emacs configuration.

I also keep some non-ELPA things in my emacs directory.

(setenv "PATH" (concat "/usr/local/bin:/opt/local/bin:/usr/bin:/bin" (getenv "PATH")))

(defconst user-home-directory
  (or (getenv "HOME")
      (expand-file-name ".." user-emacs-directory))
  "The user's home directory.")

(add-to-list 'load-path (expand-file-name "site-lisp" user-emacs-directory))

Common Lisp for Emacs

Emacs lisp is really only a subset of common lisp, and I need to have some of the additional functionality to make the configuration and its dependencies work properly, which we get by requiring Common Lisp for Emacs.

(require 'cl)

Key Bindings

Miscellaneous keybindings that don’t belong anywhere else. I use Option as super and Command as meta on OS/X.

(setq mac-option-modifier 'super)
(setq mac-command-modifier 'meta)

(global-set-key (kbd "C-S-k") 'delete-region)
(global-set-key (kbd "C-s") 'isearch-forward-regexp)
(global-set-key (kbd "C-r") 'isearch-backward-regexp)
(global-set-key (kbd "M-%") 'query-replace-regexp)
(global-set-key (kbd "C-M-s") 'isearch-forward)
(global-set-key (kbd "C-M-r") 'isearch-backward)
(global-set-key (kbd "C-M-%") 'query-replace)

(setq imenu-auto-rescan t)
(global-set-key (kbd "C-x TAB") 'imenu)

(put 'upcase-region 'disabled nil)

Yes and No

Nobody likes to have to type out the full yes or no when Emacs asks. Which it does often. Make it one character.

(defalias 'yes-or-no-p 'y-or-n-p)

Backup Files

I hate backup files just as much as the next person. This is why we have version control systems, people.

(setq make-backup-files nil)
(setq backup-directory-alist `((".*" . ,temporary-file-directory)))
(setq auto-save-file-name-transforms `((".*" ,temporary-file-directory t)))

Marking text

There are some behaviors in Emacs that aren’t intuitive related to marking text. Specifically, typing or yanking into the selected region should replace it (delete-selection-mode), and when the buffer is changed, the region is de-selected (transient-mark-mode).

(delete-selection-mode t)
(transient-mark-mode t)

Server

I use emacsclient obsessively, especially via my shell alias e, which is mapped to emacsclient -n. In order for this to work, you have to start the “server”.

(require 'server)
(server-start)

Packages

Since Emacs 24, Emacs includes the Emacs Lisp Package Archive (ELPA) by default. This provides a nice way to install additional packages. Since the default package archive doesn’t include everything necessary, the marmalade, and melpa repositories are also added. This also prefetches the package list if we don’t have a cached copy yet.

(require 'package)
(package-initialize)

(add-to-list 'package-archives
             '("marmalade" . "http://marmalade-repo.org/packages/"))
(add-to-list 'package-archives
             '("melpa" . "http://melpa.milkbox.net/packages/") t)

(setq package-archive-enable-alist '(("melpa" magit graphviz-dot-mode lua-mode elixir-mode elixir-yasnippets flymake-elixir)))

(when (not package-archive-contents)
  (package-refresh-contents))

Define packages

This is the list of packages used in this configuration. I start with major modes and enhancements first, add flymake, and then utilities and themes.

(defvar seancribbs/packages
  '(
    clojure-mode
    elixir-mode
    elixir-yasnippets
    graphviz-dot-mode
    haskell-mode
    inf-ruby
    js2-mode
    lua-mode
    markdown-mode
    mmm-mode
    php-mode
    protobuf-mode
    python-mode
    rspec-mode
    ruby-end
    scala-mode
    wc-mode
    web-mode
    yaml-mode

    flymake
    flymake-easy
    flymake-elixir
    flymake-lua
    flymake-ruby
    flymake-haskell-multi

    org-present

    ag
    auto-complete
    dash-at-point
    expand-region
    highlight
    hlinum
    ido-ubiquitous
    magit
    minimap
    neotree
    paredit
    smex
    htmlize

    ir-black-theme
    solarized-theme
    twilight-theme
    underwater-theme
   )
)

Install default packages

When Emacs boots, check to make sure all of the packages defined in seancribbs/packages are installed. If not, have ELPA take care of it.

(dolist (p seancribbs/packages)
  (when (not (package-installed-p p))
    (package-install p)))

Visual tweaks

Window chrome

Most people don’t use menu-bar-mode, but some things provided by my add-ons don’t have key combos bound to the menu items they create, so I enable it. Unfortunately it doesn’t help things in console mode, so I only enable it in graphical modes.

The default frame title leaves a bit to be desired, so both Aaron’s and ESK’s config include the next tweak.

I don’t want to hear audible bells or see the splash screen, so those are disabled.

(when window-system
  (menu-bar-mode 1)
  (setq frame-title-format '(buffer-file-name "%f" ("%b"))))

(tool-bar-mode -1)
(scroll-bar-mode -1)

(setq visible-bell t
      inhibit-splash-screen t
      inhibit-startup-message t
      initial-scratch-message nil)

Font

I’ve used DejaVu Sans Mono for years. Thanks, Aaron, for making this easier for me to set! It’s also nice to be able to quickly tweak the text size.

(when window-system
  (when (functionp 'set-fontset-font)
   (set-fontset-font "fontset-default"
                     'unicode
                     (font-spec :family "DejaVu Sans Mono"
                                :width 'normal
                                :size 12.4
                                :weight 'normal))))

(global-set-key (kbd "C-+") 'text-scale-increase)
(global-set-key (kbd "C--") 'text-scale-decrease)

Theme

I use the solarized-light theme most of the time, so I figure it should startup in that theme.

(load-theme 'solarized-light t)

Window Resizing

Following this are some experimental keys that I’ve been trying so I can easily grow or shrink a window split. I’m not particularly happy with them yet.

(global-set-key (kbd "s-<right>") 'enlarge-window-horizontally)
(global-set-key (kbd "s-<left>") 'shrink-window-horizontally)
(global-set-key (kbd "s-<up>") 'enlarge-window)
(global-set-key (kbd "s-<down>") 'shrink-window)

Buffer management

Switching buffers should be easy and fast, and killing them too. And sometimes, you just have to declare buffer-bankruptcy.

(global-set-key (kbd "M-]") 'next-buffer)
(global-set-key (kbd "M-[") 'previous-buffer)

(defun kill-current-buffer ()
  "Kills the current buffer"
  (interactive)
  (kill-buffer (buffer-name)))
(global-set-key (kbd "C-x C-k") 'kill-current-buffer)

(defun nuke-all-buffers ()
  "Kill all buffers, leaving *scratch* only"
  (interactive)
  (mapcar (lambda (x) (kill-buffer x))
          (buffer-list))
  (delete-other-windows))
(global-set-key (kbd "C-x C-S-k") 'nuke-all-buffers)

(global-set-key (kbd "C-c r") 'revert-buffer)

Whitespace

I like to see where the unnecessary whitespace is in all programming modes, and have a quick key to clean it up. There shall be no tabs in my files, only spaces. I’d also like to quickly reindent an entire buffer according to the modes’ electric indentation. The last three functions were copied from ESK.

(require 'whitespace)

(unless (member 'whitespace-mode prog-mode-hook)
  (add-hook 'prog-mode-hook 'whitespace-mode))
(global-set-key (kbd "C-c w") 'whitespace-cleanup)
(set-default 'indicate-empty-lines t)
(set-default 'indent-tabs-mode nil)
(setq whitespace-style '(face trailing lines-tail tabs)
      whitespace-line-column 80)

(defun seancribbs/untabify-buffer ()
  (interactive)
  (untabify (point-min) (point-max)))

(defun seancribbs/indent-buffer ()
  (interactive)
  (indent-region (point-min) (point-max)))

(defun seancribbs/cleanup-buffer ()
  "Perform a bunch of operations on the whitespace content of a buffer."
  (interactive)
  (seancribbs/indent-buffer)
  (seancribbs/untabify-buffer)
  (delete-trailing-whitespace))

(global-set-key (kbd "C-c n") 'seancribbs/cleanup-buffer)

Modeline

The Emacs modeline contains helpful status information. I turn on column and line numbers globally.

(line-number-mode 1)
(column-number-mode 1)

Highlights

I took these customizations from ESK. First, it’s always nice to quickly see what line you’re on, and then when you put in watchwords, those should show up highlighted. I’d also like to see matching parens so I can be sure my code is structured correctly.

(defun seancribbs/turn-on-hl-line-mode ()
  (when (> (display-color-cells) 8)
    (hl-line-mode t)))

(defun seancribbs/add-watchwords ()
  (font-lock-add-keywords
   nil '(("\\<\\(FIX\\(ME\\)?\\|TODO\\|HACK\\|REFACTOR\\|NOCOMMIT\\)"
          1 font-lock-warning-face t))))

(add-hook 'prog-mode-hook 'seancribbs/turn-on-hl-line-mode)
(add-hook 'prog-mode-hook 'seancribbs/add-watchwords)

(show-paren-mode t)

Major modes

Programming Modes

These customizations I like to use in all “programming modes”, i.e. modes derived from prog-mode. The main change here is that I find comment-dwim to not “do what I mean” in most cases, so I use this function that used to be part of ESK or some dependency of it. Instead of inserting a comment at the end-of-line, it will toggle commenting out the current line. Unfortunately the key I’m used to is usually occupied by dabbrev-expand, so I assign that to something else.

(defun comment-or-uncomment-region-or-line ()
    "Comments or uncomments the region or the current line if there's no active region."
    (interactive)
    (let (beg end)
        (if (region-active-p)
            (setq beg (region-beginning) end (region-end))
            (setq beg (line-beginning-position) end (line-end-position)))
        (comment-or-uncomment-region beg end)))

(global-set-key (kbd "M-/") 'comment-or-uncomment-region-or-line)
(global-set-key (kbd "M-\\") 'dabbrev-expand)

Flymake

Flymake is super-useful for finding dumb errors in my source files by running compilation in the background. This adds a key to easily jump to the next error in the current buffer.

(defun seancribbs/flymake-keys ()
  "Adds keys for navigating between errors found by Flymake."
  (local-set-key (kbd "C-c C-n") 'flymake-goto-next-error)
  (local-set-key (kbd "C-c C-p") 'flymake-goto-prev-error))

(add-hook 'flymake-mode-hook 'seancribbs/flymake-keys)

Erlang

I write a lot of Erlang. Unlike most people, I don’t like the all the quirks that come with edts and other “Emacs IDE for Erlang” packages, so I load the mode from the latest OTP I have installed. I also add Quviq QuickCheck and Wrangler.

Find Erlang Mode

There’s a few curiosities here. I use multiple Erlang versions and found kerl too hacky to maintain, so I wrote a few short shell functions to build, install, and switch between versions of OTP I have in $HOME/erlang. This means I need to pull erlang-mode from the latest “tools” application in OTP.

(defconst seancribbs/erlang/root
  "/usr/local/Cellar/erlang"
  "The root directory where various versions of Erlang are installed")

(defvar seancribbs/erlang/latest
  "18.2.1"
  "The latest version of Erlang installed.")

(defvar seancribbs/erlang/latest/tools-version
  "2.8.2"
  "The version of the 'tools' application in the latest Erlang.")

(defun seancribbs/erlang/latest/root ()
  "Computes the root directory of the latest Erlang installed."
  (expand-file-name seancribbs/erlang/latest seancribbs/erlang/root))

(defun seancribbs/erlang/latest/bin ()
  "Computes the latest Erlang's executable directory"
  (expand-file-name "bin" (seancribbs/erlang/latest/root)))

(defun seancribbs/erlang/latest/lib ()
  "Computes the latest Erlang's library directory"
  (expand-file-name "erlang" (expand-file-name "lib" (seancribbs/erlang/latest/root))))

(defun seancribbs/erlang/latest/emacs ()
  "Computes the location of the OTP emacs mode."
  (cl-reduce 'expand-file-name
             (list "emacs"
                   (format "tools-%s" seancribbs/erlang/latest/tools-version)
                   "lib"
                   (seancribbs/erlang/latest/lib))
             :from-end t))

Load Erlang Mode

Now that we have that boilerplate out of the way, we can add the mode. First we add the tools/emacs directory to the load path, set the Erlang root, add its binaries to the executable path and require the mode.

Somehow Erlang mode is not derived from prog-mode, so my usual additions don’t apply, so I need to add them to make it consistent.

(add-to-list 'load-path (seancribbs/erlang/latest/emacs))
(add-to-list 'exec-path (seancribbs/erlang/latest/bin))
(setq erlang-root-dir (seancribbs/erlang/latest/lib))
(require 'erlang-start)

(add-hook 'erlang-mode-hook 'seancribbs/add-watchwords)
(add-hook 'erlang-mode-hook 'seancribbs/turn-on-hl-line-mode)
(add-hook 'erlang-mode-hook 'whitespace-mode)

Additional Files

The OTP emacs mode doesn’t come with some of my commonly used files that are Erlang code or terms.

(add-to-list 'auto-mode-alist '("rebar.config" . erlang-mode)) ;; rebar
(add-to-list 'auto-mode-alist '("rebar.config.script" . erlang-mode)) ;; rebar
(add-to-list 'auto-mode-alist '("app.config" . erlang-mode)) ;; embedded node/riak
;;(add-to-list 'auto-mode-alist '(".riak_test.config" . erlang-mode))
(add-to-list 'auto-mode-alist '("\\.erlang$" . erlang-mode)) ;; User customizations file

Flymake

Flymake is my savior for erlang-mode and requires only a little bit of configuration. For rebar3-based projects, we need to look in the _build/* directories for dependencies, not just in deps/ (not working yet).

(require 'erlang-flymake)
(setq erlang-flymake-command (expand-file-name "erlc" (seancribbs/erlang/latest/bin)))

(defun rebar3/erlang-flymake-get-include-dirs ()
  (append
     (erlang-flymake-get-include-dirs)
     (file-expand-wildcards (concat (erlang-flymake-get-app-dir) "_build/*/lib")))
)

(setq erlang-flymake-get-include-dirs-function 'rebar3/erlang-flymake-get-include-dirs)

(defun rebar3/erlang-flymake-get-code-path-dirs ()
  (append
     (erlang-flymake-get-code-path-dirs)
     (file-expand-wildcards (concat (erlang-flymake-get-app-dir) "_build/*/lib/*/ebin"))))

(setq erlang-flymake-get-code-path-dirs-function 'rebar3/erlang-flymake-get-code-path-dirs)

Erlang QuickCheck (Quviq)

QuickCheck is the best testing tool, and comes with a bunch of helpful templates and shortcut keys for building out property-based tests.

NB: I have disabled this since I no longer have a license.

;;(defvar seancribbs/erlang/eqc-version
;;  "1.34.2"
;;  "The latest version of EQC I have installed.")

;;(defun seancribbs/erlang/eqc/root ()
;;   "Computes the location of the latest EQC app."
;;   (cl-reduce 'expand-file-name
;;              (list (format "eqc-%s" seancribbs/erlang/eqc-version)
;;                    seancribbs/erlang/eqc-version
;;                    "eqc"
;;                    seancribbs/erlang/root)
;;     :from-end t))

;;(add-to-list 'load-path (expand-file-name "emacs" (seancribbs/erlang/eqc/root)))
;;(autoload 'eqc-erlang-mode-hook "eqc-ext" "EQC Mode" t)
;;(add-hook 'erlang-mode-hook 'eqc-erlang-mode-hook)
;;(setq eqc-max-menu-length 30)
;;(setq eqc-root-dir (seancribbs/erlang/eqc/root))

Wrangler

Wrangler is an Erlang refactoring tool that I use less often than other things, but can be super helpful in renaming functions, modules, and extracting common functionality.

(add-to-list 'load-path (expand-file-name "dev/wrangler/elisp" user-home-directory))
(require 'vc)
(require 'wrangler)

(setq wrangler-search-paths '())

(defconst seancribbs/erlang/project-subdirs
  '("src" "test" "deps" "apps"))

(defun seancribbs/erlang/expand-project-path (project-root subdir)
  "Expands a subdirectory"
  (let ((full-path (expand-file-name subdir project-root)))
    (when (file-exists-p full-path)
      (list full-path))))

(defconst seancribbs/erlang/project-root-files-regexp
  (regexp-opt '(".git" "rebar.config")))

(defun seancribbs/erlang/project-root-filter (name)
  (when (not (file-regular-p name))
    (and (not (string-match-p "/\\(deps\\|apps\\)" name))
         (directory-files name nil seancribbs/erlang/project-root-files-regexp)
         )))

(defun seancribbs/erlang/project-root ()
  "Finds the root of a project, based on presence of Git or rebar
  artifacts."
  (locate-dominating-file buffer-file-name 'seancribbs/erlang/project-root-filter))

(defun seancribbs/erlang/wrangler-set-paths ()
  "Sets the wrangler search paths based on the location of the
  current file."
  (interactive)
  (let* ((project-root (expand-file-name (seancribbs/erlang/project-root)))
         (subdir-finder (lambda (subdir) (seancribbs/erlang/expand-project-path project-root subdir))))
    (setq wrangler-search-paths
          (apply 'append (mapcar subdir-finder seancribbs/erlang/project-subdirs)))
    (minibuffer-message "Set wrangler paths to %S" wrangler-search-paths)))

(eval-after-load "erlang"
  '(define-key erlang-mode-map (kbd "C-c C-w !") 'seancribbs/erlang/wrangler-set-paths))

Customizations

Erlang binaries are a pain to type, so I add a function and keybinding that inserts one for me. I’m still getting this one in my fingers.

(defun erlang-insert-binary ()
  "Inserts a binary string into an Erlang buffer and places the
  point between the quotes."
  (interactive)
  (insert "<<\"\">>")
  (backward-char 3)
  )
(eval-after-load "erlang" '(define-key erlang-mode-map (kbd "C-c b") 'erlang-insert-binary))

Lua

Lua is a pretty interesting embeddable scripting language. I’m currently using it inside nginx and luajit from the shell.

For some reason lua-mode defaults to 3-space indent, but all my coworkers use 4.

(require 'lua-mode)
(setq lua-default-application "luajit")
(setq lua-indent-level 4)

Scala

Scala is used by one of the major projects I am working on.

(add-to-list 'auto-mode-alist '(".scala$" . scala-mode))
(add-to-list 'auto-mode-alist '(".sbt$" . scala-mode))

Python

Python’s PEP8 tool is really picky about line-length, so this changes fill-paragraph to flow to narrower widths. I also hate the default of 8-space indentation. 4 is more humane.

(add-hook 'python-mode-hook
          (lambda () (set (make-local-variable 'fill-column) 75)
                     (set (make-local-variable 'tab-width) 4)))

Ruby

The default auto-mode list for Ruby is insufficient. I also want to edit ERB files using MMM’s ERB mode. One also shouldn’t edit Rubinius compiler output.

(require 'ruby-mode)
(require 'mmm-erb)

(add-to-list 'auto-mode-alist '("Guardfile$" . ruby-mode))
(add-to-list 'auto-mode-alist '("Assetfile$" . ruby-mode))
(add-to-list 'auto-mode-alist '(".html.erb" . html-erb-mode))

(add-to-list 'completion-ignored-extensions ".rbc")
(add-to-list 'completion-ignored-extensions ".rbo")

Haskell

I’m learning Haskell. haskell-mode makes you choose an indentation strategy, so I’m using haskell-indentation-mode right now.

(add-hook 'haskell-mode-hook 'haskell-indentation-mode)

JavaScript

We should edit JSON files in JavaScript mode.

(add-to-list 'auto-mode-alist '("\\.json$" . js-mode))

Emacs Lisp

ElDoc and paredit make editing Emacs Lisp a lot easier.

(add-hook 'emacs-lisp-mode-hook 'eldoc-mode)
(add-hook 'emacs-lisp-mode-hook 'paredit-mode)
(define-key read-expression-map (kbd "TAB") 'lisp-complete-symbol)
(define-key lisp-mode-shared-map (kbd "RET") 'reindent-then-newline-and-indent)
(define-key emacs-lisp-mode-map (kbd "C-c v") 'eval-buffer)

Clojure

I’m starting to use a little Clojure with riemann, but paredit is off by default.

(add-hook 'clojure-mode-hook (lambda () (paredit-mode t)))

Org

I co-opted a lot of these org-mode customizations from Aaron.

org-present is for doing presentations direct from org-mode. I added hide-mode-line so that you don’t get the modeline noise while presenting. It is not available as a package but you can download it: http://webonastick.com/emacs-lisp/hide-mode-line.el

(require 'ob)

(org-babel-do-load-languages
 'org-babel-load-languages
 '((sh . t)
   (dot . t)
   (ruby . t)
   (js . t)
   (C . t)))

(add-to-list 'org-src-lang-modes (quote ("dot". graphviz-dot)))

(setq org-src-fontify-natively t)

(require 'org-present)
(require 'hide-mode-line)

(define-key org-present-mode-keymap (kbd "q") 'org-present-quit)

(defun seancribbs/org-present-hook ()
  "Entry hook for org-present mode"
  (window-configuration-to-register :org-present-register)
  (delete-other-windows)
  (org-present-big)
  (org-display-inline-images)
  (hide-mode-line-in (current-buffer)))

(add-hook 'org-present-mode-hook 'seancribbs/org-present-hook)

(defun seancribbs/org-present-quit-hook ()
  "Entry hook for org-present mode"
  (org-present-small)
  (org-remove-inline-images)
  (show-mode-line-in (current-buffer))
  (redraw-display)
  (when (get-register :org-present-register)
    (jump-to-register :org-present-register)))

(add-hook 'org-present-mode-quit-hook 'seancribbs/org-present-quit-hook)

Markdown

Most of my Markdown editing uses Github-flavored, so I use gfm-mode instead of the regular markdown-mode.

(add-to-list 'auto-mode-alist '(".md$" . gfm-mode))

Text

I like my text modes to auto-wrap paragraphs.

I did a project for a little while where I tried to write 750 words a day, to improve my writing skills. I didn’t get very far, but I added wc-mode and a quick keychord to launch it.

(add-hook 'text-mode-hook 'turn-on-auto-fill)

(require 'wc-mode)

(defun open-daily-writing ()
  "Open today's writing file"
  (interactive)
  (let ((filename (format-time-string "%Y-%m-%d.txt")))
    (find-file (concat user-home-directory "/notes/writing/"
                       filename))
    (with-current-buffer filename
      (wc-mode t)
      (wc-set-word-goal 750))
    )
  (delete-other-windows))

(global-set-key (kbd "C-x C-S-W") 'open-daily-writing)

Graphviz

Graphviz dot is great for quickly specifying graphs.

;; NB: (require 'graphviz-dot-mode) doesn't work because the file
;; doesn't have a (provide), but it does have an autoload.
(setq graphviz-dot-dot-program "/usr/local/bin/dot"
      graphviz-dot-indent-width 4)

LaTeX

I use LaTeX for papers and sometimes presentations in Beamer.

Fontifying sub/superscripts can be incredibly annoying, especially when your file contains source code that might have underscores, so I turn off tex-fontify-script.

(require 'tex-mode)

(defvar texlive-bin
  "/usr/local/texlive/2014/bin/x86_64-darwin"
  "The location of the TeXlive distribution binaries.")

(setq latex-run-command (concat (expand-file-name "pdflatex" texlive-bin) " -shell-escape")
      tex-bibtex-command (expand-file-name "bibtex" texlive-bin)
      tex-fontify-script nil)

Utilities

Uniquify

uniquify is a built-in library that renames buffers according to relative paths instead of adding numbers to the names like foo.txt<2>.

(require 'uniquify)
(setq uniquify-buffer-name-style 'forward)

Ido

Ido mode provides a nice way to navigate the filesystem. These tweaks come from ESK.

(ido-mode t)
(ido-ubiquitous-mode)
(setq ido-enable-prefix nil
      ido-enable-flex-matching t
      ido-auto-merge-work-directories-length nil
      ido-create-new-buffer 'always
      ido-use-filename-at-point 'guess
      ido-use-virtual-buffers t
      ido-handle-duplicate-virtual-buffers 2
      ido-max-prospects 10)

(global-set-key (kbd "C-x M-f") 'ido-find-file-other-window)

ffap

Find file at point is useful for jumping between files based on the word pointed at, e.g. Erlang modules in the current directory.

(require 'ffap)

Smex

smex is a necessity. It provides history and searching on top of M-x.

(setq smex-save-file (expand-file-name ".smex-items" user-emacs-directory))
(smex-initialize)
(global-set-key (kbd "M-x") 'smex)
(global-set-key (kbd "M-X") 'smex-major-mode-commands)

Magit

Magit is the best VCS tool I’ve ever used. It makes all sorts of things in git easier.

I add an advice around launching Magit that saves and restores the previous window configuration when exiting. This lets you “fullscreen” changes and other VCS windows, then quickly return to your previously opened buffers and windows.

I also set the diff switches to use unified diffs, which ESK also does.

(setq magit-last-seen-setup-instructions "1.4.0")

(require 'magit)
;; TODO is this needed if we have the PATH set correctly?
(setq magit-git-executable "/usr/local/bin/git")
(global-set-key (kbd "C-c g") 'magit-status)

(defadvice magit-status (around magit-fullscreen activate)
  (window-configuration-to-register :magit-fullscreen)
  ad-do-it
  (delete-other-windows))

(defun magit-quit-session ()
  "Restores the previous window configuration and kills the magit buffer"
  (interactive)
  (kill-buffer)
  (when (get-register :magit-fullscreen)
    (jump-to-register :magit-fullscreen)))

(define-key magit-status-mode-map (kbd "q") 'magit-quit-session)

(setq diff-switches "-u")

Ag

ag (aka the_silver_searcher) is a great command-line tool for finding things in programming source files.

(require 'ag)
(global-set-key (kbd "C-x C-g") 'ag-project) ;; Bind C-x C-g to ag-project

Dash

Dash is a Mac OS/X documentation browser and has a nice way to launch it from Emacs.

(require 'dash-at-point)
(global-set-key (kbd "C-c d") 'dash-at-point)

Neotree

Neotree is the only “project browser sidebar” thing I’ve ever been able to tolerate. It does a pretty good job if you turn off the icons and base its colors on the theme.

(setq neo-theme 'ascii)
(custom-set-faces
 '(neo-banner-face ((t . (:inherit shadow))) t)
 '(neo-header-face ((t . (:inherit shadow))) t)
 '(neo-root-dir-face ((t . (:inherit link-visited :underline nil))) t)
 '(neo-dir-link-face ((t . (:inherit dired-directory))) t)
 '(neo-file-link-face ((t . (:inherit default))) t)
 '(neo-button-face ((t . (:inherit dired-directory))) t)
 '(neo-expand-btn-face ((t . (:inherit button))) t))
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