用emacs打造node.js开发环境

刚接触node的人对缩进会有些头痛，这个插件就帮我们搞定node的缩进

$wget http://download.savannah.gnu.org/releases-noredirect/espresso/espresso.el  $cp ./espresso.el ~/.emacs.d/

因为使用espresso的时候可能会跟yasnippet的快捷键冲突，建议大家按照下面进行修改

首先创建nodejs.el文件

$touch ~/.emacs.d/nodejs.el

把以下内容拷贝到nodejs.el里面

;;;; load & configure js2-mode   (autoload 'js2-mode "js2-mode" nil t)  (add-to-list 'auto-mode-alist '("\\.js$" . js2-mode))     ;;; espresso mode  (autoload 'espresso-mode "espresso")     (add-hook 'js2-mode-hook  (lambda ()  (yas-global-mode 1)))     (eval-after-load 'js2-mode  '(progn  (define-key js2-mode-map (kbd "TAB") (lambda()  (interactive)  (let ((yas/fallback-behavior 'return-nil))  (unless (yas/expand)  (indent-for-tab-command)  (if (looking-back "^\s*")  (back-to-indentation))))))))           (defun my-js2-indent-function ()  (interactive)  (save-restriction  (widen)  (let* ((inhibit-point-motion-hooks t)  (parse-status (save-excursion (syntax-ppss (point-at-bol))))  (offset (- (current-column) (current-indentation)))  (indentation (espresso--proper-indentation parse-status))  node)     (save-excursion     ;; I like to indent case and labels to half of the tab width  (back-to-indentation)  (if (looking-at "case\\s-")  (setq indentation (+ indentation (/ espresso-indent-level 2))))     ;; consecutive declarations in a var statement are nice if  ;; properly aligned, i.e:  ;;  ;; var foo = "bar",  ;; bar = "foo";  (setq node (js2-node-at-point))  (when (and node  (= js2-NAME (js2-node-type node))  (= js2-VAR (js2-node-type (js2-node-parent node))))  (setq indentation (+ 4 indentation))))     (indent-line-to indentation)  (when (> offset 0) (forward-char offset)))))     (defun my-indent-sexp ()  (interactive)  (save-restriction  (save-excursion  (widen)  (let* ((inhibit-point-motion-hooks t)  (parse-status (syntax-ppss (point)))  (beg (nth 1 parse-status))  (end-marker (make-marker))  (end (progn (goto-char beg) (forward-list) (point)))  (ovl (make-overlay beg end)))  (set-marker end-marker end)  (overlay-put ovl 'face 'highlight)  (goto-char beg)  (while (< (point) (marker-position end-marker))  ;; don't reindent blank lines so we don't set the "buffer  ;; modified" property for nothing  (beginning-of-line)  (unless (looking-at "\\s-*$")  (indent-according-to-mode))  (forward-line))  (run-with-timer 0.5 nil '(lambda(ovl)  (delete-overlay ovl)) ovl)))))     (defun my-js2-mode-hook ()  (require 'espresso)  (setq espresso-indent-level 2  indent-tabs-mode nil  c-basic-offset 2)  (c-toggle-auto-state 0)  (c-toggle-hungry-state 1)  (set (make-local-variable 'indent-line-function) 'my-js2-indent-function)  (define-key js2-mode-map [(meta control |)] 'cperl-lineup)  (define-key js2-mode-map [(meta control \;)]  '(lambda()  (interactive)  (insert "/* -----[ ")  (save-excursion  (insert " ]----- */"))  ))  (define-key js2-mode-map [(return)] 'newline-and-indent)  (define-key js2-mode-map [(backspace)] 'c-electric-backspace)  (define-key js2-mode-map [(control d)] 'c-electric-delete-forward)  (define-key js2-mode-map [(control meta q)] 'my-indent-sexp)  (if (featurep 'js2-highlight-vars)  (js2-highlight-vars-mode))  (message "My JS2 hook"))     (add-hook 'js2-mode-hook 'my-js2-mode-hook)    (provide 'nodejs)

然后最后修改~/.emacs 文件,增加以下内容

(require 'nodejs)