编辑javascript时使用emacs进行重构

Question

Hi so I am writing a lot of server side javascript and I would like the ability to refactor while editing with emacs. Is this possible? Thanks!

By refactor I mean like how in eclipse while editing Java you can refactor one variable called for example "variableOne" into "variable1" and now all other 15 times you wrote "variableOne" becomes "variable1".

Answer 1

Probably the most sophisticated JavaScript refactoring library for Emacs is Magnar Sveen's js2-refactor . Its list of supported refactorings includes

rv is rename-var : Renames the variable on point and all occurrences in its lexical scope.

which sounds a lot like what you're looking for. It also supports a number of other very useful common rafactoring actions.

Assuming you're on Emacs 24, I recommend installing it using the MELPA repository. If you're still on Emacs 23 you'll have to upgrade or manually install package.el before you can MELPA.

Answer 2

If you are looking for just renaming variables, you might also want take a look at tern . The advantage it has compared to js2-refactor (which I use too) is that it has a concept of projects so you can rename a certain variable across multiple files in a project. It also provides other features like jump-to-definition and auto-completions (which are quite accurate).

Here are some general options for renaming a variable

1) Multiple cursors - It has a useful command mc/mark-all-like-this-dwim , which marks all the occurences of the selected text in current context you can then edit all the occurrences simultaneously.

2) Wgrep - This package enables one to apply changes done in grep buffer to respective files. This is useful when I have to replace a word across many files, in such situations use rgrep to search the word in multiple files. Then enable wgrep in the resulting grep buffer, mark the word to replaced with multiple-cursors (you can also use query-replace), make the changes and then do wgrep-save-all-buffers and all my changes are saved!

Answer 3

Your question seems to be more about renaming variables than about refactoring in general. The two places to start for information about using Emacs to rename parts of your code are these:

• Emacs Wiki Search and Replace category page. This includes search-and-replace across multiple files (eg of your project).

• The Emacs manual: use Ch r to enter the manual from Emacs.

  Then use hit the key i to look something up in the index (with completion):

  i search and replace commands takes you to the section about replacement commands.

  i search and replace in multiple files takes you to the section about Searching and Replacing with Tags Tables .

For Emacs support for projects, see the Emacs Wiki Projects category page.