Dev: Tricks

PaulLawrenceHayes edited this page Jun 23, 2017 · 3 revisions

Note: this is a page of useful tricks for developers.

Quick links:


Remove Untracked Files

There are a lot of files that are in our .gitignore file that stack up and don't gt cleaned. In order to remove every untracked file, including hidden ones, do this:

git clean -d -x -f

Warning: this will kill everything that's not currently being tracked. You probably want to run git status first.

Git completion

  • This changes the prompt on the command line to show the current branch. Install by copying it to /, follow install instructions. For a cleaner prompt, replace the PS1 suggested with: PS1='\w$(__git_ps1 " (%s)")> ' The prompt will look like: ~/stan (master)> where "/stan" is the current directory, "(master)" indicates the current branch is the master branch.

  • git-completion.*sh. Install this for auto-completion from the command line. It auto-completes git commands and git branches. For example, type git checkout then hit tab twice. It should show the available branches.


Aquamacs: single kill buffer

By default, aquamacs will has multiple kill buffers. This means that there is a copy and paste buffer by using command-c/x/v and there is a separate copy and paste buffer by using ctrl-w, alt-w, ctrl-y. This gets really confusing. Here's how to have a single kill buffer so copying from any Mac program will paste into emacs using ctrl-y or command-v.

  1. Open ~/.emacs (or wherever else you're storing your preferences)
  2. Add: (setq x-select-enable-clipboard t)

Fixing Line Feeds and Tabs

Ant includes a handy task called FixCRLF that "Adjusts a text file to local conventions." So you can set it to replace tabs with spaces and Windows line ends with unix ones.


Auto-removing tabs

To make sure you never have tabs in your code files, you can use this in your .emacs file:

(defun java-mode-untabify ()
     (goto-char (point-min))
     (if (search-forward "\t" nil t)
         (untabify (1- (point)) (point-max))))

 (add-hook 'java-mode-hook
           '(lambda ()
              (make-local-variable 'write-contents-hooks)
              (add-hook 'write-contents-hooks 'java-mode-untabify)))

 (add-hook 'html-mode-hook
           '(lambda ()
              (make-local-variable 'write-contents-hooks)
              (add-hook 'write-contents-hooks 'java-mode-untabify)))

 (add-hook 'cpp-mode-hook
           '(lambda ()
              (make-local-variable 'write-contents-hooks)
              (add-hook 'write-contents-hooks 'java-mode-untabify)))

 (add-hook 'stan-mode-hook
           '(lambda ()
              (make-local-variable 'write-contents-hooks)
              (add-hook 'write-contents-hooks 'java-mode-untabify)))

You can rename --- the "Java" in the title is a holdover from where I first got the macros.

You can also automatically remove line-final whitespace (this is just for C++, but it could be hooked elsewhere):

(add-hook 'c++-mode-hook
          (lambda () (add-to-list 'write-file-functions 'delete-trailing-whitespace)))

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