Automatic ctags with RubyMotion and Vim12 Feb 2013
$ rake ctags
Make Ctags Better With Automation
Ctags make writing code more efficient. But we shouldn’t have to type
$ rake ctags every time we create a new RubyMotion project. This article shows how to use a shell script to generate ctags automatically every time you create a new RubyMotion app.
How Ctags Save Time
Ctags can save you time. For example, when creating a new class called
HomeViewController that inherits from
UIViewController, typing the first view characters of the superclass will produce the drop-down shown below.
RubyMotion’s implementation of ctags includes support for built-in iOS classes like UIViewController. The code completion and drop-downs offered by ctags will reduce keystrokes and errors, freeing the developer to focus on solving harder problems.
Creating the Script
Here’s the script. You can use any name that suits you. My script is called
mmotion.command (with two m’s at the beginning to distinguish it from the standard
motion command) and it’s in the
# Create a RubyMotion app, change into the app's directory, and run ctags.
# Written by Raymond T. Hightower on February 12, 2013
echo "Creating a new RubyMotion app called:" $1
motion create $1
echo "Creating ctags for the new RubyMotion app..."
echo "Opening the new app in Vim..."
echo "To use the RubyMotion console, cd into the new directory:" $1
All of the work is done by by four lines. The remaining lines are comments or ‘echos’ that tell the user what’s happening while the script is running.
Running the Script
~/bin/ is in the
$PATH, you can run the script with the following line command:
$ mmotion.command [app name]
Of course, we can still do better by leveraging the power of aliases in
Adding an Alias to ~/.bash_profile
Dropping an alias into
~/.bash_profile streamlines the process even more. You can use any alias you want as long as it doesn’t confilct with another command. Here’s what my alias looks like:
Taking the Script for a Spin
Now we can build a new RubyMotion app called
NewApp with these results:
~/Code/Ruby/RubyMotion$ mmotion NewApp
Creating a new RubyMotion app called: NewApp
Creating ctags for the new RubyMotion app...
Opening the new app in Vim...
To use the RubyMotion console, cd into the new directory: NewApp
After the bash script ends, it lands in the directory from which it was originally run, no matter what directories it changed to during execution. This script will open the new app in Vim when it’s done.
From here, you can
$ cd NewApp and type
rake to run the app in the iOS simulator.
If you notice any glitches with this approach, feel free to send me a “heads up” via the contact form on this site or in the blog comments below.