- Start a terminal
- Make sure Java is installed
- Get Leiningen installed
- Get Light Table installed
- Get Heroku installed (includes Git)
- Test installation
For these instructions, and for much of the class, you will need to have a terminal, or command line, open. This is a text-based interface to talk to your computer, and you can open it by clicking "Dash Home" and typing Terminal. You can also open a terminal at any time by pressing CTRL-ALT-T. If you have never used the terminal before, you may want to spend some time reading up on command-line basics.
Go ahead and open your terminal now. It should look something like this:
The prompt (where you will type your commands) may look different: it usually shows the computer name and user name, as well as the folder or directory you are currently in.
For the rest of this setup, I will tell you to run commands in your terminal. When I say that, I mean "type the command into the terminal and press the Return key."
Run java -version in your terminal. If you do not have Java installed, Ubuntu will prompt you to install it. It should look something like this:
Follow all of the directions Ubuntu gives you, selecting the package "openjdk-7-jre-headless" then return to this part of the tutorial and run java -version again.
If Java is installed, you will see something like this in your terminal:
The details of Java's version may differ from what you see above; that is perfectly fine.
Leiningen is a tool used on the command line to manage Clojure projects.
Go to the Leiningen website. You will see a link to the lein script under the "Install" heading. Right-click that link and choose "Save Link As...". Save it in your Downloads directory.
After that, run the following commands in your terminal. You will be prompted to enter your password.
sudo mkdir -p /usr/local/bin/
sudo mv ~/Downloads/lein* /usr/local/bin/lein
sudo chmod a+x /usr/local/bin/lein
export PATH=$PATH:/usr/local/bin
After you run the above commands, run the lein version command. It should take a while to run, as it will download some resources it needs the first time. If it completes successfully, you are golden! If not, ask an instructor for help.
You will need to know whether you are running the 32-bit or 64-bit version of Ubuntu. To find out, click Dash Home and type Details. You should see a window like this:
Alternatively, open your terminal and type uname -m if the output says "x86_64" you have a 64-bit OS, if it says "i686" you have a 32-bit OS.
Go to the Light Table site. On the page there, you should see a set of buttons that have download links for Light Table. Depending on your architecture, click the "Linux64" or "Linux32" button and select the "Save file".
Open up your terminal and cd to the directory where your downloads go cd ~/Downloads.
Check to see that your file is there. ls
Extract the compressed file tar -xzf LightTableLinux64.tar.gz
Check to see that there is now a directory called LightTable ls
Move the LightTable directory to "/usr/local/bin" sudo mv LightTable /usr/local/bin
Set your path so you can launch LightTable from the command line export PATH=$PATH:/usr/local/bin/
Launch LightTable LightTable
If you want, you can create a launcher for LightTable. sudo gnome-desktop-item-edit /usr/share/applications/ --create-new
You should see a window like this:
Name the launcher LightTable. Type the path to the command /usr/local/bin/LightTable/LightTable. Click the icon. The LightTable icon can be found at /usr/local/bin/LightTable/core/img/lticon.png.
Heroku is the tool we will use in order to put your application online where others can see it.
First, we need to create an account. Go to Heroku and click the "Sign up" link.
You will be taken to a form where you need to enter your email address in order to sign up. Fill out that form, and you will be sent an email with a link to click to continue the signup process.
After clicking on the link, you will be taken to another form where you will need to choose a password. Choose one and enter it twice.
After all that, you should be at your Heroku dashboard. There will be a link on the dashboard to download the Heroku Toolbelt. Download it now.
If you do not see this link on your dashboard, you can download the toolbelt from toolbelt.heroku.com.
This will take you too a page with a terminal command. Copy this command and paste it into your terminal. Once the Heroku Toolbelt is installed, run the command heroku login. You will be prompted for your email and password on Heroku. If you are prompted to create an SSH key, say yes. If you enter them and the command ends successfully, congratulations!
If you've used Git before then you should already have user.name and user.email configured. Otherwise, type this in the terminal:
git config --global user.name "Your Actual Name"
git config --global user.email "Your Actual Email"
TIP: Use the same email address for heroku, git, github, and ssh.
Verify by typing this in the terminal:
git config --get user.name
Expected result:
your name
git config --get user.email
Expected result:
your email address
You have set up Java, Leiningen, Light Table, Git, and Heroku on your computer--all the tools you will need for this course. Before starting, we need to test them out.
Go to your terminal and run the following command:
git clone https://github.com/heroku/clojure-sample.git
This will check out a sample Clojure application from GitHub, a central repository for lots of source code. Your terminal should look similar to this picture:
Then run the command:
cd clojure-sample
This will put you in the directory with the source code for this sample bit of Clojure code. After that completes, run:
lein repl
This could take a long time, and will download many other pieces of code it relies on. You should see lines that start with Retrieving ... on your screen. When it finishes, your terminal should look like the following:
This is starting a REPL, which we will learn about soon. It's a special terminal for Clojure. At the REPL prompt, type (+ 1 1) and press Return. Did you get the answer 2 back? You will learn more about that in the course. For now, press the Control button and D button on your keyboard together (abbreviated as Ctrl+D). This should take you out of the Clojure REPL and back to your normal terminal prompt.
Now, start Light Table. Once it is started, press the Control button and Space Bar together (abbreviated Ctrl+Space). This is how you start giving Light Table a command. Start typing the word "instarepl" and you should see a menu of options, like below. Choose "Instarepl: open a clojure instarepl."
At the bottom of the screen, you will see a cube moving and some text about connecting and installing dependencies. Once that stops moving, type (+ 1 1) into the window. It should look like the following image:
If that worked, great! Close Light Table. We only have one more thing to test, Heroku.
Go back to your terminal. You should still be in the clojure-sample directory.
Run this command:
heroku create
There should be output about something being created. A URL will be displayed. Look at the following example:
Next, run the following commands:
git push heroku master
heroku open
Enter "yes" if you are asked if you are sure you want to connect, like in the following image:
Your browser should open (and take a long time to load), and you should see a website like the following:
If your browser does not open after running heroku open, start a browser and go to the URL displayed after you ran heroku create.
Congratulations! That website is running code you have on your computer that you have uploaded. You have actually made a very simple Clojure app, and your computer is all set up to make more.