GitHub Desktop and Atom Editor to Code Efficiently
Editing your code through the GitHub web interface is a good way to start, but it can be very slow, especially if you need to modify or upload multiple files in your repo. To speed up your work, we recommend that you download two free tools—GitHub Desktop and Atom Text Editor—which run on Mac or Windows computers. When you connect your GitHub web account to GitHub Desktop, it allows you to “pull” the most recent version of the code to your local computer’s hard drive, make and test your edits, and “push” your commits back to your GitHub web account. Atom Text Editor, which is also created by the makers of GitHub, allows you to view and edit code repos on your local computer more easily than the GitHub web interface. While there are many text editors for coders, Atom is designed to work well with GitHub Desktop.
Tip: Currently, neither GitHub Desktop nor Atom Editor are supported for Chromebooks, but Google’s Web Store offers several text editors, such as Text and Caret, which offer some of the functionality described below.)
Let’s use GitHub Desktop to pull a copy of your
leaflet-map-simple template to your local computer, make some edits in Atom Editor, and push your commits back up to GitHub.
- Go to the GitHub web repo you wish to copy to your local computer. In your browser, navigate to
https://github.com/USERNAME/leaflet-map-simple, using your GitHub username, to access the repo you created in the Fork, Edit, and Host a Simple Leaflet Map Template section of this chapter. Click the Clone or download button on the right side, and select Open in Desktop, as shown in Figure 8.18. The next screen will show a link to the GitHub Desktop web page, and you should download and install the application.
- When you open GitHub Desktop for the first time, you’ll need to connect it to the GitHub web account you previously created in this chapter. On the welcome screen, click the blue Sign in to GitHub.com button, as shown in Figure 8.19, and login with your GitHub username and password. On the next screen, GitHub will ask you to click the green Authorize desktop button to confirm that you wish to connect to your account.
- In the next setup screen, GitHub Desktop asks you to configure Git, the underlying software that runs GitHub. Confirm that it displays your username and click Continue, as shown in Figure 8.20.
- On the “Let’s Get Started” with GitHub Desktop screen, click on Your Repositories on the right side to select your
leaflet-map-sample, and further below click the blue button to Clone it to your local computer, as shown in Figure 8.21.
- When you clone a repo, GitHub Desktop asks you to select the Local Path, meaning the location where you wish to store a copy of your GitHub repo on your local computer, as shown in Figure 8.22. Before you click the Clone button, remember the path to this location, since you’ll need to find it later.
- On the next screen, GitHub Desktop may ask, “How are you planning to use this fork?” Select the default entry “To contribute to the parent project,” which means you plan to send your edits back to your GitHub web account, and click Continue, as shown in Figure 8.23.
- Now you have copies of your GitHub repo in two places—in your GitHub web account and on your local computer—as shown in Figure 8.24. Your screen may look different, depending on whether you use Windows or Mac, and the Local Path you selected to store your files.
- Before we can edit the code in your local computer, download and install the Atom Editor application. Then go to your GitHub Desktop screen, confirm that the Current Repository is
leaflet-map-simple, and click the Open in Atom button as shown in Figure 8.25.
- Since Atom Editor is integrated with GitHub Desktop, it opens up your entire repo as a “project,” where you can click files in the left window to open as new tabs to view and edit code, as shown in Figure 8.26. Open your
index.htmlfile and edit the title of your map, around line 22, then save your work.
- After saving your code edit, it’s a good habit to clean up your Atom Editor workspace. Right-click on the current Project and select Remove Project Folder in the menu, as shown in Figure 8.27. Next time you open up Atom Editor, you can right-click to Add Project Folder, and choose any GitHub repo that you have copied to your local computer.
- Now that you’ve edited the code for your map on your local computer, let’s test how it looks before uploading it to GitHub. Go to the location where you saved the repo on your local computer, and right-click the
index.htmlfile, select Open With, and choose your preferred web browser, as shown in Figure 8.28.
Note: Since your browser is displaying only the local computer version of your code, the web address will begin with
file:///... rather than
https://..., as appears in your GitHub Pages online map. Also, if your code depends on online elements, those features may not function when viewing it locally. But for this simple Leaflet map template, your updated map title should appear, allowing you to check its appearance before pushing your edits to the web.
Now let’s transfer your edits from your local computer to your GitHub web account, which you previously connected when you set up GitHub Desktop.
- Go to GitHub Desktop, confirm that your Current Repo is
leaflet-map-simple, and you will see your code edits summarized on the screen. In this two-step process, first click the blue Commit to Master button at the bottom of the page to save your edits to your local copy of your repo. (If you edit multiple files, GitHub Desktop will ask you write a summary of your edit, to help you keep track of your work.) Second, click the blue Push origin button to transfer those edits to the parent copy of your repo on your GitHub web account. Both steps are shown in Figure 8.29.
Congratulations! You’ve successfully navigated a round-trip journey of code, from your GitHub account to your local computer, and back again to GitHub. Since you previously used the GitHub Pages settings to create an online version of your code, go see if your edited map title now appears on the public web. The web address you set up earlier follows this format
https://USERNAME.github.io/REPOSITORY, substituting your GitHub username and repo name.
While you could have made the tiny code edit above in the GitHub web interface, hopefully you’ve begun to see many advantages of using GitHub Desktop and Atom Editor to edit code and push commits from your local computer. First, you can make more complex code modifications with Atom Editor, which includes search, find-and-replace, and other features to work more efficiently. Second, when you copy the repo to your local computer, you can quickly drag-and-drop multiple files and subfolders for complex visualizations, such as data, geography, and images. Third, depending on the type of code, you may be able to test how it works locally with your browser, before uploading your commits to the public web.
Tip: Atom Editor has many built-in features that recognize and help you edit code, plus the option to install more packages in the Preferences menu. One helpful built-in tool is Edit > Toggle Comments, which automatically detects the coding language and converts the selected text from executable code to non-executed code comments. Another built-in tool is Edit > Lines > Auto Indent, which automatically cleans up selected text or an entire page of code for easier reading.
GitHub also offers a powerful platform for collaborative projects, such as Hands-On Data Visualization. As co-authors, we composed the text of these book chapters and all of the sample code templates on GitHub. Jack started each day by “pulling” the most recent version of the book from our shared GitHub account to his local computer using GitHub Desktop, where he worked on sections and “pushed” his commits (aka edits) back to GitHub. At the same time, Ilya “pulled” the latest version and “pushed” his commits back to GitHub as well. Both of us see the commits that each other made, line-by-line in green and red (showing additions and deletions), by selecting the GitHub repo Code tab and clicking on one of our commits, as shown in Figure 8.30.
Although GitHub does not operate like Google Documents, which displays live edits, the platform has several advantages when working collaboratively with code. First, since GitHub tracks every commit we make, it allows us to go back and restore a very specific past version of the code if needed. Second, when GitHub repos are public, anyone can view your code and submit an “issue” to notify the owner about an idea or problem, or send a “pull request” of suggested code edits, which the owner can accept or reject. Third, GitHub allows collaborators to create different “branches” of a repo (the default is called “master”) in order to make edits, and then “merge” the branches back together if desired. Occasionally, if two or more coders attempt to push incompatible commits to the same repo, GitHub will warn about a “Merge Conflict.” To resolve this conflict and preserve everyone’s work, you may need to use the Command Line Interface (CLI) version of GitHub, which means typing commands directly into the Terminal application on Mac or Windows. Many professional coders regularly work on the Command Line with GitHub, but this requires memorizing a list of commands and is beyond the scope of this introductory book.
If this is the first time you’ve forked, edited, and hosted live code on the public web, welcome to the coding family! We hope you agree that GitHub is a powerful platform for engaging in this work and sharing with others. While beginners will appreciate the web interface, you’ll find that the GitHub Desktop and Atom Editor tools makes it much easier to work with Chart.js code templates in Chapter 9 and the Leaflet map code templates in Chapter 10. Let’s build on your brand-new coding skills to create more customized charts and maps in the next two chapters.