Major modes are usually set by Emacs when you open a file, but you can also set the mode explicitly by running the relevant Emacs command, for example with M-x clojure-mode or M-x major-mode. Only one major mode is active at a time. You can have multiple minor modes active at the same time. Speaking of which. Many modes are distributed as packages , which are just bundles of elisp files stored in a package repository.
Emacs 24, which you installed at the beginning of this chapter, makes it very easy to browse and install packages. M-x package-list-packages will show you almost every package available; just make sure you run M-x package-refresh-contents first so you get the latest list.
You can install packages with M-x package-install. You can also customize Emacs by loading your own elisp files or files you find on the Internet. If all you want to do is use Emacs like a text editor, you can skip this section entirely! Ha ha ha! To get started, open a new buffer in Emacs and name it jack-handy. Point is where all the magic happens: you insert text at point, and most editing commands happen in relation to point.
And even though your cursor appears to rest on top of a character, point is actually located between that character and the previous one. For example, place your cursor over the f in If you were a pirate. Point is located between I and f. Now, if you use C-k , all the text from the letter f onward will disappear.
Table of Contents
Also, try your normal OS key binding for undo; that should work as well. We create regions , and we do so by setting the mark with C-spc ctrl -spacebar. Then, when you move point, everything between mark and point is the region. For example, you could set a mark and then use C-s to search for some bit of text hundreds of lines down in your buffer. Regions also let you confine an operation to a limited area of the buffer. Try this:. This will perform the replacement within the current region rather than the entire buffer after point, which is the default behavior. In most applications we can cut text, which is only mildly violent.
We can also copy and paste. Cutting and copying add the selection to the clipboard, and pasting copies the contents of the clipboard to the current application. In Emacs, we take the homicidal approach and kill regions, adding them to the kill ring. We can then yank , inserting the most recently killed text at point.
We can also copy text to the kill ring without actually killing it. Why bother with all this morbid terminology?
- Building Emacs From Source.
- Moving the cursor:.
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Emacs stores multiple blocks of text on the kill ring, and you can cycle through them. This is cool because you can cycle through to retrieve text you killed a long time ago. Table shows some additional, useful, editing key bindings you should know about for dealing with spacing and expanding text. Emacs also has excellent built-in help.
Emacs command cheatsheet
The two key bindings shown in Table will serve you well. The help text appears in a new window , a concept I will cover later in the chapter. For now, you can close help windows by pressing C-x o q.
If you want to start digging in to Clojure code, please do skip ahead! You can always return later. The REPL is a running Clojure program that gives you a prompt and then reads your input, evaluates it, prints the result, and loops back to the prompt. If you followed the configuration instructions earlier in this chapter, you should already have it installed, but you can also install it by running M-x package-install , entering cider , and pressing enter.
Go ahead and start a REPL session now. Next, use M-x cider-jack-in. This starts the REPL and creates a new buffer where you can interact with it. After a short wait it should be less than a minute , you should see something like Figure Now we have two windows: our core. In the meantime, try evaluating some code in the REPL.
Type in the following bolded lines. The result that you should see printed in the REPL when you press enter is shown after each line of code. Pretty nifty! You can use this REPL just as you used lein repl in the first chapter. What you would normally refer to as a window , Emacs calls a frame , and the frame can be split into multiple windows. Splitting into multiple windows allows you to view more than one buffer at a time. You already saw this happen when you ran cider-jack-in see Figure I encourage you to try the Emacs window key bindings. For example, put your cursor in the left window, the one with the Clojure file, and use C-x 1.
The other window should disappear, and you should see only the Clojure code. Then do the following:. These commands will let you evaluate, tweak, compile, and run code with just a few dainty keystrokes. Now use C-e to navigate to the end of the line, and then use C-x C-e. The key binding C-x C-e runs the command cider-eval-last-expression. As the name suggests, this command sends the expression immediately preceding point to the REPL, which then evaluates the expression. You can also try C-u C-x C-e , which prints the result of the evaluation after point. In the core. This key binding sets the namespace to the namespace listed at the top of your current file, so the prompt in the right window should now read clojure-noob.
Next, enter -main at the prompt. How exciting! At the bottom of core. You have to compile your code for the REPL to be aware of your changes. CIDER should close the parenthesis and evaluate the expression. Pressing C-c C-d C-d will display documentation for the symbol under point, which can be a huge time-saver.
The key binding M-. Finally, C-c C-d C-a lets you search for arbitrary text across function names and documentation. At the prompt, type map and press enter. You should see something like Figure As you can see, calling map with no arguments causes Clojure to lose its mind—it shows an ArityException error message in your REPL buffer and fills your left window with text that looks like the ravings of a madman. These ravings are the stack trace , which shows the function that actually threw the exception, along with which function called that function, down the stack of function calls. CIDER gives you a hand by allowing you to filter stack traces, which reduces noise so you can zero in on the cause of your exception.
You can click each option to activate that filter.
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You can also click each stack trace line to jump to the corresponding source code. You can also get error messages when trying to compile files. To see this, go to the core. Again, press q to close the stack trace. While writing code in the Clojure buffer, you may have noticed some unexpected things happening. For example, every time you type a left parenthesis, a right parenthesis immediately gets inserted.
Paredit ensures that all parentheses, double quotes, and brackets are closed, relieving you of that odious burden. Paredit also offers key bindings to easily navigate and alter the structure created by all those parentheses. Wrapping surrounds the expression after point with parentheses. Slurping moves a closing parenthesis to include the next expression to the right.
For example, say we start with this:. We can wrap the 2 , add an asterisk, and then slurp the 3. First, place point, which is represented here as a vertical pipe, :. Then type M- , the binding for paredit-wrap-round , getting this result:. This makes it easy to add and extend parentheses without wasting precious moments holding down arrow keys to move point.
Emacs Stack Exchange is a question and answer site for those using, extending or developing Emacs. It only takes a minute to sign up. According to the cheat sheet of Emacs, M-w to copy a highlighted text and C-y to paste it.
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M-w means command w which ultimately tries to kill the terminal? Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How to copy paste in OSX terminal in emacs? Ask Question.
Emacs Cheat Sheet for macOS · GitHub
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