Jumping between matching pairs of characters in Vim and Emacs

It is very useful to jump through corresponding pairs of characters, such as parentheses or tags, when coding or writing in a markup language such as HTML, Markdown or LaTeX.

Both Vim and Emacs have dedicated commands for this purpose.

To jump between matching pairs using Vim

Vim uses a “single character” command to jump to the nearest pairs of corresponding characters and to place the cursor into the closing one: %.

For instance: let’s assume that the cursor is placed at the beginning of the following sentence:

If you want to write your own use the contents of [syntax-ppss (point)]

When you press % your cursor jumps to the corresponding closing square bracket.

If you press % another time the cursor jumps back to the opening corresponding square bracket.

If you place the cursor everywhere inside the square brackets and press % it jumps to the closing round bracket.

Naturally, if you press another time the % command the cursor jumps to the opening corresponding round bracket.

The same behavior applies for environment tags in some markup languages, such the quote one in LaTeX with VimTeX plugin (about the “quote” environment in LaTeX you can read this article of mine):

\begin{quote}
Some text inside `quote` environment.
\end{quote}

If you randomly place the cursor inside the \begin{quote} tag and press % the cursor jumps to the last character of the \end{quote} tag (i.e. the closing corresponding one).

If you press another time the % or press it randomly inside the \end{quote} tag, the cursor jumps on the first character of the \begin{quote} tag.

Therefore, Vim, uses a single character for various corresponding pairs.

To jump between matching pairs using GNU/Emacs

GNU/Emacs uses a slighly different solution,

Let’s assume that you’ve the cursor pointed in the beginning of the same previous sentence:

If you want to write your own use the contents of [syntax-ppss (point)]

With the cursor on the opening square bracket, you have to press C-M-f (which corresponds to the forward-sexp function) to jump to the closing corresponding square bracket.

If you, now, press C-M-b (which corresponds to the function backward-sexp) the cursor jumps back the corresponding opening square bracket.

The same happens with round brackets and other pairing characters.

You have, however, place the cursor just above the corresponding opening or closing character.

So: the standard keyboard shortcuts for jumping through corresponding pairs in Emacs are: C-M-f forward and C-M-b backward.

But if you use AUCTeX, a Sophisticated document creation for LaTeX documents, and you need to move between corresponding environment tags, you need to know two other shortcuts.

The following sentence is from pag. 32 of the actual AUCTeX.pdf handbook:

AUCTEX offers keyboard shortcuts for moving point to the beginning and to the end of the current environment.

At page n. 28 you’ll find the shortcuts:

[Command] LaTeX-find-matching-begin (C-M-a) Move point to the ‘\begin’ of the current environment.

[Command] LaTeX-find-matching-end (C-M-e) Move point to the ‘\end’ of the current environment.

But pay attention: you must place the cursor inside the environment tags to make the AucTeX shortcuts work. If the cursor is out of the tags or even on the backslash of the opening tag, the command C-M-e will give an unexpected result.

Thus, in AucTeX you can use the standard shortcuts for parentheses and other coupling characters and other shortcuts for additional environments.

Summary for Vim and Emacs

We can report, therefore, a brief summary:

  • Vim uses, normally, only one command for every opening or closing pairing elements or tags.
  • GNU/Emacs uses two different standard shortcuts for opening and closing corresponding characters, as well as other shortcuts depending on the working environment.

Than you for your attention.

Originally published at https://francopasut.netlify.app

Comments

Post a Comment

Popular posts from this blog

Vim: searching for text containing a slash or a question mark

Vim: searching for text containing a slash or a question mark Vim: the search command To activate a text search in Vim, press one of the following trigger keys in your keyboard: the slash "/" key (do not confuse with the back-slash "\" key) the question mark key. By pressing the slash "/" key will activate a forward search. By pressing the question mark "/" key will activate a backward search. To move the cursor to the results in your document, press the "n" key (mnemonic for “ next ”). To invert the direction of the cursor, press the "N" key, (“upper n”) . What about if you need to search for a slash or a question mark , i.e. the same trigger characters , in your document? You can prepend the Escape character to the trigger key. The Escape character The Escape character is the back-slash key: "\" . Just an example: if you need to forward search (then with / trigger k...
Read more

Vim: Cut, Copy and Paste to and from the system clipboard

Image
Vim: Cut, Copy and Paste to and from the system clipboard Table of Contents 1. Cut, Copy and Paste using the computer keyboard 2. Vim and the clipboard 3. From Vim to the Clipboard 4. From the Clipboard to Vim 5. Some key shortcuts in gVim Figure 1: Vim 1 Cut, Copy and Paste using the computer keyboard Everybody knows how to use the keyboard combinations Ctrl-c , Ctrl-x , and Ctrl-v in Windows and Linux (or Cmd-c , Cmd-x and Cmd-v in macOS) to copy, cut and paste text across applications. Many think that those combinations are universal and work with any application. But Vim and gVim are different, they use another system to exchange information with the rest of the IT world. For example, in Vim under Linux, the key combination Ctrl-v corresponds to the visual block function and does not affect the pasting text. I wrote this article to remind me, as a non-programmer, the key combinations to be used in the Vim world to sha...
Read more