同时编辑多行代码的最快方法

Question

What is the best way to do the same action across multiple lines of code in the RStudio source editor?

Example 1

Let's say that I copy a list from a text file and paste it into R (like the list below). Then, I want to add quotation marks around each word and add a comma to each line, so that I can make a vector.

Krista Hicks
Miriam Cummings
Ralph Lamb
Jaylene Gilbert
Jordon Sparks
Kenna Melton

Expected Output

"Krista Hicks",
"Miriam Cummings",
"Ralph Lamb",
"Jaylene Gilbert",
"Jordon Sparks",
"Kenna Melton"

Example 2

How can I add missing parentheses on multiple lines. For example, if I have an if statement, then how can I add the missing opening parentheses for names on line 1 and line 4.

if (!is.null(names pattern))) {
  vec <- FALSE
  replacement <- unname(pattern)
  pattern[] <- names pattern)
}

Expected Output

if (!is.null(names(pattern))) {
  vec <- FALSE
  replacement <- unname(pattern)
  pattern[] <- names(pattern)
}

*Note: These names are just from a random name generator.

Answer 1

RStudio has support for multiple cursors, which allows you to write and edit multiple lines at the same time.

Example 1

You can simply click Alt on Windows/Linux (or option on Mac) and drag your mouse to make your selection, or you can use Alt + Shift to create a rectangular selection from the current location of the cursor to a clicked position.

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Example 2

Another multiple cursor option is for selecting all matching instances of a term. So, you can select names and press Ctrl + Alt + Shift + M . Then, you can use the arrow keys to move the cursors to delete the space and add in the parentheses.