~ / text-objects / mix-and-matchlesson 6/6

Mix and match: any operator, any object

gU, y, > and Visual mode all take text objects.

?how it works

Text objects work with every operator, not just d and c: gUi" uppercases a string, yi( copies the arguments of a call and >iB indents the inside of a block.

They work in Visual mode too. Press v, then a text object, and Vim selects it: vi" selects a string's contents and va( the parentheses with everything in them. From there press any operator, or p to replace the selection with what you yanked.

In Visual mode, typing a bracket object again grows the selection outward: vi( then i( selects the inside of the next pair out.

⌨keys

`gUi"`	uppercase the inside of a string
`yi(`	yank the inside of parentheses
`>iB`	indent the inside of a {} block
`vi"`	select the inside of a string
`va(`	select parentheses and their contents
`{Visual}p`	replace the selection with the register

Nin neovim

Neovim has one more object: gc in Operator-pending mode is the block of commented lines around the cursor, so dgc deletes a whole comment block and gcgc uncomments it.

Neovim 0.12 also adds Visual-mode an and in, which select by syntax node using Treesitter (or the language server when there is no parser): an selects the parent node and in a child node, so repeating an grows the selection one meaningful chunk at a time. They need a parser, so this practice editor does not have them.

3 drills

Shout a string: Uppercase everything inside the quotes, without touching anything else.
Copy arguments into another call: Copy the arguments of the first call over the arguments of the call on the next line.
Indent the inside of a block: Indent everything between the braces by one level.

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