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https://github.com/zdcthomas/yop.nvim

make you some user operators for great good
https://github.com/zdcthomas/yop.nvim

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make you some user operators for great good

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# YOP (Your OPerator)



> **Warning**

> This plugin is currently in ALPHA and bindings very well might change!

> I'll try to indicate breaking changes in the [breakin change issue](https://github.com/zdcthomas/yop.nvim/issues/1)



## Installation



Here are some snippets for your plugin manager of choice. These implement only

the [sorting](#Sortin) operator.



Lazy.nvim:

```lua

{"zdcthomas/yop.nvim"}

```



Packer:

```lua

use("zdcthomas/yop.nvim")

```



Vim-Plug:

```VimL

Plug 'zdcthomas/yop.nvim'

```



## What is this?



This is a plugin that allows you to easily make you some operators for great good!



> Wait what's an Operator?



That's a good question! There's not much talk about operators in the plugin

community, but you've almost certainly been using them already. An operator is

any key that _operates_ over a selection of text, selected either through a

motion (ex: `iw`: in-a-word, `ab`: around-a-bracket, etc), or through a visual

selection.



Some of the most common built in operators are 

- `d`: delete

- `y`: yank

- `c`: cut

- `!`: run selection through an external program

- `gq`: format selection



There're tons of less widely known operators too, and they're definitely worth

checking out! Run [:h operator][operator-help] to learn more.



> Ok but what does _this_ plugin do?



Normally, defining an operator takes a bit of work, you'll have to get the text

covered by motion or visual selection, _*operate*_ on that text, and then

replace the text in the buffer. This plugin handles everything for you except

the operation, so you can focus on what you really care about.



With YOP, all you need is a function that transforms and returns the selected

lines, or does some other super cool thing.



> Alright, I'm sold! How do I make my own operator?



### Making your own operators



The primary interface for `yop.nvim` is the `op_map` function.

```lua

require("yop").op_map

```



This function takes the same arguments as [vim.keymap.set][keymap.set], except

that the 3rd argument (normally either a function or a string representing a

vim command), now has to be a function that looks like:

```lua

function (selections, info)

  ...

  return optional_replacement_lines

end

```

where:

- selections: A list with the selected lines or parts of lines.

- info: a table with extra info about the motion. (Most of the time you won't

  need this and can just pass in a 1-arity function)

  ```lua

  {

    position = {

      first = {row_number, column_number},

      last = {row_number, column_number},

    },

    type = motion_callback_type

  }

  ```

  Row_number and column_number are 1-indexed integers, motion_callback_type is one of `line`|`char`|`block`



- optional_replacement_lines: The function can optionally return a table of lines, which will replace the

selected region in the buffer.



> **Note**

> Remember, in Lua, you can ignore extra arguments by simply not listing them

> in the declaration. This means that you can pass in a 0-arity, 1-arity, or 2-arity

> function and all will work!



For some example transformation functions, see [the examples section](#Examples)



### Putting it all together



A full (but useless) example might look like:

```lua

require("yop").op_map({"n", "v"}, "b", function(lines, info)

  return { "bread" }

end)

```

This example simply replaces the entire selected area with the text `bread`.

On a buffer that looks like

```

1 2 3

4 5 6

7 8 9

```



With your cursor on `4` type in `bw`. Now `{ "4 5"}` will be passed in

as the first argument to the function you passed in. We could also type

`vwb`, and since we told `op_map` that we'd also like this mapping to

exist in visual mode, it will behave identically.



Afterward, the buffer will look like:

```

1 2 3

bread 6

7 8 9

```



If instead, you type `bk`, then lines will be `{"1 2 3", "4 5 6"}`

because `k` is a line wise motion. This is the same as if you entered visual

line mode with `V` and selected the top two lines before hitting `b`.

The buffer will then become

```

bread

7 8 9

```



> **Warning**

> The following api is very likely to change.



A version of the same function that operates on the whole line can also 

be created by including`linewise = true` in the third argument opts. This 

has to be a differentmapping, since this includes a motion along with the

operator. It also must be in normal mode



For example:

```lua

require("yop").op_map("n", "bb", function(lines, info)

  return { "bread" }

end, {linewise = true})

```



This allows you to run `bb` on the first line in this example

buffer, and change it to:

```

bread

4 5 6

7 8 9

```



## Examples



Here's a cool little example of a sorting operator, inspired heavily by the

[sort motion plugin][sort-motion], but with the added feature of asking the

user for a delimiter to split the line on.



### Sortin!

```lua

function(lines, opts)

  -- We don't care about anything non alphanumeric here

  local sort_without_leading_space = function(a, b)

    -- true = a then b

    -- false = b then a

    local pattern = [[^%W*]]

    return string.gsub(a, pattern, "") < string.gsub(b, pattern, "")

  end

  if #lines == 1 then

    -- If only looking at 1 line, sort that line split by some char gotten from input

    local delimeter = utils.get_input("Delimeter: ")

    local split = vim.split(lines[1], delimeter, { trimempty = true })

    -- Remember! `table.sort` mutates the table itself

    table.sort(split, sort_without_leading_space)

    return { utils.join(split, delimeter) }

  else

    -- If there are many lines, sort the lines themselves

    table.sort(lines, sort_without_leading_space)

    return lines

  end

end

```



### Searchin!



> **Note**

> This requires [Telescope][telescope] to be installed



Here's a real small little guy that'll search in [telescope][telescope] for the text passed

over in a motion, or selected visually.



```lua

function(lines)

  -- Multiple lines can't be searched for

  if #lines > 1 then

    return

  end

  require("telescope.builtin").grep_string({ search = lines[1] })

end

```



## Contributing! (Thank you!)



Please feel free to contribute!



### Testing



This uses [busted][busted], [luassert][luassert] (both through

[plenary.nvim][plenary]) and [matcher_combinators][matcher_combinators] to

define tests in `test/spec/` directory.



To run all tests just execute



```bash

$ make test

```



### GitHub actions



On each PR and on Main, a GitHub Action will run all the tests, and the linter.

Tests will be run using [stable and nightly][neovim-test-versions] versions of

Neovim.



### What's in a name

> It's a great plugin, but I really hate that name! Yop!? I mean, come on! How do you even pronounce it?



Well, first off, it's YAWP, and second, here's a list of other names that were considered that you hopefully hate

a bit more!



- PSYOP

- MYOPIC

- MYOP

- YOUROP

- OPPENHEIMER

- YOPTIMUS PRIME

- OPTIMUS PRIME

- YOPOLOPOLIS

- POP



[lua]: https://www.lua.org/

[entr]: https://eradman.com/entrproject/

[luarocks]: https://luarocks.org/

[busted]: https://olivinelabs.com/busted/

[luassert]: https://github.com/Olivine-Labs/luassert

[plenary]: https://github.com/nvim-lua/plenary.nvim

[matcher_combinators]: https://github.com/m00qek/matcher_combinators.lua

[integration-badge]: https://github.com/zdcthomas/yop.nvim/actions/workflows/integration.yml/badge.svg

[integration-runs]: https://github.com/zdcthomas/yop.nvim/actions/workflows/integration.yml

[neovim-test-versions]: .github/workflows/integration.yml#L17

[help]: doc/my-awesome-plugin.txt

[sort-motion]: https://github.com/christoomey/vim-sort-motion

[operator-help]: https://neovim.io/doc/user/motion.html#operator

[telescope]: https://github.com/nvim-telescope/telescope.nvim

[keymap.set]: https://neovim.io/doc/user/lua.html#vim.keymap.set()