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architext.nvim

A structural editing plugin for neovim, powered by treesitter.

Installation

Use the only package manager :

use {
  "vigoux/architext.nvim"
  requires = {
    -- Not required, only used to refine the language resolution
    "nvim-treesitter/nvim-treesitter"
  }
}

Usage

Using the REPL

1. Open a buffer, and be sure to have the correct parsers installed for the buffers filetype.
2. :ArchitextREPL
3. Type your query, with captures for the things we want to replace / refer to
4. Type the replacements for them (empty to not replace), and refer to a capture using @{capture name}
5. Hit <CR> your edits happen !

Using :Architext

First, open a buffer, be sure to have a parser for it installed.

Then, you can use the :Architext (or :A in short) command. This is a substitue like command, with this signature :

:{range}Architext/{query}(/{capture name}:{replacement})*

Which instanciates into this, to replace every occurence of the identifier foo by bar :

:Architext/((identifier) @i (#eq? @i "foo"))/i:bar/

You can refer to captured nodes like this, lets say you want to wrap an identifier into a function:

:A/((identifier) @wrapit (#eq? @wrapit "foo"))/wrapit:func(@wrapit)/

Additional notes :

• The delimiter can be anything, and is specified by the first character after the command
• You can insert a literal @ like so @@

Query templates

You can recall query templates by starting the query argument with a $. Query templates are called like so :

$TEMPLATE:arg1:arg2:...

The : can be replaced by any non uppercase character (though, : is recommended).

If you want to omit an argument :

$TEMPLATE::arg2:...

While this might seem useful, and robust, it is actually not, and no check is done on the number of arguments you pass to a query, and wether they are expected.

Writing templates

Writing templates is easy, and follows an over-simplified snippet-like syntax, for example the builtin IDENT template looks like this :

((identifier) @id (#eq? @id "$1"))

Arguments of the template are called with ${number}, 1-based (why not ?).

Using the API

The main function une architext is architext.edit.edit, which contains all the machinery for handling replacements on (non-template) queries.

The signature is as follows:

edit(buf, parser, query, changes, start_row, end_row)

The arguments are thus:

1. The buffer number where the edits take place
2. The parser to use for that given buffer
3. The query used as reference for matching the tree (think the first part of the :Architext command)
4. The actual changes to perform, in the form of a map between capture names and their replacements (think, the rest of the :Architext command): note the there must not be the leading @ in the capture names.
5. The start row (inclusive)
6. The end row (inclusive)

As an example, here is the API to swap the first two arguments of function calls in lua:

local curbuf = vim.api.nvim_get_current_buf()
local parser = vim.treesitter.get_parser(curbuf)

local query = vim.treesitter.query.parse("lua", [[
  (arguments 
    . (_) @first
    . (_) @second)
]])

require'architext.edit'.edit(curbuf, parser, query, { first =
"@second", second = "@first" }, 0, 10)

Credits

Thanks @tjdevries for the name.