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local parsers = require'nvim-treesitter.parsers'
local queries = require'nvim-treesitter.query'
local tsutils = require'nvim-treesitter.ts_utils'
local M = {}
-- TODO(kiyan): move this in tsutils and document it
local function get_node_at_line(root, lnum)
for node in root:iter_children() do
local srow, _, erow = node:range()
if srow == lnum then return node end
if node:child_count() > 0 and srow < lnum and lnum <= erow then
return get_node_at_line(node, lnum)
end
end
end
local function node_fmt(node)
if not node then return nil end
return tostring(node)
end
local get_indents = tsutils.memoize_by_buf_tick(function(bufnr, root, lang)
local get_map = function(capture)
local matches = queries.get_capture_matches(bufnr, capture, 'indents', root, lang) or {}
local map = {}
for _, node in ipairs(matches) do
map[tostring(node)] = true
end
return map
end
return {
indents = get_map('@indent.node'),
branches = get_map('@branch.node'),
returns = get_map('@return.node'),
ignores = get_map('@ignore.node'),
}
end, {
-- Memoize by bufnr and lang together.
key = function(bufnr, _, lang)
return tostring(bufnr) .. '_' .. lang
end
})
function M.get_indent(lnum)
local parser = parsers.get_parser()
if not parser or not lnum then return -1 end
local root, _, lang_tree = tsutils.get_root_for_position(lnum, 0, parser)
-- Not likely, but just in case...
if not root then return 0 end
local q = get_indents(vim.api.nvim_get_current_buf(), root, lang_tree:lang())
local node = get_node_at_line(root, lnum-1)
local indent = 0
local indent_size = vim.fn.shiftwidth()
-- to get corret indetation when we land on an empty line (for instance by typing `o`), we try
-- to use indentation of previous nonblank line, this solves the issue also for languages that
-- do not use @branch after blocks (e.g. Python)
if not node then
local prevnonblank = vim.fn.prevnonblank(lnum)
if prevnonblank ~= lnum then
local prev_node = get_node_at_line(root, prevnonblank-1)
-- we take that node only if ends before lnum, or else we would get incorrect indent
-- on <cr> in positions like e.g. `{|}` in C (| denotes cursor position)
local use_prev = prev_node and (prev_node:end_() < lnum-1)
-- nodes can be marked @return to prevent using them
use_prev = use_prev and not q.returns[node_fmt(prev_node)]
if use_prev then
node = prev_node
end
end
end
-- if the prevnonblank fails (prev_node wraps our line) we need to fall back to taking
-- the first child of the node that wraps the current line, or the wrapper itself
if not node then
local wrapper = root:descendant_for_range(lnum-1, 0, lnum-1, -1)
node = wrapper:child(0) or wrapper
if q.indents[node_fmt(wrapper)] ~= nil and wrapper ~= root then
indent = indent_size
end
end
while node and q.branches[node_fmt(node)] do
node = node:parent()
end
local first = true
local prev_row = node:start()
while node do
-- do not indent if we are inside an @ignore block
if q.ignores[node_fmt(node)] and node:start() < lnum-1 and node:end_() > lnum-1 then
return -1
end
-- do not indent the starting node, do not add multiple indent levels on single line
local row = node:start()
if not first and q.indents[node_fmt(node)] and prev_row ~= row then
indent = indent + indent_size
prev_row = row
end
node = node:parent()
first = false
end
return indent
end
local indent_funcs = {}
function M.attach(bufnr)
indent_funcs[bufnr] = vim.bo.indentexpr
vim.bo.indentexpr = 'nvim_treesitter#indent()'
vim.api.nvim_command("au Filetype "..vim.bo.filetype.." setlocal indentexpr=nvim_treesitter#indent()")
end
function M.detach(bufnr)
vim.bo.indentexpr = indent_funcs[bufnr]
end
return M
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