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local parsers = require'nvim-treesitter.parsers'
local queries = require'nvim-treesitter.query'
local utils = require'nvim-treesitter.ts_utils'
local M = {}
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
local wrapper = root:descendant_for_range(lnum, 0, lnum, -1)
local child = wrapper:child(0)
return child or wrapper
end
local get_indents = utils.memoize_by_buf_tick(function(bufnr)
local indents = queries.get_capture_matches(bufnr, '@indent.node', 'indents') or {}
local branches = queries.get_capture_matches(bufnr, '@branch.node', 'indents') or {}
local indents_map = {}
for _, node in ipairs(indents) do
indents_map[tostring(node)] = true
end
local branches_map = {}
for _, node in ipairs(branches) do
branches_map[tostring(node)] = true
end
return { indents = indents_map, branches = branches_map }
end)
function M.get_indent(lnum)
local parser = parsers.get_parser()
if not parser or not lnum then return -1 end
local node = get_node_at_line(parser:parse()[1]:root(), lnum-1)
local indent_queries = get_indents(vim.api.nvim_get_current_buf())
local indents = indent_queries.indents
local branches = indent_queries.branches
if not indents then return 0 end
while node and branches[tostring(node)] do
node = node:parent()
end
local ind = 0
while node do
node = node:parent()
if indents[tostring(node)] then
ind = ind + vim.bo.tabstop
end
end
return ind
end
local indent_funcs = {}
function M.attach(bufnr)
indent_funcs[bufnr] = vim.bo.indentexpr
vim.bo.indentexpr = 'nvim_treesitter#indent()'
end
function M.detach(bufnr)
vim.bo.indentexpr = indent_funcs[bufnr]
end
return M
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