start indent module

2 files changed, 75 insertions, 0 deletions

diff --git a/lua/nvim-treesitter/configs.lua b/lua/nvim-treesitter/configs.lua
index 0842f2769..2655adc79 100644
--- a/lua/nvim-treesitter/configs.lua
+++ b/lua/nvim-treesitter/configs.lua
@@ -36,6 +36,12 @@ local builtin_modules = {
     },
     is_supported = queries.has_locals
   },
+  indent = {
+    module_path = 'nvim-treesitter.indent',
+    enable = false,
+    disable = {},
+    is_supported = queries.has_locals
+  }
 }
 
 local attached_buffers_by_module = caching.create_buffer_cache()
diff --git a/lua/nvim-treesitter/indent.lua b/lua/nvim-treesitter/indent.lua
new file mode 100644
index 000000000..bd7d64454
--- /dev/null
+++ b/lua/nvim-treesitter/indent.lua
@@ -0,0 +1,69 @@
+-- TODO: logic not working properly
+-- need to find a better way to get the indent from a line
+-- it almosts works though
+local api = vim.api
+local utils = require'nvim-treesitter.ts_utils'
+local query = require'nvim-treesitter.query'
+local parsers = require'nvim-treesitter.parsers'
+local utils = require'nvim-treesitter.ts_utils'
+local locals = require'nvim-treesitter.locals'
+
+local M = {}
+
+local function get_node_at_line(lnum)
+  local node = utils.get_node_at_cursor()
+  local srow = node:range()
+
+  if srow+1 < lnum then
+    for n in node:iter_children() do
+      local row = n:range()
+      if row+1 == lnum then
+        node = n
+        break
+      end
+    end
+  end
+
+  return node
+end
+
+function M.get_indent(lnum)
+  if not parsers.has_parser() or not lnum then return -1 end
+
+  local node = get_node_at_line(lnum)
+  local srow, scol, erow, ecol = node:range()
+
+  local parent = locals.containing_scope(node:parent() or node)
+  local parent_row, pscol, perow, pecol = parent:range()
+  local parent_indent = vim.fn.indent(parent_row+1)
+
+  if (parent_row == srow and pscol == scol) or (perow == erow and pecol == ecol) then
+    node = parent
+    srow = node:range()
+    node_indent = vim.fn.indent(srow+1)
+
+    parent = locals.containing_scope(parent:parent() or parent) 
+    parent_row = parent:range()
+    parent_indent = vim.fn.indent(parent_row+1)
+
+    if node_indent == 0 and parent_indent == 0 then
+      return 0
+    end
+  end
+
+  local tabstop = vim.bo.tabstop
+  return parent_indent + tabstop
+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