docs: keep readme focused on setup

[dotfiles.git] / .config / nvim / lua / plugin-config / nvim-treesitter.lua

diff --git a/.config/nvim/lua/plugin-config/nvim-treesitter.lua b/.config/nvim/lua/plugin-config/nvim-treesitter.lua
index ab75996..bbe2824 100644 (file)
--- a/.config/nvim/lua/plugin-config/nvim-treesitter.lua
+++ b/.config/nvim/lua/plugin-config/nvim-treesitter.lua
@@ -1,22 +1,58 @@
-require'nvim-treesitter'.setup {
-  -- A list of parser names, or "all"
-  ensure_installed = { "c", "lua", "vim", "vimdoc", "query" },
-
-  -- Automatically install missing parsers when entering buffer
-  -- Recommendation: set to false if you don't have `tree-sitter` CLI installed locally
-  auto_install = true,
-
-  highlight = {
-    enable = true,
-
-    -- to disable slow treesitter highlight for large files
-    disable = function(lang, buf)
-        local max_filesize = 100 * 1024 -- 100 KB
-        local ok, stats = pcall(vim.uv.fs_stat, vim.api.nvim_buf_get_name(buf))
-        if ok and stats and stats.size > max_filesize then
-            return true
-        end
-    end,
-    additional_vim_regex_highlighting = false,
-  },
+local treesitter = require('nvim-treesitter')
+
+treesitter.setup {
+  install_dir = vim.fn.stdpath('data') .. '/site',
+}
+
+treesitter.install {
+  'bash',
+  'c',
+  'cmake',
+  'cpp',
+  'json',
+  'lua',
+  'markdown',
+  'markdown_inline',
+  'python',
+  'query',
+  'toml',
+  'vim',
+  'vimdoc',
+  'yaml',

 }
 }

+
+local function foldlevel(lnum, exclude_start)
+  if lnum < 1 or lnum > vim.api.nvim_buf_line_count(0) then
+    return 0
+  end
+  local value = vim.treesitter.foldexpr(lnum)
+  local level = tonumber(value:match('%d+')) or 0
+  -- A '>N' starts a new fold even when adjacent folds have the same level.
+  return math.max(0, level - (exclude_start and value:sub(1, 1) == '>' and 1 or 0))
+end
+
+function _G.DotfilesFoldExpr()
+  local line = vim.v.lnum
+  -- Keep only levels spanning the previous, current, and next lines.
+  -- Default foldminlines keeps interiors of fewer than two lines visible.
+  return math.min(foldlevel(line - 1), foldlevel(line, true), foldlevel(line + 1, true))
+end
+
+local function enable(buf)
+  vim.wo[0][0].foldexpr = '0'
+  if not pcall(vim.treesitter.start, buf) then
+    return
+  end
+
+  vim.wo[0][0].foldexpr = 'v:lua.DotfilesFoldExpr()'
+  vim.wo[0][0].foldmethod = 'expr'
+end
+
+vim.api.nvim_create_autocmd('FileType', {
+  callback = function(args) enable(args.buf) end,
+})
+
+-- Startup filetype detection can precede this config being sourced.
+if vim.bo.filetype ~= '' then
+  enable(0)
+end