viye @ d5628995c0c986c52081d41dc6875c568c275fa8

local function indent(t) return #t:match("^%s*") end

local function is_data(line) return line:find("^%s*[|:]") ~= nil end

local function is_node(line) return line:find("%S") and not is_data(line) end

local function node_text(lnum)

  local l = vim.fn.getline(lnum)

  return l:match("^%s*[+-] (.*)") or vim.trim(l)

end

local function children_of(cmd_lnum)

  local depth = indent(vim.fn.getline(cmd_lnum))

  local first, last = cmd_lnum + 1, nil

  for i = first, vim.fn.line("$") do

    local l = vim.fn.getline(i)

    if l == "" or indent(l) <= depth then break end

    last = i

  end

  return first, last

end

local function parent_of(lnum)

  local d = indent(vim.fn.getline(lnum))

  for i = lnum - 1, 1, -1 do

    local l = vim.fn.getline(i)

    if is_node(l) and indent(l) < d then return i end

  end

  return nil

end

local function ancestors(cmd_lnum)

  local parts = {}

  local lnum = cmd_lnum

  while lnum do

    table.insert(parts, 1, node_text(lnum))

    lnum = parent_of(lnum)

  end

  return parts

end

local function body_of(cmd_lnum)

  local depth = indent(vim.fn.getline(cmd_lnum))

  local first, last = children_of(cmd_lnum)

  local body = {}

  if last then

    for i = first, last do

      local l = vim.fn.getline(i)

      local val = indent(l) == depth + 2 and l:match("^%s*: (.*)")

      if val then table.insert(body, ": " .. val) end

    end

  end

  return body

end

local function run(cmd_lnum)

  local parts = ancestors(cmd_lnum)

  if #parts == 0 then return nil end

  local args = vim.tbl_map(vim.fn.shellescape, parts)

  local body = body_of(cmd_lnum)

  if #body > 0 then

    table.insert(args, "--")

    vim.list_extend(args, vim.tbl_map(vim.fn.shellescape, body))

  end

  local cmd = "viye " .. table.concat(args, " ")

  vim.notify("viye: " .. cmd, vim.log.levels.DEBUG)

  local out = vim.fn.system(cmd)

  if vim.v.shell_error ~= 0 then

    vim.notify("viye: " .. vim.trim(out or ""), vim.log.levels.ERROR)

    return nil

  end

  return out

end

local function delete_range(first, last)

  if last then vim.cmd(string.format("%d,%ddelete _", first, last)) end

end

local function insert_output(cmd_lnum, out)

  local pad = string.rep(" ", indent(vim.fn.getline(cmd_lnum)) + 2)

  local lines = vim.split(out, "\n", { trimempty = true })

  for i, l in ipairs(lines) do

    lines[i] = pad .. l

  end

  vim.fn.append(cmd_lnum, lines)

end

local function toggle_bullet(cmd_lnum, to)

  vim.fn.setline(cmd_lnum, (vim.fn.getline(cmd_lnum):gsub("^[+-] ", to .. " ", 1)))

end

local function exec()

  local lnum = vim.fn.line(".")

  local line = vim.fn.getline(lnum)

  local cmd_lnum = is_data(line) and parent_of(lnum) or lnum

  if not cmd_lnum then return end

  local first, last = children_of(cmd_lnum)

  local on_cmd = cmd_lnum == lnum

  local has_bullet = line:find("^%s*[+-] ") ~= nil

  local collapsing = last and ((on_cmd and has_bullet) or line:find("^%s*|") ~= nil)

  if collapsing then

    delete_range(first, last)

    toggle_bullet(cmd_lnum, "+")

    return

  end

  local out = run(cmd_lnum)

  if not out then return end

  delete_range(first, last)

  if out ~= "" then

    insert_output(cmd_lnum, out)

  end

  toggle_bullet(cmd_lnum, "-")

end

vim.filetype.add { extension = { viye = "viye" } }

local group = vim.api.nvim_create_augroup("viye", { clear = true })

vim.api.nvim_create_autocmd("BufEnter", {

  pattern = "*",

  group = group,

  callback = function()

    if vim.api.nvim_buf_get_name(0) == "" then

      vim.bo.filetype = "viye"

    end

  end

})

vim.api.nvim_create_autocmd("FileType", {

  pattern = "viye",

  group = group,

  callback = function()

    vim.keymap.set("n", "<CR>", exec, { buffer = true, silent = true })

  end

})