dot/config/nvim/lua/plugin_votion.lua

-- define a configuration variable votion_directory that specifies
-- the root location of the votion database all MD files in this directory
-- and it's subdirectories are part of the database.
-- Set votion_directory
local votion_directory = vim.fn.expand("~") .. "/owc"
local actions = require("telescope.actions")

function votion_new()
  -- create a new file votion_directory/yyyy-mm-ddThh-mm.md
  local current_time = os.date("%Y-%m-%dT%H-%M")
  local new_filename = string.format("%s/%s.md", votion_directory, current_time)
  vim.api.nvim_command(string.format("edit %s", new_filename))
end

function votion_open()
  require("telescope.builtin").find_files({
    search_dirs = {votion_directory},
  })
end

function votion_insert()
  require("telescope.builtin").find_files({
    search_dirs = {votion_directory},
    attach_mappings = function(_, map)
      map('i', '<CR>', function(prompt_bufnr)
        local entry = require("telescope.actions.state").get_selected_entry()
        require("telescope.actions").close(prompt_bufnr)
        vim.api.nvim_put({entry.value}, "b", true, true)
      end)
      return true
    end,
  })
end

function votion_grep()
  require("telescope.builtin").live_grep({
    search_dirs = {votion_directory}
  })
end

function votion_rename()
  local current_file = vim.api.nvim_buf_get_name(0)

  if current_file:find(votion_directory) then
    local new_name = vim.fn.input("Rename to: ")
    
    if new_name ~= "" then
      local current_file_dir = vim.fn.fnamemodify(current_file, ":h")
      new_name = string.format("%s/%s", current_file_dir, new_name)
      vim.api.nvim_command(string.format("saveas %s", new_name))
      vim.api.nvim_command(string.format("call delete('%s')", current_file))
      vim.api.nvim_command(string.format("edit %s)", current_file))

      vim.api.nvim_command("bwipeout")
    end
  else
    print("Current file is not part of the Votion database.")
  end
end

local function file_exists(file)
  local f = io.open(file, "r")
  if f ~= nil then io.close(f) return true else return false end
end

function votion_follow()
  local cursor_pos = vim.api.nvim_win_get_cursor(0)
  local current_line = vim.api.nvim_buf_get_lines(0, cursor_pos[1] - 1, cursor_pos[1], false)[1]
  local link_pattern = "%[%[(.-)%]%]"
  local link = current_line:match(link_pattern)

  if not link then
    local url_pattern = "%]%((.-)%)"
    link = current_line:match(url_pattern)
  end
  
  if link then
    local target_file = string.format("%s/%s.md", votion_directory, link)
    if file_exists(target_file) then
      vim.api.nvim_command(string.format("edit %s", target_file))
    else
      print(string.format("File '%s' does not exist. Press 'y' to create it.", link))
      local user_input = vim.fn.getchar()
      if user_input == 121 then
        local new_file = string.format("%s/%s.md", votion_directory, link)
        vim.api.nvim_command(string.format("edit %s", new_file))
      end
    end
  else
    print("No valid link under the cursor.")
  end
end

function votion_delete()
  local current_file = vim.api.nvim_buf_get_name(0)
  if current_file:find(votion_directory, 1, true) then
    local confirm_delete = vim.fn.confirm("Are you sure you want to delete this file?", "&Yes\n&No")
    
    if confirm_delete == 1 then
      local file_deleted = os.remove(current_file)
      
      if file_deleted then
        print("File deleted successfully.")
        vim.api.nvim_command("bwipeout")
      else
        print("File deletion failed.")
      end
    end
  else
    print("Current file is not part of the Votion database.")
  end
end

vim.api.nvim_command("command! VotionNew lua votion_new()")
vim.api.nvim_command("command! VotionOpen lua votion_open()")
vim.api.nvim_command("command! VotionGrep lua votion_grep()")
vim.api.nvim_command("command! VotionRename lua votion_rename()")
vim.api.nvim_command("command! VotionFollow lua votion_follow()")
vim.api.nvim_command("command! VotionDelete lua votion_delete()")
vim.api.nvim_command("command! VotionInsert lua votion_insert()")