refactor: move template/mkdir features to user-configured autocmds

- Remove auto-mkdir autocmd from init.lua (now user-configured)
- Remove template system entirely (now user-configured)
- Rename io.lua -> utils.lua
- Inline single-use functions (handle_web_link, handle_file_link, etc.)
- Remove security warnings for external files
- Remove unused config options: use_template, template, date_fmt
- Simplify utils.resolve() without wiki root validation
- Update all documentation examples
BREAKING CHANGE: Users must now add their own autocmds for:
- Auto-creating directories on save (BufWritePre)
- Applying templates to new files (BufNewFile)
See README.md for updated configuration examples.

1 files changed, 57 insertions, 0 deletions

diff --git a/lua/muwiki/utils.lua b/lua/muwiki/utils.lua
new file mode 100644
index 0000000..af22c8e
--- /dev/null
+++ b/lua/muwiki/utils.lua
@@ -0,0 +1,57 @@
+local config = require('muwiki.config')
+local paths = require('muwiki.paths')
+
+local M = {}
+
+function M.file_exists(path)
+  local stat = vim.uv.fs_stat(path)
+  return stat and stat.type == 'file'
+end
+
+function M.dir_exists(path)
+  local stat = vim.uv.fs_stat(path)
+  return stat and stat.type == 'directory'
+end
+
+function M.open_in_buffer(filepath)
+  local bufnr = vim.fn.bufnr(filepath, true)
+  vim.api.nvim_win_set_buf(0, bufnr)
+end
+
+function M.open_index(name)
+  local wiki_path = config.wiki_path(name)
+  if not wiki_path then
+    return
+  end
+
+  local index_path = vim.fs.joinpath(wiki_path, config.options.index_file)
+  M.open_in_buffer(index_path)
+end
+
+function M.resolve(filepath, wiki_root)
+  local path = paths.strip_file_protocol(filepath)
+  return paths.resolve(path, wiki_root)
+end
+
+function M.is_text_file(ext)
+  local ext_lower = ext:lower()
+  for _, text_ext in ipairs(config.options.text_extensions) do
+    if ext_lower == text_ext then
+      return true
+    end
+  end
+  return false
+end
+
+function M.normalize_filename(text)
+  local normalized = text:lower()
+  normalized = normalized:gsub('%s+', '_')
+  normalized = normalized:gsub('[^%w_%-%.]', '')
+  return normalized
+end
+
+function M.open_wiki_file(filepath)
+  M.open_in_buffer(filepath)
+end
+
+return M