fix(mappings): add global entry-point keymaps and correct <Leader>ww/<Leader>wt targets

Two bugs prevented keymaps from working after a Dein install:

1. <Leader>ww and <Leader>wt both called diary_today() instead of
   wiki_index() / wiki_tab_index(). Fixed in keymaps.lua (Neovim)
   and ftplugin/vimwiki.vim (Vim).

2. All keymaps were buffer-local (<buffer> / buffer=bufnr), so they
   only activated inside an already-open .wiki file. Users had no way
   to reach the wiki from any other buffer, making the plugin appear
   broken on a fresh Vim start.

   Fix: register the eight <Leader>w* entry-point mappings globally —
   in setup() for Neovim (lua/nuwiki/init.lua) and in plugin/nuwiki.vim
   for plain Vim. To avoid a chicken-and-egg LSP dependency, the global
   mappings open files directly from config (wiki_root, diary_rel_path,
   file_extension); the LSP auto-starts via the FileType autocmd once
   the vimwiki buffer loads. Three new autoload helpers
   (open_wiki_path, open_diary_path, open_diary_index_path) provide the
   LSP-free path for the Vim side.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lua/nuwiki/init.lua

@@ -13,6 +13,58 @@ local M = {}
 local config = require('nuwiki.config')
 local lsp = require('nuwiki.lsp')
 
+-- Open a file directly, expanding ~ / env vars in the path.
+local function _open(path, open_cmd)
+  vim.cmd((open_cmd or 'edit') .. ' ' .. vim.fn.fnameescape(vim.fn.expand(path)))
+end
+
+-- Compute the wiki index path for wiki #n (0-based) from config.
+local function _wiki_index_path(n)
+  local opts = config.options
+  local w   = opts.wikis and opts.wikis[(n or 0) + 1]
+  local root = (w and w.root) or opts.wiki_root or '~/vimwiki'
+  local idx  = (w and w.index) or 'index'
+  local ext  = (w and w.file_extension) or opts.file_extension or '.wiki'
+  if not ext:match('^%.') then ext = '.' .. ext end
+  return root .. '/' .. idx .. ext
+end
+
+-- Compute a diary file path from config. day_offset=0 → today.
+-- Pass nil for the diary index file itself.
+local function _diary_path(day_offset)
+  local opts = config.options
+  local w    = opts.wikis and opts.wikis[1]
+  local root = (w and w.root) or opts.wiki_root or '~/vimwiki'
+  local rel  = (w and w.diary_rel_path) or 'diary'
+  local ext  = (w and w.file_extension) or opts.file_extension or '.wiki'
+  if not ext:match('^%.') then ext = '.' .. ext end
+  if day_offset == nil then
+    local didx = (w and w.diary_index) or 'diary'
+    return root .. '/' .. rel .. '/' .. didx .. ext
+  end
+  local t = os.time() + day_offset * 86400
+  return root .. '/' .. rel .. '/' .. os.date('%Y-%m-%d', t) .. ext
+end
+
+-- Register global (non-buffer-local) entry-point keymaps so users can open
+-- their wiki from any buffer, not just from inside a .wiki file. Files are
+-- opened directly from config — no LSP client required; the server auto-starts
+-- once the vimwiki FileType fires on the newly opened buffer.
+local function _setup_global_mappings()
+  if vim.g.nuwiki_no_default_mappings then return end
+  local kmap = vim.keymap.set
+  local function o(d) return { silent = true, desc = 'nuwiki: ' .. d } end
+
+  kmap('n', '<Leader>ww',         function() _open(_wiki_index_path(0)) end,             o('wiki index'))
+  kmap('n', '<Leader>wt',         function() _open(_wiki_index_path(0), 'tabedit') end,  o('wiki index (tab)'))
+  kmap('n', '<Leader>ws',         function() require('nuwiki.commands').wiki_ui_select() end, o('pick wiki'))
+  kmap('n', '<Leader>wi',         function() _open(_diary_path(nil)) end,                o('diary index'))
+  kmap('n', '<Leader>w<Leader>w', function() _open(_diary_path(0)) end,                  o('today diary'))
+  kmap('n', '<Leader>w<Leader>y', function() _open(_diary_path(-1)) end,                 o('yesterday diary'))
+  kmap('n', '<Leader>w<Leader>t', function() _open(_diary_path(1)) end,                  o('tomorrow diary'))
+  kmap('n', '<Leader>w<Leader>i', function() require('nuwiki.commands').diary_generate_index() end, o('rebuild diary index'))
+end
+
 function M.setup(opts)
   config.apply(opts or {})
 
@@ -30,6 +82,7 @@ function M.setup(opts)
   end
 
   lsp.register()
+  _setup_global_mappings()
 end
 
 function M.install()

lua/nuwiki/keymaps.lua

@@ -160,8 +160,8 @@ function M.attach(bufnr, mappings)
 
   -- ===== Wiki prefix (`<Leader>w*`) =====
   if on('wiki_prefix') then
-    map('n', '<Leader>ww', cmd.diary_today,    { desc = 'nuwiki: open default wiki / today' }, bufnr)
-    map('n', '<Leader>wt', cmd.diary_today,    { desc = 'nuwiki: open today\'s diary' }, bufnr)
+    map('n', '<Leader>ww', function() cmd.wiki_index(0) end,     { desc = 'nuwiki: open wiki index' }, bufnr)
+    map('n', '<Leader>wt', function() cmd.wiki_tab_index(0) end, { desc = 'nuwiki: open wiki index (tab)' }, bufnr)
     map('n', '<Leader>ws', cmd.wiki_ui_select, { desc = 'nuwiki: pick wiki' }, bufnr)
     map('n', '<Leader>wi', cmd.diary_index,    { desc = 'nuwiki: open diary index' }, bufnr)
     map('n', '<Leader>w<Leader>w', cmd.diary_today,     { desc = 'nuwiki: today' }, bufnr)