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.

2 files changed, 69 insertions, 66 deletions

diff --git a/doc/muwiki.txt b/doc/muwiki.txt
index 4576388..878095d 100644
--- a/doc/muwiki.txt
+++ b/doc/muwiki.txt
@@ -12,7 +12,6 @@ CONTENTS                                                *muwiki-contents*
 5. Keymaps ................................ |muwiki-keymaps|
 6. Link Format ............................ |muwiki-link-format|
 7. External Handlers ...................... |muwiki-external-handlers|
-8. Templates .............................. |muwiki-templates|
 
 ==============================================================================
 1. INTRODUCTION                                     *muwiki-introduction*
@@ -24,7 +23,6 @@ Features:~
 - Standard markdown links `[text](url)`
 - Multiple wiki directories support
 - External link handlers for custom URL/file opening
-- Automatic templates for new pages
 - Link navigation with custom keymaps
 
 Requirements:~
@@ -51,20 +49,39 @@ Using lazy.nvim:~
         local muwiki = require('muwiki')
         muwiki.setup(opts)
 
-        local group = vim.api.nvim_create_augroup("MuWikiKeymaps", { clear = true })
+        local group = vim.api.nvim_create_augroup("muwiki", { clear = true })
 
+        -- Setup wiki keymaps for markdown files
         vim.api.nvim_create_autocmd("FileType", {
           group = group,
           pattern = "markdown",
-          callback = function(ev)
-            if not muwiki.wiki_root(ev.buf) then return end
-            local keymap_opts = { buffer = ev.buf, silent = true, nowait = true }
+          callback = function(args)
+            if not muwiki.wiki_root(args.buf) then return end
+            
+            local keymap_opts = { buffer = args.buf, silent = true, nowait = true }
             vim.keymap.set('n', '<CR>', muwiki.open_link, keymap_opts)
             vim.keymap.set('n', '<Tab>', muwiki.next_link, keymap_opts)
             vim.keymap.set('n', '<S-Tab>', muwiki.prev_link, keymap_opts)
             vim.keymap.set('v', '<CR>', muwiki.create_link, keymap_opts)
           end,
         })
+
+        -- Auto-create parent directories when saving files in wiki
+        vim.api.nvim_create_autocmd("BufWritePre", {
+          group = group,
+          callback = function(args)
+            local wiki_root = muwiki.wiki_root(args.buf)
+            if not wiki_root then return end
+            
+            local file = args.file
+            if not vim.startswith(file, wiki_root) then return end
+
+            local dir = vim.fn.fnamemodify(file, ":h")
+            if vim.fn.isdirectory(dir) == 0 then
+              vim.fn.mkdir(dir, "p")
+            end
+          end,
+        })
       end,
     }
 <
@@ -79,15 +96,6 @@ Configuration Options:~
     index_file              Name of the wiki index file
                             Default: 'index.md'
 
-    date_fmt                Date format string for templates
-                            Default: '%Y-%m-%d'
-
-    use_template            Enable automatic templates for new pages
-                            Default: false
-
-    template                Template content with placeholders
-                            See |muwiki-templates|
-
     use_external_handlers   Enable external URL/file handlers
                             Default: false
 
@@ -101,15 +109,6 @@ Configuration Options:~
                             to force editor opening.
                             Default: { 'md', 'txt' }
 
-    create_missing_dirs     Automatically create missing parent directories
-                            when opening or creating wiki files.
-                            Values:
-                              false    - Don't create directories (default)
-                              'notify' - Create and show notification
-                              'prompt' - Ask before creating
-                            Directories are only created within wiki root.
-                            Default: false
-
 Example:~
 >lua
     {
@@ -124,15 +123,6 @@ Example:~
           { name = 'test',    path = '~/wiki_test' },
         },
         index_file = 'index.md',
-        create_missing_dirs = 'notify',
-        date_fmt = '%Y-%m-%d',
-        use_template = true,
-        template = [[
-    ---
-    title: ${title}
-    date: ${date}
-    ---
-    ]],
         text_extensions = { 'md', 'txt' },
         use_external_handlers = true,
         external_handlers = {
@@ -168,14 +158,16 @@ Example:~
         local muwiki = require('muwiki')
         muwiki.setup(opts)
 
-        local group = vim.api.nvim_create_augroup("MuWikiKeymaps", { clear = true })
+        local group = vim.api.nvim_create_augroup("muwiki", { clear = true })
 
+        -- Setup wiki keymaps for markdown files
         vim.api.nvim_create_autocmd("FileType", {
           group = group,
           pattern = "markdown",
-          callback = function(ev)
-            if not muwiki.wiki_root(ev.buf) then return end
-            local keymap_opts = { buffer = ev.buf, silent = true, nowait = true }
+          callback = function(args)
+            if not muwiki.wiki_root(args.buf) then return end
+            
+            local keymap_opts = { buffer = args.buf, silent = true, nowait = true }
             vim.keymap.set('n', '<CR>', muwiki.open_link, keymap_opts)
             vim.keymap.set('n', '<Tab>', muwiki.next_link, keymap_opts)
             vim.keymap.set('n', '<S-Tab>', muwiki.prev_link, keymap_opts)
@@ -183,6 +175,23 @@ Example:~
             vim.keymap.set('n', '<leader>oo', muwiki.open_link_with, keymap_opts)
           end,
         })
+
+        -- Auto-create parent directories when saving files in wiki
+        vim.api.nvim_create_autocmd("BufWritePre", {
+          group = group,
+          callback = function(args)
+            local wiki_root = muwiki.wiki_root(args.buf)
+            if not wiki_root then return end
+            
+            local file = args.file
+            if not vim.startswith(file, wiki_root) then return end
+
+            local dir = vim.fn.fnamemodify(file, ":h")
+            if vim.fn.isdirectory(dir) == 0 then
+              vim.fn.mkdir(dir, "p")
+            end
+          end,
+        })
       end,
     }
 <
@@ -277,14 +286,16 @@ Configure keymaps using an autocmd to ensure they only apply within wiki
 directories: >lua
     local muwiki = require('muwiki')
 
-    local group = vim.api.nvim_create_augroup("MuWikiKeymaps", { clear = true })
+    local group = vim.api.nvim_create_augroup("muwiki", { clear = true })
 
+    -- Setup wiki keymaps for markdown files
     vim.api.nvim_create_autocmd("FileType", {
       group = group,
       pattern = "markdown",
-      callback = function(ev)
-        if not muwiki.wiki_root(ev.buf) then return end
-        local opts = { buffer = ev.buf, silent = true, nowait = true }
+      callback = function(args)
+        if not muwiki.wiki_root(args.buf) then return end
+        
+        local opts = { buffer = args.buf, silent = true, nowait = true }
         vim.keymap.set('n', '<CR>', muwiki.open_link, opts)
         vim.keymap.set('n', '<Tab>', muwiki.next_link, opts)
         vim.keymap.set('n', '<S-Tab>', muwiki.prev_link, opts)
@@ -292,6 +303,23 @@ directories: >lua
         vim.keymap.set('n', '<leader>oo', muwiki.open_link_with, opts)
       end,
     })
+
+    -- Auto-create parent directories when saving files in wiki
+    vim.api.nvim_create_autocmd("BufWritePre", {
+      group = group,
+      callback = function(args)
+        local wiki_root = muwiki.wiki_root(args.buf)
+        if not wiki_root then return end
+        
+        local file = args.file
+        if not vim.startswith(file, wiki_root) then return end
+
+        local dir = vim.fn.fnamemodify(file, ":h")
+        if vim.fn.isdirectory(dir) == 0 then
+          vim.fn.mkdir(dir, "p")
+        end
+      end,
+    })
 <
 Note: Actions check if the buffer is within a configured wiki directory and
 notify the user if not.
@@ -409,30 +437,6 @@ Example: Open PNG files in Neovim (as text/hex) instead of external viewer:~
     text_extensions = { 'md', 'txt', 'png' }
 <
 ==============================================================================
-8. TEMPLATES                                         *muwiki-templates*
-
-Automatic templates can be applied when creating new wiki pages.
-
-Enable templates:~
->lua
-    require("muwiki").setup({
-      use_template = true,
-    })
-<
-Template Placeholders:~
-
-    ${title}    Page title (derived from filename)
-    ${date}     Current date (formatted with `date_fmt`)
-
-Default Template:~
->lua
-    template = [[
----
-title: ${title}
-date: ${date}
----
-]]
-<
 ==============================================================================
 HEALTH CHECKING                                        *muwiki-health*
 
diff --git a/doc/tags b/doc/tags
index f52890d..300649b 100644
--- a/doc/tags
+++ b/doc/tags
@@ -7,7 +7,6 @@ muwiki-installation	muwiki.txt	/*muwiki-installation*
 muwiki-introduction	muwiki.txt	/*muwiki-introduction*
 muwiki-keymaps	muwiki.txt	/*muwiki-keymaps*
 muwiki-link-format	muwiki.txt	/*muwiki-link-format*
-muwiki-templates	muwiki.txt	/*muwiki-templates*
 muwiki.next_link()	muwiki.txt	/*muwiki.next_link()*
 muwiki.open_index()	muwiki.txt	/*muwiki.open_index()*
 muwiki.open_link()	muwiki.txt	/*muwiki.open_link()*