Feature: Command to change file extension

4 files changed, 42 insertions, 13 deletions

diff --git a/README.md b/README.md
index 24fd0db..fea44da 100644
--- a/README.md
+++ b/README.md
@@ -43,8 +43,9 @@ Maybe you want to set keymaps for the commands as well
 ```lua
 vim.keymap.set({'n','v'}, '<leader>nn', ":Denote note<cr>",      { desc = "New note"         })
 vim.keymap.set({'n','v'}, '<leader>nt', ":Denote title<cr>",     { desc = "Change title"     })
-vim.keymap.set({'n','v'}, '<leader>nk', ":Denote keywords<cr>",  { desc = "Change keywords"      })
+vim.keymap.set({'n','v'}, '<leader>nk', ":Denote keywords<cr>",  { desc = "Change keywords"  })
 vim.keymap.set({'n','v'}, '<leader>nz', ":Denote signature<cr>", { desc = "Change signature" })
+vim.keymap.set({'n','v'}, '<leader>ne', ":Denote extension<cr>", { desc = "Change extension" })
 ```
 
 ## Manual Install
@@ -85,6 +86,9 @@ require('simple-denote').setup({
 " Rename the current note with a signature
 " This has a user-defined meaning and no particular purpose
 :Denote signature
+
+" Rename the current file to a new extension
+:Denote extension
 ```
 
 # Credits
diff --git a/lua/simple-denote.lua b/lua/simple-denote.lua
index 8ac2193..5709e3a 100644
--- a/lua/simple-denote.lua
+++ b/lua/simple-denote.lua
@@ -12,14 +12,16 @@ function M.load_cmd(options)
     elseif opts.fargs[1] == "keywords" then
       api.keywords(options)
     elseif opts.fargs[1] == "signature" then
-      api.signature(options)
+      api.signature()
+    elseif opts.fargs[1] == "extension" then
+      api.extension()
     else
       error("Unsupported operation " .. opts.fargs[1])
     end
   end, {
     nargs = 1,
     complete = function()
-      return { "note", "title", "keywords", "signature" }
+      return { "note", "title", "keywords", "signature", "extension" }
     end,
   })
 end
diff --git a/lua/simple-denote/api.lua b/lua/simple-denote/api.lua
index c26bafd..a03c9f2 100644
--- a/lua/simple-denote/api.lua
+++ b/lua/simple-denote/api.lua
@@ -4,7 +4,7 @@ local internal = require("simple-denote.internal")
 
 ---@param options table
 ---@param title string|nil
----@param keywords table|nil
+---@param keywords string|nil
 function M.note(options, title, keywords)
   if not title then
     vim.ui.input({ prompt = "Note title: " }, function(input)
@@ -38,7 +38,7 @@ end
 
 ---@param options table
 ---@param filename string|nil
----@param keywords table|nil
+---@param keywords string|nil
 function M.keywords(options, filename, keywords)
   if not filename then
     filename = vim.fn.expand("%")
@@ -52,10 +52,9 @@ function M.keywords(options, filename, keywords)
   internal.keyword(options, filename, keywords)
 end
 
----@param options table
 ---@param filename string|nil
----@param sig string
-function M.signature(options, filename, sig)
+---@param sig string|nil
+function M.signature(filename, sig)
   filename = filename or vim.fn.expand("%")
   if not sig then
     vim.ui.input({ prompt = "Signature: " }, function(input)
@@ -63,7 +62,21 @@ function M.signature(options, filename, sig)
     end)
   end
   if not sig then return end
-  internal.signature(options, filename, sig)
+  internal.signature(filename, sig)
+end
+
+---@param filename string|nil
+---@param ext string|nil
+function M.extension(filename, ext)
+  filename = filename or vim.fn.expand("%")
+  if not ext then
+    vim.ui.input({ prompt = "Extension: " }, function(input)
+      ext = input
+    end)
+  end
+  if not ext then return end
+  internal.extension(filename, ext)
 end
 
+
 return M
diff --git a/lua/simple-denote/internal.lua b/lua/simple-denote/internal.lua
index 73ba71f..8821689 100644
--- a/lua/simple-denote/internal.lua
+++ b/lua/simple-denote/internal.lua
@@ -18,7 +18,7 @@ function M.plain_format(str)
 end
 
 ---@param str string
----@param char delimiter that replaces spaces (- for titles, _ for keywords, = for sigs)
+---@param char string delimiter that replaces spaces (- for titles, _ for keywords, = for sigs)
 ---Format the title/keywords/sig string of a Denote filename
 function M.format_denote_string(str, char)
   str = M.plain_format(str)
@@ -28,7 +28,6 @@ function M.format_denote_string(str, char)
 end
 
 ---@param title string heading text
----@param ext string file extension
 ---Set the first line to title if it's an empty buffer or the first line is a heading
 function M.set_heading(options, title)
   if title == "" then return end
@@ -108,11 +107,10 @@ function M.keyword(options, filename, keywords)
   M.replace_file(filename, new_filename)
 end
 
----@param options table
 ---@param filename string
 ---@param sig string
 ---Add/change the ==signature in the filename
-function M.signature(options, filename, sig)
+function M.signature(filename, sig)
   local prefix, suffix = filename:match("^(.-%d%d%d%d%d%d%d%dT%d%d%d%d%d%d)(.*)")
   if not prefix then
     error("This doesn't look like a Denote filename")
@@ -123,4 +121,16 @@ function M.signature(options, filename, sig)
   M.replace_file(filename, new_filename)
 end
 
+---@param filename string
+---@param ext string
+---Replace the extension in the file with ext
+function M.extension(filename, ext)
+  local prefix, _ = filename:match("^(.-%d%d%d%d%d%d%d%dT%d%d%d%d%d%d.*%.)(.+)$")
+  if not prefix then
+    error("This doesn't look like a Denote file")
+  end
+  local new_filename = prefix .. ext
+  M.replace_file(filename, new_filename)
+end
+
 return M