fix(files): Use full match when finding bufnr for filename

In certain situations, buffer number for an org file was matched on it's
archive location (.org_archive extension).
For example, if two buffers are opened, one being
`/path/to/org/todos.org` and `/path/to/org/todos.org_archive`, doing
`vim.fn.bufnr('/path/to/org/todos.org')` could return the archive file
because of the partial match.
This is now fixed by doing a strict match
`vim.fn.bufnr('^/path/to/org/todos.org$')`

Author: kristijanhusak

lua/orgmode/api/file.lua

@@ -113,7 +113,7 @@ end
 --- @return string
 function OrgFile:get_link()
   local filename = self.filename
-  local bufnr = vim.fn.bufnr(filename)
+  local bufnr = vim.fn.bufnr('^' .. filename .. '$')
 
   if bufnr == -1 or not vim.api.nvim_buf_is_loaded(bufnr) then
     -- do remote edit

lua/orgmode/api/headline.lua

@@ -276,7 +276,7 @@ end
 --- @return string
 function OrgHeadline:get_link()
   local filename = self.file.filename
-  local bufnr = vim.fn.bufnr(filename)
+  local bufnr = vim.fn.bufnr('^' .. filename .. '$')
 
   if bufnr == -1 or not vim.api.nvim_buf_is_loaded(bufnr) then
     -- do remote edit

lua/orgmode/api/init.lua

@@ -81,7 +81,7 @@ function OrgApi.refile(opts)
     refile_opts.destination_headline = opts.destination._section
   end
 
-  local source_bufnr = vim.fn.bufnr(opts.source.file.filename) or -1
+  local source_bufnr = vim.fn.bufnr('^' .. opts.source.file.filename .. '$') or -1
   local is_capture = source_bufnr > -1 and vim.b[source_bufnr].org_capture
 
   if is_capture and orgmode.capture._window then

lua/orgmode/files/file.lua

@@ -60,7 +60,7 @@ end
 ---Load the file
 ---@return OrgPromise<OrgFile | false>
 function OrgFile.load(filename)
-  local bufnr = vim.fn.bufnr(filename) or -1
+  local bufnr = vim.fn.bufnr('^' .. filename .. '$') or -1
 
   if
     bufnr > -1
@@ -534,7 +534,7 @@ end
 
 ---@return number
 function OrgFile:bufnr()
-  local bufnr = vim.fn.bufnr(self.filename) or -1
+  local bufnr = vim.fn.bufnr('^' .. self.filename .. '$') or -1
   -- Do not consider unloaded buffers as valid
   -- Treesitter is not working in them
   if bufnr > -1 and vim.api.nvim_buf_is_loaded(bufnr) then
@@ -546,7 +546,7 @@ end
 ---Return valid buffer handle or throw an error if it's not valid
 ---@return number
 function OrgFile:get_valid_bufnr()
-  local bufnr = vim.fn.bufnr(self.filename) or -1
+  local bufnr = vim.fn.bufnr('^' .. self.filename .. '$') or -1
   if bufnr < 0 then
     error('[orgmode] No valid buffer for file ' .. self.filename .. ' to edit', 0)
   end