lines with 'set nohidden' to show unloaded buffers (closes issue #159)

lua/fzf-lua/previewer/builtin.lua

@@ -316,6 +316,12 @@ function Previewer.buffer_or_file:populate_preview_buf(entry_str)
     self.preview_bufnr = bufnr
     self:preview_buf_post(entry)
   else
+    if entry.bufnr then
+      -- buffer was unloaded, can happen when calling `lines`
+      -- with `set nohidden`, fix entry.path since it contains
+      -- filename only
+      entry.path = path.relative(vim.api.nvim_buf_get_name(entry.bufnr), vim.loop.cwd())
+    end
     -- mark the buffer for unloading the next call
     self.preview_bufloaded = true
     -- make sure the file is readable (or bad entry.path)

lua/fzf-lua/providers/buffers.lua

@@ -214,29 +214,33 @@ M.buffer_lines = function(opts)
     local items = {}
 
     for _, bufnr in ipairs(buffers) do
+      local data = {}
+      local filepath = api.nvim_buf_get_name(bufnr)
       if api.nvim_buf_is_loaded(bufnr) then
-        local bufname = path.basename(api.nvim_buf_get_name(bufnr))
-        local data = api.nvim_buf_get_lines(bufnr, 0, -1, false)
-        local buficon, hl
-        if opts.file_icons then
-          local filename = path.tail(bufname)
-          local extension = path.extension(filename)
-          buficon, hl = core.get_devicon(filename, extension)
-          if opts.color_icons then
-            buficon = utils.ansi_codes[hl](buficon)
-          end
-        end
-        for l, text in ipairs(data) do
-          table.insert(items, ("[%s]%s%s%s%s:%s: %s"):format(
-            utils.ansi_codes.yellow(tostring(bufnr)),
-            utils.nbsp,
-            buficon or '',
-            buficon and utils.nbsp or '',
-            utils.ansi_codes.magenta(#bufname>0 and bufname or "[No Name]"),
-            utils.ansi_codes.green(tostring(l)),
-            text))
+        data = api.nvim_buf_get_lines(bufnr, 0, -1, false)
+      elseif vim.fn.filereadable(filepath) ~= 0 then
+        data = vim.fn.readfile(filepath, "")
+      end
+      local bufname = path.basename(filepath)
+      local buficon, hl
+      if opts.file_icons then
+        local filename = path.tail(bufname)
+        local extension = path.extension(filename)
+        buficon, hl = core.get_devicon(filename, extension)
+        if opts.color_icons then
+          buficon = utils.ansi_codes[hl](buficon)
         end
       end
+      for l, text in ipairs(data) do
+        table.insert(items, ("[%s]%s%s%s%s:%s: %s"):format(
+          utils.ansi_codes.yellow(tostring(bufnr)),
+          utils.nbsp,
+          buficon or '',
+          buficon and utils.nbsp or '',
+          utils.ansi_codes.magenta(#bufname>0 and bufname or "[No Name]"),
+          utils.ansi_codes.green(tostring(l)),
+          text))
+      end
     end
 
     -- ignore bufnr when searching