Fix tagrelative option not considered in builtin.tags

lua/telescope/builtin/__files.lua

@@ -529,6 +529,22 @@ files.current_buffer_fuzzy_find = function(opts)
 end
 
 files.tags = function(opts)
+  local tags_command = (function()
+    if 1 == vim.fn.executable "rg" then
+      return { "rg", "-H", "-N", "--no-heading", "--color", "never", "^" }
+    elseif 1 == vim.fn.executable "grep" then
+      return { "grep", "-H", "--color=never", "^"}
+    end
+  end)()
+
+  if not tags_command then
+    utils.notify("builtin.find_files", {
+      msg = "You need to install either grep or rg",
+      level = "ERROR",
+    })
+    return
+  end
+
   local tagfiles = opts.ctags_file and { opts.ctags_file } or vim.fn.tagfiles()
   for i, ctags_file in ipairs(tagfiles) do
     tagfiles[i] = vim.fn.expand(ctags_file, true)
@@ -545,7 +561,7 @@ files.tags = function(opts)
   pickers
     .new(opts, {
       prompt_title = "Tags",
-      finder = finders.new_oneshot_job(flatten { "cat", tagfiles }, opts),
+      finder = finders.new_oneshot_job(flatten { tags_command, tagfiles }, opts),
       previewer = previewers.ctags.new(opts),
       sorter = conf.generic_sorter(opts),
       attach_mappings = function()

lua/telescope/make_entry.lua

@@ -1086,7 +1086,14 @@ function make_entry.gen_from_ctags(opts)
 
   local current_file_cache = {}
   return function(line)
-    if line == "" or line:sub(1, 1) == "!" then
+    if line == "" then
+      return nil
+    end
+    local tag_file
+    tag_file, line = string.match(line, '([^:]+):(.+)')
+
+    -- do not include tag file format
+    if line:sub(1, 1) == "!" then
       return nil
     end
 
@@ -1098,6 +1105,12 @@ function make_entry.gen_from_ctags(opts)
       tag, file, lnum = string.match(line, "([^\t]+)\t([^\t]+)\t(%d+).*")
     end
 
+    -- append tag file path
+    if vim.opt.tagrelative:get() then
+      local tag_path = Path:new(tag_file):parent():make_relative(cwd)
+      file = tag_path .. "/" .. file
+    end
+
     if Path.path.sep == "\\" then
       file = string.gsub(file, "/", "\\")
     end