Use list for the tags completion table, not obarray

* lisp/progmodes/etags.el (etags-tags-completion-table): Return a
list instead of an obarray
(http://lists.gnu.org/archive/html/emacs-devel/2015-05/msg00876.html).
(tags-completion-table): Combine those lists.
(tags-completion-table): Update the docstring.

1 files changed, 9 insertions, 13 deletions

diff --git a/lisp/progmodes/etags.el b/lisp/progmodes/etags.el
index 9ff164e15ef..329d899a588 100644
--- a/lisp/progmodes/etags.el
+++ b/lisp/progmodes/etags.el
@@ -204,7 +204,7 @@ nil means it has not yet been computed;
 use function `tags-table-files' to do so.")
 
 (defvar tags-completion-table nil
-  "Obarray of tag names defined in current tags table.")
+  "List of tag names defined in current tags table.")
 
 (defvar tags-included-tables nil
   "List of tags tables included by the current tags table.")
@@ -759,23 +759,19 @@ tags table and its (recursively) included tags tables."
   (or tags-completion-table
       ;; No cached value for this buffer.
       (condition-case ()
-          (let (current-table combined-table)
+          (let (tables cont)
             (message "Making tags completion table for %s..." buffer-file-name)
             (save-excursion
               ;; Iterate over the current list of tags tables.
-              (while (visit-tags-table-buffer (and combined-table t))
+              (while (visit-tags-table-buffer cont)
                 ;; Find possible completions in this table.
-                (setq current-table (funcall tags-completion-table-function))
-                ;; Merge this buffer's completions into the combined table.
-                (if combined-table
-                    (mapatoms
-                     (lambda (sym) (intern (symbol-name sym) combined-table))
-                     current-table)
-                  (setq combined-table current-table))))
+                (push (funcall tags-completion-table-function) tables)
+                (setq cont t)))
             (message "Making tags completion table for %s...done"
                      buffer-file-name)
             ;; Cache the result in a buffer-local variable.
-            (setq tags-completion-table combined-table))
+            (setq tags-completion-table
+                  (nreverse (delete-dups (apply #'nconc tables)))))
         (quit (message "Tags completion table construction aborted.")
               (setq tags-completion-table nil)))))
 
@@ -1256,7 +1252,7 @@ buffer-local values of tags table format variables."
 
 
 (defun etags-tags-completion-table () ; Doc string?
-  (let ((table (make-vector 511 0))
+  (let (table
         (progress-reporter
          (make-progress-reporter
           (format "Making tags completion table for %s..." buffer-file-name)
@@ -1276,7 +1272,7 @@ buffer-local values of tags table format variables."
 \\([-a-zA-Z0-9_+*$?:]+\\)[^-a-zA-Z0-9_+*$?:\177]*\\)\177\
 \\(\\([^\n\001]+\\)\001\\)?\\([0-9]+\\)?,\\([0-9]+\\)?\n"
               nil t)
-        (intern (prog1 (if (match-beginning 5)
+        (push   (prog1 (if (match-beginning 5)
                            ;; There is an explicit tag name.
                            (buffer-substring (match-beginning 5) (match-end 5))
                          ;; No explicit tag name.  Best guess.