bug#13837: 24.2; Make it possible to turn whitespace-mode only when there are no existing problems

[Reuben Thomas <rrt@sc3d.org>]

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Revised patch as promised. [Resent owing to addressing error the first time
around.]

=== modified file 'lisp/whitespace.el'
--- lisp/whitespace.el  2014-01-27 12:30:17 +0000
+++ lisp/whitespace.el  2014-01-28 00:41:32 +0000
@@ -1730,8 +1730,9 @@
    space-before-tab
    space-after-tab

-If REPORT-IF-BOGUS is non-nil, it reports only when there are any
-whitespace problems in buffer.
+If REPORT-IF-BOGUS is t, it reports only when there are any
+whitespace problems in buffer; if it is `never', it does not
+report problems.

 Report if some of the following whitespace problems exist:

@@ -1776,26 +1777,20 @@
    trailing
    space-after-tab

-If REPORT-IF-BOGUS is non-nil, it reports only when there are any
-whitespace problems in buffer.
+If REPORT-IF-BOGUS is t, it reports only when there are any
+whitespace problems in buffer; if it is `never', it does not
+report problems.

 Report if some of the following whitespace problems exist:

-* If `indent-tabs-mode' is non-nil:
-   empty               1. empty lines at beginning of buffer.
-   empty               2. empty lines at end of buffer.
-   trailing            3. SPACEs or TABs at end of line.
-   indentation         4. 8 or more SPACEs at beginning of line.
-   space-before-tab    5. SPACEs before TAB.
-   space-after-tab     6. 8 or more SPACEs after TAB.
-
-* If `indent-tabs-mode' is nil:
-   empty               1. empty lines at beginning of buffer.
-   empty               2. empty lines at end of buffer.
-   trailing            3. SPACEs or TABs at end of line.
-   indentation         4. TABS at beginning of line.
-   space-before-tab    5. SPACEs before TAB.
-   space-after-tab     6. 8 or more SPACEs after TAB.
+   empty               1. empty lines at beginning of buffer.
+   empty               2. empty lines at end of buffer.
+   trailing            3. SPACEs or TABs at end of line.
+   space-before-tab    4. SPACEs before TAB.
+   space-after-tab     5. 8 or more SPACEs after TAB.
+   indentation         6. If `indent-tabs-mode':
+                           8 or more SPACEs at beginning of line
+                           else: TABS at beginning of line.

 See `whitespace-style' for documentation.
 See also `whitespace-cleanup' and `whitespace-cleanup-region' for
@@ -1832,7 +1827,7 @@
                     (and (re-search-forward regexp rend t)
                          (setq has-bogus t))))
               whitespace-report-list)))
-       (when (if report-if-bogus has-bogus t)
+       (when (pcase report-if-bogus (`nil t) (`never nil) (_ has-bogus))
          (whitespace-kill-buffer whitespace-report-buffer-name)
          ;; `whitespace-indent-tabs-mode' is local to current buffer
          ;; `whitespace-tab-width' is local to current buffer

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