* lisp/textmodes/flyspell.el (flyspell-incorrect, flyspell-duplicate):

* lisp/progmodes/flymake.el (flymake-errline, flymake-warnline):
Use underline style wave on terminals that support it. 

* src/xfaces.c (tty_supports_face_attributes_p): Return 0 for the case
of (supports :underline (:style wave)).

Fixes: debbugs:13000

etc/NEWS

@@ -205,6 +205,9 @@ property using the supplied face spec.
 *** Face specs set via Custom themes now replace the `defface' spec
 rather than inheriting from it (as do face specs set via Customize).
 
+*** New face characteristic (supports :underline (:style wave))
+specifies whether or not the terminal can display a wavy line.
+
 ** time-to-seconds is not obsolete any more.
 ** New function special-form-p.
 ** Docstrings can be made dynamic by adding a `dynamic-docstring-function'

lisp/ChangeLog

@@ -1,3 +1,9 @@
+2013-01-08  Juri Linkov  <juri@jurta.org>
+
+	* textmodes/flyspell.el (flyspell-incorrect, flyspell-duplicate):
+	* progmodes/flymake.el (flymake-errline, flymake-warnline):
+	Use underline style wave on terminals that support it.  (Bug#13000)
+
 2013-01-08  Stefan Monnier  <monnier@iro.umontreal.ca>
 
 	* emacs-lisp/pcase.el (pcase--split-equal): Also take advantage if

lisp/progmodes/flymake.el

@@ -844,13 +844,21 @@ Return t if it has at least one flymake overlay, nil if no overlay."
     has-flymake-overlays))
 
 (defface flymake-errline
-  '((t :inherit error))
+  '((((supports :underline (:style wave)))
+     :underline (:style wave :color "Red1"))
+    (t
+     :inherit error))
   "Face used for marking error lines."
+  :version "24.4"
   :group 'flymake)
 
 (defface flymake-warnline
-  '((t :inherit warning))
+  '((((supports :underline (:style wave)))
+     :underline (:style wave :color "DarkOrange"))
+    (t
+     :inherit warning))
   "Face used for marking warning lines."
+  :version "24.4"
   :group 'flymake)
 
 (defun flymake-highlight-line (line-no line-err-info-list)

lisp/textmodes/flyspell.el

@@ -445,13 +445,23 @@ like <img alt=\"Some thing.\">."
 ;;*---------------------------------------------------------------------*/
 ;;*    Highlighting                                                     */
 ;;*---------------------------------------------------------------------*/
-(defface flyspell-incorrect '((t :underline t :inherit error))
+(defface flyspell-incorrect
+  '((((supports :underline (:style wave)))
+     :underline (:style wave :color "Red1"))
+    (t
+     :underline t :inherit error))
   "Flyspell face for misspelled words."
+  :version "24.4"
   :group 'flyspell)
 
-(defface flyspell-duplicate '((t :underline t :inherit warning))
+(defface flyspell-duplicate
+  '((((supports :underline (:style wave)))
+     :underline (:style wave :color "DarkOrange"))
+    (t
+     :underline t :inherit warning))
   "Flyspell face for words that appear twice in a row.
 See also `flyspell-duplicate-distance'."
+  :version "24.4"
   :group 'flyspell)
 
 (defvar flyspell-overlay nil)

src/ChangeLog

@@ -1,3 +1,8 @@
+2013-01-08  Juri Linkov  <juri@jurta.org>
+
+	* xfaces.c (tty_supports_face_attributes_p): Return 0 for the case
+	of (supports :underline (:style wave)).  (Bug#13000)
+
 2013-01-08  Aaron S. Hawley  <aaron.s.hawley@gmail.com>
 
 	* undo.c (Fprimitive_undo): Move to simple.el.

src/xfaces.c

@@ -4877,6 +4877,8 @@ tty_supports_face_attributes_p (struct frame *f,
     {
       if (STRINGP (val))
 	return 0;		/* ttys can't use colored underlines */
+      else if (EQ (CAR_SAFE (val), QCstyle) && EQ (CAR_SAFE (CDR_SAFE (val)), Qwave))
+	return 0;		/* ttys can't use wave underlines */
       else if (face_attr_equal_p (val, def_attrs[LFACE_UNDERLINE_INDEX]))
 	return 0;		/* same as default */
       else