Allow font names that end in "-NN", where NN is a number

* src/font.c (font_load_for_lface): If the font-spec didn't match
any available fonts, try again without interpreting trailing "-NN"
as the font size.  For the description of the original problem, see
http://lists.gnu.org/archive/html/help-emacs-windows/2015-06/msg00001.html

1 files changed, 32 insertions, 0 deletions

diff --git a/src/font.c b/src/font.c
index 564c53ae54e..575975ced73 100644
--- a/src/font.c
+++ b/src/font.c
@@ -3337,6 +3337,38 @@ font_load_for_lface (struct frame *f, Lisp_Object *attrs, Lisp_Object spec)
       /* No font is listed for SPEC, but each font-backend may have
          different criteria about "font matching".  So, try it.  */
       entity = font_matching_entity (f, attrs, spec);
+      /* Perhaps the user asked for a font "Foobar-123", and we
+         interpreted "-123" as the size, whereas it really is part of
+         the name.  So we reset the size to nil and the family name to
+         the entire "Foobar-123" thing, and try again with that.  */
+      if (NILP (entity))
+        {
+          name = Ffont_get (spec, QCuser_spec);
+          if (STRINGP (name))
+            {
+              char *p = SDATA (name), *q = strrchr (p, '-');
+
+              if (q != NULL && c_isdigit (q[1]))
+                {
+                  char *tail;
+                  double font_size = strtod (q + 1, &tail);
+
+                  if (font_size > 0 && tail != q + 1)
+                    {
+                      Lisp_Object lsize = Ffont_get (spec, QCsize);
+
+                      if ((FLOATP (lsize) && XFLOAT_DATA (lsize) == font_size)
+                          || (INTEGERP (lsize) && XINT (lsize) == font_size))
+                        {
+                          ASET (spec, FONT_FAMILY_INDEX,
+                                font_intern_prop (p, tail - p, 1));
+                          ASET (spec, FONT_SIZE_INDEX, Qnil);
+                          entity = font_matching_entity (f, attrs, spec);
+                        }
+                    }
+                }
+            }
+        }
       if (NILP (entity))
         return Qnil;
     }