Tweak to colors of fix-it hints

Previous, fix-it hints were printed using the color of the severity
of the diagnostic (magenta for warnings, red for errors, cyan for
notes).

This patch updates fix-it hints so that replacement text is printed in
green, to better distinguish the suggested improvement from
the current code.  For example:

spellcheck-fields.cc:52:13: error: 'struct s' has no member named 'colour'; did you mean 'color'?
   return ptr->colour;  <<< RED
               ^~~~~~   <<< RED
               color    <<< GREEN

It makes sense for the underlinings that indicate deletions to
be printed in red, so the patch changes that also.  For example:

diagnostic-test-show-locus-color.c:179:9: warning: example of a removal hint
   int a;;  <<< MAGENTA
         ^  <<< MAGENTA
         -  <<< RED

gcc/ChangeLog:
	* diagnostic-color.c (color_dict): Add "fixit-insert" and
	"fixit-delete".
	(parse_gcc_colors): Update description of default GCC_COLORS.
	* diagnostic-show-locus.c (colorizer::set_fixit_hint): Delete.
	(colorizer::set_fixit_insert): New method.
	(colorizer::set_fixit_delete): New method.
	(colorizer::get_color_by_name): New method.
	(colorizer::STATE_FIXIT_INSERT): New constant.
	(colorizer::STATE_FIXIT_DELETE): New constant.
	(class colorizer): Drop "_cs" suffix from fields.  Delete "_ce"
	fields in favor of new field "m_stop_color".  Add fields
	"m_fixit_insert" and "m_fixit_delete".
	(colorizer::colorizer): Update for above changes.  Replace
	colorize_start calls with calls to get_color_by_name.
	(colorizer::begin_state): Handle STATE_FIXIT_INSERT and
	STATE_FIXIT_DELETE.  Update for field renamings.
	(colorizer::finish_state): Simplify by using m_stop_color,
	rather than multiple identical "*_ce" fields.
	(colorizer::get_color_by_name): New method.
	(layout::print_any_fixits): Print insertions and replacements
	using the "fixit-insert" color, and deletions using the
	"fixit-delete" color.
	* doc/invoke.texi (-fdiagnostics-color): Update description of
	default GCC_COLORS, and of the supported capabilities.

gcc/testsuite/ChangeLog:
	* gcc.dg/plugin/diagnostic-test-show-locus-color.c
	(test_fixit_insert): Update expected output.
	(test_fixit_remove): Likewise.
	(test_fixit_replace): Likewise.

From-SVN: r239787

1 files changed, 3 insertions, 3 deletions

diff --git a/gcc/testsuite/gcc.dg/plugin/diagnostic-test-show-locus-color.c b/gcc/testsuite/gcc.dg/plugin/diagnostic-test-show-locus-color.c
index ff2f4d4..712375e 100644
--- a/gcc/testsuite/gcc.dg/plugin/diagnostic-test-show-locus-color.c
+++ b/gcc/testsuite/gcc.dg/plugin/diagnostic-test-show-locus-color.c
@@ -161,7 +161,7 @@ void test_fixit_insert (void)
 /* { dg-begin-multiline-output "" }
     int a[2][2] = { 0, 1 , 2, 3 };
                     ^~~~
-                    {   }
+                    {   }
    { dg-end-multiline-output "" } */
 #endif
 }
@@ -175,7 +175,7 @@ void test_fixit_remove (void)
 /* { dg-begin-multiline-output "" }
    int a;;
          ^
-         -
+         -
    { dg-end-multiline-output "" } */
 #endif
 }
@@ -189,7 +189,7 @@ void test_fixit_replace (void)
 /* { dg-begin-multiline-output "" }
    gtk_widget_showall (dlg);
    ^~~~~~~~~~~~~~~~~~
-   gtk_widget_show_all
+   gtk_widget_show_all
    { dg-end-multiline-output "" } */
 #endif
 }