remove unused special color "ignore"

Resolve lint warning about unused method "rgb_color_t::ignore()".

Fixes #2893

.gitignore

@@ -39,3 +39,5 @@ lexicon.txt
 lexicon_filter
 lexicon.log
 DerivedData/
+compile_commands.json
+xcodebuild.log

src/builtin_set_color.cpp

@@ -137,7 +137,7 @@ static int builtin_set_color(parser_t &parser, io_streams_t &streams, wchar_t **
     for (; w.woptind < argc; w.woptind++)
     {
         rgb_color_t fg = rgb_color_t(argv[w.woptind]);
-        if (fg.is_none() || fg.is_ignore())
+        if (fg.is_none())
         {
             streams.err.append_format(_(L"%ls: Unknown color '%ls'\n"), argv[0], argv[w.woptind]);
             return STATUS_BUILTIN_ERROR;
@@ -155,10 +155,10 @@ static int builtin_set_color(parser_t &parser, io_streams_t &streams, wchar_t **
     // #1323: We may have multiple foreground colors. Choose the best one.
     // If we had no foreground coor, we'll get none(); if we have at least one we expect not-none
     const rgb_color_t fg = best_color(fgcolors, output_get_color_support());
-    assert(fgcolors.empty() || !(fg.is_none() || fg.is_ignore()));
+    assert(fgcolors.empty() || !fg.is_none());
 
     const rgb_color_t bg = rgb_color_t(bgcolor ? bgcolor : L"");
-    if (bgcolor && (bg.is_none() || bg.is_ignore()))
+    if (bgcolor && bg.is_none())
     {
         streams.err.append_format(_(L"%ls: Unknown color '%ls'\n"), argv[0], bgcolor);
         return STATUS_BUILTIN_ERROR;

src/color.cpp

@@ -1,6 +1,4 @@
-/** \file color.cpp Color class implementation
-*/
-
+// Color class implementation.
 #include "color.h"
 #include "fallback.h" // IWYU pragma: keep
 #include <assert.h>
@@ -21,10 +19,6 @@ bool rgb_color_t::try_parse_special(const wcstring &special)
     {
         this->type = type_reset;
     }
-    else if (! wcscasecmp(name, L"ignore"))
-    {
-        this->type = type_ignore;
-    }
     else
     {
         this->type = type_none;
@@ -240,22 +234,22 @@ rgb_color_t rgb_color_t::normal()
 {
     return rgb_color_t(type_normal);
 }
+
 rgb_color_t rgb_color_t::reset()
 {
     return rgb_color_t(type_reset);
 }
-rgb_color_t rgb_color_t::ignore()
-{
-    return rgb_color_t(type_ignore);
-}
+
 rgb_color_t rgb_color_t::none()
 {
     return rgb_color_t(type_none);
 }
+
 rgb_color_t rgb_color_t::white()
 {
     return rgb_color_t(type_named, 7);
 }
+
 rgb_color_t rgb_color_t::black()
 {
     return rgb_color_t(type_named, 0);
@@ -382,8 +376,6 @@ wcstring rgb_color_t::description() const
             return L"reset";
         case type_normal:
             return L"normal";
-        case type_ignore:
-            return L"ignore";
         default:
             abort();
             return L"";

src/color.h

@@ -1,5 +1,4 @@
-/** \file color.h Color class.
-  */
+// Color class.
 #ifndef FISH_COLOR_H
 #define FISH_COLOR_H
 
@@ -24,8 +23,7 @@ class rgb_color_t
         type_named,
         type_rgb,
         type_normal,
-        type_reset,
-        type_ignore
+        type_reset
     };
     unsigned char type:4;
 
@@ -79,18 +77,9 @@ public:
     /** Returns the normal special color */
     static rgb_color_t normal();
 
-    /** Returns the ignore special color */
-    static rgb_color_t ignore();
-
     /** Returns the none special color */
     static rgb_color_t none();
 
-    /** Returns whether the color is the ignore special color */
-    bool is_ignore(void) const
-    {
-        return type == type_ignore;
-    }
-
     /** Returns whether the color is the normal special color */
     bool is_normal(void) const
     {

src/output.cpp

@@ -246,25 +246,17 @@ void set_color(rgb_color_t c, rgb_color_t c2)
         was_underline=0;
     }
 
-    if (! last_color2.is_normal() &&
-            ! last_color2.is_reset() &&
-            ! last_color2.is_ignore())
+    if (!last_color2.is_normal() && !last_color2.is_reset())
     {
-        /*
-             Background was set
-             */
-        last_bg_set=1;
+        // Background was set.
+        last_bg_set = 1;
     }
 
-    if (! c2.is_normal() &&
-            ! c2.is_ignore())
+    if (!c2.is_normal())
     {
-        /*
-             Background is set
-             */
-        bg_set=1;
-        if (c==c2)
-            c = (c2==rgb_color_t::white())?rgb_color_t::black():rgb_color_t::white();
+        // Background is set.
+        bg_set = 1;
+        if (c == c2) c = (c2==rgb_color_t::white())?rgb_color_t::black():rgb_color_t::white();
     }
 
     if ((enter_bold_mode != 0) && (strlen(enter_bold_mode) > 0))

src/output.h

@@ -27,9 +27,7 @@ enum
     FISH_COLOR_MAGENTA,
     FISH_COLOR_CYAN,
     FISH_COLOR_WHITE,
-    /** The default fg color of the terminal */
-    FISH_COLOR_NORMAL,
-    FISH_COLOR_IGNORE,
+    FISH_COLOR_NORMAL,  // the default fg color of the terminal
     FISH_COLOR_RESET
 };
 
@@ -41,9 +39,8 @@ enum
    screen to flicker, the function takes care to write as little as
    possible.
 
-   Possible values for color are any form the FISH_COLOR_* enum,
-   FISH_COLOR_IGNORE and FISH_COLOR_RESET. FISH_COLOR_IGNORE will
-   leave the color unchanged, and FISH_COLOR_RESET will perform an
+   Possible values for color are any form the FISH_COLOR_* enum
+   and FISH_COLOR_RESET. FISH_COLOR_RESET will perform an
    exit_attribute_mode, even if set_color thinks it is already in
    FISH_COLOR_NORMAL mode.