Refactor color functions

src/color.cc

@@ -1,5 +1,6 @@
 #include "color.hh"
 
+#include "containers.hh"
 #include "exception.hh"
 #include "regex.hh"
 
@@ -8,30 +9,28 @@
 namespace Kakoune
 {
 
+static constexpr const char* color_names[] = {
+    "default",
+    "black",
+    "red",
+    "green",
+    "yellow",
+    "blue",
+    "magenta",
+    "cyan",
+    "white",
+};
+
 bool is_color_name(StringView color)
 {
-    return color == "default" or
-           color == "black" or
-           color == "red" or
-           color == "green" or
-           color == "yellow" or
-           color == "blue" or
-           color == "magenta" or
-           color == "cyan" or
-           color == "white";
+    return contains(color_names, color);
 }
 
 Color str_to_color(StringView color)
 {
-    if (color == "default") return Colors::Default;
-    if (color == "black")   return Colors::Black;
-    if (color == "red")     return Colors::Red;
-    if (color == "green")   return Colors::Green;
-    if (color == "yellow")  return Colors::Yellow;
-    if (color == "blue")    return Colors::Blue;
-    if (color == "magenta") return Colors::Magenta;
-    if (color == "cyan")    return Colors::Cyan;
-    if (color == "white")   return Colors::White;
+    auto it = find_if(color_names, [&](const char* c){ return color == c; });
+    if (it != std::end(color_names))
+        return static_cast<Colors>(it - color_names);
 
     static const Regex rgb_regex{"rgb:[0-9a-fA-F]{6}"};
     if (regex_match(color.begin(), color.end(), rgb_regex))
@@ -48,26 +47,18 @@ Color str_to_color(StringView color)
 
 String color_to_str(Color color)
 {
-    switch (color.color)
+    if (color.color == Colors::RGB)
     {
-        case Colors::Default: return "default";
-        case Colors::Black:   return "black";
-        case Colors::Red:     return "red";
-        case Colors::Green:   return "green";
-        case Colors::Yellow:  return "yellow";
-        case Colors::Blue:    return "blue";
-        case Colors::Magenta: return "magenta";
-        case Colors::Cyan:    return "cyan";
-        case Colors::White:   return "white";
-        case Colors::RGB:
-        {
-            char buffer[11];
-            sprintf(buffer, "rgb:%02x%02x%02x", color.r, color.g, color.b);
-            return buffer;
-        }
+        char buffer[11];
+        sprintf(buffer, "rgb:%02x%02x%02x", color.r, color.g, color.b);
+        return buffer;
+    }
+    else
+    {
+        size_t index = static_cast<size_t>(color.color);
+        kak_assert(index < std::end(color_names) - std::begin(color_names));
+        return color_names[index];
     }
-    kak_assert(false);
-    return "default";
 }
 
 String option_to_string(Color color)