Add ColorStyle::Custom for theme-independent coloring

Moved `color_id` to curses backend.

src/backend/curses/mod.rs

@@ -1,4 +1,4 @@
-use theme::{BaseColor, Color};
+use theme::{BaseColor, Color, ColorStyle};
 
 #[cfg(feature = "ncurses")]
 mod n;
@@ -38,3 +38,19 @@ fn find_closest(color: &Color) -> u8 {
         Color::RgbLowRes(r, g, b) => (16 + 36 * r + 6 * g + b) as u8,
     }
 }
+
+fn color_id(style: ColorStyle) -> i16 {
+    match style {
+        ColorStyle::Background => 1,
+        ColorStyle::Shadow => 2,
+        ColorStyle::Primary => 3,
+        ColorStyle::Secondary => 4,
+        ColorStyle::Tertiary => 5,
+        ColorStyle::TitlePrimary => 6,
+        ColorStyle::TitleSecondary => 7,
+        ColorStyle::Highlight => 8,
+        ColorStyle::HighlightInactive => 9,
+        ColorStyle::Custom { front, back } => 10,
+
+    }
+}

src/backend/curses/n.rs

@@ -1,7 +1,7 @@
 extern crate ncurses;
 
 
-use self::super::find_closest;
+use self::super::{color_id, find_closest};
 use backend;
 use event::{Event, Key};
 use theme::{Color, ColorStyle, Effect};
@@ -23,7 +23,7 @@ impl backend::Backend for Concrete {
         ncurses::start_color();
         ncurses::curs_set(ncurses::CURSOR_VISIBILITY::CURSOR_INVISIBLE);
         ncurses::wbkgd(ncurses::stdscr(),
-                       ncurses::COLOR_PAIR(ColorStyle::Background.id()));
+                       ncurses::COLOR_PAIR(color_id(ColorStyle::Background)));
 
         Concrete
     }
@@ -48,7 +48,7 @@ impl backend::Backend for Concrete {
                         background: &Color) {
         // TODO: build the color on the spot
 
-        ncurses::init_pair(style.id(),
+        ncurses::init_pair(color_id(style),
                            find_closest(foreground) as i16,
                            find_closest(background) as i16);
     }
@@ -58,7 +58,7 @@ impl backend::Backend for Concrete {
         let mut current_color: i16 = 0;
         ncurses::attr_get(&mut current_style, &mut current_color);
 
-        let style = ncurses::COLOR_PAIR(color.id());
+        let style = ncurses::COLOR_PAIR(color_id(color));
         ncurses::attron(style);
         f();
         // ncurses::attroff(style);

src/backend/curses/pan.rs

@@ -2,7 +2,7 @@ extern crate pancurses;
 
 
 
-use self::super::find_closest;
+use self::super::{color_id, find_closest};
 use backend;
 use event::{Event, Key};
 use theme::{Color, ColorStyle, Effect};
@@ -21,7 +21,7 @@ impl backend::Backend for Concrete {
         pancurses::cbreak();
         pancurses::start_color();
         pancurses::curs_set(0);
-        window.bkgd(pancurses::ColorPair(ColorStyle::Background.id() as u8));
+        window.bkgd(pancurses::ColorPair(color_id(ColorStyle::Background) as u8));
 
         Concrete { window: window }
     }
@@ -41,14 +41,14 @@ impl backend::Backend for Concrete {
 
     fn init_color_style(&mut self, style: ColorStyle, foreground: &Color,
                         background: &Color) {
-        pancurses::init_pair(style.id(),
+        pancurses::init_pair(color_id(style),
                              find_closest(foreground) as i16,
                              find_closest(background) as i16);
     }
 
     fn with_color<F: FnOnce()>(&self, color: ColorStyle, f: F) {
         let (_, current_color_pair) = self.window.attrget();
-        let color_attribute = pancurses::ColorPair(color.id() as u8);
+        let color_attribute = pancurses::ColorPair(color_id(color) as u8);
 
         self.window.attron(color_attribute);
         f();

src/theme.rs

@@ -158,23 +158,13 @@ pub enum ColorStyle {
     Highlight,
     /// Highlight color for inactive views (not in focus).
     HighlightInactive,
-}
-
-impl ColorStyle {
-    /// Returns the ncurses pair ID associated with this color pair.
-    pub fn id(self) -> i16 {
-        match self {
-            ColorStyle::Background => 1,
-            ColorStyle::Shadow => 2,
-            ColorStyle::Primary => 3,
-            ColorStyle::Secondary => 4,
-            ColorStyle::Tertiary => 5,
-            ColorStyle::TitlePrimary => 6,
-            ColorStyle::TitleSecondary => 7,
-            ColorStyle::Highlight => 8,
-            ColorStyle::HighlightInactive => 9,
-        }
-    }
+    /// Directly specifies colors, independently of the theme.
+    Custom {
+        /// Foreground color
+        front: Color,
+        /// Background color
+        back: Color
+    },
 }
 
 /// Represents the style a Cursive application will use.
@@ -288,7 +278,7 @@ impl BorderStyle {
 /// Color configuration for the application.
 ///
 /// Assign each color role an actual color.
-#[derive(Clone,Debug)]
+#[derive(Copy,Clone,Debug)]
 pub struct Palette {
     /// Color used for the application background.
     pub background: Color,
@@ -405,8 +395,6 @@ pub enum Color {
     RgbLowRes(u8, u8, u8),
 }
 
-impl Color {}
-
 /// Possible error returned when loading a theme.
 #[derive(Debug)]
 pub enum Error {