From df328c13903d5a0e595d27b14f79e2a61f66f8fc Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 27 Apr 2016 02:36:30 -0400
Subject: implement fgcolor and bgcolor for cells

---
 src/cell.rs    | 31 ++++++++++++++++++++++++++++++-
 src/color.rs   | 23 +++++++++++++++++++++++
 src/lib.rs     |  2 ++
 src/types.rs   |  1 +
 tests/basic.rs | 24 ++++++++++++++++++++++++
 5 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 src/color.rs

diff --git a/src/cell.rs b/src/cell.rs
index 7590e98..4c0d6fb 100644
--- a/src/cell.rs
+++ b/src/cell.rs
@@ -1,14 +1,23 @@
 use libc;
 use std;
 
+use color;
 use types;
 
 pub struct Cell(*mut types::CellImpl);
 
+#[repr(C)]
+struct CellAttrs {
+    fgcolor: types::ColorImpl,
+    bgcolor: types::ColorImpl,
+    attrs: libc::c_uchar,
+}
+
 #[repr(C)]
 struct CellPrefix {
     pub contents: [libc::c_char; 8],
     pub len: libc::size_t,
+    pub attrs: CellAttrs,
 }
 
 impl Cell {
@@ -18,8 +27,10 @@ impl Cell {
 
     pub fn contents(&self) -> &str {
         let Cell(cell_impl) = *self;
+        let prefix: *mut CellPrefix = unsafe {
+            std::mem::transmute(cell_impl)
+        };
         let contents: &[u8] = unsafe {
-            let prefix: *mut CellPrefix = std::mem::transmute(cell_impl);
             std::slice::from_raw_parts(
                 &(*prefix).contents as *const i8 as *const u8,
                 (*prefix).len
@@ -27,4 +38,22 @@ impl Cell {
         };
         std::str::from_utf8(contents).unwrap()
     }
+
+    pub fn fgcolor(&self) -> color::Color {
+        let Cell(cell_impl) = *self;
+        let prefix: *mut CellPrefix = unsafe {
+            std::mem::transmute(cell_impl)
+        };
+        let attrs = unsafe { &(*prefix).attrs };
+        color::Color::new(&attrs.fgcolor)
+    }
+
+    pub fn bgcolor(&self) -> color::Color {
+        let Cell(cell_impl) = *self;
+        let prefix: *mut CellPrefix = unsafe {
+            std::mem::transmute(cell_impl)
+        };
+        let attrs = unsafe { &(*prefix).attrs };
+        color::Color::new(&attrs.bgcolor)
+    }
 }
diff --git a/src/color.rs b/src/color.rs
new file mode 100644
index 0000000..52d9d61
--- /dev/null
+++ b/src/color.rs
@@ -0,0 +1,23 @@
+use std;
+
+use types;
+
+#[derive(Eq,PartialEq,Debug)]
+pub enum Color {
+    ColorDefault,
+    ColorIdx(u8),
+    ColorRgb(u8, u8, u8),
+}
+
+impl Color {
+    pub fn new(color_impl: &types::ColorImpl) -> Color {
+        let &types::ColorImpl(color_repr) = color_impl;
+        let bytes: [u8; 4] = unsafe { std::mem::transmute(color_repr) };
+        match bytes[3] {
+            0 => Color::ColorDefault,
+            1 => Color::ColorIdx(bytes[0]),
+            2 => Color::ColorRgb(bytes[0], bytes[1], bytes[2]),
+            _ => panic!("invalid color type"),
+        }
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index aa7d488..58d9b2c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,9 +1,11 @@
 extern crate libc;
 
 mod cell;
+mod color;
 mod ffi;
 mod screen;
 mod types;
 
 pub use screen::Screen;
 pub use cell::Cell;
+pub use color::Color;
diff --git a/src/types.rs b/src/types.rs
index fca7f97..6e82779 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -2,6 +2,7 @@ use libc;
 
 pub enum ScreenImpl {}
 pub enum CellImpl {}
+pub struct ColorImpl(pub libc::uint32_t);
 
 #[repr(C)]
 pub struct Loc {
diff --git a/tests/basic.rs b/tests/basic.rs
index 4828ea9..7af33f0 100644
--- a/tests/basic.rs
+++ b/tests/basic.rs
@@ -43,4 +43,28 @@ mod tests {
         assert_eq!(screen.cell(0, 5).unwrap().contents(), "r");
         assert_eq!(screen.cell(0, 6).unwrap().contents(), "");
     }
+
+    #[test]
+    fn cell_colors() {
+        let mut screen = vt100::Screen::new(24, 80);
+        let input = b"foo\x1b[31m\x1b[32mb\x1b[3;7;42ma\x1b[23mr";
+        screen.process(input);
+
+        assert_eq!(
+            screen.cell(0, 0).unwrap().fgcolor(),
+            vt100::Color::ColorDefault
+        );
+        assert_eq!(
+            screen.cell(0, 3).unwrap().fgcolor(),
+            vt100::Color::ColorIdx(2)
+        );
+        assert_eq!(
+            screen.cell(0, 4).unwrap().fgcolor(),
+            vt100::Color::ColorIdx(2)
+        );
+        assert_eq!(
+            screen.cell(0, 4).unwrap().bgcolor(),
+            vt100::Color::ColorIdx(2)
+        );
+    }
 }
-- 
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