room/position for sprite are actually optional! you can make a sprite and never place it anywhere;

colour id for sprite

src/sprite.rs

@@ -6,8 +6,9 @@ pub struct Sprite {
     pub name: Option<String>,
     pub animation_frames: Vec<Image>,
     pub dialogue_id: Option<String>,
-    pub room_id: u64,
+    pub room_id: Option<u64>,
-    pub position: Position,
+    pub position: Option<Position>,
+    pub colour_id: Option<u64>,
 }
 
 impl Sprite {
@@ -18,6 +19,18 @@ impl Sprite {
     fn dialogue_line(&self) -> String {
         optional_data_line("DLG", self.dialogue_id.as_ref())
     }
+
+    fn room_position_line(&self) -> String {
+        if self.room_id.is_some() && self.position.is_some() {
+            format!("\nPOS {} {}", self.room_id.unwrap().to_base36(), self.position.as_ref().unwrap().to_string())
+        } else {
+            "".to_string()
+        }
+    }
+
+    fn colour_line(&self) -> String {
+        optional_data_line("COL", self.colour_id.as_ref())
+    }
 }
 
 impl From<String> for Sprite {
@@ -29,8 +42,9 @@ impl From<String> for Sprite {
         let mut dialogue_id: Option<String> = None;
         let mut room_id: Option<u64> = None;
         let mut position: Option<Position> = None;
+        let mut colour_id: Option<u64> = None;
 
-        for _ in 0..3 {
+        loop {
             let last_line = lines.pop().unwrap();
 
             if last_line.starts_with("NAME") {
@@ -41,24 +55,28 @@ impl From<String> for Sprite {
                 let last_line = last_line.replace("POS ", "");
                 let room_position: Vec<&str> = last_line.split(' ').collect();
                 room_id = Some(from_base36(&room_position[0]));
+
+                if room_position.len() < 2 {
+                    panic!("Bad room/position for sprite: {}", string);
+                }
+
                 position = Some(Position::from(room_position[1].to_string()));
+            } else if last_line.starts_with("COL") {
+                colour_id = Some(last_line.replace("COL ", "").parse().unwrap());
             } else {
                 lines.push(last_line);
                 break;
             }
         }
 
-        let room_id = room_id.unwrap();
-        let position = position.unwrap();
-
         // todo dedupe
         let animation_frames = lines[1..].join("");
-        let animation_frames: Vec<&str> = animation_frames.split("\n>\n").collect();
+        let animation_frames: Vec<&str> = animation_frames.split(">").collect();
         let animation_frames: Vec<Image> = animation_frames.iter().map(|&frame| {
             Image::from(frame.to_string())
         }).collect();
 
-        Sprite { id, name, animation_frames, dialogue_id, room_id, position }
+        Sprite { id, name, animation_frames, dialogue_id, room_id, position, colour_id }
     }
 }
 
@@ -66,13 +84,13 @@ impl ToString for Sprite {
     #[inline]
     fn to_string(&self) -> String {
         format!(
-            "SPR {}\n{}{}{}\nPOS {} {}",
+            "SPR {}\n{}{}{}{}{}",
             self.id.to_base36(),
             self.animation_frames.to_string(),
             self.name_line(),
             self.dialogue_line(),
-            self.room_id.to_base36(),
+            self.room_position_line(),
-            self.position.to_string(),
+            self.colour_line(),
         )
     }
 }