paint.net palette support

src/palette.rs

@@ -33,6 +33,7 @@ impl Palette {
         match path.extension().unwrap().to_str().unwrap() {
             "pal"  => Self::from_jasc(path),
             "gpl"  => Self::from_gpl(path),
+            "txt"  => Self::from_txt(path),
             "toml" => Self::from(
                 path.file_stem().as_ref().unwrap().to_str().unwrap(),
                 &read_to_string(&path).unwrap()
@@ -102,6 +103,34 @@ impl Palette {
         // todo re-insert original comments
         format!("GIMP Palette\r\n{}\r\n", colours.join("\r\n"))
     }
+
+    /// Paint.net .txt format
+    pub fn from_txt(path: PathBuf) -> Self {
+        let name = path.file_stem().unwrap().to_str().unwrap().into();
+        let mut colours = Vec::new();
+
+        for line in read_to_string(&path).unwrap().lines() {
+            // header and comments begin with ;
+            if !line.starts_with(";") {
+                // colour starts with FF
+                colours.push(Colour::from(&line[2..]));
+            }
+        }
+
+        Self { name, colours }
+    }
+
+    pub fn to_txt(&self) -> String {
+        let colours: Vec<String> = self.colours.iter().map(|colour|
+            colour.to_string().replace('#', "FF")
+        ).collect();
+
+        format!(
+            ";paint.net Palette File\r\n;Colors: {}\r\n{}\r\n",
+            self.colours.len(),
+            colours.join("\r\n")
+        )
+    }
 }
 
 /// for toml purposes
@@ -179,6 +208,22 @@ mod test {
         assert_eq!(output, expected);
     }
 
+    #[test]
+    fn palette_from_txt() {
+        let path = PathBuf::from("src/test-resources/basic/palettes/soup11.txt");
+        let output = Palette::from_txt(path);
+        let expected = crate::mock::palette::soup11();
+        assert_eq!(output, expected);
+    }
+
+    #[test]
+    fn palette_to_txt() {
+        let output = crate::mock::palette::soup11().to_txt();
+        let expected = include_str!("test-resources/basic/palettes/soup11.txt");
+
+        assert_eq!(output, expected);
+    }
+
     #[test]
     fn palette_from_toml() {
         let output = Palette::from(

src/test-resources/basic/palettes/soup11.txt

@@ -0,0 +1,16 @@
+;paint.net Palette File
+;Downloaded from Lospec.com/palette-list
+;Palette Name: soup11
+;Description: reds and blues, heavy hue shifting
+;Colors: 11
+FF4f1e45
+FF963057
+FFd74459
+FFeb7060
+FFffb383
+FFffffff
+FF7fe3bb
+FF5cbbc4
+FF457ea3
+FF384276
+FF322451