add new option --list-named-colors

Cargo.toml

@@ -25,6 +25,7 @@ atty = "0.2.14"
 clap = { version = "4.3.8", features = ["derive", "wrap_help"] }
 #colorgrad = "0.6.2"
 colorgrad = { git = "https://github.com/mazznoer/colorgrad-rs.git", features = ["lab", "ggr"] }
+csscolorparser = { git = "https://github.com/mazznoer/csscolorparser-rs.git" }
 svg = "0.13.1"
 terminal_size = "0.2.6"
 

src/cli.rs

@@ -136,6 +136,10 @@ pub struct Opt {
     /// Print colors from --take or --sample, as array
     #[arg(short = 'a', long)]
     pub array: bool,
+
+    /// Lists all CSS named colors
+    #[arg(long)]
+    pub list_named_colors: bool,
 }
 
 #[test]

src/main.rs

@@ -153,6 +153,17 @@ impl GradientApp {
             return Ok(0);
         }
 
+        if self.opt.list_named_colors {
+            for (&name, &[r, g, b]) in csscolorparser::NAMED_COLORS.entries() {
+                writeln!(
+                    self.stdout,
+                    "\x1B[48;2;{r};{g};{b}m   \x1B[49;38;2;{r};{g};{b}m #{r:02x}{g:02x}{b:02x}\x1B[39m {name}"
+                )?;
+            }
+
+            return Ok(0);
+        }
+
         if self.opt.preset.is_some() {
             return self.preset_gradient();
         }