Change io crate & add a small shell

crates/ansii/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "ansii"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+winnow = { version = "1", default-features = false, features = ["binary", "ascii"] }

crates/ansii/src/lib.rs

@@ -0,0 +1,66 @@
+#![no_std]
+
+use winnow::Result;
+use winnow::ascii::dec_uint;
+use winnow::combinator::{alt, preceded, seq};
+use winnow::error::ContextError;
+use winnow::prelude::*;
+
+pub enum AnsiiEscape {
+    Color16(ColorPlace, Color16Type, u8),
+    Color256(u8),
+    ColorRGB(ColorPlace, u8, u8, u8),
+}
+pub enum ColorPlace {
+    Foreground,
+    Background,
+}
+pub enum Color16Type {
+    Normal,
+    Bold,
+    Brigth,
+}
+
+fn parse_color16(input: &mut &str) -> Result<AnsiiEscape> {
+    let (c, _) = preceded("[", seq!(dec_uint, "m")).parse_next(input)?;
+    if c < 30 || c == 38 || c == 48 || c > 49 {
+        Err(ContextError::new())
+    } else {
+        Ok(AnsiiEscape::Color16(
+            ColorPlace::Foreground,
+            Color16Type::Normal,
+            c,
+        ))
+    }
+}
+
+fn parse_color_rgb(input: &mut &str) -> Result<AnsiiEscape> {
+    let (t, _, r, _, g, _, b, _) = preceded(
+        "[",
+        seq!(
+            alt(("38", "48")),
+            ";",
+            dec_uint,
+            ";",
+            dec_uint,
+            ";",
+            dec_uint,
+            "m"
+        ),
+    )
+    .parse_next(input)?;
+    Ok(AnsiiEscape::ColorRGB(
+        if t == "38" {
+            ColorPlace::Foreground
+        } else {
+            ColorPlace::Background
+        },
+        r,
+        g,
+        b,
+    ))
+}
+
+pub fn parse_ansii(input: &mut &str) -> Result<AnsiiEscape> {
+    alt((parse_color_rgb, parse_color16)).parse_next(input)
+}