feat: 🎸 add "hex" codec

Author: streamich

src/codecs/hex.ts

@@ -0,0 +1,18 @@
+import type {CliCodec} from '../types';
+
+export class CliCodecHex implements CliCodec<'hex'> {
+  public readonly id = 'hex';
+  public readonly description = 'Same as "raw", but encodes binary data as HEX octets';
+
+  encode(value: unknown): Uint8Array {
+    const buf = value instanceof Uint8Array ? value : new TextEncoder().encode(String(value));
+    const hex = Array.from(buf)
+      .map((byte) => byte.toString(16).padStart(2, '0'))
+      .join(' ');
+    return new TextEncoder().encode(hex + '\n');
+  }
+
+  decode(bytes: Uint8Array): unknown {
+    throw new Error('Not available');
+  }
+}

src/defaultCodecs.ts

@@ -9,6 +9,7 @@ import {CliCodecRaw} from './codecs/raw';
 import {CliCodecText} from './codecs/text';
 import {CliCodecTree} from './codecs/tree';
 import {CliCodecUbjson} from './codecs/ubjson';
+import {CliCodecHex} from './codecs/hex';
 
 export const defaultCodecs = new CliCodecs();
 
@@ -22,3 +23,4 @@ defaultCodecs.register(new CliCodecUbjson(writer));
 defaultCodecs.register(new CliCodecText());
 defaultCodecs.register(new CliCodecTree());
 defaultCodecs.register(new CliCodecRaw());
+defaultCodecs.register(new CliCodecHex());