[Init] Initial commit - NetMesh terminal manager

components/terminal/runtime/serialLocalEcho.ts

@@ -0,0 +1,25 @@
+function normalizeSerialLocalEchoLineEndings(data: string): string {
+  let output = "";
+  for (let i = 0; i < data.length; i += 1) {
+    const ch = data[i];
+    if (ch === "\r") {
+      output += "\r\n";
+      if (data[i + 1] === "\n") i += 1;
+    } else if (ch === "\n") {
+      output += "\r\n";
+    } else {
+      output += ch;
+    }
+  }
+  return output;
+}
+
+export function formatSerialLocalEcho(data: string): string {
+  if (!data) return "";
+  if (data === "\x7f" || data === "\b") return "\b \b";
+  if (data === "\x03") return "^C";
+  if (data === "\r" || data === "\n" || data.charCodeAt(0) >= 32 || data.length > 1) {
+    return normalizeSerialLocalEchoLineEndings(data);
+  }
+  return "";
+}