[Init] Initial commit - NetMesh terminal manager

components/terminal/runtime/serialLineInput.ts

@@ -0,0 +1,86 @@
+type StringRef = {
+  current: string;
+};
+
+type SerialLineModeInputOptions = {
+  bufferRef: StringRef;
+  localEcho?: boolean;
+  writeToSession: (data: string) => void;
+  writeToTerminal: (data: string) => void;
+};
+
+const submitLine = ({
+  bufferRef,
+  localEcho,
+  writeToSession,
+  writeToTerminal,
+}: SerialLineModeInputOptions) => {
+  const line = `${bufferRef.current}\r`;
+  writeToSession(line);
+  bufferRef.current = "";
+  if (localEcho) writeToTerminal("\r\n");
+};
+
+const appendText = (
+  text: string,
+  { bufferRef, localEcho, writeToTerminal }: SerialLineModeInputOptions,
+) => {
+  if (!text) return;
+  bufferRef.current += text;
+  if (localEcho) writeToTerminal(text);
+};
+
+const clearLine = ({
+  bufferRef,
+  localEcho,
+  writeToTerminal,
+}: SerialLineModeInputOptions) => {
+  if (localEcho && bufferRef.current.length > 0) {
+    writeToTerminal("\b \b".repeat(bufferRef.current.length));
+  }
+  bufferRef.current = "";
+};
+
+export function handleSerialLineModeInput(
+  data: string,
+  options: SerialLineModeInputOptions,
+): void {
+  if (data === "\r" || data === "\n") {
+    submitLine(options);
+    return;
+  }
+
+  if (data === "\x7f" || data === "\b") {
+    if (options.bufferRef.current.length > 0) {
+      options.bufferRef.current = options.bufferRef.current.slice(0, -1);
+      if (options.localEcho) options.writeToTerminal("\b \b");
+    }
+    return;
+  }
+
+  if (data === "\x03") {
+    options.bufferRef.current = "";
+    options.writeToSession(data);
+    if (options.localEcho) options.writeToTerminal("^C\r\n");
+    return;
+  }
+
+  if (data === "\x15") {
+    clearLine(options);
+    return;
+  }
+
+  const normalizedData = data.replace(/\r\n/g, "\r").replace(/\n/g, "\r");
+  if (normalizedData.includes("\r")) {
+    const parts = normalizedData.split("\r");
+    parts.forEach((part, index) => {
+      appendText(part, options);
+      if (index < parts.length - 1) submitLine(options);
+    });
+    return;
+  }
+
+  if (data.charCodeAt(0) >= 32 || data.length > 1) {
+    appendText(data, options);
+  }
+}