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fix: Adds (slightly broken) fixed backspace support.

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This commit is contained in:
greysoh 2024-05-06 15:46:35 -04:00
parent e447c0f9e1
commit 0e60efceee
Signed by: imterah
GPG key ID: 8FA7DD57BA6CEA37
1 changed files with 31 additions and 5 deletions
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36
lom/src/index.ts
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@ -19,6 +19,10 @@ const axios = baseAxios.create({
async function readFromKeyboard(stream: ssh2.ServerChannel, disableEcho: boolean = false): Promise<string> {
const leftEscape = "\x1B[D";
const rightEscape = "\x1B[C";
const ourBackspace = "\u0008";
// \x7F = Ascii escape code for backspace (client side)
let line = "";
let lineIndex = 0;
@ -34,10 +38,28 @@ async function readFromKeyboard(stream: ssh2.ServerChannel, disableEcho: boolean
return;
} else if (readStreamData.includes("\x7F")) {
// \x7F = Ascii escape code for backspace (client side)
// \u0008 = Ascii escape code for backspace (server side)
line = line.substring(0, line.length - 1);
if (!disableEcho) stream.write("\u0008 \u0008");
// TODO (greysoh): investigate maybe potential deltaCursor overflow (haven't tested)
// TODO (greysoh): investigate deltaCursor underflow
// TODO (greysoh): make it not run like shit (I don't know how to describe it)
if (line.length == 0) return setTimeout(eventLoop, 5); // Here because if we do it in the parent if statement, shit breaks
line = line.substring(0, lineIndex - 1) + line.substring(lineIndex);
if (!disableEcho) {
let deltaCursor = line.length - lineIndex;
// wtf?
if (deltaCursor < 0) {
console.log("FIXME: somehow, our deltaCursor value is negative! please investigate me");
return setTimeout(eventLoop, 5);
}
// Jump forward to the front, and remove the last character
stream.write(rightEscape.repeat(deltaCursor) + " " + ourBackspace);
// Go backwards & rerender text & go backwards again (wtf?)
stream.write(leftEscape.repeat(deltaCursor + 1) + line.substring(lineIndex - 1) + leftEscape.repeat(deltaCursor + 1));
}
} else if (readStreamData.includes("\x1B")) {
if (readStreamData.includes(rightEscape)) {
if (lineIndex + 1 > line.length) return setTimeout(eventLoop, 5);
@ -151,7 +173,11 @@ server.on("connection", client => {
const line = await readFromKeyboard(stream);
stream.write("\r\n");
if (line == "") continue;
if (line == "") {
stream.write(`~$ `);
continue;
}
const argv = parseArgsStringToArgv(line);
if (argv[0] == "exit") {