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old.html
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<!DOCTYPE html>
<html>
<head>
<title>web console</title>
<!--
<link rel="stylesheet" href="css/xterm.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/xterm/3.14.5/xterm.min.js"></script>
-->
<link rel="stylesheet" href="node_modules/xterm/css/xterm.css" />
<script src="node_modules/xterm/lib/xterm.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/xterm/3.14.5/xterm.min.js"></script>
<!-- Favicons -->
<link href="img/m.png" rel="icon" />
<link href="img/m.png" rel="apple-touch-icon" />
</head>
<body>
<div id="terminal"></div>
<script>
var term = new Terminal({
cursorBlink: "block"
});
const ws = new WebSocket("ws://localhost:3000");
var curr_line = "";
var entries = [];
var currPos = 0;
var pos = 0;
term.open(document.getElementById("terminal"));
term.prompt = () => {
console.log("onpropm caled");
if (curr_line) {
let data = { method: "command", command: curr_line };
ws.send(JSON.stringify(data));
}
term.write("\n\r" + curr_line + "\r\n\u001b[32mscm> \u001b[37m");
};
term.write("Welcome to my Scheme web intepreter!");
term.prompt();
ws.onmessage = msg => {
term.write("\n\r" + JSON.parse(msg.data).data);
};
term.on("key", function(key, ev) {
const printable =
!ev.altKey &&
!ev.altGraphKey &&
!ev.ctrlKey &&
!ev.metaKey &&
!(ev.keyCode === 37 && term.buffer.cursorX < 6);
if (ev.keyCode === 13) {
// Enter key
if (curr_line.replace(/^\s+|\s+$/g, "").length != 0) {
// Check if string is all whitespace
entries.push(curr_line);
currPos = entries.length - 1;
term.prompt();
} else {
term.write("\n\33[2K\r\u001b[32mscm> \u001b[37m");
}
curr_line = "";
} else if (ev.keyCode === 8) {
// Backspace
if (term.buffer.cursorX > 5) {
curr_line =
curr_line.slice(0, term.buffer.cursorX - 6) +
curr_line.slice(term.buffer.cursorX - 5);
pos = curr_line.length - term.buffer.cursorX + 6;
term.write("\33[2K\r\u001b[32mscm> \u001b[37m" + curr_line);
term.write("\033[".concat(pos.toString()).concat("D")); //term.write('\033[<N>D');
if (
term.buffer.cursorX == 5 ||
term.buffer.cursorX == curr_line.length + 6
) {
term.write("\033[1C");
}
}
} else if (ev.keyCode === 38) {
// Up arrow
if (entries.length > 0) {
if (currPos > 0) {
currPos -= 1;
}
curr_line = entries[currPos];
term.write("\33[2K\r\u001b[32mscm> \u001b[37m" + curr_line);
}
} else if (ev.keyCode === 40) {
// Down arrow
currPos += 1;
if (currPos === entries.length || entries.length === 0) {
currPos -= 1;
curr_line = "";
term.write("\33[2K\r\u001b[32mscm> \u001b[37m");
} else {
curr_line = entries[currPos];
term.write("\33[2K\r\u001b[32mscm> \u001b[37m" + curr_line);
}
} else if (
printable &&
!(ev.keyCode === 39 && term.buffer.cursorX > curr_line.length + 4)
) {
if (ev.keyCode != 37 && ev.keyCode != 39) {
var input = ev.key;
if (ev.keyCode == 9) {
// Tab
input = " ";
}
pos = curr_line.length - term.buffer.cursorX + 4;
curr_line = [
curr_line.slice(0, term.buffer.cursorX - 5),
input,
curr_line.slice(term.buffer.cursorX - 5)
].join("");
term.write("\33[2K\r\u001b[32mscm> \u001b[37m" + curr_line);
term.write("\033[".concat(pos.toString()).concat("D")); //term.write('\033[<N>D');
} else {
term.write(key);
}
}
});
term.on("paste", function(data) {
curr_line += data;
term.write(curr_line);
});
</script>
</body>
</html>