fix html terminal to support linebreaks inside lines

00_Common/javascript/WebTerminal/HtmlTerminal.js

@@ -96,9 +96,18 @@ class HtmlTerminal {
       this.#inputCallback = undefined;
     } else if (e.keyCode === 8 /* BACKSPACE */) {
       this.#$prompt.innerText = this.#$prompt.innerText.slice(0, -1);
+    } else if (
+      e.keyCode == 16 // "Shift"
+      || e.keyCode == 17 // "Control"
+      || e.keyCode == 20 // "CapsLock"
+      || !e.key.match(/^[a-z0-9!"§#$%&'()*+,.\/:;<=>?@\[\] ^_`{|}~-]$/i)
+    ) {
+      // ignore non-visible characters
+      return e;
     } else {
       this.#$prompt.innerHtml = '';
-      this.#$prompt.innerText =  this.#$prompt.innerText + e.key;
+      const key = e.shiftKey ? e.key.toUpperCase() : e.key;
+      this.#$prompt.innerText =  this.#$prompt.innerText + key;
     }
   }
 
@@ -135,27 +144,23 @@ class HtmlTerminal {
    * @param {string} text 
    */
   write(text) {
-    if (text.match(/^\n*$/)) {
-      // empty new line
-      text.match(/\n/g).forEach(() => {
-        const $br = document.createElement("br");
-        this.$output.appendChild($br);
-      });
-    } else if (text && text.length && text.includes("\n")) {
+    if (!text || text.length <= 0) {
+      // empty line
+      this.$output.appendChild(document.createElement("br"));
+    } else if (text.endsWith("\n")) {
+      // single line with linebrank
+      const $lineNode = this.#newLine(text);
+      this.$output.appendChild(this.#newLine(text));
+      this.$output.appendChild(document.createElement("br"));
+    } else if (text.includes("\n")) {
+      // multible lines
       const lines = text.split("\n");
       lines.forEach((line) => {
-        if (line.length === 0 || line.match(/^\s*$/)) {
-          this.$output.appendChild(document.createElement("br"));
-        } else {
-          const $lineNode = this.#newLine(line);
-          this.$output.appendChild($lineNode);
-          //this.$node.appendChild(document.createElement("br"));
-        }
+        this.write(line);
       });
-    } else if (text && text.length) {
-      // simple line
-      const $lineNode = this.#newLine(text);
-      this.$output.appendChild($lineNode);
+    } else {
+      // single line
+      this.$output.appendChild(this.#newLine(text));
     }
 
     // scroll to the buttom of the page

00_Common/javascript/WebTerminal/terminal_tests.mjs

@@ -3,21 +3,21 @@
 import { print, println, tab, input } from '../common.mjs';
 
 async function main() {
-  println(tab(20), "Minimal node.js terminal 2");
-  println("");
+  println(tab(30), "Minimal node.js terminal emulator");
+  println();
   println(tab(0), "tab 0");
   println(tab(5), "tab 5");
   println(tab(10), "tab 10");
   println(tab(15), "tab 15");
   println(tab(20), "tab 20");
   println(tab(25), "tab 25");
-  println("");
-  println("1234567890", " ",  "ABCDEFGHIJKLMNOPRSTUVWXYZ");
-  println("");
+  println();
+  println("1234567890", " _ ", "ABCDEFGHIJKLMNOPRSTUVWXYZ");
+  println();
   print("\nHallo"); print(" "); print("Welt!\n");
   println("");
-  print("Line 1\nLine 2\nLine 3\nLine 4");
-  println("");
+  println("Line 1\nLine 2\nLine 3\nLine 4");
+  println("----------------------------------------------");
 
   const value = await input("input");
   println(`input value was "${value}"`);

00_Common/javascript/common.mjs

@@ -1,21 +1,67 @@
-
+/**
+ * Print multible strings to the terminal.
+ * Strings get concatinated (add together) without any space betweent them.
+ * There will be no newline at the end!
+ * If you want a linebrak at the end use `println`.
+ * 
+ * This function is normally used if you want to put something on the screen 
+ * and later add some content to the same line.
+ * For normal output (similar to `console.log`) use `println`!
+ * 
+ * @param  {...string} messages - the strings to print to the terminal.
+ */
 export function print(...messages) {
-    process.stdout.write(messages.join(""));
+	process.stdout.write(messages.join(""));
 }
 
+/**
+ * Add multible strings as a new line to the terminal.
+ * Strings get concatinated (add together) without any space betweent them.
+ * There will be a newline at the end!
+ * If you want the terminal to stay active on the current line use `print`.
+ * 
+ * @param  {...any} messages - the strings to print to the terminal.
+ */
 export function println(...messages) {
-    process.stdout.write(messages.join("") + "\n");
+	process.stdout.write(messages.join("") + "\n");
 }
 
-export function tab(count) {
-    return " ".repeat(count);
+/**
+ * Create an empty string with a given length
+ * 
+ * @param {number} length - the length of the string in space-characters.
+ * @returns {string} returns a string containing only ampty spaces with a length of `count`.
+ */
+export function tab(length) {
+	return " ".repeat(length);
 }
 
-export async function input(message = "") {
-    process.stdout.write(message + ' ');
-    return new Promise(resolve => {
-        process.stdin.on('data', (input) => {
-            resolve(input.toString().replace('\n', ''));
-        });
-    });
+/**
+ * Read input from the keyboard and return it as a string.
+ * TODO: to would be very helpfull to only allow a certain class of input (numbers, letters)
+ * TODO: also we could convert all inputs to uppercase (where it makes sence).
+ * 
+ * @param {string=''} message - a message or question to print befor the input.
+ * @returns {Promise<string>} - returns the entered text as a string
+ * @async 
+ */
+export async function input(message = '') {
+	/* First we need to print the mesage
+	 * We append a space by default to seperate the message from the imput.
+	 * TODO: If the message already contains a space at the end this is not needed! */
+	process.stdout.write(message + ' ');
+	
+	return new Promise(resolve => {
+		process.stdin.on('data', (input) => {
+			/* onData returns a Buffer.
+			 * First we need to convert it into a string. */
+			const data = input.toString();
+
+			/* The result fo onData is a string ending with an `\n`.
+			 * We just need the actual content so let's remove the newline at the end: */
+			const content = data[data.length] === '\n' ? data.slice(0, -1) : data;
+
+			resolve(content);
+		});
+	});
 }