implement zsh (partially)

react/resume/src/emulator/zsh.js

@@ -8,21 +8,44 @@ let terminal;
 
 const prompt = '\033[1;32muser@blek.codes \033[36m~ $ \033[0m';
 let cmd = '';
+let history = [];
+let history_pos = 0;
+
+function text_prompt() {
+    return prompt.replace(/[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]/g, '');
+}
 
 function pr_char(char) {
     cmd += char;
     terminal.write(char);
+    // console.log(char.charCodeAt(0));
+    if (history_pos != 0) history_pos = 0;
 }
 
 function exec_cmd() {
     let c = cmd;
     reset_cmd();
+    history.push(c);
     terminal.writeln('zsh: command not found: ' + c);
     print_prompt();
 }
 
 function print_prompt() {
     terminal.write(prompt);
+    history_pos = 0;
+}
+
+function reprint_prompt() {
+    terminal.write('\033[2K\r');
+    print_prompt();
+}
+
+function history_up() {
+    if (history_pos != history.length) {
+        reprint_prompt();
+        terminal.write(history[history_pos]);
+        history_pos++;
+    }
 }
 
 function reset_cmd() {
@@ -36,7 +59,7 @@ function control_char(char) {
 
         // backspace
         case 127:
-            if (terminal.buffer.active.cursorX == prompt.length) break;
+            if (terminal.buffer.active.cursorX <= text_prompt().length) break;
             terminal.write('\b \b');
             cmd = cmd.substring(0, cmd.length - 1);
             break;
@@ -53,6 +76,11 @@ function control_char(char) {
             print_prompt();
             break;
 
+        // history up
+        case 27:
+            history_up();
+            break;
+
         default:
             console.log('Unknown special char: ' + id);
             break;