add rm command

src/emulator/commands/index.js

@@ -12,6 +12,7 @@ let cmds = {
     'zsh': require('./zsh'),
     'ps': require('./ps'),
     'clear': require('./clear'),
+    'rm': require('./rm'),
 
     // alias l='ls -l'
     'l': (a,t) => {require('./ls')([...a, '-l'], t)},

src/emulator/commands/rm.js

@@ -0,0 +1,57 @@
+const { Terminal } = require("xterm");
+const fs = require('../fs')
+
+/**
+ * 
+ * @param {string[]} argv 
+ * @param {Terminal} terminal 
+ */
+module.exports = (argv, terminal) => {
+    if (argv.indexOf('--help') != -1) {
+        terminal.write(
+`Usage: ${argv[0]} [...FILES] [OPTIONS]
+Delete specified flies
+    -r -R --recursive   Recursively delete all files in directory
+    -f --force          Ignore nonexistant files and arguments
+`
+        );
+        return;
+    }
+
+    let files = [...argv];
+    files.shift();
+    files = files.filter(file => !file.startsWith('-'));
+
+    let args = [...argv].filter(arg => arg.startsWith('-'));
+
+    // explode -abc => -a -b -c
+    args.forEach((arg, i) => {
+        if (arg.match(/-\w{2,}/)) {
+            args.splice(i, 1);
+            arg.substring(1).split('').forEach(part => args.push('-' + part));
+        }
+    })
+
+    const recursive = args.indexOf('-r') != -1;
+    const force     = args.indexOf('-f') != -1;
+
+    files.forEach(file => {
+        try {
+            const stat = fs.lstatSync(file);
+
+            if (stat.isDirectory()) {
+                if (!recursive) {
+                    if (!force)
+                        terminal.writeln(`${argv[0]}: cannot remove ${file}: is a directory`);
+                    return -1;
+                }
+                fs.readdirSync(file).forEach(file => fs.unlinkSync(file));
+                fs.rmdirSync(file);
+            }
+            fs.unlinkSync(file);
+        } catch (err) {
+            if (!force)
+                terminal.writeln(`${argv[0]}: cannot remove ${file}: ${err}`);
+        }
+    });
+}