From 378b052412e22f112c72e5adb79f89e7db316ecd Mon Sep 17 00:00:00 2001
From: "Felix W. Dekker" <felix@fwdekker.com>
Date: Sat, 26 Oct 2019 16:08:46 +0200
Subject: [PATCH] Add whoami

Fixes #7
---
 js/commands.ts | 14 ++++++++++++++
 js/terminal.ts | 49 +++++++++++++++++++++++++++++++++++++++----------
 2 files changed, 53 insertions(+), 10 deletions(-)

diff --git a/js/commands.ts b/js/commands.ts
index 81d5d1c..309a38e 100644
--- a/js/commands.ts
+++ b/js/commands.ts
@@ -129,6 +129,12 @@ export class Commands {
                 `Update the access and modification times of each FILE to the current time.
                     
                 If a file does not exist, it is created.`.trimLines()
+            ),
+            whoami: new Command(
+                this.whoami,
+                `print short description of user`,
+                `whoami`,
+                `Print a description of the user associated with the current effective user ID.`
             )
         };
     }
@@ -276,6 +282,14 @@ export class Commands {
     private touch(args: InputArgs): string {
         return this.fileSystem.createFiles(args.args);
     }
+
+    private whoami(): string {
+        const user = this.terminal.currentUser;
+        if (user === undefined)
+            throw "Cannot execute `whoami` while not logged in.";
+
+        return user.description;
+    }
 }
 
 
diff --git a/js/terminal.ts b/js/terminal.ts
index 77752d3..5d303a0 100644
--- a/js/terminal.ts
+++ b/js/terminal.ts
@@ -13,7 +13,8 @@ export class Terminal {
     private readonly fileSystem: FileSystem;
     private readonly commands: Commands;
 
-    private _currentUser: string | undefined;
+    private readonly users: User[];
+    private _currentUser: User | undefined;
     private isLoggedIn: boolean;
 
 
@@ -23,7 +24,13 @@ export class Terminal {
         this.output = output;
         this.prefixDiv = prefixDiv;
 
-        this._currentUser = "felix";
+        this.users = [
+            new User("felix", "password", "Why are you logged in on <i>my</i> account?"),
+            new User("root", "root", "Wait how did you get here?")
+        ];
+        this._currentUser = this.users.find(it => it.name === "felix");
+        if (this._currentUser === undefined)
+            throw "Could not find user `felix`.";
         this.isLoggedIn = true;
 
         this.inputHistory = new InputHistory();
@@ -64,7 +71,7 @@ export class Terminal {
         this.prefixDiv.innerHTML = prefixText;
     }
 
-    get currentUser(): string | undefined {
+    get currentUser(): User | undefined {
         return this._currentUser;
     }
 
@@ -87,10 +94,13 @@ export class Terminal {
             if (this._currentUser === undefined)
                 return "login as: ";
             else
-                return `Password for ${this._currentUser}@fwdekker.com: `;
+                return `Password for ${this._currentUser.name}@fwdekker.com: `;
         }
 
-        return `${this._currentUser}@fwdekker.com <span style="color: green;">${this.fileSystem.pwd}</span>&gt; `;
+        if (this._currentUser === undefined)
+            throw "User is logged in as undefined.";
+
+        return `${this._currentUser.name}@fwdekker.com <span style="color: green;">${this.fileSystem.pwd}</span>&gt; `;
     }
 
 
@@ -107,16 +117,22 @@ export class Terminal {
 
 
     private continueLogin(input: string) {
-        if (this._currentUser === undefined) {
-            this.outputText += `${this.prefixText}${input}\n`;
+        if (this.isLoggedIn)
+            throw "`continueLogin` is called while user is already logged in.";
+
+        const user = this._currentUser;
+        if (user === undefined) {
+            this.outputText += `${this.prefixText}${input.trim()}\n`;
+
+            this._currentUser = this.users.find(it => it.name === input.trim());
+            if (this._currentUser === undefined)
+                this._currentUser = new User(input.trim(), "temp", "temp");
 
-            this._currentUser = input.trim();
             this.input.classList.add("terminalCurrentFocusInputHidden");
         } else {
             this.outputText += `${this.prefixText}\n`;
 
-            if ((this._currentUser === "felix" && input === "password")
-                || (this._currentUser === "root" && input === "root")) {
+            if (this.users.find(it => it.name === user.name) && input === user.password) {
                 this.isLoggedIn = true;
                 this.outputText += Terminal.generateHeader();
             } else {
@@ -242,6 +258,19 @@ class InputHistory {
     }
 }
 
+class User {
+    readonly name: string;
+    readonly password: string;
+    readonly description: string;
+
+
+    constructor(name: string, password: string, description: string) {
+        this.name = name;
+        this.password = password;
+        this.description = description;
+    }
+}
+
 
 export let terminal: Terminal;