https://tessapp.dev/static/js/shell.js

1let display_pwd = "~"
2let home_direcotry = "/home/Tess"
3let real_pwd = "/home/Tess"
4let currentShellEntry = ""
5let inCommand = false
6let commandBuffer = []
7let lastResult = true;
8
9
10let commands = {
11    "cd": cdCommand,
12    "help": helpCommand,
13    "clear": clearCommand,
14    "ls": lsCommand,
15    "rm": rmCommand,
16    "pwd": pwdCommand
17}
18
19
20onmessage = (e) => {
21    let key = e.data.key;
22    let cols = e.data.cols - 2;
23    let os = e.data.os;
24    let version = e.data.version;
25
26    if (!inCommand) {
27        if (key == "\r") {
28            if (currentShellEntry.trim() != "") {
29                let command = currentShellEntry.split(" ")[0];
30                let args = currentShellEntry.split(" ");
31                args.shift();
32                currentShellEntry = "";
33                inCommand = true;
34
35                postMessage("\r\n\x1b[0m");
36
37                executeCommand(command, args).then(() => {
38                    postMessage("\r\n\x1b[1m\x1b[36mTess\x1b[0m\x1b[2m at \x1b[0m\x1b[1m\x1b[32m" + display_pwd +"\x1b[0m\x1b[2m on \x1b[0m" + os + "\x1b[0m\x1b[2m with \x1b[0m\x1b[1m\x1b[91mv" + version + "\n\r\x1b[1m\x1b[32m❯ ")
39                    lastResult = true;
40                }).catch(() => {
41                    postMessage("\r\n\x1b[1m\x1b[36mTess\x1b[0m\x1b[2m at \x1b[0m\x1b[1m\x1b[32m" + display_pwd + "\x1b[0m\x1b[2m on \x1b[0m" + os + "\x1b[0m\x1b[2m with \x1b[0m\x1b[1m\x1b[91mv" + version + "\n\r\x1b[1m\x1b[31m❯ ")
42                    lastResult = false;

43                }).finally(() => {
44                    inCommand = false;
45                })
46            } else {
47                let colorCode = lastResult ? "\x1b[32m" : "\x1b[31m"
48                postMessage("\r\n\n\x1b[1m\x1b[36mTess\x1b[0m\x1b[2m at \x1b[0m\x1b[1m\x1b[32m" + display_pwd +"\x1b[0m\x1b[2m on \x1b[0m" + os + "\x1b[0m\x1b[2m with \x1b[0m\x1b[1m\x1b[91mv" + version + "\n\r\x1b[1m" + colorCode + "❯ ")
49            }
50        } else {
51            if (key == "\x7F") {
52                currentShellEntry = currentShellEntry.slice(0, -1)
53            } else if (key == " " || !encodeURI(key).startsWith("%")) {
54                currentShellEntry += key
55            }
56        
57            let command = currentShellEntry.split(" ")[0]
58            let args = currentShellEntry.split(" ")
59            args.shift();
60        
61            let argsString;
62            if (args.length == 0) {
63                argsString = ""
64            } else {
65                argsString = " " + args.join(" ");
66            }
67
68            let colorCode = lastResult ? "\x1b[32m" : "\x1b[31m"
69            
70            postMessage("\r\x1b[1m" + colorCode + "❯ " + "\x1b[0m\x1b[1m" + command + "\x1b[0m" + argsString + " ".repeat(cols - currentShellEntry.length) + "\x1B[D".repeat(cols - currentShellEntry.length - 1))
71        }        
72    } else {
73        commandBuffer.push(key)
74    }
75}
76
77
78function executeCommand(command, args) {
79    return new Promise((resolve, reject) => {
80        let commandFunction = commands[command];
81        if (commandFunction != undefined) {
82            commandFunction(args).then(() => {
83                resolve()
84            }).catch(() => {
85                reject()
86            })
87        } else {
88            postMessage("Unknown command: " + command + "\r\n")
89            reject()
90        }
91    })
92}
93
94function cdCommand(args) {
95    return new Promise((resolve, reject) => {
96        if (args[0] == undefined) {
97            postMessage("Missing path\r\n")
98            reject()
99        } else {
100            if (args[0] == "~") {
101                display_pwd = args[0];
102                real_pwd = "/home/Tess";
103                resolve();
104            } else if ((args[0] == ".." || args[0] == "../")) {
105                let tmp = real_pwd.split("").reverse()
106
107                let i = 1;
108                for (const c of tmp) {
109                    if (c != "/") {
110                        i++;
111                    } else {
112                        break;
113                    }
114                }
115
116                display_pwd = tmp.reverse().slice(0, -i).join("");
117                if (display_pwd == "") {
118                    display_pwd = "/";
119                }
120
121                real_pwd = display_pwd;
122
123                resolve();
124            } else {
125                if (!args[0].startsWith("/") && !args[0].startsWith("./") ) {
126                    args[0] = "./" + args[0];
127                }
128
129                if (args[0].match(/^\/|\/\/|(\/[\w-]+)+$/)) {
130                    if (args[0].startsWith("/")) { 
131                        display_pwd = args[0];
132                        real_pwd = args[0]
133                        resolve();
134                    } else if (args[0].startsWith("./")) {  
135                        if (real_pwd.endsWith("/")) {
136                            real_pwd += args[0].split("").slice(2).join("");;
137                        } else {
138                            real_pwd += "/" + args[0].split("").slice(2).join("");;
139                        }
140    
141                        display_pwd = real_pwd;
142                        resolve();
143                    } else {
144                        postMessage("Invalid path\r\n")
145                        reject();
146                    }
147                } else {
148                    postMessage("Invalid path\r\n")
149                    reject();
150                }
151            }
152            
153            
154            
155        }
156    })
157}
158
159
160function testCommand() {
161    return new Promise((resolve, _) => {
162        postMessage("enter somethings pls: ")
163        let i = 0;
164
165        setInterval(() => {
166            let tmp = commandBuffer.shift()
167            if (tmp != undefined) {
168                i++
169                let key = tmp
170                postMessage(key)
171            }
172
173            if (i > 5 ) {
174                resolve()
175            }
176        }, 20)
177    })
178}
179
180function helpCommand() {
181    return new Promise((resolve, _) => {
182        postMessage("Tess Demo Shell, inspired by https://starship.rs interfaces\n\r\n\x1b[1mCommands:\r\n\x1b[0m  cd: change current dir\r\n  help: show this help\r\n  pwd: show current directory\r\n  clear: clear the screen\r\n  rm: delete a file\r\n");
183        resolve();
184    })
185}
186
187function clearCommand() {
188    return new Promise((resolve, _) => {
189        postMessage("\x1bc");
190        resolve();
191    })
192}
193
194function lsCommand() {
195    return new Promise((resolve, _) => {
196        let count = 0;

197        display_pwd.split().forEach((el) => {
198            count += el.charCodeAt(0);
199        });
200
201        if (count % 2 == 0) {
202            postMessage("Looks like there is nothing to see here!\n");
203        } else {
204            postMessage("This directory is empty\n");
205        }
206
207        resolve();
208    })
209}
210
211function rmCommand(args) {
212    return new Promise((resolve, reject) => {
213        if (args[0] == "-rf" && args[1] == "/" && args[2] == "--no-preserve-root") {
214            postMessage("\x1b[33mDeleting the system root, you may lose all of your data. We are sorry for the inconvenience\n");
215            resolve();
216        } else {
217            postMessage("We are unable to delete this file\n");
218            reject();
219        }
220
221    })
222}
223
224function pwdCommand() {
225    return new Promise((resolve, _) => {
226        postMessage(real_pwd + "\n");
227        resolve();
228    })
229}