add set env and fix error

Author: zhangzijie-pro

README.md

@@ -33,10 +33,12 @@
 - 支持文件和目录的移动，通过 `mv` 命令进行操作。
 - 提供文件压缩和解压功能，通过 `tar` 命令进行操作。
 - 支持退出当前进程，通过 `exit` 命令进行操作。
+- 支持&用于优先级执行，&&顺序执行,|管道符与 >重定向输出
 
 ## 使用方法
 
 Tiks 提供了类似于常见 Linux 终端的使用方法，下面是一些常用命令的示例：
+详见[命令](./command/src/commands/command.rs)
 
 ```bash
 Usage: <command> [options] [arg]
@@ -58,6 +60,7 @@ Commands:
     tar -zxvf:  解压缩文件
     tar -xvf:   压缩文件
     exit        退出当前进程
+    ......
 ```
 
 # Rust 安装工具

command/src/commands/arg.rs

@@ -150,6 +150,7 @@ pub fn execute_command(command: &str, option: &str, arg: &Vec<String>, session_c
 // match has arg's function
 pub fn execute_other_command(command: &str, option: &str, arg: &[String]) -> Result<(usize,String), std::io::Error> {
     match command {
+        "help" => Ok((0,help())),
         "pwd" => pwd(),
         "time" => get_time(),
         "history" => history(),
@@ -232,10 +233,6 @@ pub fn split(commands: Commands) -> (String,String,Vec<String>){
     (command,option,arg)
 }
 
-// ["cat", "README.md", ">", "a.txt"]
-
-//command: ["cat", "README.md"]
-//file: a.txt
 pub fn stdout_other(arg: &Vec<String>) -> (String,Commands){
     let mut s = arg.split(|s| s==">");
     let output = s.next().unwrap().to_vec();

command/src/commands/command.rs

@@ -23,7 +23,7 @@ pub fn whoami(session_context: &mut SessionContext) -> io::Result<(usize,String)
 pub fn help() -> String{
     let help = format!(
     "Usage: <command> [options] [arg]
-\0\x1B[32mCommands:
+\0\x1B[32m Commands:
     pwd     View current directory                         apt -i ..   Install package
     ls      View all files in the current directory        history     View past Commands
     cd      Change directory                               whoami  ||  apt -update version
@@ -313,7 +313,7 @@ use crate::commands::download::{download_package, find_package};
 use crate::priority::get_priority;
 use crate::set::set::file_create_time;
 use crate::run::run;
-use crate::state_code::{empty_dir, empty_file, missing_pattern, STATUE_CODE};
+use crate::state_code::{empty_dir, empty_file, env, missing_pattern, STATUE_CODE};
 use super::download::update;
 use crate::root::SessionContext;
 
@@ -571,6 +571,30 @@ fn get_env(id: String) -> String{
     }
 }
 
+use std::path::PathBuf;
+fn set_env_command(key: &str, path: &str) -> io::Result<()>{
+    let mut path_set = Vec::new();
+    let s = PathBuf::from(format!("{}",path));
+
+    path_set.push(s);
+
+    let new_path = env::join_paths(path_set).expect("Failed join paths");
+
+    env::set_var(key, new_path);
+    Ok(())
+}
+
+pub fn set(key: &str, path: &str) -> io::Result<(usize,String)>{
+    match set_env_command(key, path){
+        Ok(())=>{
+            return Ok(env());
+        },
+        Err(_) =>{
+            let error_str = format!("Can't set env {}",key);
+            return Ok((108,error_str));
+        }
+    }
+}
 
 pub fn echo_print<T: std::fmt::Display + From<String>>(output: T) -> (usize,T){
     let var = format!("{}", output);