command_sequence : autorisation temporaire de code mort pour la fonction add encore inutilisée

src/command/builtin.rs

@@ -0,0 +1,63 @@
+use super::Command;
+use crate::{error::print_error, exit_code::ExitCode};
+
+use std::env;
+use std::{env::set_current_dir, path::PathBuf};
+
+type BuiltinFunction = fn(&Vec<String>) -> ExitCode;
+
+pub struct Builtin {
+    function: BuiltinFunction,
+    args: Vec<String>,
+}
+
+impl Builtin {
+    pub fn new(argv: &Vec<String>) -> Result<Self, NoSuchBuiltinError> {
+        let mut args = argv.clone();
+        let program = args.remove(0);
+
+        if program == "cd" {
+            Ok(Self { function: cd, args })
+        } else {
+            Err(NoSuchBuiltinError)
+        }
+    }
+}
+
+impl Command for Builtin {
+    fn spawn(&mut self) -> ExitCode {
+        (self.function)(&self.args)
+    }
+}
+
+#[derive(Debug)]
+pub struct NoSuchBuiltinError;
+
+fn cd(args: &Vec<String>) -> ExitCode {
+    let path: Option<PathBuf>;
+
+    if !args.is_empty() {
+        path = Some(PathBuf::from(&args[0]));
+    } else {
+        path = match env::var("HOME") {
+            Ok(var) => Some(PathBuf::from(var)),
+            Err(_e) => None,
+        };
+    }
+
+    let exit_code: ExitCode;
+    if path.is_some() {
+        exit_code = match set_current_dir(path.unwrap()) {
+            Ok(()) => ExitCode::success(),
+            Err(_e) => ExitCode::new(2),
+        };
+    } else {
+        exit_code = ExitCode::success();
+    }
+
+    if exit_code.get() != 0 {
+        print_error("lol");
+    }
+
+    exit_code
+}

src/command/command_builder.rs

@@ -0,0 +1,31 @@
+use super::builtin::Builtin;
+use super::unix_program::UnixProgram;
+use super::Command;
+
+pub struct CommandBuilder {
+    argv: Vec<String>,
+}
+
+impl CommandBuilder {
+    pub fn new() -> Self {
+        Self { argv: Vec::new() }
+    }
+
+    pub fn argv(&mut self, argv: Vec<String>) -> &Self {
+        self.argv = argv;
+        self
+    }
+
+    pub fn build(&self) -> Box<dyn Command> {
+        let builtin = Builtin::new(&self.argv);
+        let command: Box<dyn Command>;
+
+        if builtin.is_err() {
+            command = Box::from(UnixProgram::new(&self.argv));
+        } else {
+            command = Box::from(builtin.unwrap());
+        }
+
+        command
+    }
+}

src/command/command_sequence.rs

@@ -7,16 +7,17 @@ pub struct CommandSequence {
 }
 
 impl CommandSequence {
-    pub fn new(command: impl Command + 'static) -> Self {
+    pub fn new(command: Box<dyn Command>) -> Self {
         Self {
-            command: Box::new(command),
+            command,
             next_command: None,
         }
     }
 
-    pub fn add(&mut self, command: impl Command + 'static) {
+    #[allow(dead_code)]
+    pub fn add(&mut self, command: Box<dyn Command>) {
         if self.next_command.is_none() {
-            self.next_command = Some(Box::new(CommandSequence::new(command)));
+            self.next_command = Some(Box::new(Self::new(command)));
         } else {
             self.next_command.as_mut().unwrap().add(command);
         }

src/command/mod.rs

@@ -1,3 +1,5 @@
+pub mod builtin;
+pub mod command_builder;
 pub mod command_sequence;
 pub mod unix_program;
 

src/command/unix_program.rs

@@ -7,7 +7,8 @@ pub struct UnixProgram {
 }
 
 impl UnixProgram {
-    pub fn new(mut argv: Vec<String>) -> Self {
+    pub fn new(argv: &Vec<String>) -> Self {
+        let mut argv = argv.clone();
         let program = argv.remove(0);
         let mut command = std::process::Command::new(&program);
         command.args(argv);
@@ -39,7 +40,7 @@ impl Command for UnixProgram {
                 "{}: command not found",
                 self.command.get_program().to_str().unwrap()
             );
-            print_error(message);
+            print_error(message.as_str());
             ExitCode::not_found()
         }
     }

src/error.rs

@@ -1,6 +1,6 @@
 use std::path::Path;
 
-pub fn print_error(message: String) {
+pub fn print_error(message: &str) {
     let name = std::env::args().next().unwrap();
     let name = Path::new(&name).file_name().unwrap().to_str().unwrap();
 

src/exit_code.rs

@@ -14,4 +14,8 @@ impl ExitCode {
     pub fn not_found() -> Self {
         Self { exit_code: 127 }
     }
+
+    pub fn success() -> Self {
+        Self { exit_code: 0 }
+    }
 }

src/parser.rs

@@ -1,14 +1,12 @@
+use crate::command::command_builder::CommandBuilder;
 use crate::command::command_sequence::CommandSequence;
-use crate::command::unix_program::UnixProgram;
 
 pub fn parse_command_line(line: String) -> Option<CommandSequence> {
     let argv: Vec<String> = line.split_whitespace().map(|s| s.to_string()).collect();
 
     if !argv.is_empty() {
-        let command = UnixProgram::new(argv);
-        let command_sequence = CommandSequence::new(command);
-
-        Some(command_sequence)
+        let command = CommandBuilder::new().argv(argv).build();
+        Some(CommandSequence::new(command))
     } else {
         None
     }