src/main.rs

@@ -1,62 +1,83 @@
 #![feature(iter_intersperse)]
-use std::io::{BufRead, Write};
+#![feature(trait_alias)]
+use std::{
+    fs,
+    io::{BufRead, Write},
+    path::Path,
+    process::{self},
+};
 
 fn main() {
-
     let stdin = std::io::stdin();
     let mut in_lock = stdin.lock();
 
     let stdout = std::io::stdout();
     let mut out_lock = stdout.lock();
 
-    loop {
+    let commands = &Command::commands();
+    println!("Loaded {} commands", commands.len());
 
+    loop {
         let mut buf = String::new();
 
         let ps1 = "> ".as_bytes();
         out_lock.write(ps1).unwrap();
         out_lock.flush().unwrap();
 
-        in_lock.read_line(&mut buf).expect("Failed to read in to buffer.");
+        in_lock
-        let trim = buf.trim();
+            .read_line(&mut buf)
+            .expect("Failed to read in to buffer.");
 
-        if let Some(choice) = Command::choose(trim, &commands()) {
+        let mut args: Param = &buf.trim().split(' ').collect::<Vec<&str>>();
-            let words = trim.split(' ').collect::<Vec<&str>>();
+        let mut options = commands;
-            choice.call(words);
+
+        loop {
+
+            match args.get(0) {
+                Some(cmd_arg) => {
+                    // Try to find a subcommand to run
+                    match Command::choose(cmd_arg, options) {
+                        Some(choice) => {
+                            if choice.sub_commands.is_empty() {
+                                // No sub commands left to choose from, just pass the input
+                                choice.call(&args);
+                                break;
+                            } else {
+                                args = &args[1..];
+                                options = &choice.sub_commands;
+
+                                // a sort of last chance before running into hella edgecases
+                                if args.is_empty() {
+                                    choice.call(args);
+                                    break;
+                                }
+                            }
+                        }
+                        // When no good choice presents it's self
+                        None => break,
+                    }
+                }
+                None => todo!("Couldn't get index 0 of the args"),
+            }
         }
     }
 }
 
+type Param<'a, 'b> = &'b [&'a str];
+trait Run = Fn(Param);
+type Cmd = Box<dyn Run>;
 
-fn commands() -> Vec<Command> {
-
-    let commands = vec![
-        Command::init("ls", vec![], nil),
-        Command::init("exit", vec![], |_| {
-            std::process::exit(0);
-        }),
-        Command::init("echo", vec![], |f| {
-            let msg = &f[1..].iter().map(|s| s.to_owned()).intersperse(" ").collect::<String>();
-            println!("{msg}");
-        }),
-    ];
-
-    commands
-}
-
-type Param<'a> = Vec<&'a str>;
-type Run = fn(Param) -> ();
-fn nil(_: Param) {}
-
-#[derive(Debug)]
 struct Command {
     name: String,
     sub_commands: Vec<Command>,
-    cmd: Run,
+    cmd: Cmd,
 }
 
 impl Command {
-    fn init(name: &str, sub_commands: Vec<Command>, f: Run) -> Self {
+    fn init<T>(name: T, sub_commands: Vec<Self>, f: Cmd) -> Self
+    where
+        T: ToString,
+    {
         Self {
             name: name.to_string(),
             sub_commands,
@@ -65,40 +86,157 @@ impl Command {
     }
 
     fn call(&self, words: Param) {
-        let x = self.cmd;
+        let x = &self.cmd;
         x(words)
     }
 
-    fn choose<'a>(text: &str, choices: &'a Vec<Command>) -> Option<&'a Command> {
+    fn choose<'a>(text: &str, choices: &'a Vec<Self>) -> Option<&'a Self> {
+        // TODO there seems to be duplicates in here?
 
         // See what command the user is trying to call
         // iter thru all the commands
         let mut ranked = choices.iter().fold(Vec::new(), |mut v, cmd| {
             // count how many chars match from the command to the word
-            let matches = text.chars().zip(cmd.name.chars()).fold(0, |mut f, (word, cmd)| {
+            let matches = text
-                if word == cmd { f += 1; }
+                .chars()
-                f
+                .zip(cmd.name.chars())
-            });
+                .fold(0, |mut f, (word, cmd)| {
+                    if word == cmd {
+                        f += 1;
+                    }
+                    f
+                });
             v.push((cmd, matches));
             v
         });
 
         // sort by most matches
-        ranked.sort_by(|a,b| b.1.cmp(&a.1));
+        ranked.sort_by(|a, b| b.1.cmp(&a.1));
+
+        // Don't select commands just because they are first. The command also has to have a
+        // confidence of at least 1
+        if let Some(first) = ranked.first() {
+            if first.1 < 1 {
+                return None;
+            }
+        }
+
+        // TODO test when 1 100% match exists
 
         if ranked.len() > 1 {
             // If the top two command choices are ranked the same, we don't know which to choose!
-            if ranked[0].1 == ranked[1].1 {
+            let top = ranked[0];
+            let second = ranked[1];
+            if top.1 == second.1 {
+                println!("Ambigous command '{text}'. Could be any of: ");
+                let iter: Vec<&(&Command, usize)> = ranked
+                    .iter()
+                    // We only care about 100% matches
+                    .filter(|f| f.1 >= text.len())
+                    .collect();
+
+                let max_display = if 5 < iter.len() {5} else {iter.len()};
+
+                iter[..max_display].iter().for_each(|matching| {
+                        println!("\t- {}", matching.0.name);
+                    });
+
+                if iter.len() > max_display {
+                    println!("\tOmitting {} other entries.", iter.len() - max_display);
+                }
+
                 return None;
             }
         }
 
         if let Some((cmd, _)) = ranked.first() {
-            // let words = text.split(' ').collect::<Vec<&str>>();
-
             return Some(cmd);
         }
         None
     }
-}
 
+    fn commands() -> Vec<Self> {
+        let path = Path::new("/bin");
+        let res = fs::read_dir(path).expect("Failed to read /bin");
+
+        // load all the programs from /bin
+        let bin = res.fold(Vec::new(), |mut v, contents| {
+            if let Ok(cmd) = contents {
+                if let Ok(t) = cmd.file_type() {
+                    if t.is_file() {
+                        // v.push(cmd.path());
+                        let cmd = Command::init(
+                            cmd.file_name().into_string().unwrap(),
+                            vec![],
+                            Box::new(move |args| {
+                                let name = cmd.path().to_str().unwrap().to_owned();
+                                let out = process::Command::new(name)
+                                    .args(args)
+                                    .output()
+                                    .expect("Failed to call external program");
+                                // FIXME not printing to out
+                                let y = out.stdout.iter().map(|b| *b as char).collect::<String>();
+                                // TODO load into env
+                                // let status = out.status.code();
+                                println!("{y}");
+                            }),
+                        );
+                        v.push(cmd);
+                    }
+                };
+            };
+            v
+        });
+
+        // load custom programs
+        let mut commands = vec![
+            Command::init(
+                "exit",
+                vec![],
+                Box::new(|_| {
+                    std::process::exit(0);
+                }),
+            ),
+            Command::init(
+                "custom_echo",
+                vec![],
+                Box::new(|args| {
+                    let msg = &args[1..]
+                        .iter()
+                        .map(|s| s.to_owned())
+                        .intersperse(" ")
+                        .collect::<String>();
+                    println!("{msg}");
+                }),
+            ),
+            Command::init(
+                "random",
+                vec![
+                    Command::init(
+                        "number",
+                        vec![],
+                        Box::new(|_| {
+                            // how do you know it's not random?
+                            println!("8");
+                        }),
+                    ),
+                    Command::init(
+                        "string",
+                        vec![],
+                        Box::new(|_| {
+                            // how do you know it's not random?
+                            println!("hello world");
+                        }),
+                    ),
+                ],
+                Box::new(|args| {
+                    println!("random's debug: {:?}", args);
+                }),
+            ),
+        ];
+
+        // combine with a move
+        commands.extend(bin);
+        commands
+    }
+}