feat: make a simple nix devshell, integrated with direnv

Co-authored-by: user0-07161 <user0thenyancat@proton.me>

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1 +1,2 @@
 target
+.direnv

Cargo.lock

@@ -2,9 +2,18 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "anyhow"
+version = "1.0.99"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0674a1ddeecb70197781e945de4b3b8ffb61fa939a5597bcf48503737663100"
+
 [[package]]
 name = "boxutils"
 version = "0.1.0"
+dependencies = [
+ "anyhow",
+]
 
 [[package]]
 name = "cfg-if"
@@ -16,6 +25,7 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 name = "coreutils"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "boxutils",
  "hostname",
  "num_cpus",
@@ -58,6 +68,7 @@ dependencies = [
 name = "rebox"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "boxutils",
  "coreutils",
  "shell",
@@ -67,6 +78,7 @@ dependencies = [
 name = "shell"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "boxutils",
 ]
 

Cargo.toml

@@ -11,11 +11,13 @@ resolver = "3"
 coreutils = { path = "./coreutils" }
 boxutils = { path = "./utils" }
 shell = { path = "./shell" }
+anyhow = "1.0.99"
 
 [dependencies]
 coreutils.workspace = true
 boxutils.workspace = true
 shell.workspace = true
+anyhow.workspace = true
 
 [[bin]]
 name = "box"

coreutils/Cargo.toml

@@ -5,5 +5,8 @@ edition = "2024"
 
 [dependencies]
 boxutils.workspace = true
+anyhow.workspace = true
+
+# TODO: get rid of these
 hostname = "0.4.0"
 num_cpus = "1.16.0"

coreutils/src/commands/base32.rs

@@ -1,3 +1,4 @@
+use anyhow::{Result, bail};
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 use boxutils::encoding::base32;
@@ -11,7 +12,7 @@ use std::io::Read;
 pub struct Base32;
 
 impl Command for Base32 {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("-d") // decode flag
             .parse_args("base32");
@@ -22,7 +23,7 @@ impl Command for Base32 {
         let mut file: Box<dyn Read> = match &args.get_normal_args()[..] {
             [] => Box::new(std::io::stdin()),
             [file] => Box::new(OpenOptions::new().read(true).open(file).unwrap()),
-            _ => panic!("base32: multiple files provided"),
+            _ => bail!("base32: multiple files provided"),
         };
 
         let mut buffer = String::new();
@@ -35,5 +36,7 @@ impl Command for Base32 {
 
             println!("{}", data);
         }
+
+        Ok(())
     }
 }

coreutils/src/commands/base64.rs

@@ -1,3 +1,4 @@
+use anyhow::{Result, bail};
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 use boxutils::encoding::base64;
@@ -11,7 +12,7 @@ use std::io::Read;
 pub struct Base64;
 
 impl Command for Base64 {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("-d") // decode flag
             .parse_args("base64");
@@ -22,7 +23,7 @@ impl Command for Base64 {
         let mut file: Box<dyn Read> = match &args.get_normal_args()[..] {
             [] => Box::new(std::io::stdin()),
             [file] => Box::new(OpenOptions::new().read(true).open(file).unwrap()),
-            _ => panic!("base64: multiple files provided"),
+            _ => bail!("base64: multiple files provided"),
         };
 
         let mut buffer = String::new();
@@ -35,5 +36,7 @@ impl Command for Base64 {
 
             println!("{}", data);
         }
+
+        Ok(())
     }
 }

coreutils/src/commands/cat.rs

@@ -1,3 +1,4 @@
+use anyhow::Result;
 use boxutils::commands::Command;
 use boxutils::commands::get_args;
 use std::env;
@@ -7,9 +8,9 @@ use std::io::{self, BufReader, Read, Write};
 pub struct Cat;
 
 impl Command for Cat {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args: Vec<String> = env::args().collect::<Vec<_>>().clone();
-        let arguments: Vec<String> = get_args(String::from("cat"), args);
+        let arguments: Vec<String> = get_args("cat".to_owned(), args);
         let mut vecbuf = Vec::new();
 
         if arguments.len() == 0 {
@@ -23,6 +24,8 @@ impl Command for Cat {
             let _ = vecbuf.append(&mut tmpbuf);
         }
 
-        let _ = io::stdout().write_all(&vecbuf);
+        io::stdout().write_all(&vecbuf)?;
+
+        Ok(())
     }
 }

coreutils/src/commands/dd.rs

@@ -1,3 +1,4 @@
+use anyhow::{Result, bail};
 use boxutils::commands::Command;
 use std::collections::HashMap;
 use std::env;
@@ -8,7 +9,7 @@ use std::time::Instant;
 pub struct Dd;
 
 impl Command for Dd {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         // dd has its seperate argument parsing
         let mut arguments = HashMap::new();
         let mut blocksize = 512;
@@ -24,19 +25,18 @@ impl Command for Dd {
             let (k, v) = bs.split_at(bs.len() - 1);
             if v.parse::<u64>().is_ok() {
                 // assume the bs is specified in bytes,
-                // because the last char is a number
-                blocksize = bs.parse::<u64>().unwrap()
+                // because it can be parsed as u64
+                blocksize = bs.parse::<u64>()?
             } else {
                 match v {
-                    "K" | "k" => blocksize = k.parse::<u64>().unwrap() * 1024,
-                    "M" => blocksize = k.parse::<u64>().unwrap() * 1024 * 1024,
-                    "G" => blocksize = k.parse::<u64>().unwrap() * 1024 * 1024 * 1024,
-                    "kB" => blocksize = k.parse::<u64>().unwrap() * 1000,
-                    "MB" => blocksize = k.parse::<u64>().unwrap() * 1000 * 1000,
-                    "GB" => blocksize = k.parse::<u64>().unwrap() * 1000 * 1000 * 1000,
+                    "K" | "k" => blocksize = k.parse::<u64>()? * 1024,
+                    "M" => blocksize = k.parse::<u64>()? * 1024 * 1024,
+                    "G" => blocksize = k.parse::<u64>()? * 1024 * 1024 * 1024,
+                    "kB" => blocksize = k.parse::<u64>()? * 1000,
+                    "MB" => blocksize = k.parse::<u64>()? * 1000 * 1000,
+                    "GB" => blocksize = k.parse::<u64>()? * 1000 * 1000 * 1000,
                     _ => {
-                        eprintln!("Invalid blocksize specified.");
-                        return;
+                        bail!("Invalid blocksize specified.");
                     }
                 }
             }
@@ -46,17 +46,17 @@ impl Command for Dd {
         let start = Instant::now();
 
         if let Some(input) = arguments.get("if") {
-            let mut f = BufReader::new(File::open(input).unwrap());
-            let _ = f.read_to_end(&mut vecbuf).unwrap();
+            let mut f = BufReader::new(File::open(input)?);
+            f.read_to_end(&mut vecbuf)?;
         } else {
-            let _ = io::stdin().read_to_end(&mut vecbuf).unwrap();
+            io::stdin().read_to_end(&mut vecbuf)?;
         }
 
         if let Some(output) = arguments.get("of") {
             let buffer = File::create(output);
-            let _ = buffer.unwrap().write(&vecbuf);
+            buffer.unwrap().write(&vecbuf)?;
         } else {
-            let _ = io::stdout().write_all(&vecbuf);
+            io::stdout().write_all(&vecbuf)?;
         }
 
         let duration = start.elapsed().as_secs_f64();
@@ -77,6 +77,8 @@ impl Command for Dd {
             vecbuf.len(),
             duration,
             kb_per_sec
-        )
+        );
+
+        Ok(())
     }
 }

coreutils/src/commands/dirname.rs

@@ -1,18 +1,16 @@
-use std::path::Path;
-
+use anyhow::{Result, bail};
 use boxutils::{args::ArgParser, commands::Command};
-
+use std::path::Path;
 pub struct Dirname;
 
 impl Command for Dirname {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("--help")
             .parse_args("dirname");
 
         if args.get_normal_args().len() != 1 || args.get_flag("--help") {
-            println!("Usage: dirname FILENAME");
-            return;
+            bail!("Usage: dirname FILENAME");
         }
 
         // note(teesh): we have already checked for argnums, so we're fine :D
@@ -30,7 +28,9 @@ impl Command for Dirname {
 
             println!("{}", to_print);
         } else {
-            println!("dirname: could not get parent")
+            bail!("dirname: could not get parent")
         }
+
+        Ok(())
     }
 }

coreutils/src/commands/dos2unix.rs

@@ -1,8 +1,8 @@
+use anyhow::{Result, bail};
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 use std::fs::File;
 use std::io::{self, BufReader, Read, Write};
-use std::process::exit;
 
 pub fn convert(arguments: &ArgParser, d2u: bool) -> Vec<u8> {
     let mut vecbuf = Vec::new();
@@ -19,10 +19,7 @@ pub fn convert(arguments: &ArgParser, d2u: bool) -> Vec<u8> {
     }
 
     if d2u {
-        vecbuf.retain(
-            |x|
-            *x != b'\r'
-        );
+        vecbuf.retain(|x| *x != b'\r');
     } else {
         let mut tmpbuf = Vec::new();
         vecbuf.iter().enumerate().for_each(|(i, &b)| {
@@ -40,7 +37,7 @@ pub fn convert(arguments: &ArgParser, d2u: bool) -> Vec<u8> {
 pub struct Dos2Unix;
 
 impl Command for Dos2Unix {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("-u")
             .add_flag("-d")
@@ -58,19 +55,23 @@ impl Command for Dos2Unix {
         }
 
         if args.get_flag("--help") {
-            println!("Usage: dos2unix [-d] [-u] [FILE]");
-            print!("\n");
-            println!("-d: unix2dos");
-            println!("-u: dos2unix (default)");
-            exit(0);
+            let help_text = "\
+Usage: dos2unix [-d] [-u] [FILE]
+
+-d: unix2dos
+-u: dos2unix (default)\
+";
+            bail!("{}", help_text)
         }
 
         let result = convert(&args, dos2unix);
 
         if args.get_normal_args().len() < 1 {
-            let _ = io::stdout().write_all(&result);
+            io::stdout().write_all(&result)?;
         } else {
-            let _ = std::fs::write(args.get_normal_args()[0].clone(), &result);
+            std::fs::write(args.get_normal_args()[0].clone(), &result)?;
         }
+
+        Ok(())
     }
 }

coreutils/src/commands/echo.rs

@@ -1,12 +1,15 @@
+use anyhow::Result;
 use boxutils::commands::Command;
 
 pub struct Echo;
 
 impl Command for Echo {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args: Vec<String> = std::env::args().collect::<Vec<_>>();
         let arguments: Vec<String> = boxutils::commands::get_args(String::from("echo"), args);
         let message = &arguments.join(" ");
         println!("{}", message);
+
+        Ok(())
     }
 }

coreutils/src/commands/env.rs

@@ -1,3 +1,4 @@
+use anyhow::Result;
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 
@@ -35,7 +36,7 @@ impl Env {
 }
 
 impl Command for Env {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("-i")
             .add_flag("-0")
@@ -59,20 +60,20 @@ impl Command for Env {
         if to_run.is_empty() {
             Env::print_all_vars();
 
-            return;
+            return Ok(());
         }
 
         if let Some((command, args)) = to_run.split_first() {
             std::process::Command::new(command)
                 .args(args)
-                .spawn()
-                .expect("env: failed to start command")
-                .wait()
-                .expect("env: could not wait for command");
+                .spawn()?
+                .wait()?;
         }
 
         if null_terminate {
             print!("\0");
         }
+
+        Ok(())
     }
 }

coreutils/src/commands/false.rs

@@ -1,10 +1,11 @@
+use anyhow::Result;
 use boxutils::commands::Command;
 use std::process::exit;
 
 pub struct False;
 
 impl Command for False {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         exit(1);
     }
 }

coreutils/src/commands/hello.rs

@@ -1,9 +1,12 @@
+use anyhow::Result;
 use boxutils::commands::Command;
 
 pub struct Hello;
 
 impl Command for Hello {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         println!("Hello, world!");
+
+        Ok(())
     }
 }

coreutils/src/commands/hostname.rs

@@ -1,10 +1,11 @@
+use anyhow::Result;
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 
 pub struct Hostname;
 
 impl Command for Hostname {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("--help")
             .parse_args("hostname");
@@ -19,5 +20,7 @@ impl Command for Hostname {
         };
 
         println!("{}", hostname.to_string_lossy());
+
+        Ok(())
     }
 }

coreutils/src/commands/ln.rs

@@ -1,11 +1,11 @@
+use anyhow::{Result, bail};
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 use std::fs;
-
 pub struct Ln;
 
 impl Command for Ln {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("--help")
             .add_flag("-s")
@@ -20,7 +20,7 @@ impl Command for Ln {
         let help = args.get_normal_args().len() != 2 || args.get_flag("--help");
         if help {
             println!("Usage: ln [-sfnbtv] [-S SUF] TARGET LINK");
-            return;
+            return Ok(());
         }
 
         let to_be_linked = args.get_normal_args()[0].clone();
@@ -31,11 +31,11 @@ impl Command for Ln {
         }
 
         if args.get_flag("-f") {
-            if fs::exists(&destination).unwrap() {
-                if fs::metadata(&destination).unwrap().is_dir() {
-                    fs::remove_dir_all(&destination).unwrap();
+            if fs::exists(&destination)? {
+                if fs::metadata(&destination)?.is_dir() {
+                    fs::remove_dir_all(&destination)?;
                 } else {
-                    fs::remove_file(&destination).unwrap();
+                    fs::remove_file(&destination)?;
                 }
             }
         }
@@ -47,19 +47,22 @@ impl Command for Ln {
         if args.get_flag("-b") {
             let suffix = args.get_option("-S").unwrap_or("~");
             let new_filename = format!("{}{}", destination, suffix);
-            let _ = fs::rename(&destination, &new_filename);
+            fs::rename(&destination, &new_filename)?;
         }
 
         if args.get_flag("-s") {
-            let symlink_result = boxutils::cross::fs::symlink(to_be_linked, destination, dereference);
+            let symlink_result =
+                boxutils::cross::fs::symlink(to_be_linked, destination, dereference);
 
             if let Err(e) = symlink_result {
-                eprintln!("ln: failed to create symlink: {}", e);
+                bail!("ln: failed to create symlink: {}", e);
             }
         } else {
             if let Err(e) = boxutils::cross::fs::hard_link(to_be_linked, destination, dereference) {
-                eprintln!("ln: failed to create hard link: {}", e);
+                bail!("ln: failed to create hard link: {}", e);
             }
         }
+
+        Ok(())
     }
 }

coreutils/src/commands/mkdir.rs

@@ -1,3 +1,4 @@
+use anyhow::{Result, bail};
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 use std::fs;
@@ -5,7 +6,7 @@ use std::fs;
 pub struct Mkdir;
 
 impl Command for Mkdir {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("-p")
             .add_flag("--parents")
@@ -14,11 +15,11 @@ impl Command for Mkdir {
 
         if args.get_flag("--help") {
             println!("Usage: mkdir [DIR1] [DIR2] etc. pp. [-p, --parents]");
-            return;
+            return Ok(());
         }
 
         if args.get_normal_args().len() == 0 {
-            panic!("Usage: mkdir [DIR1] [DIR1] etc. pp. [-p, --parents]");
+            bail!("Usage: mkdir [DIR1] [DIR1] etc. pp. [-p, --parents]");
         }
 
         let parented = args.get_flag("-p") || args.get_flag("--parents");
@@ -27,10 +28,12 @@ impl Command for Mkdir {
 
         for dir in to_create {
             if parented {
-                let _ = fs::create_dir_all(dir);
+                fs::create_dir_all(dir)?;
             } else {
-                let _ = fs::create_dir(dir);
+                fs::create_dir(dir)?;
             }
         }
+
+        Ok(())
     }
 }

coreutils/src/commands/nproc.rs

@@ -1,3 +1,4 @@
+use anyhow::Result;
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 use num_cpus::get;
@@ -5,7 +6,7 @@ use num_cpus::get;
 pub struct Nproc;
 
 impl Command for Nproc {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("--help")
             .add_flag("--ignore")
@@ -23,7 +24,7 @@ Prints the number of available CPUs to stdout.
     --ignore=N, --ignore N  Ignore N CPUs
 "
             );
-            return;
+            return Ok(());
         }
 
         if args.get_flag("--all") {
@@ -31,13 +32,13 @@ Prints the number of available CPUs to stdout.
         }
 
         if args.get_flag("--ignore") {
-            ignore = args.get_option("--ignore").unwrap().parse().unwrap();
+            ignore = args.get_option("--ignore").unwrap().parse()?;
         }
 
         for argument in args.get_normal_args() {
             if let Some((k, v)) = argument.split_once('=') {
                 if k == "--ignore" {
-                    ignore = v.parse().unwrap();
+                    ignore = v.parse()?;
                 }
             }
         }
@@ -47,5 +48,7 @@ Prints the number of available CPUs to stdout.
         } else {
             println!("{}", get() as u64 - ignore)
         }
+
+        Ok(())
     }
 }

coreutils/src/commands/pwd.rs

@@ -1,18 +1,21 @@
+use anyhow::Result;
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 
 pub struct Pwd;
 
 impl Command for Pwd {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder().add_flag("--help").parse_args("yes");
 
         if args.get_flag("--help") {
             println!("Usage: pwd");
-            return;
+            return Ok(());
         }
 
-        let pwd = std::env::current_dir().unwrap();
+        let pwd = std::env::current_dir()?;
         println!("{}", pwd.display());
+
+        Ok(())
     }
 }

coreutils/src/commands/seq.rs

@@ -1,9 +1,10 @@
+use anyhow::{Result, bail};
 use boxutils::{args::ArgParser, commands::Command};
 
 pub struct Seq;
 
 impl Command for Seq {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_option("-s")
             .add_flag("-w")
@@ -31,7 +32,7 @@ impl Command for Seq {
                 incnum = inc.parse().expect("seq: invalid inc number");
                 lastnum = last.parse().expect("seq: invalid last number");
             }
-            _ => panic!("seq: malformed arguments"),
+            _ => bail!("seq: malformed arguments"),
         }
 
         let mut accumulator = firstnum;
@@ -62,5 +63,7 @@ impl Command for Seq {
                 print!("{}", separator);
             }
         }
+
+        Ok(())
     }
 }

coreutils/src/commands/sleep.rs

@@ -1,15 +1,16 @@
+use anyhow::{Result, bail};
 use boxutils::{args::ArgParser, commands::Command};
 
 pub struct Sleep;
 
 impl Command for Sleep {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder().parse_args("sleep");
         let mut sleep_for = 0;
 
         for arg in args.get_normal_args() {
             if arg.chars().last().unwrap().is_numeric() {
-                sleep_for += arg.parse::<i32>().unwrap();
+                sleep_for += arg.parse::<i32>()?;
             } else {
                 let multiplier = match arg.chars().last().unwrap() {
                     's' => 1,
@@ -17,20 +18,21 @@ impl Command for Sleep {
                     'h' => 3600,
                     'd' => 86400,
                     _ => {
-                        println!("Invalid time interval '{}'", arg);
-                        return;
+                        bail!("Invalid time interval '{}'", arg);
                     }
                 };
 
-                sleep_for += arg[..arg.len() - 1].parse::<i32>().unwrap() * multiplier;
+                sleep_for += arg[..arg.len() - 1].parse::<i32>()? * multiplier;
             }
         }
 
         if sleep_for == 0 {
             println!("Usage: sleep [N]...");
-            return;
+            return Ok(());
         }
 
         std::thread::sleep(std::time::Duration::from_secs(sleep_for as u64));
+
+        Ok(())
     }
 }

coreutils/src/commands/tee.rs

@@ -1,3 +1,4 @@
+use anyhow::{Result, bail};
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 use std::fs::OpenOptions;
@@ -10,7 +11,7 @@ use std::io::Write;
 pub struct Tee;
 
 impl Command for Tee {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("--help")
             .add_flag("-a")
@@ -34,17 +35,19 @@ impl Command for Tee {
             if let Ok(this_file) = this_file {
                 writes.push(Box::new(this_file));
             } else {
-                eprintln!("tee: unable to open file: {}", file);
+                bail!("tee: unable to open file: {}", file);
             }
         }
 
         let mut buffer = String::new();
         while boxutils::input::repl(&mut buffer) {
             for output in &mut writes {
-                let _ = output.write_all(buffer.as_bytes());
-                let _ = output.flush();
+                output.write_all(buffer.as_bytes())?;
+                output.flush()?;
             }
             buffer.clear();
         }
+
+        Ok(())
     }
 }

coreutils/src/commands/test.rs

@@ -1,3 +1,4 @@
+use anyhow::{Result, bail};
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 
@@ -194,7 +195,7 @@ impl Test {
 }
 
 impl Command for Test {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flags(STRING_TESTS.into())
             .add_flags(NUMBER_TESTS.into())
@@ -202,7 +203,7 @@ impl Command for Test {
             .parse_args(if self.bracket { "[" } else { "test" });
 
         if self.bracket && !args.get_flag("]") {
-            panic!("[: missing ]");
+            bail!("[: missing ]");
         }
 
         if STRING_TESTS.iter().any(|&x| args.get_flag(x)) {
@@ -214,5 +215,6 @@ impl Command for Test {
         }
 
         exit_false();
+        unreachable!();
     }
 }

coreutils/src/commands/true.rs

@@ -1,10 +1,11 @@
+use anyhow::Result;
 use boxutils::commands::Command;
 use std::process::exit;
 
 pub struct True;
 
 impl Command for True {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         exit(0);
     }
 }

coreutils/src/commands/unix2dos.rs

@@ -1,4 +1,5 @@
 use crate::commands::dos2unix::convert;
+use anyhow::Result;
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 use std::io::{self, Write};
@@ -7,7 +8,7 @@ use std::process::exit;
 pub struct Unix2Dos;
 
 impl Command for Unix2Dos {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder()
             .add_flag("-u")
             .add_flag("-d")
@@ -35,10 +36,11 @@ impl Command for Unix2Dos {
         let result = convert(&args, dos2unix);
 
         if args.get_normal_args().len() < 1 {
-            let _ = io::stdout().write_all(&result);
+            io::stdout().write_all(&result)?;
         } else {
-            let _ = std::fs::write(args.get_normal_args()[0].clone(), &result);
+            std::fs::write(args.get_normal_args()[0].clone(), &result)?;
         }
 
+        Ok(())
     }
 }

coreutils/src/commands/whoami.rs

@@ -1,3 +1,4 @@
+use anyhow::Result;
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 use boxutils::cross::user;
@@ -5,16 +6,18 @@ use boxutils::cross::user;
 pub struct WhoAmI;
 
 impl Command for WhoAmI {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder().add_flag("--help").parse_args("whoami");
 
         if args.get_flag("--help") {
             println!("Usage: whoami");
-            return;
+            return Ok(());
         }
 
-        let username = user::get_username().unwrap_or_else(|| "unknown".to_string());
+        let username = user::get_username().unwrap_or("unknown".to_string());
 
         println!("{}", username);
+
+        Ok(())
     }
 }

coreutils/src/commands/yes.rs

@@ -1,15 +1,16 @@
+use anyhow::Result;
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 
 pub struct Yes;
 
 impl Command for Yes {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let args = ArgParser::builder().add_flag("--help").parse_args("yes");
 
         if args.get_flag("--help") {
             println!("Usage: yes [STRING]");
-            return;
+            return Ok(());
         }
 
         let string = if args.get_normal_args().is_empty() {

flake.lock

@@ -0,0 +1,77 @@
+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1769996383,
+        "narHash": "sha256-AnYjnFWgS49RlqX7LrC4uA+sCCDBj0Ry/WOJ5XWAsa0=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "57928607ea566b5db3ad13af0e57e921e6b12381",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "import-tree": {
+      "locked": {
+        "lastModified": 1763762820,
+        "narHash": "sha256-ZvYKbFib3AEwiNMLsejb/CWs/OL/srFQ8AogkebEPF0=",
+        "owner": "vic",
+        "repo": "import-tree",
+        "rev": "3c23749d8013ec6daa1d7255057590e9ca726646",
+        "type": "github"
+      },
+      "original": {
+        "owner": "vic",
+        "repo": "import-tree",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1770197578,
+        "narHash": "sha256-AYqlWrX09+HvGs8zM6ebZ1pwUqjkfpnv8mewYwAo+iM=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "00c21e4c93d963c50d4c0c89bfa84ed6e0694df2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1769909678,
+        "narHash": "sha256-cBEymOf4/o3FD5AZnzC3J9hLbiZ+QDT/KDuyHXVJOpM=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "72716169fe93074c333e8d0173151350670b824c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "import-tree": "import-tree",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,13 @@
+{
+  description = "rebox: remaking busybox with rust";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    import-tree.url = "github:vic/import-tree";
+  };
+
+  outputs = inputs:
+    inputs.flake-parts.lib.mkFlake {inherit inputs;}
+    (inputs.import-tree ./packages/nix);
+}

packages/nix/shell.nix

@@ -0,0 +1,7 @@
+{...}: {
+  perSystem = {pkgs, ...}: {
+    devShells.default = pkgs.mkShell {
+      packages = [pkgs.cargo];
+    };
+  };
+}

packages/nix/systems.nix

@@ -0,0 +1,5 @@
+{...}: {
+  systems = [
+    "x86_64-linux"
+  ];
+}

shell/Cargo.toml

@@ -5,3 +5,4 @@ edition = "2024"
 
 [dependencies]
 boxutils.workspace = true
+anyhow.workspace = true

shell/src/ash.rs

@@ -1,14 +1,17 @@
 use boxutils::commands::Command;
+
 use std::env;
 use std::io::{self, Write};
 use std::process;
 
+use anyhow::{Error, Result};
+
 use crate::built_in::{Action, run_if_exists};
 
 pub struct Ash;
 
 impl Command for Ash {
-    fn execute(&self) {
+    fn execute(&self) -> Result<(), Error> {
         let mut path = env::current_dir().unwrap().display().to_string();
 
         loop {
@@ -20,13 +23,13 @@ impl Command for Ash {
             print!("{} {} ", path.clone(), userchar);
             let _ = io::stdout().flush();
             let mut input = String::new();
-            io::stdin().read_line(&mut input).unwrap();
+            io::stdin().read_line(&mut input)?;
             let mut full_cmd = input.trim().split_whitespace();
-            let command = full_cmd.next().unwrap_or(" ");
+            let command = full_cmd.next().unwrap_or("");
             let arguments: Vec<&str> = full_cmd.collect();
 
             if let Some(action) = run_if_exists(command.to_string(), arguments.clone()) {
-                match action {
+                match action? {
                     Action::Exit => {
                         break;
                     }
@@ -39,17 +42,13 @@ impl Command for Ash {
                     Action::Nothing => {}
                 }
             } else {
-                let out = process::Command::new(command)
+                process::Command::new(command)
                     .args(arguments.clone())
-                    .spawn();
-
-                match out {
-                    Ok(mut out) => {
-                        let _ = out.wait();
-                    }
-                    Err(err) => println!("{:?}", err),
-                }
+                    .spawn()?
+                    .wait()?;
             }
         }
+
+        Ok(())
     }
 }

shell/src/built_in/cd.rs

@@ -1,9 +1,10 @@
 use crate::built_in::Action;
+use anyhow::{Result, bail};
 
-pub fn cd(arguments: Vec<&str>) -> Action {
+pub fn cd(arguments: Vec<&str>) -> Result<Action> {
     if arguments.len() < 1 {
-        panic!("cd expects **one** argument");
+        bail!("cd expects **one** argument");
     }
 
-    Action::ChangeDirectory(arguments[0].to_owned().clone())
+    Ok(Action::ChangeDirectory(arguments[0].to_owned().clone()))
 }

shell/src/built_in/eval.rs

@@ -1,17 +1,16 @@
 use crate::built_in::Action;
+use anyhow::{Result, bail};
 use std::process::Command;
 
-pub fn eval(arguments: Vec<&str>) -> Action {
+pub fn eval(arguments: Vec<&str>) -> Result<Action> {
     if arguments.len() < 1 {
-        panic!("eval expects **one or more** arguments");
+        bail!("eval expects **one or more** arguments");
     }
 
-    let output = Command::new(arguments[0]).args(&arguments[1..]).spawn();
-    match output {
-        Ok(mut output) => {
-            output.wait().expect("failed to wait for process exit");
-        }
-        Err(err) => println!("{:?}", err)
-    }
-    Action::Nothing
-}
+    Command::new(arguments[0])
+        .args(&arguments[1..])
+        .spawn()?
+        .wait()?;
+    Ok(Action::Nothing)
+}
+

shell/src/built_in/exit.rs

@@ -1,5 +1,6 @@
 use crate::built_in::Action;
+use anyhow::Result;
 
-pub fn exit(_: Vec<&str>) -> Action {
-    Action::Exit
+pub fn exit(_: Vec<&str>) -> Result<Action> {
+    Ok(Action::Exit)
 }

shell/src/built_in/mod.rs

@@ -1,21 +1,23 @@
 mod cd;
-mod exit;
 mod eval;
+mod exit;
+
+use anyhow::Result;
 
 #[derive(Debug)]
 pub enum Action {
     Exit,
     ChangeDirectory(String),
-    Nothing
+    Nothing,
 }
 
-fn get_function(command: String) -> Option<fn(Vec<&str>) -> Action> {
+fn get_function(command: String) -> Option<fn(Vec<&str>) -> Result<Action>> {
     let registry = [
-        ("exit", exit::exit as fn(Vec<&str>) -> Action),
-        ("cd", cd::cd as fn(Vec<&str>) -> Action),
-        ("eval", eval::eval as fn(Vec<&str>) -> Action)
+        ("exit", exit::exit as fn(Vec<&str>) -> Result<Action>),
+        ("cd", cd::cd as fn(Vec<&str>) -> Result<Action>),
+        ("eval", eval::eval as fn(Vec<&str>) -> Result<Action>),
     ];
-    let mut function: Option<fn(Vec<&str>) -> Action> = None;
+    let mut function: Option<fn(Vec<&str>) -> Result<Action>> = None;
 
     for entry in registry {
         if entry.0 == &command {
@@ -26,7 +28,7 @@ fn get_function(command: String) -> Option<fn(Vec<&str>) -> Action> {
     function
 }
 
-pub fn run_if_exists(command: String, arguments: Vec<&str>) -> Option<Action> {
+pub fn run_if_exists(command: String, arguments: Vec<&str>) -> Option<Result<Action>> {
     let function = get_function(command);
     if let Some(function) = function {
         let action = function(arguments);

src/boxcmd.rs

@@ -1,11 +1,12 @@
 use super::registry::get_registry;
+use anyhow::{Result, bail};
 use boxutils::args::ArgParser;
 use boxutils::commands::Command;
 
 pub struct Boxcmd;
 
 impl Command for Boxcmd {
-    fn execute(&self) {
+    fn execute(&self) -> Result<()> {
         let parser = ArgParser::builder().parse_args("box");
 
         let registry = get_registry();
@@ -15,11 +16,10 @@ impl Command for Boxcmd {
                 continue;
             }
 
-            registry.execute(&command);
-            return;
+            registry.execute(&command)?;
         }
 
-        println!(
+        bail!(
             "No valid command provided. Included commands:\n{}",
             registry.list().join(", ")
         );

src/main.rs

@@ -1,9 +1,12 @@
 mod boxcmd;
 mod registry;
 
+use anyhow::{Error, Result};
 use boxutils::commands::being_called_as;
 
-fn main() {
+fn main() -> Result<(), Error> {
     let utility_name = being_called_as();
-    registry::get_registry().execute(&utility_name);
+    registry::get_registry().execute(&utility_name)?;
+
+    Ok(())
 }

utils/Cargo.toml

@@ -4,3 +4,4 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+anyhow.workspace = true

utils/src/commands.rs

@@ -2,6 +2,8 @@ use std::env;
 use std::mem;
 use std::path::Path;
 
+use anyhow::{Error, Result};
+
 pub fn being_called_as() -> String {
     let args = env::args().collect::<Vec<String>>();
     let exe_path = args[0].clone();
@@ -34,5 +36,5 @@ pub fn get_args(commandname: String, args: Vec<String>) -> Vec<String> {
 }
 
 pub trait Command {
-    fn execute(&self);
+    fn execute(&self) -> Result<(), Error>;
 }

utils/src/registry.rs

@@ -1,6 +1,8 @@
 use super::commands::Command;
 use std::collections::HashMap;
 
+use anyhow::{Error, Result, bail};
+
 pub struct CommandRegistry {
     commands: HashMap<String, Box<dyn Command>>,
 }
@@ -28,23 +30,31 @@ impl CommandRegistry {
         self.commands.get(name)
     }
 
-    pub fn execute(&self, name: &str) {
+    pub fn execute(&self, name: &str) -> Result<(), Error> {
         if let Some(command) = self.get(name) {
-            command.execute();
+            command.execute()?;
         } else {
-            println!("Command not found: {}", name);
+            bail!("Command not found: {}", name);
         }
+
+        Ok(())
     }
 }
 
 mod tests {
+    #[allow(unused_imports)] // why the heck is rust saying it's unused??
+    use anyhow::{Error, Result};
+
     #[test]
     fn test_register() {
         use super::Command;
         use super::CommandRegistry;
+
         struct TestCommand;
         impl Command for TestCommand {
-            fn execute(&self) {}
+            fn execute(&self) -> Result<(), Error> {
+                Ok(())
+            }
         }
 
         let mut registry = CommandRegistry::new();
@@ -53,18 +63,23 @@ mod tests {
     }
 
     #[test]
-    fn test_execute() {
+    fn test_execute() -> Result<(), Error> {
         use super::Command;
         use super::CommandRegistry;
+
         struct TestCommand;
         impl Command for TestCommand {
-            fn execute(&self) {
+            fn execute(&self) -> Result<(), Error> {
                 println!("TestCommand executed");
+
+                Ok(())
             }
         }
 
         let mut registry = CommandRegistry::new();
         registry.register("test", Box::new(TestCommand));
-        registry.execute("test");
+        registry.execute("test")?;
+
+        Ok(())
     }
 }