Add `logname` applet

README.md

@@ -21,6 +21,7 @@ code between applets, making for an overall smaller binary.
 - base64
 - basename
 - bootstrap
+- chgrp
 - chmod
 - chown
 - clear
@@ -35,9 +36,12 @@ code between applets, making for an overall smaller binary.
 - hostname
 - link
 - mkfifo
+- mknod
 - mountpoint
 - nologin
 - nproc
+- printenv
+- pwd
 - rev
 - rm
 - rmdir

src/cmd/logname/mod.rs

@@ -0,0 +1,27 @@
+use std::ffi::CStr;
+
+use super::Cmd;
+use clap::Command;
+
+#[derive(Debug, Default)]
+pub struct Logname;
+
+impl Cmd for Logname {
+    fn cli(&self) -> clap::Command {
+        Command::new("logname")
+            .about("print user's login name")
+            .author("Nathan Fisher")
+            .version(env!("CARGO_PKG_VERSION"))
+    }
+
+    fn run(&self, _matches: Option<&clap::ArgMatches>) -> Result<(), Box<dyn std::error::Error>> {
+        let logname = unsafe { CStr::from_ptr(libc::getlogin()) };
+        let logname = logname.to_str()?;
+        println!("{logname}");
+        Ok(())
+    }
+
+    fn path(&self) -> Option<crate::Path> {
+        Some(crate::Path::UsrBin)
+    }
+}

src/cmd/mod.rs

@@ -24,6 +24,7 @@ mod head;
 mod hostname;
 mod link;
 mod ln;
+mod logname;
 mod ls;
 mod mkfifo;
 mod mknod;
@@ -81,6 +82,7 @@ pub fn get(name: &str) -> Option<Box<dyn Cmd>> {
         "groups" => Some(Box::new(groups::Groups::default())),
         "head" => Some(Box::new(head::Head::default())),
         "link" => Some(Box::new(link::Link::default())),
+        "logname" => Some(Box::new(logname::Logname::default())),
         "mkfifo" => Some(Box::new(mkfifo::MkFifo::default())),
         "mknod" => Some(Box::new(mknod::MkNod::default())),
         "mountpoint" => Some(Box::new(mountpoint::Mountpoint::default())),
@@ -103,13 +105,13 @@ pub fn get(name: &str) -> Option<Box<dyn Cmd>> {
     }
 }
 
-pub static COMMANDS: [&str; 36] = [
+pub static COMMANDS: [&str; 37] = [
     "base32",
     "base64",
     "basename",
     "bootstrap",
-    "chmod",
     "chgrp",
+    "chmod",
     "chown",
     "clear",
     "cut",
@@ -122,6 +124,7 @@ pub static COMMANDS: [&str; 36] = [
     "head",
     "hostname",
     "link",
+    "logname",
     "mkfifo",
     "mknod",
     "mountpoint",