Add link applet

src/cmd/clear/mod.rs

@@ -1,5 +1,5 @@
-use clap::Command;
 use super::Cmd;
+use clap::Command;
 
 #[derive(Debug, Default)]
 pub struct Clear;

src/cmd/groups/mod.rs

@@ -30,12 +30,8 @@ impl Cmd for Groups {
             return Err(Box::new(io::Error::new(io::ErrorKind::Other, "no input")))
         };
         let groups = match matches.get_one::<String>("user") {
-            Some(u) => {
-                pw::get_group_names_for_name(&u)?
-            },
-            None => {
-                pw::get_group_names()?
-            },
+            Some(u) => pw::get_group_names_for_name(&u)?,
+            None => pw::get_group_names()?,
         };
         let len = groups.len();
         for (idx, group) in groups.into_iter().enumerate() {

src/cmd/link/mod.rs

@@ -0,0 +1,60 @@
+use super::Cmd;
+use clap::{Arg, ArgAction, Command};
+use std::{fs, io};
+
+#[derive(Debug, Default)]
+pub struct Link;
+
+impl Cmd for Link {
+    fn name(&self) -> &str {
+        "link"
+    }
+
+    fn cli(&self) -> clap::Command {
+        Command::new("link")
+            .about("call the link function to create a link to a file")
+            .author("Nathan Fisher")
+            .version(env!("CARGO_PKG_VERSION"))
+            .args([
+                Arg::new("file1").required(true).index(1),
+                Arg::new("file2").required(true).index(2),
+                Arg::new("verbose")
+                    .short('v')
+                    .long("verbose")
+                    .action(ArgAction::SetTrue),
+            ])
+    }
+
+    fn run(&self, matches: Option<&clap::ArgMatches>) -> Result<(), Box<dyn std::error::Error>> {
+        let Some(matches) = matches else {
+            return Err(Box::new(io::Error::new(io::ErrorKind::Other, "no input")));
+        };
+        let f1 = match matches.get_one::<String>("file1") {
+            Some(s) => s,
+            None => {
+                return Err(Box::new(io::Error::new(
+                    io::ErrorKind::Other,
+                    "missing file 1",
+                )))
+            }
+        };
+        let f2 = match matches.get_one::<String>("file2") {
+            Some(s) => s,
+            None => {
+                return Err(Box::new(io::Error::new(
+                    io::ErrorKind::Other,
+                    "missing file 2",
+                )))
+            }
+        };
+        fs::hard_link(f1, f2)?;
+        if matches.get_flag("verbose") {
+            println!("{f2} -> {f1}");
+        }
+        Ok(())
+    }
+
+    fn path(&self) -> Option<crate::Path> {
+        Some(crate::Path::UsrBin)
+    }
+}

src/cmd/mod.rs

@@ -20,6 +20,7 @@ mod getty;
 pub mod groups;
 pub mod head;
 pub mod hostname;
+pub mod link;
 mod ln;
 mod ls;
 pub mod mountpoint;
@@ -40,9 +41,10 @@ pub mod yes;
 
 pub use {
     self::hostname::Hostname, base32::Base32, base64::Base64, basename::Basename,
-    bootstrap::Bootstrap, clear::Clear, dirname::Dirname, echo::Echo, factor::Factor, fold::Fold, groups::Groups,
-    head::Head, mountpoint::Mountpoint, nologin::Nologin, nproc::Nproc, r#false::False,
-    r#true::True, rev::Rev, shitbox::Shitbox, sleep::Sleep, which::Which, whoami::Whoami, yes::Yes,
+    bootstrap::Bootstrap, clear::Clear, dirname::Dirname, echo::Echo, factor::Factor, fold::Fold,
+    groups::Groups, head::Head, link::Link, mountpoint::Mountpoint, nologin::Nologin, nproc::Nproc,
+    r#false::False, r#true::True, rev::Rev, shitbox::Shitbox, sleep::Sleep, which::Which,
+    whoami::Whoami, yes::Yes,
 };
 
 pub trait Cmd: fmt::Debug + Sync {
@@ -66,6 +68,7 @@ pub fn get(name: &str) -> Option<Box<dyn Cmd>> {
         "fold" => Some(Box::new(Fold::default())),
         "groups" => Some(Box::new(Groups::default())),
         "head" => Some(Box::new(Head::default())),
+        "link" => Some(Box::new(Link::default())),
         "mountpoint" => Some(Box::new(Mountpoint::default())),
         "nologin" => Some(Box::new(Nologin::default())),
         "nproc" => Some(Box::new(Nproc::default())),
@@ -80,7 +83,7 @@ pub fn get(name: &str) -> Option<Box<dyn Cmd>> {
     }
 }
 
-pub static COMMANDS: [&'static str; 23] = [
+pub static COMMANDS: [&'static str; 24] = [
     "base32",
     "base64",
     "basename",
@@ -94,6 +97,7 @@ pub static COMMANDS: [&'static str; 23] = [
     "groups",
     "head",
     "hostname",
+    "link",
     "mountpoint",
     "nologin",
     "nproc",

src/pw/mod.rs

@@ -1,4 +1,8 @@
-use std::{error::Error, ffi::{CStr, CString, c_int}, num, io};
+use std::{
+    error::Error,
+    ffi::{c_int, CStr, CString},
+    io, num,
+};
 
 pub fn get_username<'a>() -> Result<&'a str, std::str::Utf8Error> {
     let user = unsafe {
@@ -88,7 +92,12 @@ pub fn get_gids() -> Result<Vec<u32>, num::TryFromIntError> {
 pub fn get_gids_for_name(name: &str) -> Result<Vec<u32>, Box<dyn Error>> {
     let gid = match get_pgid_for_name(name) {
         Some(g) => g as libc::gid_t,
-        None => return Err(Box::new(io::Error::new(io::ErrorKind::Other, "cannot get primary group"))),
+        None => {
+            return Err(Box::new(io::Error::new(
+                io::ErrorKind::Other,
+                "cannot get primary group",
+            )))
+        }
     };
     let mut buf: Vec<libc::gid_t> = vec![0; 1024];
     let name = CString::new(name.as_bytes())?;
@@ -96,7 +105,10 @@ pub fn get_gids_for_name(name: &str) -> Result<Vec<u32>, Box<dyn Error>> {
     unsafe {
         let res = libc::getgrouplist(name.as_ptr(), gid, buf.as_mut_ptr(), &mut ct);
         if res < 0 {
-            return Err(Box::new(io::Error::new(io::ErrorKind::Other, "too many groups")))
+            return Err(Box::new(io::Error::new(
+                io::ErrorKind::Other,
+                "too many groups",
+            )));
         }
     }
     Ok(buf[0..ct as usize].iter().map(|x| *x as u32).collect())