w: Format time and get cmdline

This change allows w to display time in a similar way to the original
procps w. Additionally, w now fetches the cmdline for each entry.

Cargo.toml

@@ -47,6 +47,7 @@ xattr = "1.3.1"
 tempfile = "3.9.0"
 rand = { version = "0.8", features = ["small_rng"] }
 bytesize = "1.3.0"
+time = { version = "0.3", features = ["formatting"] }
 
 [workspace.'cfg(any(target_os = "linux", target_os = "android"))'.dependencies]
 utmpx = "0.1"
@@ -75,6 +76,7 @@ tempfile = { workspace = true }
 libc = { workspace = true }
 rand = { workspace = true }
 uucore = { workspace = true, features = ["entries", "process", "signals"] }
+time = { workspace = true, features = ["formatting"] }
 
 [target.'cfg(unix)'.dev-dependencies]
 xattr = { workspace = true }

src/uu/w/Cargo.toml

@@ -14,6 +14,7 @@ categories = ["command-line-utilities"]
 [dependencies]
 uucore = { workspace = true, features = ["utmpx"] }
 clap = { workspace = true }
+time = { workspace = true, features = ["formatting"] }
 
 ['cfg(any(target_os = "linux", target_os = "android"))'.dependencies]
 utmpx = { workspace = true }

src/uu/w/src/w.rs

@@ -5,7 +5,8 @@
 
 use clap::crate_version;
 use clap::{Arg, ArgAction, Command};
-use std::process;
+use std::{fs, path::Path, process};
+use time;
 use uucore::utmpx::Utmpx;
 use uucore::{error::UResult, format_usage, help_about, help_usage};
 
@@ -22,18 +23,28 @@ struct UserInfo {
     command: String,
 }
 
+fn format_time(time: time::OffsetDateTime) -> Result<String, time::error::Format> {
+    let time_format = time::format_description::parse("[hour]:[minute]").unwrap();
+    time.format(&time_format)
+}
+
+fn fetch_cmdline(pid: i32) -> Result<String, std::io::Error> {
+    let cmdline_path = Path::new("/proc").join(pid.to_string()).join("cmdline");
+    fs::read_to_string(cmdline_path)
+}
+
 fn fetch_user_info() -> Result<Vec<UserInfo>, std::io::Error> {
     let mut user_info_list = Vec::new();
     for entry in Utmpx::iter_all_records() {
         if entry.is_user_process() {
             let user_info = UserInfo {
                 user: entry.user(),
                 terminal: entry.tty_device(),
-                login_time: format!("{}", entry.login_time()), // Needs formatting
+                login_time: format_time(entry.login_time()).unwrap_or_default(),
                 idle_time: String::new(), // Placeholder, needs actual implementation
                 jcpu: String::new(),      // Placeholder, needs actual implementation
                 pcpu: String::new(),      // Placeholder, needs actual implementation
-                command: String::new(),   // Placeholder, needs actual implementation
+                command: fetch_cmdline(entry.pid()).unwrap_or_default(),
             };
             user_info_list.push(user_info);
         }
@@ -50,7 +61,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     match fetch_user_info() {
         Ok(user_info) => {
             if !no_header {
-                println!("USER\tTTY\t\tLOGIN@\t\tIDLE\tJCPU\tPCPU\tWHAT");
+                println!("USER\tTTY\tLOGIN@\tIDLE\tJCPU\tPCPU\tWHAT");
             }
             for user in user_info {
                 println!(