Vendor dependencies

Let's see how I like this workflow.

vendor/procfs/examples/ps.rs

@@ -0,0 +1,25 @@
+#![allow(clippy::print_literal)]
+
+extern crate procfs;
+
+/// A very basic clone of `ps` on Linux, in the simple no-argument mode.
+/// It shows all the processes that share the same tty as our self
+
+fn main() {
+    let mestat = procfs::process::Process::myself().unwrap().stat().unwrap();
+    let tps = procfs::ticks_per_second().unwrap();
+
+    println!("{: >10} {: <8} {: >8} {}", "PID", "TTY", "TIME", "CMD");
+
+    let tty = format!("pty/{}", mestat.tty_nr().1);
+    for p in procfs::process::all_processes().unwrap() {
+        let prc = p.unwrap();
+        if let Ok(stat) = prc.stat() {
+            if stat.tty_nr == mestat.tty_nr {
+                // total_time is in seconds
+                let total_time = (stat.utime + stat.stime) as f32 / (tps as f32);
+                println!("{: >10} {: <8} {: >8} {}", stat.pid, tty, total_time, stat.comm);
+            }
+        }
+    }
+}