init v2

.gitignore

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+/target

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug executable 'all_the_passwords'",
+            "cargo": {
+                "args": [
+                    "build",
+                    "--bin=all_the_passwords",
+                    "--package=all_the_passwords"
+                ],
+                "filter": {
+                    "name": "all_the_passwords",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        },
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug unit tests in executable 'all_the_passwords'",
+            "cargo": {
+                "args": [
+                    "test",
+                    "--no-run",
+                    "--bin=all_the_passwords",
+                    "--package=all_the_passwords"
+                ],
+                "filter": {
+                    "name": "all_the_passwords",
+                    "kind": "bin"
+                }
+            },
+            "args": [],
+            "cwd": "${workspaceFolder}"
+        }
+    ]
+}

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "all_the_passwords"
+version = "0.1.0"
+dependencies = [
+ "num-format",
+]
+
+[[package]]
+name = "arrayvec"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
+
+[[package]]
+name = "itoa"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1a46d1a171d865aa5f83f92695765caa047a9b4cbae2cbf37dbd613a793fd4c"
+
+[[package]]
+name = "num-format"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a652d9771a63711fd3c3deb670acfbe5c30a4072e664d7a3bf5a9e1056ac72c3"
+dependencies = [
+ "arrayvec",
+ "itoa",
+]

Cargo.toml

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+[package]
+name = "all_the_passwords"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+num-format = "0.4.4"
+

src/main.rs

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+use std::io::{stderr, Write};
+use std::thread::{self, sleep};
+use std::time::{Duration, Instant};
+
+use num_format::{Locale, ToFormattedString};
+
+const ALL_CHARS: &'static str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789,.<>/?;':\"[]{}\\|-=_+`~!@#$%^&*()";
+const LEN: usize = 4;
+
+static mut SOFAR: u128 = 0;
+static mut TOTAL: usize = 0;
+
+/// Pseudo main 
+/// 
+/// Starts the number crunching (blocking on main thread!) and the
+/// timer thread which watches the main thread while
+/// reporting statistics about it. 
+fn start(char_list: &str, output_len: usize) {
+    /// Flag to communicate between main (combination crunching) and
+    /// timer threads.
+    static mut IS_DONE: bool = false;
+
+    let start = Instant::now();
+
+    // Just to report stats
+    let timer = thread::spawn(move || {
+        let mut out = stderr();
+
+        while unsafe { !IS_DONE } {
+            let mut elapsed = start.elapsed().as_secs() as u128;
+            // prevent div by zero err
+            if elapsed == 0 { elapsed = 1; }
+
+            let sofar = unsafe {SOFAR};
+            // output P/s
+            let _ = out.write(
+                format!("\rCalculated {} possibilities thus far, at {} p/s",
+                    sofar.to_formatted_string(&Locale::en_NA),
+                    (sofar / elapsed).to_formatted_string(&Locale::en_NA),
+                ).as_bytes());
+            let _ = out.flush();
+            sleep(Duration::from_secs(1));
+            
+            /*
+            // output remaining time
+            // I haven't tested to see if this timer is somewhat accurate...
+            // This is code I stole of reddit... what am I doing?
+            let remaining = unsafe { TOTAL as u128 / (sofar / elapsed) };
+            let sec = remaining % 60;
+            let min = (remaining / 60) % 60;
+            let hrs = (remaining / 60) / 60;
+            
+            let _ = out.write(
+            // TODO clear the whole line, don't just put cursor to the begining...
+                format!("\r{}%, {}h:{}m:{}s remaining                       ",
+                    unsafe { sofar / TOTAL as u128 },
+                    hrs, min, sec
+            ).as_bytes());
+            let _ = out.flush();
+            sleep(Duration::from_secs(1));
+            */
+        }
+    });
+
+    // starting with the blank string is important
+    calc(char_list, &"", output_len);
+
+    unsafe { IS_DONE = true; }
+    timer.join().unwrap();
+
+    eprintln!("\r{}ms to calculate the permutations (p) for {} chars (n) across {} slots (r).", start.elapsed().as_millis().to_formatted_string(&Locale::en_NA), char_list.len(), output_len);
+}
+
+fn main() {
+    // All the status messages are printed on stderr
+    // This way you can pipe the actual permutations into
+    // a file whilst still getting debug messages. 
+    let t = (ALL_CHARS.len() as u128).pow(LEN.try_into().unwrap());
+    unsafe { TOTAL = t as usize };
+    eprintln!(
+        "Calculating {} combinations...\n(Number may be trunkated if too large)\n",
+        unsafe { TOTAL }.to_formatted_string(&Locale::en_NA)
+    );
+
+    start(ALL_CHARS, LEN);
+}
+
+/// Recurseively create and print every combination of
+/// `choices` chars inside a string of `len` length.
+/// 
+/// 
+/// * `choices` string containing all the chars you wish
+/// to build random strings with. 
+/// 
+/// * `prefix` should be a blank string `""` unless you
+/// actually want a prefix on every output. This variable is
+/// mainly used within the recursive nature of the funciton.
+/// 
+/// * `len` the size that all the output strings wil be.
+fn calc(choices: &str, prefix: &str, len: usize) {
+    let need_to_fill = len - prefix.len();
+    match need_to_fill {
+        // the last char in the sequence, time to print
+        1 => {
+            for i in choices.chars() {
+                println!("{}{}", prefix, i);
+                unsafe { SOFAR = SOFAR + 1 };
+            }
+        }
+        // need to recurse farther into the sequence
+        _ => {
+            for i in choices.chars() {
+                calc(choices, &(prefix.to_string() + &i.to_string()), len);
+            }
+        }
+    }
+}