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Ren Kararou 2023-11-11 22:04:30 -06:00
commit f9d7c2e616
Signed by: spicywolf
GPG key ID: B0BA4EEC0714F8E6
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1
.gitignore vendored Normal file
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/target

347
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12
Cargo.toml Normal file
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[package]
name = "rndfile"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
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clap = { version = "4.4.8", features = ["derive"] }
rand = "0.8.5"
walkdir = "2.4.0"

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src/main.rs Normal file
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#![feature(io_error_more)]
use clap::Parser;
use rand::seq::SliceRandom;
use walkdir::WalkDir;
use std::fs::{metadata, OpenOptions};
use std::io::{Read, Write};
use std::path::PathBuf;
use std::io::{Error, ErrorKind};
use std::result::Result;
#[derive(Parser)]
#[command(name = "rndfile")]
#[command(author = "Ren Kararou <ren@kararou.space>")]
#[command(
about = "takes a top level directory and picks a random file from within",
long_about = None
)]
struct Args {
#[arg(long, short)]
out: Option<String>, // Output file
dir: Option<Vec<String>>, // Directories to Pick From
}
fn walkdirs(dirs: Vec<String>) -> Result<Vec<PathBuf>, Error> {
for dir in &dirs {
let m = metadata(&dir)?; // check if path exists
if !m.is_dir() {
return Err(Error::new(ErrorKind::NotADirectory, format!("Not a Directory: {}", dir)));
}
}
let mut files = Vec::new();
for dir in dirs {
for e in WalkDir::new(dir).into_iter().filter_map(|e| e.ok()) {
match e.metadata() {
Ok(m) => {
if m.is_file() {
files.push(e.path().to_owned());
}
}
Err(_) => continue,
}
}
}
Ok(files)
}
fn main() -> Result<(), Error> {
let args = Args::parse();
let files = if let Some(d) = args.dir {
walkdirs(d)?
} else {
walkdirs(vec![String::from(".")])?
};
if files.is_empty() {
return Err(Error::new(ErrorKind::DirectoryNotEmpty, "Directory(s) searched are emtpy!"));
}
// TODO: use an image processing crate to make sure the chosen file is an image and is the correct size!
let pick = files
.choose(&mut rand::thread_rng())
.expect("error picking random file");
println!("Chosen file: {}", &pick.display());
if let Some(out) = args.out.to_owned() {
// TODO: setup a constant size buffer and read/write that many bytes at a time to prevent
// locking up large amounts of system ram running on a large file.
let mut contents;
{
// open readfile after this line
let mut f = OpenOptions::new()
.read(true)
.open(&pick)
.expect("unable to open readfile");
let m = metadata(&pick).expect("unable to read metadata");
contents = vec![0; m.len() as usize];
f.read(&mut contents).expect("buffer overflow");
} // readfile closes here due to falling out of scope
let contents = contents; // remove mutability
{
// open outfile after this line
let mut f = OpenOptions::new()
.write(true)
.create(true)
.open(out.as_str())
.expect("unable to open outfile");
f.set_len(0u64).expect("unable to truncate file"); // just call ftruncate() on the poor
// thing
f.write_all(&contents).expect("unable to write to outfile");
f.flush().expect(
"unable to flush outfile (if this happens something has gone *terribly* wrong)",
);
} // outfile closes here due to falling out of scope
} else {
println!("{}", pick.display());
}
Ok(())
}