unpem

custom-pkgs/unpem/src/main.rs

@@ -0,0 +1,34 @@
+use std::{
+    error::Error,
+    io::{BufReader, Read, Write},
+};
+
+use clap::Parser;
+
+#[derive(clap::Parser)]
+struct Args {
+    file: Option<String>,
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let args = Args::parse();
+
+    match args.file {
+        None => unpem(&mut std::io::stdin().lock()),
+        Some(file) => {
+            let file = std::fs::File::open(file)?;
+            let mut file = BufReader::new(file);
+            unpem(&mut file)
+        }
+    }
+}
+
+fn unpem(input: &mut dyn Read) -> Result<(), Box<dyn Error>> {
+    let mut v = Vec::new();
+    input.read_to_end(&mut v)?;
+    let pem = pem::parse(v)?;
+
+    std::io::stdout().write_all(pem.contents())?;
+
+    Ok(())
+}