add a -p option in keygen to save the public key

README.md

@@ -95,7 +95,7 @@ $ yage --completion fish > ~/.config/fish/completions/yage.fish
 First generate a new age key pair:
 
 ```sh
-$ yage keygen -o prod.key
+$ yage keygen -o prod.key -p prod.pub
 Public key: age15eesfkh778yljxzgwdq5vaqmmchg5py480vplsymzzqf0dwe5gnqrexdq6
 ```
 
@@ -112,7 +112,6 @@ AGE-SECRET-KEY-1EZEU9RUTW3K5GV98ER6RHMS73QJNQ37ARWG6MWHXM4JP8FVD3A9QK2DD70
 The public key could be committed to a git repository:
 
 ```sh
-$ yage pubkey -K prod.key -o prod.pub
 $ git add prod.pub
 $ git commit -m "Add prod public key"
 ```

doc/CommandLineHelp.md

@@ -160,6 +160,7 @@ The key is written in the age format, which is compatible with the age tool.
 * `-o`, `--output <OUTPUT>` — The output path to the private key file
 
   Default value: `-`
+* `-p`, `--public <PUBLIC>` — The output path to the public key file
 
 
 

src/cli.rs

@@ -41,6 +41,10 @@ pub struct KeygenArgs {
     /// The private key is written to the standard output by default.
     #[clap(short, long, default_value = "-")]
     pub output: PathBuf,
+
+    /// The output path to the public key file
+    #[clap(short, long)]
+    pub public: Option<PathBuf>,
 }
 
 /// Convert private age keys to their public key

src/keygen.rs

@@ -6,9 +6,13 @@ use crate::error::{IOResultExt, Result};
 use crate::util::stdout_or_file;
 
 pub fn keygen(args: &KeygenArgs) -> Result<()> {
-    let mut output = stdout_or_file(&args.output)?;
     let key = Identity::generate();
-    info!("Public key: {}", key.to_public());
+    let mut output = stdout_or_file(&args.output)?;
     writeln!(output, "{}", key.to_string().expose_secret()).path_ctx(&args.output)?;
+    info!("Public key: {}", key.to_public());
+    if let Some(ref public) = args.public {
+        let mut output = stdout_or_file(public)?;
+        writeln!(output, "{}", key.to_public()).path_ctx(public)?;
+    }
     Ok(())
 }