1 files changed, 34 insertions, 0 deletions
diff --git a/vendor/clap/examples/tutorial_derive/04_02_validate.rs b/vendor/clap/examples/tutorial_derive/04_02_validate.rs
new file mode 100644
index 0000000..3391d5b
--- /dev/null
+++ b/vendor/clap/examples/tutorial_derive/04_02_validate.rs
@@ -0,0 +1,34 @@
+use std::ops::RangeInclusive;
+
+use clap::Parser;
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+struct Cli {
+    /// Network port to use
+    #[arg(value_parser = port_in_range)]
+    port: u16,
+}
+
+fn main() {
+    let cli = Cli::parse();
+
+    println!("PORT = {}", cli.port);
+}
+
+const PORT_RANGE: RangeInclusive<usize> = 1..=65535;
+
+fn port_in_range(s: &str) -> Result<u16, String> {
+    let port: usize = s
+        .parse()
+        .map_err(|_| format!("`{s}` isn't a port number"))?;
+    if PORT_RANGE.contains(&port) {
+        Ok(port as u16)
+    } else {
+        Err(format!(
+            "port not in range {}-{}",
+            PORT_RANGE.start(),
+            PORT_RANGE.end()
+        ))
+    }
+}