1 files changed, 75 insertions, 0 deletions
diff --git a/vendor/clap/examples/tutorial_derive/04_03_relations.rs b/vendor/clap/examples/tutorial_derive/04_03_relations.rs
new file mode 100644
index 0000000..8657ebe
--- /dev/null
+++ b/vendor/clap/examples/tutorial_derive/04_03_relations.rs
@@ -0,0 +1,75 @@
+use clap::{Args, Parser};
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+struct Cli {
+    #[command(flatten)]
+    vers: Vers,
+
+    /// some regular input
+    #[arg(group = "input")]
+    input_file: Option<String>,
+
+    /// some special input argument
+    #[arg(long, group = "input")]
+    spec_in: Option<String>,
+
+    #[arg(short, requires = "input")]
+    config: Option<String>,
+}
+
+#[derive(Args)]
+#[group(required = true, multiple = false)]
+struct Vers {
+    /// set version manually
+    #[arg(long, value_name = "VER")]
+    set_ver: Option<String>,
+
+    /// auto inc major
+    #[arg(long)]
+    major: bool,
+
+    /// auto inc minor
+    #[arg(long)]
+    minor: bool,
+
+    /// auto inc patch
+    #[arg(long)]
+    patch: bool,
+}
+
+fn main() {
+    let cli = Cli::parse();
+
+    // Let's assume the old version 1.2.3
+    let mut major = 1;
+    let mut minor = 2;
+    let mut patch = 3;
+
+    // See if --set_ver was used to set the version manually
+    let vers = &cli.vers;
+    let version = if let Some(ver) = vers.set_ver.as_deref() {
+        ver.to_string()
+    } else {
+        // Increment the one requested (in a real program, we'd reset the lower numbers)
+        let (maj, min, pat) = (vers.major, vers.minor, vers.patch);
+        match (maj, min, pat) {
+            (true, _, _) => major += 1,
+            (_, true, _) => minor += 1,
+            (_, _, true) => patch += 1,
+            _ => unreachable!(),
+        };
+        format!("{major}.{minor}.{patch}")
+    };
+
+    println!("Version: {version}");
+
+    // Check for usage of -c
+    if let Some(config) = cli.config.as_deref() {
+        let input = cli
+            .input_file
+            .as_deref()
+            .unwrap_or_else(|| cli.spec_in.as_deref().unwrap());
+        println!("Doing work using input {input} and config {config}");
+    }
+}