1 files changed, 31 insertions, 8 deletions
diff --git a/src/bin/obnam-benchmark.rs b/src/bin/obnam-benchmark.rs
index 4f2a9ed..617a0a3 100644
--- a/src/bin/obnam-benchmark.rs
+++ b/src/bin/obnam-benchmark.rs
@@ -1,12 +1,35 @@
 use obnam_benchmark::Specification;
+use std::fs::File;
+use std::path::PathBuf;
+use std::process::exit;
+use structopt::StructOpt;
+
+#[derive(Debug, StructOpt)]
+struct Opt {
+    #[structopt(parse(from_os_str))]
+    spec: PathBuf,
+
+    #[structopt(long, parse(from_os_str))]
+    output: PathBuf,
+}
 
 fn main() {
-    let yaml = r#"
-benchmarks:
-- benchmark: foo
-  backups: []
-"#;
-    let spec: Specification = serde_yaml::from_str(yaml).unwrap();
-    serde_json::to_writer(std::io::stdout(), &spec).unwrap();
-    println!();
+    if let Err(err) = real_main() {
+        eprintln!("ERROR: {}", err);
+        exit(1);
+    }
+}
+
+fn real_main() -> anyhow::Result<()> {
+    let opt = Opt::from_args();
+
+    println!("reading {}", opt.spec.display());
+    let input = File::open(&opt.spec)?;
+    let spec: Specification = serde_yaml::from_reader(&input)?;
+
+    println!("writing {}", opt.output.display());
+    let output = File::create(&opt.output)?;
+    serde_json::to_writer(&output, &spec)?;
+
+    Ok(())
 }