feat: allow report to write to named file

Sponsored-by: author

1 files changed, 12 insertions, 3 deletions

diff --git a/src/bin/obnam-benchmark.rs b/src/bin/obnam-benchmark.rs
index 8b75229..db04d0a 100644
--- a/src/bin/obnam-benchmark.rs
+++ b/src/bin/obnam-benchmark.rs
@@ -182,6 +182,10 @@ impl Steps {
 
 #[derive(Debug, StructOpt)]
 struct Report {
+    /// File where to write the report. Stdout by default.
+    #[structopt(short, long, parse(from_os_str))]
+    output: Option<PathBuf>,
+
     /// Names of the results file for which to produce a report.
     #[structopt(parse(from_os_str))]
     filenames: Vec<PathBuf>,
@@ -190,11 +194,16 @@ struct Report {
 impl Report {
     fn run(&self) -> anyhow::Result<()> {
         info!("Reporting results");
-        let mut report = Reporter::default();
+        let mut reporter = Reporter::default();
         for filename in self.filenames.iter() {
-            report.push(SuiteMeasurements::from_file(filename)?);
+            reporter.push(SuiteMeasurements::from_file(filename)?);
+        }
+        if let Some(output) = &self.output {
+            let mut file = File::create(output)?;
+            reporter.write(&mut file)?;
+        } else {
+            reporter.write(&mut std::io::stdout())?;
         }
-        report.write(&mut std::io::stdout())?;
         Ok(())
     }
 }