Merge pull request #55 from aparcar/openmetrics

add support for OpenMetrics message format

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 # [Unreleased]
+### Added
+- New message output format for [OpenMetrics](https://openmetrics.io).
 
 ## [1.1.0] - 2021-07-28
 ### Fixed
@@ -66,4 +68,4 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 [1.0.0]: https://github.com/bheisler/cargo-criterion/compare/1.0.0-alpha3...1.0.0
 [1.0.1]: https://github.com/bheisler/cargo-criterion/compare/1.0.0-alpha3...1.0.1
 [1.0.1]: https://github.com/bheisler/cargo-criterion/compare/1.0.1...1.1.0
-[Unreleased]: https://github.com/bheisler/cargo-criterion/compare/1.1.0...HEAD
+[Unreleased]: https://github.com/bheisler/cargo-criterion/compare/1.1.0...HEAD

src/config.rs

@@ -136,11 +136,13 @@ impl PlottingBackend {
 #[derive(Debug)]
 pub enum MessageFormat {
     Json,
+    OpenMetrics,
 }
 impl MessageFormat {
     fn from_str(s: &str) -> MessageFormat {
         match s {
             "json" => MessageFormat::Json,
+            "openmetrics" => MessageFormat::OpenMetrics,
             other => panic!("Unknown message format: {}", other),
         }
     }
@@ -412,10 +414,10 @@ bencher: Emulates the output format of the bencher crate and nightly-only libtes
             .arg(Arg::with_name("message-format")
                 .long("message-format")
                 .takes_value(true)
-                .possible_values(&["json"])
+                .possible_values(&["json", "openmetrics"])
                 .help("If set, machine-readable output of the requested format will be printed to stdout.")
                 .long_help(
-"Change the machine-readable output format. Possible values are [json].
+"Change the machine-readable output format. Possible values are [json, openmetrics].
 
 Machine-readable information on the benchmarks will be printed in the requested format to stdout.
 All of cargo-criterion's other output will be printed to stderr.