style: simplify string interpolation

src/benchmark/executor.rs

@@ -54,7 +54,7 @@ fn run_command_and_measure_common(
     );
 
     let result = execute_and_measure(command)
-        .with_context(|| format!("Failed to run command '{}'", command_name))?;
+        .with_context(|| format!("Failed to run command '{command_name}'"))?;
 
     if command_failure_action == CmdFailureAction::RaiseError && !result.status.success() {
         bail!(
@@ -62,7 +62,7 @@ fn run_command_and_measure_common(
             Alternatively, use the '--show-output' option to debug what went wrong.",
             result.status.code().map_or(
                 "The process has been terminated by a signal".into(),
-                |c| format!("Command terminated with non-zero exit code: {}", c)
+                |c| format!("Command terminated with non-zero exit code: {c}")
             )
         );
     }

src/benchmark/mod.rs

@@ -312,7 +312,7 @@ impl<'a> Benchmark<'a> {
         let (mean_str, time_unit) = format_duration_unit(t_mean, self.options.time_unit);
         let min_str = format_duration(t_min, Some(time_unit));
         let max_str = format_duration(t_max, Some(time_unit));
-        let num_str = format!("{} runs", t_num);
+        let num_str = format!("{t_num} runs");
 
         let user_str = format_duration(user_mean, Some(time_unit));
         let system_str = format_duration(system_mean, Some(time_unit));

src/benchmark/scheduler.rs

@@ -86,7 +86,7 @@ impl<'a> Scheduler<'a> {
                             "{}{} times faster than {}",
                             format!("{:8.2}", item.relative_speed).bold().green(),
                             if let Some(stddev) = item.relative_speed_stddev {
-                                format!(" ± {}", format!("{:.2}", stddev).green())
+                                format!(" ± {}", format!("{stddev:.2}").green())
                             } else {
                                 "".into()
                             },
@@ -104,7 +104,7 @@ impl<'a> Scheduler<'a> {
                             if item.is_fastest {
                                 "        ".into()
                             } else if let Some(stddev) = item.relative_speed_stddev {
-                                format!(" ± {}", format!("{:5.2}", stddev).green())
+                                format!(" ± {}", format!("{stddev:5.2}").green())
                             } else {
                                 "        ".into()
                             },

src/command.rs

@@ -62,13 +62,13 @@ impl<'a> Command<'a> {
         let parameters = self
             .get_unused_parameters()
             .fold(String::new(), |output, (parameter, value)| {
-                output + &format!("{} = {}, ", parameter, value)
+                output + &format!("{parameter} = {value}, ")
             });
         let parameters = parameters.trim_end_matches(", ");
         let parameters = if parameters.is_empty() {
             "".into()
         } else {
-            format!(" ({})", parameters)
+            format!(" ({parameters})")
         };
 
         format!("{}{}", self.get_name(), parameters)
@@ -81,7 +81,7 @@ impl<'a> Command<'a> {
     pub fn get_command(&self) -> Result<std::process::Command> {
         let command_line = self.get_command_line();
         let mut tokens = shell_words::split(&command_line)
-            .with_context(|| format!("Failed to parse command '{}'", command_line))?
+            .with_context(|| format!("Failed to parse command '{command_line}'"))?
             .into_iter();
 
         if let Some(program_name) = tokens.next() {
@@ -100,7 +100,7 @@ impl<'a> Command<'a> {
     pub fn get_unused_parameters(&self) -> impl Iterator<Item = &(&'a str, ParameterValue)> {
         self.parameters
             .iter()
-            .filter(move |(parameter, _)| !self.expression.contains(&format!("{{{}}}", parameter)))
+            .filter(move |(parameter, _)| !self.expression.contains(&format!("{{{parameter}}}")))
     }
 
     fn replace_parameters_in(&self, original: &str) -> String {
@@ -108,7 +108,7 @@ impl<'a> Command<'a> {
         let mut replacements = BTreeMap::<String, String>::new();
         for (param_name, param_value) in &self.parameters {
             replacements.insert(
-                format!("{{{param_name}}}", param_name = param_name),
+                format!("{{{param_name}}}"),
                 param_value.to_string(),
             );
         }

src/export/asciidoc.rs

@@ -32,7 +32,7 @@ impl MarkupExporter for AsciidocExporter {
     }
 
     fn command(&self, cmd: &str) -> String {
-        format!("`{}`", cmd)
+        format!("`{cmd}`")
     }
 }
 
@@ -71,8 +71,7 @@ fn test_asciidoc_exporter_table_header() {
 #[cfg(test)]
 fn cfg_test_table_header(unit_short_name: &str) -> String {
     format!(
-        "[cols=\"<,>,>,>,>\"]\n|===\n| Command \n| Mean [{unit}] \n| Min [{unit}] \n| Max [{unit}] \n| Relative \n",
+        "[cols=\"<,>,>,>,>\"]\n|===\n| Command \n| Mean [{unit_short_name}] \n| Min [{unit_short_name}] \n| Max [{unit_short_name}] \n| Relative \n"
-        unit = unit_short_name
     )
 }
 

src/export/csv.rs

@@ -31,7 +31,7 @@ impl Exporter for CsvExporter {
             .collect();
             if let Some(res) = results.first() {
                 for param_name in res.parameters.keys() {
-                    headers.push(Cow::Owned(format!("parameter_{}", param_name).into_bytes()));
+                    headers.push(Cow::Owned(format!("parameter_{param_name}").into_bytes()));
                 }
             }
             writer.write_record(headers)?;

src/export/markdown.rs

@@ -24,7 +24,7 @@ impl MarkupExporter for MarkdownExporter {
     }
 
     fn command(&self, cmd: &str) -> String {
-        format!("`{}`", cmd)
+        format!("`{cmd}`")
     }
 }
 
@@ -53,8 +53,7 @@ fn test_markdown_formatter_table_divider() {
 #[cfg(test)]
 fn cfg_test_table_header(unit_short_name: String) -> String {
     format!(
-        "| Command | Mean [{unit}] | Min [{unit}] | Max [{unit}] | Relative |\n|:---|---:|---:|---:|---:|\n",
+        "| Command | Mean [{unit_short_name}] | Min [{unit_short_name}] | Max [{unit_short_name}] | Relative |\n|:---|---:|---:|---:|---:|\n"
-        unit = unit_short_name
     )
 }
 

src/export/markup.rs

@@ -32,9 +32,9 @@ pub trait MarkupExporter {
         // emit table header data
         table.push_str(&self.table_row(&[
             "Command",
-            &format!("Mean {}", notation),
+            &format!("Mean {notation}"),
-            &format!("Min {}", notation),
+            &format!("Min {notation}"),
-            &format!("Max {}", notation),
+            &format!("Max {notation}"),
             "Relative",
         ]));
 
@@ -59,7 +59,7 @@ pub trait MarkupExporter {
             let rel_stddev_str = if entry.is_fastest {
                 "".into()
             } else if let Some(stddev) = entry.relative_speed_stddev {
-                format!(" ± {:.2}", stddev)
+                format!(" ± {stddev:.2}")
             } else {
                 "".into()
             };
@@ -67,10 +67,10 @@ pub trait MarkupExporter {
             // prepare table row entries
             table.push_str(&self.table_row(&[
                 &self.command(&cmd_str),
-                &format!("{}{}", mean_str, stddev_str),
+                &format!("{mean_str}{stddev_str}"),
                 &min_str,
                 &max_str,
-                &format!("{}{}", rel_str, rel_stddev_str),
+                &format!("{rel_str}{rel_stddev_str}"),
             ]))
         }
 

src/export/mod.rs

@@ -108,7 +108,7 @@ impl ExportManager {
                 ExportTarget::Stdout
             } else {
                 let _ = File::create(filename)
-                    .with_context(|| format!("Could not create export file '{}'", filename))?;
+                    .with_context(|| format!("Could not create export file '{filename}'"))?;
                 ExportTarget::File(filename.to_string())
             },
         });
@@ -153,5 +153,5 @@ impl ExportManager {
 fn write_to_file(filename: &str, content: &[u8]) -> Result<()> {
     let mut file = OpenOptions::new().write(true).open(filename)?;
     file.write_all(content)
-        .with_context(|| format!("Failed to export results to '{}'", filename))
+        .with_context(|| format!("Failed to export results to '{filename}'"))
 }

src/export/orgmode.rs

@@ -18,7 +18,7 @@ impl MarkupExporter for OrgmodeExporter {
     }
 
     fn command(&self, cmd: &str) -> String {
-        format!("={}=", cmd)
+        format!("={cmd}=")
     }
 }
 
@@ -58,8 +58,7 @@ fn test_orgmode_formatter_table_line() {
 #[cfg(test)]
 fn cfg_test_table_header(unit_short_name: String) -> String {
     format!(
-        "| Command  |  Mean [{unit}] |  Min [{unit}] |  Max [{unit}] |  Relative |\n|--+--+--+--+--|\n",
+        "| Command  |  Mean [{unit_short_name}] |  Min [{unit_short_name}] |  Max [{unit_short_name}] |  Relative |\n|--+--+--+--+--|\n"
-        unit = unit_short_name
     )
 }
 

src/options.rs

@@ -38,7 +38,7 @@ impl Default for Shell {
 impl fmt::Display for Shell {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
-            Shell::Default(cmd) => write!(f, "{}", cmd),
+            Shell::Default(cmd) => write!(f, "{cmd}"),
             Shell::Custom(cmdline) => write!(f, "{}", shell_words::join(cmdline)),
         }
     }
@@ -457,7 +457,7 @@ impl Options {
 fn test_default_shell() {
     let shell = Shell::default();
 
-    let s = format!("{}", shell);
+    let s = format!("{shell}");
     assert_eq!(&s, DEFAULT_SHELL);
 
     let cmd = shell.command();
@@ -468,7 +468,7 @@ fn test_default_shell() {
 fn test_can_parse_shell_command_line_from_str() {
     let shell = Shell::parse_from_str("shell -x 'aaa bbb'").unwrap();
 
-    let s = format!("{}", shell);
+    let s = format!("{shell}");
     assert_eq!(&s, "shell -x 'aaa bbb'");
 
     let cmd = shell.command();

src/parameter/mod.rs

@@ -16,7 +16,7 @@ impl Display for ParameterValue {
             ParameterValue::Text(ref value) => value.clone(),
             ParameterValue::Numeric(value) => value.to_string(),
         };
-        write!(f, "{}", str)
+        write!(f, "{str}")
     }
 }
 

src/util/units.rs

@@ -26,7 +26,7 @@ impl Unit {
     /// Returns the Second value formatted for the Unit.
     pub fn format(self, value: Second) -> String {
         match self {
-            Unit::Second => format!("{:.3}", value),
+            Unit::Second => format!("{value:.3}"),
             Unit::MilliSecond => format!("{:.1}", value * 1e3),
             Unit::MicroSecond => format!("{:.1}", value * 1e6),
         }