chore: use variables in Rust format strings

Change this:

    format!("{}", foo)

into this:

    format!("{foo}")

Support for this feature was added in Rust 1.58 (see
https://github.com/rust-lang/rust/releases/tag/1.58.0) and in 1.67
clippy suggests about this. Because the new style seems to be where
the Rust ecosystem is going, I think Subplot should follow to avoid
being needlessly different from most other projects.

Sponsored-by: author

1 files changed, 3 insertions, 3 deletions

diff --git a/src/bin/cli/mod.rs b/src/bin/cli/mod.rs
index 4e15efb..dacf9b6 100644
--- a/src/bin/cli/mod.rs
+++ b/src/bin/cli/mod.rs
@@ -97,7 +97,7 @@ impl TryFrom<&mut Document> for Metadata {
 
 impl Metadata {
     fn write_list(v: &[String], prefix: &str) {
-        v.iter().for_each(|entry| println!("{}: {}", prefix, entry))
+        v.iter().for_each(|entry| println!("{prefix}: {entry}"))
     }
 
     pub fn write_out(&self) {
@@ -107,7 +107,7 @@ impl Metadata {
         let templates: Vec<String> = self.impls.keys().map(String::from).collect();
         Self::write_list(&templates, "templates");
         for (template, filenames) in self.impls.iter() {
-            Self::write_list(filenames, &format!("functions[{}]", template));
+            Self::write_list(filenames, &format!("functions[{template}]"));
         }
         Self::write_list(&self.bibliographies, "bibliography");
         Self::write_list(&self.files, "file");
@@ -139,7 +139,7 @@ impl FromStr for OutputFormat {
         match s.to_ascii_lowercase().as_ref() {
             "plain" => Ok(OutputFormat::Plain),
             "json" => Ok(OutputFormat::Json),
-            _ => Err(format!("Unknown output format: `{}`", s)),
+            _ => Err(format!("Unknown output format: `{s}`")),
         }
     }
 }