style: inline variables into format strings

Cargo.toml

@@ -134,7 +134,8 @@ testutils = { path = "lib/testutils" }
 
 [workspace.lints.clippy]
 explicit_iter_loop = "warn"
-
+uninlined_format_args = "warn"
+ 
 # Insta suggests compiling these packages in opt mode for faster testing.
 # See https://docs.rs/insta/latest/insta/#optional-faster-runs.
 [profile.dev.package]

cli/build.rs

@@ -33,9 +33,9 @@ fn main() {
     println!("cargo:rerun-if-env-changed=NIX_JJ_GIT_HASH");
 
     if let Some(git_hash) = get_git_hash() {
-        println!("cargo:rustc-env=JJ_VERSION={}-{}", version, git_hash);
+        println!("cargo:rustc-env=JJ_VERSION={version}-{git_hash}");
     } else {
-        println!("cargo:rustc-env=JJ_VERSION={}", version);
+        println!("cargo:rustc-env=JJ_VERSION={version}");
     }
 }
 

cli/src/cli_util.rs

@@ -3314,7 +3314,7 @@ impl CliRunner {
                 .flatten()
                 .map(|path| format!("- {}", path.display()))
                 .join("\n");
-            e.hinted(format!("Check the following config files:\n{}", paths))
+            e.hinted(format!("Check the following config files:\n{paths}"))
         })?;
 
         let string_args = expand_args(ui, &self.app, env::args_os(), &config)?;

cli/src/command_error.rs

@@ -352,7 +352,7 @@ impl From<SnapshotError> for CommandError {
                         size_diff, max_size.0, max_size,
                     )
                 } else {
-                    format!("it is {}; the maximum size allowed is ~{}.", size, max_size,)
+                    format!("it is {size}; the maximum size allowed is ~{max_size}.")
                 };
 
                 user_error(format!(

cli/src/commands/git/push.rs

@@ -123,7 +123,7 @@ pub struct GitPushArgs {
 
 fn make_bookmark_term(bookmark_names: &[impl fmt::Display]) -> String {
     match bookmark_names {
-        [bookmark_name] => format!("bookmark {}", bookmark_name),
+        [bookmark_name] => format!("bookmark {bookmark_name}"),
         bookmark_names => format!("bookmarks {}", bookmark_names.iter().join(", ")),
     }
 }

cli/src/commands/operation/diff.rs

@@ -282,7 +282,7 @@ pub fn show_op_diff(
         })?;
         for (name, (from_target, to_target)) in changed_local_bookmarks {
             with_content_format.write(formatter, |formatter| {
-                writeln!(formatter, "{}:", name)?;
+                writeln!(formatter, "{name}:")?;
                 write_ref_target_summary(
                     formatter,
                     current_repo,
@@ -310,7 +310,7 @@ pub fn show_op_diff(
         with_content_format.write(formatter, |formatter| writeln!(formatter, "Changed tags:"))?;
         for (name, (from_target, to_target)) in changed_tags {
             with_content_format.write(formatter, |formatter| {
-                writeln!(formatter, "{}:", name)?;
+                writeln!(formatter, "{name}:")?;
                 write_ref_target_summary(
                     formatter,
                     current_repo,
@@ -351,7 +351,7 @@ pub fn show_op_diff(
         };
         for ((name, remote_name), (from_ref, to_ref)) in changed_remote_bookmarks {
             with_content_format.write(formatter, |formatter| {
-                writeln!(formatter, "{}@{}:", name, remote_name)?;
+                writeln!(formatter, "{name}@{remote_name}:")?;
                 write_ref_target_summary(
                     formatter,
                     current_repo,
@@ -422,7 +422,7 @@ fn write_ref_target_summary(
         })?;
         write!(formatter, " ")?;
         if let Some(prefix) = prefix {
-            write!(formatter, "{} ", prefix)?;
+            write!(formatter, "{prefix} ")?;
         }
         Ok(())
     };

cli/src/commands/sparse.rs

@@ -177,7 +177,7 @@ fn edit_sparse(
                 workspace_relative_sparse_path.display()
             ))
         })?;
-        writeln!(&mut content, "{}", path_string).unwrap();
+        writeln!(&mut content, "{path_string}").unwrap();
     }
 
     let content = edit_temp_file(

cli/src/description_util.rs

@@ -39,10 +39,9 @@ pub fn edit_description(
     settings: &UserSettings,
 ) -> Result<String, CommandError> {
     let description = format!(
-        r#"{}
+        r#"{description}
 JJ: Lines starting with "JJ: " (like this one) will be removed.
-"#,
-        description
+"#
     );
 
     let description = edit_temp_file(

cli/src/formatter.rs

@@ -395,7 +395,7 @@ impl<W: Write> ColorFormatter<W> {
         }
         if let Some(d) = new_debug {
             if !d.is_empty() {
-                write!(self.output, "<<{}::", d)?;
+                write!(self.output, "<<{d}::")?;
             }
             self.current_debug = Some(d);
         }
@@ -471,7 +471,7 @@ fn color_for_name_or_hex(name_or_hex: &str) -> Result<Color, config::ConfigError
         "bright cyan" => Ok(Color::Cyan),
         "bright white" => Ok(Color::White),
         _ => color_for_hex(name_or_hex)
-            .ok_or_else(|| config::ConfigError::Message(format!("invalid color: {}", name_or_hex))),
+            .ok_or_else(|| config::ConfigError::Message(format!("invalid color: {name_or_hex}"))),
     }
 }
 
@@ -786,7 +786,7 @@ mod tests {
         for [label, color] in labels_and_colors {
             // Use the color name as the label.
             config_builder = config_builder
-                .set_override(format!("colors.{}", label), color)
+                .set_override(format!("colors.{label}"), color)
                 .unwrap();
         }
         let mut output: Vec<u8> = vec![];

cli/src/ui.rs

@@ -632,7 +632,7 @@ impl Ui {
         let default_choice = default.map(|c| if c { "Y" } else { "N" });
 
         let choice = self.prompt_choice(
-            &format!("{} {}", prompt, default_str),
+            &format!("{prompt} {default_str}"),
             &["y", "n", "yes", "no", "Yes", "No", "YES", "NO"],
             default_choice,
         )?;

cli/testing/fake-formatter.rs

@@ -70,7 +70,7 @@ fn main() -> ExitCode {
     let args: Args = Args::parse();
     // Code formatters tend to print errors before printing the result.
     if let Some(data) = args.stderr {
-        eprint!("{}", data);
+        eprint!("{data}");
     }
     let stdout = if let Some(data) = args.stdout {
         // Other content-altering flags don't apply to --stdout.
@@ -106,14 +106,14 @@ fn main() -> ExitCode {
         }
         stdout
     };
-    print!("{}", stdout);
+    print!("{stdout}");
     if let Some(path) = args.tee {
         let mut file = OpenOptions::new()
             .create(true)
             .append(true)
             .open(path)
             .unwrap();
-        write!(file, "{}", stdout).unwrap();
+        write!(file, "{stdout}").unwrap();
     }
     if args.fail {
         ExitCode::FAILURE

cli/tests/test_diff_command.rs

@@ -433,8 +433,8 @@ fn test_diff_types() {
             &[
                 "diff",
                 "--types",
-                &format!(r#"--from=description("{}")"#, from),
-                &format!(r#"--to=description("{}")"#, to),
+                &format!(r#"--from=description("{from}")"#),
+                &format!(r#"--to=description("{to}")"#),
             ],
         )
     };

lib/src/default_index/store.rs

@@ -354,10 +354,7 @@ impl IndexStore for DefaultIndexStore {
                         );
                     }
                     ReadonlyIndexLoadError::Other { name: _, error } => {
-                        eprintln!(
-                            "{err} (maybe the format has changed): {source}. Reindexing...",
-                            source = error
-                        );
+                        eprintln!("{err} (maybe the format has changed): {error}. Reindexing...");
                     }
                 }
                 self.reinit().map_err(|err| IndexReadError(err.into()))?;

lib/src/repo.rs

@@ -762,7 +762,7 @@ impl RepoLoader {
                 tx.repo_mut().rebase_descendants(settings)?;
             }
             let tx_description = tx_description.map_or_else(
-                || format!("merge {} operations", num_operations),
+                || format!("merge {num_operations} operations"),
                 |tx_description| tx_description.to_string(),
             );
             let merged_repo = tx.write(tx_description).leave_unpublished();