Add a helper function for outputting details

src/ci/citool/src/analysis.rs

@@ -1,6 +1,6 @@
 use crate::metrics;
 use crate::metrics::{JobMetrics, JobName, get_test_suites};
-use crate::utils::pluralize;
+use crate::utils::{output_details, pluralize};
 use build_helper::metrics::{
     BuildStep, JsonRoot, TestOutcome, TestSuite, TestSuiteMetadata, format_build_steps,
 };
@@ -19,14 +19,9 @@ fn record_bootstrap_step_durations(metrics: &JsonRoot) {
         let step = BuildStep::from_invocation(invocation);
         let table = format_build_steps(&step);
         eprintln!("Step `{}`\n{table}\n", invocation.cmdline);
-        println!(
-            r"<details>
-<summary>{}</summary>
-<pre><code>{table}</code></pre>
-</details>
-",
-            invocation.cmdline
-        );
+        output_details(&invocation.cmdline, || {
+            println!("<pre><code>{table}</code></pre>");
+        });
     }
     eprintln!("Recorded {} bootstrap invocation(s)", metrics.invocations.len());
 }

src/ci/citool/src/utils.rs

@@ -13,3 +13,17 @@ pub fn read_to_string<P: AsRef<Path>>(path: P) -> anyhow::Result<String> {
 pub fn pluralize(text: &str, count: usize) -> String {
     if count == 1 { text.to_string() } else { format!("{text}s") }
 }
+
+/// Outputs a HTML <details> section with the provided summary.
+/// Output printed by `func` will be contained within the section.
+pub fn output_details<F>(summary: &str, func: F)
+where
+    F: FnOnce(),
+{
+    println!(
+        r"<details>
+<summary>{summary}</summary>"
+    );
+    func();
+    println!("</details>\n");
+}