Make time elapsed only show up initially

src/output/progress_bar.rs

@@ -9,13 +9,42 @@ const TICK_SETTINGS: (&str, u64) = ("⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏ ", 80);
 #[cfg(windows)]
 const TICK_SETTINGS: (&str, u64) = (r"+-x| ", 200);
 
+const DEFAULT_MESSAGE_TEMPLATE: &str = "{msg:<30}";
+
+fn create_progress_template(msg_template: &str) -> String {
+    format!(
+        " {{spinner}} {} {{wide_bar}} ETA {{eta_precise}} ",
+        msg_template
+    )
+}
+
+/// Replace the usual `message` in a progress bar with the result of evaluating `template`.
+/// The `template` may contain a `ProgressBar`'s templated fields.
+#[must_use]
+pub fn replace_message_template(bar: ProgressBar, template: &str) -> ProgressBar {
+    let old_style = bar.style();
+    let new_template = create_progress_template(template);
+    let new_style = old_style
+        .template(&new_template)
+        .expect("no template error");
+    bar.with_style(new_style)
+}
+
+/// Reset a progress bar's template to the default.
+/// This is useful after calling `replace_message_template()`.
+#[must_use]
+pub fn reset_progress_template(bar: ProgressBar) -> ProgressBar {
+    replace_message_template(bar, DEFAULT_MESSAGE_TEMPLATE)
+}
+
 /// Return a pre-configured progress bar
 pub fn get_progress_bar(length: u64, msg: &str, option: OutputStyleOption) -> ProgressBar {
+    let template = create_progress_template(DEFAULT_MESSAGE_TEMPLATE);
     let progressbar_style = match option {
         OutputStyleOption::Basic | OutputStyleOption::Color => ProgressStyle::default_bar(),
         _ => ProgressStyle::default_spinner()
             .tick_chars(TICK_SETTINGS.0)
-            .template(" {spinner} {msg:<30} {wide_bar} Time: {elapsed} ETA {eta_precise} ")
+            .template(&template)
             .expect("no template error"),
     };