Do not print the "linking" messages.

.gitignore

@@ -3,3 +3,5 @@
 /example_logs
 TODO.org
 /result
+/.envrc
+/.direnv/

src/nix_util/activity.rs

@@ -215,7 +215,15 @@ impl Activity {
                 .as_ref()
                 .map(|phase| Cow::Owned(format!("[{}]", phase))),
             Activity::OptimizeStore(_activity_optimize_store) => None,
-            Activity::VerifyPaths(_activity_verify_paths) => None,
+            Activity::VerifyPaths(activity_verify_paths) => {
+                get_progress_bar(activity_verify_paths.done, activity_verify_paths.expected)
+                    .or_else(|| {
+                        get_progress_text(
+                            activity_verify_paths.done,
+                            activity_verify_paths.expected,
+                        )
+                    })
+            }
             Activity::Substitute(_activity_substitute) => None,
             Activity::QueryPathInfo(_activity_query_path_info) => None,
             Activity::PostBuildHook(_activity_post_build_hook) => None,
@@ -323,8 +331,11 @@ impl Activity {
             Activity::OptimizeStore(_activity_optimize_store) => {
                 panic!("Attempted to set the progress of an optimize store activity.");
             }
-            Activity::VerifyPaths(_activity_verify_paths) => {
-                panic!("Attempted to set the progress of a verify paths activity.");
+            Activity::VerifyPaths(activity_verify_paths) => {
+                activity_verify_paths.done = done;
+                activity_verify_paths.expected = expected;
+                activity_verify_paths.running = running;
+                activity_verify_paths.failed = failed;
             }
             Activity::Substitute(_activity_substitute) => {
                 panic!("Attempted to set the progress of a substitute activity.");
@@ -451,6 +462,10 @@ pub(crate) struct ActivityOptimizeStore {
 }
 pub(crate) struct ActivityVerifyPaths {
     pub(crate) state: ActivityState,
+    pub(crate) done: u64,
+    pub(crate) expected: u64,
+    pub(crate) running: u64,
+    pub(crate) failed: u64,
 }
 pub(crate) struct ActivitySubstitute {
     pub(crate) state: ActivityState,
@@ -493,6 +508,23 @@ impl Default for ActivityState {
 }
 
 fn get_progress_bar(done: u64, expected: u64) -> Option<Cow<'static, str>> {
+    if expected == 0 {
+        return None;
+    }
+    // ○◔◑◕●
+    // ○◎◉●
+    // ▁▂▃▄▅▆▇█
+    // ▏▎▍▌▋▊▉█
+    // ░▒▓█
+    //
+    // 🮷 download
+    // 🮸 upload
+    // 🮵
+    // 🮶
+    get_progress_bar_clockwise_circle(done, expected)
+}
+
+fn get_progress_bar_fade_in(done: u64, expected: u64) -> Option<Cow<'static, str>> {
     if expected == 0 {
         return None;
     }
@@ -520,6 +552,36 @@ fn get_progress_bar(done: u64, expected: u64) -> Option<Cow<'static, str>> {
     }
 }
 
+fn get_progress_bar_clockwise_circle(done: u64, expected: u64) -> Option<Cow<'static, str>> {
+    if expected == 0 {
+        return None;
+    }
+    let percent = done as f32 / expected as f32;
+    // ○◔◑◕●
+    // ○◎◉●
+    // ▁▂▃▄▅▆▇█
+    // ▏▎▍▌▋▊▉█
+    // ░▒▓█
+    //
+    // 🮷 download
+    // 🮸 upload
+    // 🮵
+    // 🮶
+    if percent < 0.25 {
+        Some(Cow::Borrowed("○"))
+    } else if percent < 0.5 {
+        Some(Cow::Borrowed("◔"))
+    } else if percent < 0.75 {
+        Some(Cow::Borrowed("◑"))
+    } else if percent < 1.0 {
+        Some(Cow::Borrowed("◕"))
+    } else if percent >= 1.0 {
+        Some(Cow::Borrowed("●"))
+    } else {
+        None
+    }
+}
+
 fn get_progress_text(done: u64, expected: u64) -> Option<Cow<'static, str>> {
     Some(Cow::Owned(format!("[{}/{}]", done, expected)))
 }

src/nix_util/activity_tree_stream.rs

@@ -163,6 +163,10 @@ impl ActivityTreeStream {
                             activity_start_verify_paths.parent,
                             Activity::VerifyPaths(ActivityVerifyPaths {
                                 state: ActivityState::default(),
+                                done: 0,
+                                expected: 0,
+                                running: 0,
+                                failed: 0,
                             }),
                         )?;
                     }

src/nix_util/running_build.rs

@@ -21,7 +21,6 @@ use super::nix_output_stream::ActivityResultMessage;
 use super::nix_output_stream::NixMessage;
 use super::tree_iter::DrawDagEntry;
 use super::tree_iter::ReverseTreeIter;
-use super::tree_iter::get_draw_order;
 
 pub(crate) struct RunningBuild<'db> {
     db_handle: &'db DbHandle,
@@ -107,7 +106,10 @@ impl<'db> RunningBuild<'db> {
         };
         match message {
             NixAction::Msg(msg_message) => {
-                if msg_message.level > 0 && msg_message.level < 5 {
+                if msg_message.level > 0
+                    && msg_message.level < 5
+                    && !(msg_message.level == 4 && msg_message.msg.starts_with("linking "))
+                {
                     eprintln!("LOG MESSAGE {}: {}", msg_message.level, msg_message.msg);
                 }
             }
@@ -129,9 +131,16 @@ impl<'db> RunningBuild<'db> {
                     ActivityResultMessage::SetPhase(_activity_result_set_phase) => {
                         self.print_current_status();
                     }
-                    ActivityResultMessage::Progress(_activity_result_progress) => {
+                    ActivityResultMessage::Progress(activity_result_progress) => {
+                        if activity_result_progress.done == activity_result_progress.expected
+                            && activity_result_progress.expected > 0
+                        {
+                            // If we finished the in-progress activity, always render so we show the 100% done version.
+                            self.print_current_status();
+                        } else {
                             self.maybe_print_current_status();
                         }
+                    }
                     ActivityResultMessage::SetExpected(_activity_result_set_expected) => {
                         self.maybe_print_current_status();
                     }