easily watch logs as a slow test runs

clickable_links.py

@@ -12,6 +12,8 @@ import sys
 arg = sys.argv[1]
 if arg.startswith('http://most/'):
     os.execvp('urxvt', ['urxvt', '-e', 'sh', '-c', 'most ' + arg[len('http://most/'):]])
+if arg.startswith('http://tail/'):
+    os.execvp('urxvt', ['urxvt', '-e', 'sh', '-c', 'tail -f ' + arg[len('http://tail/'):]])
 elif arg.startswith('http://ui/'):
     os.execvp('urxvt', ['urxvt', '-e', 'sh', '-c', 'cd ~/abstreet/editor; cargo run ' + arg[len('http://ui/'):]])
 else:

docs/design/discrete_sim.md

@@ -60,6 +60,9 @@ out: replace accel_to_follow with something to warp to the right spot behind an
 agent and set the speed equal to min(follower's max speed, lead vehicle's
 current speed).
 
+- do we have a bug where vehicles can be too close when they're on adjacent but different traversables?
+- if we just warp to follow_dist away from a vehicle when we get too close, then we instantly decelerate.
+
 ## The software engineering question
 
 Is there a reasonable way to maintain both models and use one headless/editor

tests/src/runner.rs

@@ -133,9 +133,6 @@ impl TestRunner {
             }
         }
 
-        print!("Running {}...", test_name);
-        std::io::stdout().flush().unwrap();
-
         let start = std::time::Instant::now();
         let mut helper = TestHelper {
             debug_with_savestate: None,
@@ -144,6 +141,21 @@ impl TestRunner {
         std::fs::create_dir_all(std::path::Path::new(&output_path).parent().unwrap())
             .expect("Creating parent dir failed");
 
+        if self.flags.clickable_links {
+            print!(
+                "Running {}... {}",
+                test_name,
+                Paint::cyan(&format!("http://tail/{}", output_path))
+            );
+        } else {
+            print!(
+                "Running {}... {}",
+                test_name,
+                Paint::cyan(&format!("tail -f {}", output_path))
+            );
+        }
+        std::io::stdout().flush().unwrap();
+
         let pass = {
             let _stdout_redirect = Redirect::stdout(
                 std::fs::OpenOptions::new()