plot_all: Skip plots, when they could not be parsed before

plot_all.py

@@ -120,7 +120,7 @@ class PlotAllCli:
         if not measurement_result.succeeded and not self.include_failed:
             cprint(
                 (
-                    "⚒ Measurement "
+                    "✔ Measurement "
                     f"{measurement_result.log_dir_for_test.relative_to(self._current_log_dir)} "
                     "Failed. Skipping. Use --include-failed to include it anyway."
                 ),
@@ -180,21 +180,45 @@ class PlotAllCli:
         rets = list[str]()
 
         for mode in modes:
-            output_file = Path(test_case_dir / f"time_{mode.value}_plot.{self.format}")
+            output_file = test_case_dir / f"time_{mode.value}_plot.{self.format}"
+            err_output_file = test_case_dir / f"time_{mode.value}_plot_error.txt"
+
+            if not self.force:
+                if output_file.is_file():
+                    cprint(
+                        (
+                            f"✔ {output_file.relative_to(self._current_log_dir)} already exists. "
+                            "Skipping. Use --force to overwrite."
+                        ),
+                        file=sys.stderr,
+                        color="cyan",
+                    )
 
-            if not self.force and output_file.is_file():
-                cprint(
-                    (
-                        f"⚒ {output_file.relative_to(self._current_log_dir)} already exists. "
-                        "Skipping. Use --force to overwrite."
-                    ),
-                    file=sys.stderr,
-                    color="cyan",
-                )
+                    rets.append("already exists")
 
-                rets.append("already exists")
+                    continue
+                elif err_output_file.is_file():
+                    with err_output_file.open("r") as file:
+                        err_msg = file.read().strip()
 
-                continue
+                    cprint(
+                        (
+                            "⨯ Trace could not be plotted in previous run. "
+                            f"{err_output_file.relative_to(self._current_log_dir)} exists: "
+                        ),
+                        file=sys.stderr,
+                        color="red",
+                    )
+                    cprint(err_msg, file=sys.stderr, color="red")
+                    cprint(
+                        "Skipping. Use --force to overwrite.",
+                        file=sys.stderr,
+                        color="red",
+                    )
+
+                    rets.append(err_msg)
+
+                    continue
 
             cprint(
                 (
@@ -230,6 +254,9 @@ class PlotAllCli:
                 )
                 cprint(f"⨯ {err}", file=sys.stderr, color="red")
 
+                with err_output_file.open("w") as file:
+                    print(err, file=file)
+
                 rets.append(str(err))
 
                 continue