fix: clean ephemeral line before carriage return

craft_cli/messages.py

@@ -29,6 +29,7 @@
 import os
 import pathlib
 import select
+import shutil
 import sys
 import threading
 import traceback
@@ -720,6 +721,10 @@ def _report_error(self, error: errors.CraftError) -> None:
             full_stream = sys.stderr
 
         # the initial message
+        self._printer.spinner.stop()
+        cleaner = " " * (shutil.get_terminal_size().columns - 1)
+        line = "\r" + cleaner + "\r"
+        print(line, end="", flush=True, file=sys.stderr)
         self._printer.show(sys.stderr, str(error), use_timestamp=use_timestamp, end_line=True)
 
         if isinstance(error, errors.CraftCommandError):

examples.py

@@ -513,6 +513,34 @@ def example_30():
         time.sleep(0.001)
 
 
+def example_31():
+    """Longer progress messages do not stray."""
+    emit.progress("Setting up computer for build...")
+    time.sleep(6)
+    emit.progress("Building computer...")
+    time.sleep(6)
+    emit.message("Done")
+
+def example_32():
+    """Multiline error message."""
+    emit.progress("Setting up computer for build...")
+    time.sleep(1)
+    emit.progress("Building computer...")
+    time.sleep(6)
+    raise CraftError("Setup failed\nfoo")
+
+
+def example_33():
+    """Stream messages don't clobber."""
+    emit.progress("Running multiple commands...")
+    emit.progress("Running multiple commands...")
+    with emit.open_stream() as stream:
+        subprocess.run(["ls", "-l"], stdout=stream, stderr=stream)
+    time.sleep(1)
+    emit.progress("Almost...")
+    time.sleep(1)
+    emit.message("Great!")
+
 # -- end of test cases
 
 if len(sys.argv) < 2: