Implement persistent build tracking for more intuitive behavior

Author: rmartin16

pyproject.toml

@@ -90,6 +90,7 @@ dependencies = [
     "rich >= 12.6, < 14.0",
     "tomli >= 2.0, < 3.0; python_version <= '3.10'",
     "tomli_w >= 1.0, < 2.0",
+    "watchdog >= 3.0.0, < 5.0",
 ]
 
 [project.optional-dependencies]

src/briefcase/__main__.py

@@ -15,48 +15,49 @@
 def main():
     result = 0
     command = None
+
     printer = Printer()
     console = Console(printer=printer)
     logger = Log(printer=printer)
-    try:
-        Command, extra_cmdline = parse_cmdline(sys.argv[1:], console=console)
-        command = Command(logger=logger, console=console)
-        options, overrides = command.parse_options(extra=extra_cmdline)
-        command.parse_config(
-            Path.cwd() / "pyproject.toml",
-            overrides=overrides,
-        )
-        command(**options)
-    except HelpText as e:
-        logger.info()
-        logger.info(str(e))
-        result = e.error_code
-    except BriefcaseWarning as w:
-        # The case of something that hasn't gone right, but in an
-        # acceptable way.
-        logger.warning(str(w))
-        result = w.error_code
-    except BriefcaseTestSuiteFailure as e:
-        # Test suite status is logged when the test is executed.
-        # Set the return code, but don't log anything else.
-        result = e.error_code
-    except BriefcaseError as e:
-        logger.error()
-        logger.error(str(e))
-        result = e.error_code
-        logger.capture_stacktrace()
-    except Exception:
-        logger.capture_stacktrace()
-        raise
-    except KeyboardInterrupt:
-        logger.warning()
-        logger.warning("Aborted by user.")
-        logger.warning()
-        result = -42
-        if logger.save_log:
+
+    with suppress(KeyboardInterrupt):
+        try:
+            Command, extra_cmdline = parse_cmdline(sys.argv[1:], console=console)
+            command = Command(logger=logger, console=console)
+            options, overrides = command.parse_options(extra=extra_cmdline)
+            command.parse_config(Path.cwd() / "pyproject.toml", overrides=overrides)
+            command(**options)
+        except HelpText as e:
+            logger.info()
+            logger.info(str(e))
+            result = e.error_code
+        except BriefcaseWarning as w:
+            # The case of something that hasn't gone right, but in an
+            # acceptable way.
+            logger.warning(str(w))
+            result = w.error_code
+        except BriefcaseTestSuiteFailure as e:
+            # Test suite status is logged when the test is executed.
+            # Set the return code, but don't log anything else.
+            result = e.error_code
+        except BriefcaseError as e:
+            logger.error()
+            logger.error(str(e))
+            result = e.error_code
+            logger.capture_stacktrace()
+        except Exception:
             logger.capture_stacktrace()
-    finally:
-        with suppress(KeyboardInterrupt):
+            raise
+        except KeyboardInterrupt:
+            logger.warning()
+            logger.warning("Aborted by user.")
+            logger.warning()
+            result = -42
+            if logger.save_log:
+                logger.capture_stacktrace()
+        finally:
+            if command is not None:
+                command.tracking_save()
             logger.save_log_to_file(command)
 
     return result