Added more extensive ANSI color printing support on terminals. (#20958)
This adds support to AnsiTerminal for colored output, and makes all tool output written to stderr (with the printError function) colored red.
No color codes are sent if the terminal doesn't support color (or isn't a terminal).
Also makes "progress" output print the elapsed time when not connected to a terminal, so that redirected output and terminal output match (redirected output doesn't print the spinner, however).
Addresses #17307
diff --git a/packages/flutter_tools/lib/runner.dart b/packages/flutter_tools/lib/runner.dart
index a8f7a9a..d727c70 100644
--- a/packages/flutter_tools/lib/runner.dart
+++ b/packages/flutter_tools/lib/runner.dart
@@ -75,22 +75,15 @@
String getFlutterVersion(),
) async {
if (error is UsageException) {
- stderr.writeln(error.message);
- stderr.writeln();
- stderr.writeln(
- "Run 'flutter -h' (or 'flutter <command> -h') for available "
- 'flutter commands and options.'
- );
+ printError('${error.message}\n');
+ printError("Run 'flutter -h' (or 'flutter <command> -h') for available flutter commands and options.");
// Argument error exit code.
return _exit(64);
} else if (error is ToolExit) {
if (error.message != null)
- stderr.writeln(error.message);
- if (verbose) {
- stderr.writeln();
- stderr.writeln(stackTrace.toString());
- stderr.writeln();
- }
+ printError(error.message);
+ if (verbose)
+ printError('\n$stackTrace\n');
return _exit(error.exitCode ?? 1);
} else if (error is ProcessExit) {
// We've caught an exit code.
