erik/dcat
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Added CatError class.

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This commit is contained in:
Erik C. Thauvin 2021-10-20 22:42:04 -07:00
parent dc3e3896d7
commit 9593799e2a
4 changed files with 97 additions and 54 deletions
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27
bin/dcat.dart
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@ -23,9 +23,9 @@ const showTabsFlag = 'show-tabs';
const squeezeBlankFlag = 'squeeze-blank';
const versionFlag = 'version';
/// Concatenates files specified in [arguments].
///
/// Usage: `dcat [option] [file]…`
// Concatenates file(s) to standard output.
//
// Usage: `dcat [option] [file]…`
Future<int> main(List<String> arguments) async {
exitCode = exitSuccess;
@ -34,8 +34,8 @@ Future<int> main(List<String> arguments) async {
try {
argResults = parser.parse(arguments);
} on FormatException catch (e) {
await printError(
"${e.message}\nTry '$appName --$helpFlag' for more information.");
stderr.writeln('''$appName: ${e.message}
Try '$appName --$helpFlag' for more information.''');
exitCode = exitFailure;
return exitCode;
}
@ -77,8 +77,8 @@ Future<int> main(List<String> arguments) async {
showTabs: showTabs,
squeezeBlank: argResults[squeezeBlankFlag]);
for (final message in result.messages) {
await printError(message);
for (final error in result.errors) {
await printError(error);
}
exitCode = result.exitCode;
@ -87,7 +87,7 @@ Future<int> main(List<String> arguments) async {
return exitCode;
}
/// Setup the command-line arguments parser.
// Sets up the command-line arguments parser.
Future<ArgParser> setupArgsParser() async {
final parser = ArgParser();
@ -124,12 +124,13 @@ Future<ArgParser> setupArgsParser() async {
return parser;
}
/// Prints an error [message] to [stderr].
Future<void> printError(String message) async {
stderr.writeln("$appName: $message");
// Prints an error to stderr.
Future<void> printError(CatError error) async {
stderr.writeln(
'$appName: ' + (error.hasPath ? '${error.path}: ' : '') + error.message);
}
/// Prints the version info.
// Prints the version info.
Future<int> printVersion() async {
stdout.writeln('''$appName (Dart cat) $appVersion
Copyright (C) 2021 Erik C. Thauvin
@ -140,7 +141,7 @@ Source: $homePage''');
return exitSuccess;
}
/// Prints usage with [options].
// Prints the help/usage.
Future<int> usage(String options) async {
stdout.writeln('''Usage: $appName [OPTION]... [FILE]...
Concatenate FILE(s) to standard output.