erik/dcat
erik/dcat
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Rewrote data parsing using streams.

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This commit is contained in:
Erik C. Thauvin 2021-10-16 00:54:06 -07:00
parent 42afc67d46
commit 4ee7ec2127
6 changed files with 273 additions and 223 deletions
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114
bin/dcat.dart
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@ -11,8 +11,8 @@ import 'package:indent/indent.dart';
const appName = 'dcat';
const appVersion = '1.0.0';
const helpFlag = 'help';
const nonBlankFlag = 'number-nonblank';
const numberFlag = 'number';
const numberNonBlank = 'number-nonblank';
const showAllFlag = 'show-all';
const showEndsFlag = 'show-ends';
const showNonPrintingEndsFlag = 'show-nonprinting-ends';
@ -26,13 +26,71 @@ const versionFlag = 'version';
///
/// Usage: `dcat [option] [file]…`
Future<int> main(List<String> arguments) async {
final parser = ArgParser();
exitCode = exitSuccess;
final parser = await setupArgsParser();
final ArgResults argResults;
try {
argResults = parser.parse(arguments);
} on FormatException catch (e) {
return printError(
"${e.message}\nTry '$appName --$helpFlag' for more information.");
}
if (argResults[helpFlag]) {
exitCode = await usage(parser.usage);
} else if (argResults[versionFlag]) {
exitCode = await printVersion();
} else {
final paths = argResults.rest;
var showEnds = argResults[showEndsFlag];
var showTabs = argResults[showTabsFlag];
var showLineNumbers = argResults[numberFlag];
var showNonBlank = argResults[numberNonBlank];
var showNonPrinting = argResults[showNonPrintingFlag];
if (argResults[showNonPrintingEndsFlag]) {
showNonPrinting = showEnds = true;
}
if (argResults[showNonPrintingTabsFlag]) {
showNonPrinting = showTabs = true;
}
if (argResults[showAllFlag]) {
showNonPrinting = showEnds = showTabs = true;
}
if (showNonBlank) {
showLineNumbers = true;
}
final result = await cat(paths, stdout,
input: stdin,
showEnds: showEnds,
showLineNumbers: showLineNumbers,
numberNonBlank: showNonBlank,
showTabs: showTabs,
squeezeBlank: argResults[squeezeBlank],
showNonPrinting: showNonPrinting);
for (final message in result.messages) {
await printError(message);
}
exitCode = result.exitCode;
}
return exitCode;
}
/// Setup the command-line arguments parser.
Future<ArgParser> setupArgsParser() async {
final parser = ArgParser();
parser.addFlag(showAllFlag,
negatable: false, abbr: 'A', help: 'equivalent to -vET');
parser.addFlag(nonBlankFlag,
parser.addFlag(numberNonBlank,
negatable: false,
abbr: 'b',
help: 'number nonempty output lines, overrides -n');
@ -60,53 +118,7 @@ Future<int> main(List<String> arguments) async {
abbr: 'v',
help: 'use ^ and U+ notation, except for LFD and TAB');
final ArgResults argResults;
try {
argResults = parser.parse(arguments);
} on FormatException catch (e) {
return printError(
"${e.message}\nTry '$appName --$helpFlag' for more information.");
}
if (argResults[helpFlag]) {
exitCode = await usage(parser.usage);
} else if (argResults[versionFlag]) {
exitCode = await printVersion();
} else {
final paths = argResults.rest;
var showEnds = argResults[showEndsFlag];
var showTabs = argResults[showTabsFlag];
var showNonPrinting = argResults[showNonPrintingFlag];
if (argResults[showNonPrintingEndsFlag]) {
showNonPrinting = showEnds = true;
}
if (argResults[showNonPrintingTabsFlag]) {
showNonPrinting = showTabs = true;
}
if (argResults[showAllFlag]) {
showNonPrinting = showEnds = showTabs = true;
}
final result = await cat(paths, stdout,
input: stdin,
showEnds: showEnds,
showLineNumbers: argResults[numberFlag],
numberNonBlank: argResults[nonBlankFlag],
showTabs: showTabs,
squeezeBlank: argResults[squeezeBlank],
showNonPrinting: showNonPrinting);
for (final message in result.messages) {
await printError(message);
}
exitCode = result.exitCode;
}
return exitCode;
return parser;
}
/// Prints the error [message] to [stderr].