jotoho/waituntil
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Refactor main method to use commons-cli to parse arguments

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Jonas Tobias Hopusch 2022-03-12 03:16:00 +01:00
parent ddf8047ebd
commit b53e7a617d
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2 changed files with 79 additions and 44 deletions
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23
src/main/java/de/jotoho/waituntil/AppOptions.java Normal file
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@ -0,0 +1,23 @@
package de.jotoho.waituntil;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
final class AppOptions {
// Disable Instance Creation
private AppOptions() {}
public final static Option help =
Option.builder().argName("h").longOpt("help").desc("Shows this help " +
"message and exits").build();
public final static Option version =
Option.builder().argName("v").longOpt("version").desc("Shows version information and exits").build();
private final static Options options = new Options()
.addOption(help)
.addOption(version);
public static Options getOptions() {
return options;
}
}

100
src/main/java/de/jotoho/waituntil/Main.java
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@ -18,8 +18,8 @@ package de.jotoho.waituntil;
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import java.util.HashSet;
import java.util.Map;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.ParseException;
import static de.jotoho.waituntil.GlobalConf.applicationOutputLanguage;
@ -28,53 +28,65 @@ import static de.jotoho.waituntil.GlobalConf.applicationOutputLanguage;
// Author: Jonas Tobias Hopusch (@jotoho)
public final class Main {
public static void main(final String[] args) {
final var optionDictionary = Map.of("-h", "--help", "-v", "--version");
final var options = new HashSet<String>();
final var words = new HashSet<String>();
private static void printVersionInformation() {
final var thisPackage = Main.class.getPackage();
final var appVersion = thisPackage.getImplementationVersion() != null ? thisPackage.getImplementationVersion() : "version unknown";
System.out.println("waituntil " + appVersion);
System.out.println("""
for (final String arg : args) {
if (arg.startsWith("--")) {
options.add(arg.substring(2));
} else if (arg.startsWith("-")) {
if (optionDictionary.containsKey(arg))
options.add(optionDictionary.get(arg).substring(2));
else
System.err.println("Short-hand '$arg' does not exist. Ignoring!");
} else {
words.add(arg);
}
This program is free software: you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.""");
}
private static void printHelpInformation() {
switch (applicationOutputLanguage) {
case GlobalConf.langGerman -> System.out.println("Hilfe kommt noch. (Nicht implementiert)");
default -> System.out.println("Help is yet to come. (Not implemented)");
}
}
if (options.contains("help")) {
switch (applicationOutputLanguage) {
case GlobalConf.langGerman -> System.out.println("Hilfe kommt noch. (Nicht implementiert)");
default -> System.out.println("Help is yet to come. (Not implemented)");
}
} else if (options.contains("version")) {
final var thisPackage = Main.class.getPackage();
final var appVersion = thisPackage.getImplementationVersion() != null
? thisPackage.getImplementationVersion()
: "version unknown";
System.out.println("waituntil " + appVersion);
System.out.println("""
This program is free software: you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.""");
} else if (words.size() == 1) {
final var target = TimeCalculator.calculateAndAnnounceTargetTime(words.iterator().next());
Sleep.waitUntilTimeStamp(target);
} else {
switch (applicationOutputLanguage) {
case GlobalConf.langGerman -> System.err.println("FATAL: Es wurde exact ein nicht-flag Argument erwartet. (" + words.size() + " erhalten)");
default -> System.err.println("FATAL: Expected one non-flag argument. (Got " + words.size() + ")");
public static void main(final String[] args) {
try {
final var parsedArguments =
DefaultParser.builder()
.setStripLeadingAndTrailingQuotes(true)
.build()
.parse(AppOptions.getOptions(), args);
final var userData = parsedArguments.getArgs();
if (parsedArguments.hasOption(AppOptions.help)) {
printHelpInformation();
} else if (parsedArguments.hasOption(AppOptions.version)) {
printVersionInformation();
} else if (userData.length == 0) {
switch (applicationOutputLanguage) {
case GlobalConf.langGerman -> System.err.println("FATAL: Es wurde exact ein nicht-flag Argument erwartet. (" + userData.length + " erhalten)");
default -> System.err.println("FATAL: Expected one non-flag argument. (Got " + userData.length + ")");
}
System.exit(1);
} else if (userData.length > 1) {
switch (applicationOutputLanguage) {
case GlobalConf.langGerman -> System.err.println("FATAL: " +
"Es wurde exact ein nicht-flag Argument erwartet. (" + userData.length + " erhalten)");
default -> System.err.println("FATAL: Expected one " +
"non-flag argument. (Got " + userData.length + ")");
}
System.exit(1);
} else {
final var target =
TimeCalculator.calculateAndAnnounceTargetTime(userData[0]);
Sleep.waitUntilTimeStamp(target);
}
} catch (final ParseException e) {
System.getLogger("main").log(System.Logger.Level.ERROR, "Parsing " +
"of arguments failed and the program cannot continue.", e);
System.exit(1);
}
}