X-Git-Url: http://git.argeo.org/?p=lgpl%2Fargeo-commons.git;a=blobdiff_plain;f=org.argeo.cms%2Fsrc%2Forg%2Fargeo%2Fapi%2Fcli%2FDescribedCommand.java;fp=org.argeo.cms%2Fsrc%2Forg%2Fargeo%2Fapi%2Fcli%2FDescribedCommand.java;h=51cb2cecaa2558698d63a30d89d7a479fbda71a6;hp=0000000000000000000000000000000000000000;hb=40f2d6712d120dd62a42b7db3a6f074ce49c83d4;hpb=c7b612ca9bd7df43b0bec37c8abcae846587c978

diff --git a/org.argeo.cms/src/org/argeo/api/cli/DescribedCommand.java b/org.argeo.cms/src/org/argeo/api/cli/DescribedCommand.java
new file mode 100644
index 000000000..51cb2ceca
--- /dev/null
+++ b/org.argeo.cms/src/org/argeo/api/cli/DescribedCommand.java
@@ -0,0 +1,60 @@
+package org.argeo.api.cli;
+
+import java.io.StringWriter;
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Function;
+
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.DefaultParser;
+import org.apache.commons.cli.Options;
+import org.apache.commons.cli.ParseException;
+
+/** A command that can be described. */
+public interface DescribedCommand<T> extends Function<List<String>, T> {
+	default Options getOptions() {
+		return new Options();
+	}
+
+	String getDescription();
+
+	default String getUsage() {
+		return null;
+	}
+
+	default String getExamples() {
+		return null;
+	}
+
+	default CommandLine toCommandLine(List<String> args) {
+		try {
+			DefaultParser parser = new DefaultParser();
+			return parser.parse(getOptions(), args.toArray(new String[args.size()]));
+		} catch (ParseException e) {
+			throw new CommandArgsException(e);
+		}
+	}
+
+	/** In order to implement quickly a main method. */
+	public static void mainImpl(DescribedCommand<?> command, String[] args) {
+		try {
+			Object output = command.apply(Arrays.asList(args));
+			System.out.println(output);
+			System.exit(0);
+		} catch (PrintHelpRequestException e) {
+			StringWriter out = new StringWriter();
+			HelpCommand.printHelp(command, out);
+			System.out.println(out.toString());
+			System.exit(1);
+		} catch (IllegalArgumentException e) {
+			StringWriter out = new StringWriter();
+			HelpCommand.printHelp(command, out);
+			System.err.println(out.toString());
+			System.exit(1);
+		} catch (Exception e) {
+			e.printStackTrace();
+			System.exit(1);
+		}
+	}
+
+}