Introduce multi-commands command line utilities.

[lgpl/argeo-commons.git] / org.argeo.core / src / org / argeo / cli / posix / Echo.java

diff --git a/org.argeo.core/src/org/argeo/cli/posix/Echo.java b/org.argeo.core/src/org/argeo/cli/posix/Echo.java
new file mode 100644 (file)
index 0000000..5746ebd
--- /dev/null
+++ b/org.argeo.core/src/org/argeo/cli/posix/Echo.java
@@ -0,0 +1,46 @@
+package org.argeo.cli.posix;
+
+import java.util.List;
+
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.Option;
+import org.apache.commons.cli.Options;
+import org.argeo.cli.DescribedCommand;
+
+public class Echo implements DescribedCommand<String> {
+
+       @Override
+       public Options getOptions() {
+               Options options = new Options();
+               options.addOption(Option.builder("n").desc("do not output the trailing newline").build());
+               return options;
+       }
+
+       @Override
+       public String getDescription() {
+               return "Display a line of text";
+       }
+
+       @Override
+       public String getUsage() {
+               return "[STRING]...";
+       }
+
+       @Override
+       public String apply(List<String> args) {
+               CommandLine cl = toCommandLine(args);
+
+               StringBuffer sb = new StringBuffer();
+               for (String s : cl.getArgList()) {
+                       sb.append(s).append(' ');
+               }
+
+               if (cl.hasOption('n')) {
+                       sb.deleteCharAt(sb.length() - 1);
+               } else {
+                       sb.setCharAt(sb.length() - 1, '\n');
+               }
+               return sb.toString();
+       }
+
+}