ShowCommands.java

/*
 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0 which is available at
 * https://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.eclipse.jgit.pgm.debug;

import java.io.IOException;
import java.net.URL;

import org.eclipse.jgit.pgm.Command;
import org.eclipse.jgit.pgm.CommandCatalog;
import org.eclipse.jgit.pgm.CommandRef;
import org.eclipse.jgit.pgm.TextBuiltin;
import org.eclipse.jgit.pgm.internal.CLIText;
import org.eclipse.jgit.util.io.ThrowingPrintWriter;
import org.kohsuke.args4j.Option;

@Command(usage = "usage_displayAListOfAllRegisteredJgitCommands")
class ShowCommands extends TextBuiltin {
    @Option(name = "--pretty", metaVar = "metaVar_commandDetail", usage = "usage_alterTheDetailShown")
    private Format pretty = Format.USAGE;

    /** {@inheritDoc} */
    @Override
    protected void run() throws Exception {
        final CommandRef[] list = CommandCatalog.all();

        int width = 0;
        for (CommandRef c : list)
            width = Math.max(width, c.getName().length());
        width += 2;

        for (CommandRef c : list) {
            errw.print(c.isCommon() ? '*' : ' ');
            errw.print(' ');

            errw.print(c.getName());
            for (int i = c.getName().length(); i < width; i++)
                errw.print(' ');

            pretty.print(errw, c);
            errw.println();
        }
        errw.println();
    }

    enum Format {
        /** */
        USAGE {
            @Override
            void print(ThrowingPrintWriter err, CommandRef c) throws IOException {
                String usage = c.getUsage();
                if (usage != null && usage.length() > 0)
                    err.print(CLIText.get().resourceBundle().getString(usage));
            }
        },

        /** */
        CLASSES {
            @Override
            void print(ThrowingPrintWriter err, CommandRef c) throws IOException {
                err.print(c.getImplementationClassName());
            }
        },

        /** */
        URLS {
            @Override
            void print(ThrowingPrintWriter err, CommandRef c) throws IOException {
                final ClassLoader ldr = c.getImplementationClassLoader();

                String cn = c.getImplementationClassName();
                cn = cn.replace('.', '/') + ".class"; //$NON-NLS-1$

                final URL url = ldr.getResource(cn);
                if (url == null) {
                    err.print(CLIText.get().notFound);
                    return;
                }

                String rn = url.toExternalForm();
                if (rn.endsWith(cn))
                    rn = rn.substring(0, rn.length() - cn.length());

                err.print(rn);
            }
        };

        abstract void print(ThrowingPrintWriter err, CommandRef c) throws IOException;
    }
}