protected int run()

in core/src/main/java/hudson/cli/InstallPluginCommand.java [84:169]
73 lines of code
19 McCabe index (conditional complexity)

    protected int run() throws Exception {
        Jenkins h = Jenkins.get();
        h.checkPermission(Jenkins.ADMINISTER);
        PluginManager pm = h.getPluginManager();

        if (name != null) {
            stderr.println("-name is deprecated; it is no longer necessary nor honored.");
        }

        for (String source : sources) {
            if (source.equals("=")) {
                stdout.println(Messages.InstallPluginCommand_InstallingPluginFromStdin());
                File f = getTmpFile();
                FileUtils.copyInputStreamToFile(stdin, f);
                f = moveToFinalLocation(f);
                if (dynamicLoad) {
                    pm.dynamicLoad(f);
                }
                continue;
            }

            // is this an URL?
            try {
                URL u = new URL(source);
                stdout.println(Messages.InstallPluginCommand_InstallingPluginFromUrl(u));
                File f = getTmpFile();
                FileUtils.copyURLToFile(u, f); // TODO JENKINS-58248 proxy
                f = moveToFinalLocation(f);
                if (dynamicLoad) {
                    pm.dynamicLoad(f);
                }
                continue;
            } catch (MalformedURLException e) {
                // not an URL
            }

            // is this a plugin the update center?
            int index = source.lastIndexOf(':');
            UpdateSite.Plugin p;
            if (index == -1) {
                p = h.getUpdateCenter().getPlugin(source);
            } else {
                // try to find matching min version number
                VersionNumber version = new VersionNumber(source.substring(index + 1));
                p = h.getUpdateCenter().getPlugin(source.substring(0,index), version);
                if (p == null) {
                    p = h.getUpdateCenter().getPlugin(source);
                }
            }
            if (p!=null) {
                stdout.println(Messages.InstallPluginCommand_InstallingFromUpdateCenter(source));
                Throwable e = p.deploy(dynamicLoad).get().getError();
                if (e!=null) {
                    AbortException myException = new AbortException("Failed to install plugin " + source);
                    myException.initCause(e);
                    throw myException;
                }
                continue;
            }

            stdout.println(Messages.InstallPluginCommand_NotAValidSourceName(source));

            if (!source.contains(".") && !source.contains(":") && !source.contains("/") && !source.contains("\\")) {
                // looks like a short plugin name. Why did we fail to find it in the update center?
                if (h.getUpdateCenter().getSites().isEmpty()) {
                    stdout.println(Messages.InstallPluginCommand_NoUpdateCenterDefined());
                } else {
                    Set<String> candidates = new HashSet<>();
                    for (UpdateSite s : h.getUpdateCenter().getSites()) {
                        Data dt = s.getData();
                        if (dt==null)
                            stdout.println(Messages.InstallPluginCommand_NoUpdateDataRetrieved(s.getUrl()));
                        else
                            candidates.addAll(dt.plugins.keySet());
                    }
                    stdout.println(Messages.InstallPluginCommand_DidYouMean(source,EditDistance.findNearest(source,candidates)));
                }
            }

            throw new AbortException("Error occurred, see previous output.");
        }

        if (restart)
            h.safeRestart();
        return 0; // all success
    }