Added getChangelog method with option to set a diff starting point version

Selfupgrade command is now going to prompt you before continuing upgrading and optionally can show the change log
Added -y|--all-yes option in grav self upgrade command to skip any prompt and just upgrade

system/src/Grav/Common/GPM/Remote/Grav.php

@@ -9,6 +9,10 @@ class Grav extends Collection
     private $version;
     private $date;
 
+    /**
+     * @param bool $refresh
+     * @param null $callback
+     */
     public function __construct($refresh = false, $callback = null)
     {
         parent::__construct($this->repository);
@@ -19,9 +23,7 @@ class Grav extends Collection
         $this->version = @$this->data->version ?: '-';
         $this->date = @$this->data->date ?: '-';
 
-        $this->data = $this->data->assets;
-
-        foreach ($this->data as $slug => $data) {
+        foreach ($this->data->assets as $slug => $data) {
             $this->items[$slug] = new Package($data);
         }
     }
@@ -32,7 +34,31 @@ class Grav extends Collection
      */
     public function getAssets()
     {
-        return $this->data;
+        return $this->data->assets;
+    }
+
+    /**
+     * Returns the changelog list for each version of Grav
+     * @param string $diff the version number to start the diff from
+     *
+     * @return array changelog list for each version
+     */
+    public function getChangelog($diff = null)
+    {
+        if (!$diff) {
+            return $this->data->changelog;
+        }
+
+        $diffLog = [];
+        foreach ($this->data->changelog as $version => $changelog) {
+            preg_match("/[\d\.]+/", $version, $cleanVersion);
+
+            if (!$cleanVersion || version_compare($diff, $cleanVersion[0], ">=")) { continue; }
+
+            $diffLog[$version] = $changelog;
+        }
+
+        return $diffLog;
     }
 
     /**

system/src/Grav/Common/GPM/Upgrader.php

@@ -64,6 +64,17 @@ class Upgrader
         return $this->remote->getAssets();
     }
 
+    /**
+     * Returns the changelog list for each version of Grav
+     * @param string $diff the version number to start the diff from
+     *
+     * @return array return the chagenlog list for each version
+     */
+    public function getChangelog($diff = null)
+    {
+        return $this->remote->getChangelog($diff);
+    }
+
     /**
      * Checks if the currently installed Grav is upgradable to a newer version
      * @return boolean True if it's upgradable, False otherwise.

system/src/Grav/Console/Gpm/SelfupgradeCommand.php

@@ -10,6 +10,7 @@ use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Question\ConfirmationQuestion;
 
 class SelfupgradeCommand extends Command
 {
@@ -32,6 +33,12 @@ class SelfupgradeCommand extends Command
                 InputOption::VALUE_NONE,
                 'Force re-fetching the data from remote'
             )
+            ->addOption(
+                'all-yes',
+                'y',
+                InputOption::VALUE_NONE,
+                'Assumes yes (or best approach) instead of prompting'
+            )
             ->setDescription("Detects and performs an update of plugins and themes when available")
             ->setHelp('The <info>update</info> command updates plugins and themes when a new version is available');
     }
@@ -51,7 +58,49 @@ class SelfupgradeCommand extends Command
             exit;
         }
 
-        $this->output->writeln("Preparing to upgrade Grav to v<cyan>" . $remote . "</cyan> [release date: " . $release . "]");
+        $questionHelper = $this->getHelper('question');
+        $skipPrompt     = $this->input->getOption('all-yes');
+
+        $this->output->writeln("Grav v<cyan>$remote</cyan> is now available [release date: $release].");
+        $this->output->writeln("You are currently using v<cyan>".GRAV_VERSION."</cyan>.");
+
+        if (!$skipPrompt) {
+            $question = new ConfirmationQuestion("Would you like to upgrade now? [y|N] ", false);
+            $answer   = $questionHelper->ask($this->input, $this->output, $question);
+
+            if (!$answer) {
+                $this->output->writeln("Aborting...");
+
+                exit;
+            }
+
+            $question = new ConfirmationQuestion("Would you like to read the changelog before proceeding? [y|N] ", false);
+            $answer   = $questionHelper->ask($this->input, $this->output, $question);
+
+            if ($answer) {
+                $changelog = $this->upgrader->getChangelog(GRAV_VERSION);
+
+                $this->output->writeln("");
+                foreach ($changelog as $version => $log) {
+                    $title = $version . ' [' . $log->date . ']';
+                    $content = preg_replace_callback("/\d\.\s\[\]\(#(.*)\)/", function($match){
+                        return "\n".ucfirst($match[1]).":";
+                    }, $log->content);
+
+                    $this->output->writeln($title);
+                    $this->output->writeln(str_repeat('-', strlen($title)));
+                    $this->output->writeln($content);
+                    $this->output->writeln("");
+                }
+
+                $question = new ConfirmationQuestion("Press [ENTER] to continue.", true);
+                $questionHelper->ask($this->input, $this->output, $question);
+            }
+
+        }
+
+        $this->output->writeln("");
+        $this->output->writeln("Preparing to upgrade to v<cyan>$remote</cyan>..");
 
         $this->output->write("  |- Downloading upgrade [" . $this->formatBytes($update->size) . "]...     0%");
         $this->file = $this->download($update);