Clear up selection of the target branch when it does not already exist

src/Command/Environment/EnvironmentPushCommand.php

@@ -23,7 +23,7 @@ protected function configure()
             ->setAliases(['push'])
             ->setDescription('Push code to an environment')
             ->addArgument('source', InputArgument::OPTIONAL, 'The source ref: a branch name or commit hash', 'HEAD')
-            ->addOption('target', null, InputOption::VALUE_REQUIRED, 'The target branch name')
+            ->addOption('target', null, InputOption::VALUE_REQUIRED, 'The target branch name. Defaults to the current branch.')
             ->addOption('force', 'f', InputOption::VALUE_NONE, 'Allow non-fast-forward updates')
             ->addOption('force-with-lease', null, InputOption::VALUE_NONE, 'Allow non-fast-forward updates, if the remote-tracking branch is up to date')
             ->addOption('set-upstream', 'u', InputOption::VALUE_NONE, 'Set the target environment as the upstream for the source branch')
@@ -98,11 +98,20 @@ protected function execute(InputInterface $input, OutputInterface $output)
             $target = $input->getOption('target');
         } elseif ($this->hasSelectedEnvironment()) {
             $target = $this->getSelectedEnvironment()->id;
-        } elseif ($currentBranch = $git->getCurrentBranch()) {
-            $target = $currentBranch;
         } else {
-            $this->stdErr->writeln('Could not determine target environment name.');
-            return 1;
+            $allEnvironments = $this->api()->getEnvironments($project);
+            $currentBranch = $git->getCurrentBranch();
+            if ($currentBranch !== false && isset($allEnvironments[$currentBranch])) {
+                $target = $currentBranch;
+            } else {
+                $default = $currentBranch !== false ? $currentBranch : null;
+                $this->stdErr->writeln('Pushing to a new branch will create a new environment (inactive, by default).');
+                $target = $questionHelper->askInput('Enter the target branch name', $default, array_keys($allEnvironments));
+                if ($target === null) {
+                    $this->stdErr->writeln('A target branch name (<error>--target</error>) is required.');
+                    return 1;
+                }
+            }
         }
 
         /** @var Environment|false $targetEnvironment The target environment, which may not exist yet. */
@@ -114,7 +123,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             $questionText = sprintf(
                 'Are you sure you want to push to the %s branch?',
                 $targetEnvironment
-                        ? $this->api()->getEnvironmentLabel($targetEnvironment, 'comment')
+                        ? $this->api()->getEnvironmentLabel($targetEnvironment, 'comment', false)
                         : '<comment>' . $target . '</comment>'
             );
             if (!$questionHelper->confirm($questionText)) {