Add support for JSON in metrics commands

Author: romainneutron

src/Model/Metrics/Format.php

@@ -35,19 +35,19 @@ private function formatPercent(?float $pc, bool $warn = true): string
         return \sprintf('%.1f%%', $pc);
     }
 
-    public function format(?float $value, bool $warn = true): string
+    public function format(?float $value, bool $warn = true): string|float|int|null
     {
         if (null === $value) {
-            return '';
+            return null;
         }
 
         if (PHP_INT_MAX === (int) $value) {
             return '∞';
         }
 
         return match ($this) {
-            Format::Rounded => (string) round($value),
-            Format::Rounded2p => (string) round($value, 2),
+            Format::Rounded => round($value),
+            Format::Rounded2p => round($value, 2),
             Format::Percent => $this->formatPercent($value, $warn),
             Format::Disk, Format::Memory => FormatterHelper::formatMemory((int) $value),
         };

src/Service/Table.php

@@ -244,6 +244,10 @@ public function render(array $rows, array $header = [], array $defaultColumns =
                 $this->renderPlain($rows, $header);
                 break;
 
+            case 'json':
+                $this->renderJson($rows, $header);
+                break;
+
             case null:
             case 'table':
                 $this->renderTable($rows, $header);
@@ -263,7 +267,7 @@ public function render(array $rows, array $header = [], array $defaultColumns =
      */
     public function formatIsMachineReadable(): bool
     {
-        return in_array($this->getFormat(), ['csv', 'tsv', 'plain']);
+        return in_array($this->getFormat(), ['csv', 'tsv', 'plain', 'json']);
     }
 
     /**
@@ -384,6 +388,31 @@ protected function renderCsv(array $rows, array $header, string $delimiter = ','
         $this->output->write((new Csv($delimiter, "\n"))->format($rows));
     }
 
+    /**
+     * Renders JSON output.
+     *
+     * @param array<array<int|string, string|int|float|TableCell>|TableSeparator> $rows
+     * @param array<int|string, string|TableCell> $header
+     */
+    protected function renderJson(array $rows, array $header): void
+    {
+        // Remove TableSeparator objects.
+        $rows = array_values(array_filter($rows, '\\is_array'));
+
+        $data = [];
+        foreach ($rows as $row) {
+            $d = [];
+
+            foreach ($header as $k => $h) {
+                $d[$h] = is_scalar($row[$k]) ? $row[$k] : (string) $row[$k];
+            }
+
+            $data[] = $d;
+        }
+
+        $this->output->write(json_encode(['data' => $data], JSON_THROW_ON_ERROR));
+    }
+
     /**
      * Render plain, line-based output.
      *

src/Util/Csv.php

@@ -57,7 +57,7 @@ private function formatRow(array $data): string
      *
      * @return string
      */
-    protected function formatCell(string|\Stringable $cell): string
+    protected function formatCell(string|int|float|null|bool|\Stringable $cell): string
     {
         // Cast cell data to a string.
         $cell = (string) $cell;

src/Util/PlainFormat.php

@@ -17,7 +17,7 @@ public function __construct()
         parent::__construct("\t", "\n");
     }
 
-    protected function formatCell(string|\Stringable $cell): string
+    protected function formatCell(string|int|float|null|bool|\Stringable $cell): string
     {
         // Replace any newline or tab characters with a space.
         return \preg_replace('#[\r\n\t]+#', ' ', (string) $cell);