add methods for command output

src/ComposerReader.php

@@ -51,6 +51,7 @@ public function canWrite(): bool
         if ($this->isProvidedAsJsonArray()) {
             return false;
         }
+
         return is_file($this->file) && is_writable($this->file);
     }
 
@@ -156,6 +157,62 @@ public function removeSection($section)
         $this->_content = $content;
     }
 
+    private ?string $_commandOutput = null;
+
+    private ?int $_commandStatus = null;
+
+    public function createCommand(string $command, ?string $folder = null): self
+    {
+        $this->_commandOutput = null;
+        $this->_commandStatus = null;
+
+        $olddir = null;
+        if ($folder === null) {
+            $folder = dirname($this->file);
+            $olddir = getcwd();
+        }
+
+        chdir($folder);
+
+        // Execute the command and capture its full output
+        $outputLines = [];
+        $status = null;
+        exec('composer ' . $command . ' 2>&1', $outputLines, $status);
+
+        // Store full output in case of failure
+        if ($status !== 0) {
+            // Failure: Keep all lines
+            $this->_commandOutput = implode("\n", $outputLines);
+        } else {
+            // Success: Keep only the last non-empty line
+            $filteredLines = array_filter($outputLines); // Remove empty lines
+            $this->_commandOutput = trim(end($filteredLines)); // Get last non-empty line
+        }
+
+        $this->_commandStatus = $status;
+
+        if ($olddir !== null) {
+            chdir($olddir);
+        }
+
+        return $this;
+    }
+
+    public function commandIsSuccessful(): bool
+    {
+        return $this->getCommandStatus() === 0;
+    }
+
+    public function getCommandOutput(): ?string
+    {
+        return trim($this->_commandOutput);
+    }
+
+    public function getCommandStatus(): ?int
+    {
+        return $this->_commandStatus;
+    }
+
     /**
      * Run a composer command in the given composer.json.
      *
@@ -171,17 +228,7 @@ public function removeSection($section)
      */
     public function runCommand($command)
     {
-        $folder = dirname($this->file);
-        $olddir = getcwd();
-        chdir($folder);
-
-        ob_start();
-        $output = null;
-        $cmd = system('composer ' . $command, $output);
-        $output = ob_end_clean();
-        chdir($olddir);
-
-        return $cmd !== false;
+        return $this->createCommand($command)->commandIsSuccessful();
     }
 
     /**

tests/ComposerReaderTest.php

@@ -106,6 +106,23 @@ public function testRunCommand()
 
         $this->assertTrue($r);
     }
+
+    public function testRunCommandOutput()
+    {
+        $reader = new ComposerReader($this->getWorkingComposerJson());
+
+        $this->assertTrue($reader->canRead());
+
+        $cmd = $reader->createCommand('dumpautoload');
+        $this->assertTrue($cmd->commandIsSuccessful());
+        $this->assertSame($cmd->getCommandOutput(), 'Generated autoload files');
+        $this->assertSame($cmd->getCommandStatus(), 0);
+
+        $cmdError = $reader->createCommand('dumpautoload --no-such-option');
+        $this->assertFalse($cmdError->commandIsSuccessful());
+        $this->assertSame($cmdError->getCommandStatus(), 1);
+        $this->assertStringContainsString('tion does not ex', $cmdError->getCommandOutput());
+    }
 
     public function testRemove()
     {