Task: #53687 Handle missing mode fallback and add no-mode cfg tests

bin/cfg

@@ -334,7 +334,7 @@ try {
 	elseif (is_readable($cfgFile = $cfg->buildFileName())) {
 		$cfg->load(require($cfgFile));
 	}
-} catch (Exception $e) {
+} catch (\Throwable $e) {
 	fwrite(STDERR, "Error: ".$e->getMessage().PHP_EOL);
 	exit(1);
 }

src/Settings.php

@@ -159,7 +159,18 @@ class Settings implements \Iterator, \Countable
 			// if a mode was set in the constructor do not overwrite it
 			if (! isset($this->mode)) {
 				// if a localConf Mode is set use it, or take the default conf mode
-				$this->mode = (isset($localConf['mode'])) ? $localConf['mode'] : $this->settings['mode'];
+                // if local/default config has no mode, fall back to the first known mode (normally "prod")
+				if (isset($localConf['mode']) && is_string($localConf['mode']) && $localConf['mode'] !== '') {
+					$this->mode = $localConf['mode'];
+				}
+				elseif (isset($this->settings['mode']) && is_string($this->settings['mode']) && $this->settings['mode'] !== '') {
+					$this->mode = $this->settings['mode'];
+				}
+				else {
+					// Backward-compatible fallback for configs without explicit mode.
+					$this->mode = (string)array_key_first($this->modes);
+					$this->settings['mode'] = $this->mode;
+				}
 			} else {
 				$this->settings['mode'] = $this->mode;
 			}
@@ -358,4 +369,4 @@ class Settings implements \Iterator, \Countable
 
 /* jEdit buffer local properties {{{
   * :folding=explicit:collapseFolds=1:
-}}}*/
+}}}*/

tests/CfgTest.php

@@ -44,6 +44,25 @@ class CfgTest extends TestCase
 		$this->assertSame('218523', $cfg['auth']['projectId']);
 	}
 
+	public function testWriteWithoutModeFallsBackToDefaultMode(): void
+	{
+		file_put_contents(
+			$this->tmpDir.'/config/myCEESV.default.conf.php',
+			"<?php return [\n\t'auth' => [\n\t\t'projectId' => '',\n\t],\n];\n"
+		);
+
+		$result = $this->runCfg([
+			'-a',
+			$this->tmpDir,
+			'write',
+			'myCEESV',
+			'auth:projectId="218523"',
+		]);
+
+		$this->assertSame(0, $result['code'], $result['output']);
+		$this->assertFileExists($this->tmpDir.'/config/myCEESV.conf.php');
+	}
+
 	public function testWriteWithDirectoryNameCreatesAndWritesSiteConfig(): void
 	{
 		$result = $this->runCfg([

tests/SettingsTest.php

@@ -192,6 +192,15 @@ class SettingsTest extends TestCase
 		$cfg = $this->appPath($cfg, 'localOverride')->load();
 		$this->assertEquals(42, $cfg->answer);
 	}
+
+	public function testLoadWithoutModeFallsBackToFirstKnownMode(): void
+	{
+		$cfg = new Settings();
+		$cfg = $this->appPath($cfg, 'noMode')->load();
+
+		$this->assertEquals('prod', $cfg->mode);
+		$this->assertEquals('default', $cfg->testFiles);
+	}
 	
 	/**
 	 * @dataProvider fileNameData

tests/cfg/noMode/config/default.conf.php

@@ -0,0 +1,3 @@
+<?php return [
+	'testFiles' => 'default',
+];