Implement lint

.php-cs-fixer.dist.php

@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * PHP-CS-Fixer config codifying the style already in use under lib/ and
+ * public/. Deliberately NOT based on @PSR2/@PSR12 - this codebase diverges
+ * from those on purpose (tabs, no space before control-structure parens),
+ * so pulling in a preset would rewrite most of the codebase to match a
+ * style nobody uses here. Rules below were derived by sampling lib/*.php,
+ * not from a style guide.
+ */
+
+$finder = (new PhpCsFixer\Finder())
+	->in([__DIR__.'/lib', __DIR__.'/public'])
+	->append([__DIR__.'/config/settings-sample.php'])
+	->name('*.php');
+
+return (new PhpCsFixer\Config())
+	->setIndent("\t")
+	->setLineEnding("\n")
+	->setRules([
+		//Strings: single quotes except where interpolation needs double
+		'single_quote' => true,
+
+		//Arrays: short [] syntax, not long-form array()
+		'array_syntax' => ['syntax' => 'short'],
+
+		//Braces: same line as class/function signature (dominant in lib/,
+		//not the PSR-2 next-line-for-class convention)
+		'braces_position' => [
+			'classes_opening_brace' => 'same_line',
+			'functions_opening_brace' => 'same_line',
+			'anonymous_functions_opening_brace' => 'same_line'
+		],
+
+		//Concatenation: no padding around `.`
+		'concat_space' => ['spacing' => 'none'],
+
+		//true/false/null: lowercase (100% consistent already)
+		'constant_case' => ['case' => 'lower'],
+		'lowercase_keywords' => true,
+
+		'visibility_required' => ['elements' => ['method', 'property', 'const']],
+
+		//Housekeeping - safe regardless of style
+		'no_unused_imports' => true,
+		'no_trailing_whitespace' => true,
+		'no_trailing_whitespace_in_comment' => true,
+		'single_blank_line_at_eof' => true,
+		'no_empty_statement' => true,
+		'trim_array_spaces' => true,
+		'new_with_parentheses' => true
+	])
+	->setFinder($finder);