builder:ReadmeWriter: added

Doesn't support including disabled rules yet.

builder/src/main/java/net/kemitix/checkstyle/ruleset/builder/ReadmeWriter.java

@@ -0,0 +1,123 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2016 Paul Campbell
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+package net.kemitix.checkstyle.ruleset.builder;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.stereotype.Component;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+import java.util.Comparator;
+import java.util.Locale;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+
+/**
+ * Writes the README file.
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net)
+ */
+@Component
+@RequiredArgsConstructor
+class ReadmeWriter implements CommandLineRunner {
+
+    private static final String NEWLINE = "\n";
+
+    private final TemplateProperties templateProperties;
+
+    private final OutputProperties outputProperties;
+
+    private final RulesProperties rulesProperties;
+
+    private final RuleReadmeLoader ruleReadmeLoader;
+
+    @Override
+    public void run(final String... args) throws Exception {
+        final String readmeTemplate = readFile(templateProperties.getReadmeTemplate());
+        final String index = ruleIndex();
+        final String enabledCheckstyle = readmeRules(this::isEnabledCheckstyleRule);
+        final String enabledSevntu = readmeRules(this::isEnabledSevntuRule);
+        final String disabledCheckstyle = readmeRules(this::isDisabledCheckstyleRule);
+        final String disabledSevntu = readmeRules(this::isDisabledSevntuRule);
+        final byte[] readme = String.format(readmeTemplate, index, enabledCheckstyle, enabledSevntu, disabledCheckstyle,
+                                            disabledSevntu
+                                           )
+                                    .getBytes(StandardCharsets.UTF_8);
+        Files.write(outputProperties.getReadme(), readme, StandardOpenOption.TRUNCATE_EXISTING);
+    }
+
+    private String ruleIndex() {
+        return rulesProperties.getRules()
+                              .stream()
+                              .sorted(Comparator.comparing(rule -> rule.getName().toLowerCase(Locale.ENGLISH)))
+                              .map(this::formatRuleIndex)
+                              .collect(Collectors.joining(NEWLINE));
+    }
+
+    private String formatRuleIndex(final Rule rule) {
+        final String ruleLink = rule.getName()
+                                    .toLowerCase(Locale.ENGLISH);
+        final String source = rule.getSource()
+                                  .toString()
+                                  .toLowerCase(Locale.ENGLISH);
+        final String enabled = rule.isEnabled() ? "enabled" : "disabled";
+        final String insuppressible = rule.isInsuppressible() ? " - insuppressible" : "";
+        return String.format("* [%s](#%s) - %s - %s%s", rule.getName(), ruleLink, source, enabled, insuppressible);
+    }
+
+    private boolean isEnabledSevntuRule(final Rule rule) {
+        return rule.isEnabled() && RuleSource.SEVNTU.equals(rule.getSource());
+    }
+
+    private boolean isEnabledCheckstyleRule(final Rule rule) {
+        return rule.isEnabled() && RuleSource.CHECKSTYLE.equals(rule.getSource());
+    }
+
+    private boolean isDisabledSevntuRule(final Rule rule) {
+        return !rule.isEnabled() && RuleSource.SEVNTU.equals(rule.getSource());
+    }
+
+    private boolean isDisabledCheckstyleRule(final Rule rule) {
+        return !rule.isEnabled() && RuleSource.CHECKSTYLE.equals(rule.getSource());
+    }
+
+    private String readmeRules(final Predicate<Rule> predicate) {
+        return rulesProperties.getRules()
+                              .stream()
+                              .filter(predicate)
+                              .flatMap(ruleReadmeLoader::load)
+                              .collect(Collectors.joining(NEWLINE));
+    }
+
+    private String readFile(final Path file) throws IOException {
+        return Files.lines(file, StandardCharsets.UTF_8)
+                    .collect(Collectors.joining(NEWLINE));
+    }
+
+}