Backend: Dekekt (#2547)

Co-authored-by: Linnea Gräf <nea@nea.moe>
Co-authored-by: hannibal2 <24389977+hannibal00212@users.noreply.github.com>
Co-authored-by: Cal <cwolfson58@gmail.com>

2 files changed, 68 insertions, 0 deletions

diff --git a/detekt/src/main/kotlin/formatting/CustomCommentSpacing.kt b/detekt/src/main/kotlin/formatting/CustomCommentSpacing.kt
new file mode 100644
index 000000000..aaf7896cf
--- /dev/null
+++ b/detekt/src/main/kotlin/formatting/CustomCommentSpacing.kt
@@ -0,0 +1,51 @@
+package at.hannibal2.skyhanni.detektrules.formatting
+
+import io.gitlab.arturbosch.detekt.api.CodeSmell
+import io.gitlab.arturbosch.detekt.api.Config
+import io.gitlab.arturbosch.detekt.api.Debt
+import io.gitlab.arturbosch.detekt.api.Entity
+import io.gitlab.arturbosch.detekt.api.Issue
+import io.gitlab.arturbosch.detekt.api.Rule
+import io.gitlab.arturbosch.detekt.api.Severity
+import org.jetbrains.kotlin.com.intellij.psi.PsiComment
+
+class CustomCommentSpacing(config: Config) : Rule(config) {
+    override val issue = Issue(
+        "CustomCommentSpacing",
+        Severity.Style,
+        "Enforces custom spacing rules for comments.",
+        Debt.FIVE_MINS
+    )
+
+    private val allowedPatterns = listOf(
+        "#if",
+        "#else",
+        "#elseif",
+        "#endif",
+        "$$"
+    )
+
+    override fun visitComment(comment: PsiComment) {
+        if (allowedPatterns.any { comment.text.contains(it) }) {
+            return
+        }
+
+        /**
+         * REGEX-TEST: // Test comment
+         * REGEX-TEST: /* Test comment */
+         */
+        val commentRegex = Regex("""^(?:\/{2}|\/\*)(?:\s.*|$)""", RegexOption.DOT_MATCHES_ALL)
+        if (!commentRegex.matches(comment.text)) {
+            report(
+                CodeSmell(
+                    issue,
+                    Entity.from(comment),
+                    "Expected space after opening comment."
+                )
+            )
+        }
+
+        // Fallback to super (ostensibly a no-check)
+        super.visitComment(comment)
+    }
+}
diff --git a/detekt/src/main/kotlin/formatting/FormattingRuleSetProvider.kt b/detekt/src/main/kotlin/formatting/FormattingRuleSetProvider.kt
new file mode 100644
index 000000000..a0a969bcf
--- /dev/null
+++ b/detekt/src/main/kotlin/formatting/FormattingRuleSetProvider.kt
@@ -0,0 +1,17 @@
+package at.hannibal2.skyhanni.detektrules.formatting
+
+import com.google.auto.service.AutoService
+import io.gitlab.arturbosch.detekt.api.Config
+import io.gitlab.arturbosch.detekt.api.RuleSet
+import io.gitlab.arturbosch.detekt.api.RuleSetProvider
+
+@AutoService(RuleSetProvider::class)
+class FormattingRuleSetProvider : RuleSetProvider {
+    override val ruleSetId: String = "FormattingRules"
+
+    override fun instance(config: Config): RuleSet {
+        return RuleSet(ruleSetId, listOf(
+            CustomCommentSpacing(config)
+        ))
+    }
+}