Merge pull request github#13373 from igfoo/igfoo/kotlin-loc

Java/Kotlin: Split lines of code by language

Author: igfoo

java/ql/src/Metrics/Summaries/LinesOfCode.ql

@@ -1,8 +1,8 @@
 /**
  * @id java/summary/lines-of-code
  * @name Total lines of Java code in the database
- * @description The total number of lines of code across all files. This is a useful metric of the size of a database.
- *              For all files that were seen during the build, this query counts the lines of code, excluding whitespace
+ * @description The total number of lines of code across all Java files. This is a useful metric of the size of a database.
+ *              For all Java files that were seen during the build, this query counts the lines of code, excluding whitespace
  *              or comments.
  * @kind metric
  * @tags summary
@@ -11,4 +11,4 @@
 
 import java
 
-select sum(CompilationUnit f | f.fromSource() | f.getNumberOfLinesOfCode())
+select sum(CompilationUnit f | f.fromSource() and f.isJavaSourceFile() | f.getNumberOfLinesOfCode())

java/ql/src/Metrics/Summaries/LinesOfCodeKotlin.ql

@@ -0,0 +1,18 @@
+/**
+ * @id java/summary/lines-of-code-kotlin
+ * @name Total lines of Kotlin code in the database
+ * @description The total number of lines of code across all Kotlin files. This is a useful metric of the size of a database.
+ *              For all Kotlin files that were seen during the build, this query counts the lines of code, excluding whitespace
+ *              or comments.
+ * @kind metric
+ * @tags summary
+ *       lines-of-code
+ */
+
+import java
+
+select sum(CompilationUnit f |
+    f.fromSource() and f.isKotlinSourceFile()
+  |
+    f.getNumberOfLinesOfCode()
+  )

java/ql/src/change-notes/2023-06-05-lines-of-code.md

@@ -0,0 +1,4 @@
+---
+category: minorAnalysis
+---
+* The `java/summary/lines-of-code` query now only counts lines of Java code. The new `java/summary/lines-of-code-kotlin` counts lines of Kotlin code.