feat(conan): Ignore Conan files containing Bazel generators

If a Bazel project uses some Conan packages, the corresponding Conan files
should not be picked up by the Conan package manager. Therefore, the Conan
file is checked to NOT contain the BazelDeps and BazelToolchain generators.

Signed-off-by: Nicolas Nobelis <nicolas.nobelis@bosch.com>

Author: nnobelis

plugins/package-managers/conan/src/main/kotlin/Conan.kt

@@ -56,6 +56,7 @@ import org.ossreviewtoolkit.plugins.api.OrtPlugin
 import org.ossreviewtoolkit.plugins.api.OrtPluginOption
 import org.ossreviewtoolkit.plugins.api.PluginDescriptor
 import org.ossreviewtoolkit.utils.common.CommandLineTool
+import org.ossreviewtoolkit.utils.common.alsoIfNull
 import org.ossreviewtoolkit.utils.common.masked
 import org.ossreviewtoolkit.utils.common.safeDeleteRecursively
 import org.ossreviewtoolkit.utils.common.stashDirectories
@@ -149,6 +150,20 @@ class Conan(
 
     private fun hasLockfile(file: String) = File(file).isFile
 
+    /**
+     * If a Bazel project uses some Conan packages, the corresponding Conan files should not be picked up by the Conan
+     * package manager. Therefore, the Conan file is checked to NOT contain the BazelDeps and BazelToolchain generators.
+     */
+    override fun mapDefinitionFiles(analysisRoot: File, definitionFiles: List<File>): List<File> =
+        definitionFiles.mapNotNull { file ->
+            file.takeUnless {
+                val content = it.readText()
+                "BazelDeps" in content || "BazelToolchain" in content
+            }.alsoIfNull {
+                logger.info { "Ignoring definition file '$file' as is used from Bazel." }
+            }
+        }
+
     override fun beforeResolution(
         analysisRoot: File,
         definitionFiles: List<File>,