Use multiline strings

Author: aszady

scala_config.bzl

@@ -11,12 +11,11 @@ def _validate_supported_scala_version(scala_major_version, scala_minor_version):
         fail("Scala version must be newer or equal to 2.12.1 to use compiler dependency tracking.")
 
 def _config_setting(scala_version):
-    return "\n".join([
-        "config_setting(",
-        '    name = "{name}",',
-        '    flag_values = {{":scala_version": "{version}"}},',
-        ")\n",
-    ]).format(name = sanitize_version(scala_version), version = scala_version)
+    return """config_setting(
+    name = "{name}",
+    flag_values = {{":scala_version": "{version}"}},
+)
+""".format(name = sanitize_version(scala_version), version = scala_version)
 
 def _config_settings(scala_versions):
     return "".join([_config_setting(v) for v in scala_versions])
@@ -50,15 +49,14 @@ def _store_config(repository_ctx):
         "ENABLE_COMPILER_DEPENDENCY_TRACKING=" + enable_compiler_dependency_tracking,
     ])
 
-    build_file_content = "\n".join([
-        'load("@bazel_skylib//rules:common_settings.bzl", "string_flag")',
-        "string_flag(",
-        '    name = "scala_version",',
-        '    build_setting_default = "{scala_version}",',
-        "    values = {scala_versions},",
-        '    visibility = ["//visibility:public"],',
-        ")\n",
-    ]).format(scala_versions = scala_versions, scala_version = scala_version)
+    build_file_content = """load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
+string_flag(
+    name = "scala_version",
+    build_setting_default = "{scala_version}",
+    values = {scala_versions},
+    visibility = ["//visibility:public"],
+)
+""".format(scala_versions = scala_versions, scala_version = scala_version)
     build_file_content += _config_settings(scala_versions)
 
     repository_ctx.file("config.bzl", config_file_content)