diff --git a/src/.editorconfig b/src/.editorconfig
new file mode 100644
index 000000000..a4dcbcf55
--- /dev/null
+++ b/src/.editorconfig
@@ -0,0 +1,19 @@
+
+root = true
+
+# Default to reasonable settings
+[*]
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+# Ignore external libs
+[/external/**]
+insert_final_newline = unset
+trim_trailing_whitespace = unset
+indent_style = unset
+indent_size = unset
+
+# CMake scripts, including those in the top level of external which we wrote
+[CMakeLists.txt,.cmake,/external/*.cmake]
+indent_style = tab
+indent_size = 4