1 files changed, 15 insertions, 2 deletions
diff --git a/src/formats.ts b/src/formats.ts
index b5a24bf..db9a188 100644
--- a/src/formats.ts
+++ b/src/formats.ts
@@ -1,5 +1,7 @@
 interface Format {
-    parse_coverage: (file: Document) => number;
+    // returns the coverage value as %: Number(90.0), Number(100.0), Number(89.5)
+    parse_coverage: (file: Document) => number,
+    match_color: (coverage: number, stage_1: number, stage_2: number) => string,
 }
 
 interface FormatList {
@@ -12,12 +14,23 @@ interface FormatObj {
     get_format: (format: string) => Format,
 }
 
+// color is a gradient from green (>=stage_1) -> yellow (stage_2) -> red. Stage values should come from metadata.
+const default_color_matches = (coverage: number, stage_1: number, stage_2: number) => {
+    const gradient = coverage >= stage_1 ? 15 :
+        (coverage >= stage_2 ?
+            (Math.floor(coverage) - stage_2) * 16 + 15 :
+            240 + Math.floor(coverage / (stage_2 / 15))); 
+    return gradient.toString(16) + "0";
+};
+
 const FormatsObj: FormatObj = {
     formats: {
         tarpaulin: {
             parse_coverage: (file: Document) => {
+                //TODO parse coverage from file (example?)
                 return 0.0;
-            }
+            },
+            match_color: default_color_matches,
         },
     },