feat: added rankings

src/calculateRank.js

@@ -0,0 +1,52 @@
+function calculateRank({
+  totalRepos,
+  totalCommits,
+  contributions,
+  followers,
+  prs,
+  issues,
+  stargazers,
+}) {
+  const COMMITS_OFFSET = 1.65;
+  const CONTRIBS_OFFSET = 1.65;
+  const ISSUES_OFFSET = 1;
+  const STARS_OFFSET = 0.75;
+  const PRS_OFFSET = 0.5;
+  const FOLLOWERS_OFFSET = 0.45;
+
+  const FIRST_STEP = 0;
+  const SECOND_STEP = 5;
+  const THIRD_STEP = 20;
+  const FOURTH_STEP = 50;
+  const FIFTH_STEP = 130;
+
+  // prettier-ignore
+  const score = (
+    totalCommits * COMMITS_OFFSET +
+    contributions * CONTRIBS_OFFSET +
+    issues * ISSUES_OFFSET +
+    stargazers * STARS_OFFSET +
+    prs * PRS_OFFSET +
+    followers * FOLLOWERS_OFFSET
+  ) / totalRepos;
+
+  let level = "";
+
+  if (score == FIRST_STEP) {
+    level = "B";
+  } else if (score > FIRST_STEP && score <= SECOND_STEP) {
+    level = "B+";
+  } else if (score > SECOND_STEP && score <= THIRD_STEP) {
+    level = "A";
+  } else if (score > THIRD_STEP && score <= FOURTH_STEP) {
+    level = "A+";
+  } else if (score > FOURTH_STEP && score <= FIFTH_STEP) {
+    level = "A++";
+  } else if (score > FIFTH_STEP) {
+    level = "S+";
+  }
+
+  return { level, score };
+}
+
+module.exports = calculateRank;