Initial commit for Start9 packaging

workout-planner/lib/formatSets.ts

@@ -0,0 +1,43 @@
+/**
+ * Format an array of sets into a compact grouped summary.
+ *
+ * Consecutive sets with the same weight are collapsed:
+ *   "135 x 5, 185 x 5, 205 x 5, 225 x 3, 245 x 3/3/3"
+ *
+ * When weightUnit is provided (per-set or as a default), it is appended:
+ *   "16kg x 5/5/5" or "245 x 3/3/3" (lbs omitted since it's the common default)
+ *
+ * Sets without weight show just reps; sets without reps are skipped.
+ */
+export function formatSetsSummary(
+  sets: Array<{ weight?: number | null; reps?: number | null; weightUnit?: string | null }>,
+  defaultUnit?: string
+): string {
+  const valid = sets.filter((s) => s.reps);
+  if (valid.length === 0) return "";
+
+  // Group consecutive sets by weight
+  const groups: Array<{ weight: number | null | undefined; weightUnit: string | null | undefined; reps: number[] }> =
+    [];
+
+  for (const s of valid) {
+    const unit = s.weightUnit || defaultUnit || null;
+    const last = groups[groups.length - 1];
+    if (last && last.weight === s.weight && last.weightUnit === unit) {
+      last.reps.push(s.reps!);
+    } else {
+      groups.push({ weight: s.weight, weightUnit: unit, reps: [s.reps!] });
+    }
+  }
+
+  return groups
+    .map((g) => {
+      const repsStr = g.reps.join("/");
+      if (g.weight) {
+        const unit = g.weightUnit === "kg" ? "kg" : "";
+        return `${g.weight}${unit} x ${repsStr}`;
+      }
+      return repsStr;
+    })
+    .join(", ");
+}