refactor(subagents): share formatting helpers

src/shared/subagents-format.ts

@@ -0,0 +1,41 @@
+export function formatDurationCompact(valueMs?: number) {
+  if (!valueMs || !Number.isFinite(valueMs) || valueMs <= 0) {
+    return "n/a";
+  }
+  const minutes = Math.max(1, Math.round(valueMs / 60_000));
+  if (minutes < 60) {
+    return `${minutes}m`;
+  }
+  const hours = Math.floor(minutes / 60);
+  const minutesRemainder = minutes % 60;
+  if (hours < 24) {
+    return minutesRemainder > 0 ? `${hours}h${minutesRemainder}m` : `${hours}h`;
+  }
+  const days = Math.floor(hours / 24);
+  const hoursRemainder = hours % 24;
+  return hoursRemainder > 0 ? `${days}d${hoursRemainder}h` : `${days}d`;
+}
+
+export function formatTokenShort(value?: number) {
+  if (!value || !Number.isFinite(value) || value <= 0) {
+    return undefined;
+  }
+  const n = Math.floor(value);
+  if (n < 1_000) {
+    return `${n}`;
+  }
+  if (n < 10_000) {
+    return `${(n / 1_000).toFixed(1).replace(/\\.0$/, "")}k`;
+  }
+  if (n < 1_000_000) {
+    return `${Math.round(n / 1_000)}k`;
+  }
+  return `${(n / 1_000_000).toFixed(1).replace(/\\.0$/, "")}m`;
+}
+
+export function truncateLine(value: string, maxLength: number) {
+  if (value.length <= maxLength) {
+    return value;
+  }
+  return `${value.slice(0, maxLength).trimEnd()}...`;
+}