troutbot/src/filters.ts

import type { FiltersConfig, WebhookEvent } from './types.js';

export function shouldProcess(
  event: WebhookEvent,
  filters: FiltersConfig
): { pass: boolean; reason?: string } {
  // Label filters
  if (filters.labels.include.length > 0) {
    const hasRequired = event.labels.some((l) => filters.labels.include.includes(l));
    if (!hasRequired) {
      return { pass: false, reason: 'Missing required label' };
    }
  }

  if (filters.labels.exclude.length > 0) {
    const hasExcluded = event.labels.some((l) => filters.labels.exclude.includes(l));
    if (hasExcluded) {
      return { pass: false, reason: 'Has excluded label' };
    }
  }

  // Author filters
  if (filters.authors.include && filters.authors.include.length > 0) {
    if (!filters.authors.include.includes(event.author)) {
      return { pass: false, reason: 'Author not in include list' };
    }
  }

  if (filters.authors.exclude.length > 0) {
    if (filters.authors.exclude.includes(event.author)) {
      return { pass: false, reason: 'Author is excluded' };
    }
  }

  // Branch filters (PRs only)
  if (event.branch && filters.branches.include.length > 0) {
    if (!filters.branches.include.includes(event.branch)) {
      return { pass: false, reason: 'Branch not in include list' };
    }
  }

  return { pass: true };
}