feat: add CLI for simple template transformation

cli/commands/transform.ts

@@ -0,0 +1,29 @@
+import { readFile, writeFile } from 'node:fs/promises'
+import { parse, stringify } from 'yaml'
+import { addAlarms, addDashboard } from 'slic-watch-core/index'
+import { type SlicWatchConfig, resolveSlicWatchConfig } from 'slic-watch-core/inputs/general-config'
+import { setLogger } from 'slic-watch-core/logging'
+import { cliLogger } from '../lib/cli-logger'
+
+setLogger(cliLogger)
+
+export default async function transform (inputFile: string, outputFile: string) {
+  const outputToJson = outputFile.endsWith('.json')
+  try {
+    const input = await readFile(inputFile)
+    const template = parse(input.toString())
+    const slicWatchConfig: SlicWatchConfig = template.Metadata?.slicWatch ?? {}
+
+    const config = resolveSlicWatchConfig(slicWatchConfig)
+
+    setLogger(cliLogger)
+    addAlarms(config.alarms, config.alarmActionsConfig, template)
+    addDashboard(config.dashboard, template)
+
+    const output = outputToJson ? JSON.stringify(template, null, ' ') : stringify(template)
+    await writeFile(outputFile, output)
+  } catch (err) {
+    cliLogger.error(err)
+    process.exit(1)
+  }
+}

cli/index.ts

@@ -0,0 +1,21 @@
+#!/usr/bin/env node
+
+import { program } from 'commander'
+import transform from './commands/transform'
+
+program
+  .name('slic-watch')
+  .description('SLIC Watch CLI for transforming CloudFormation templates, adding alarms and dashboards')
+  .addHelpText('after', `
+
+  $ slic-watch <input_template> <output_template>
+  `)
+
+program
+  .command('transform', { isDefault: true })
+  .argument('<input_template>', 'Path to the JSON or YAML template to transform')
+  .argument('<output_template>', 'Path for output template')
+  .action(transform)
+
+program
+  .parse()

cli/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "slic-watch-cli",
+  "version": "3.2.1",
+  "description": "CLI for SLIC Watch transformation",
+  "main": "dist/index.js",
+  "bin": "dist/index.js",
+  "scripts": {
+    "test": "tap --include='**/tests/**/*.ts' --coverage-report=lcovonly --allow-incomplete-coverage",
+    "build": "esbuild index.ts --outdir=dist --bundle --format=cjs --platform=node --sourcemap",
+    "watch": "npm run build -- --watch"
+  },
+  "author": "",
+  "license": "Apache-2.0",
+  "dependencies": {
+    "cli-color": "^2.0.4",
+    "commander": "^12.1.0"
+  }
+}