📂 Add new directory for image-scale-cli tool

image-scale-cli/src/saver.ts

@@ -0,0 +1,55 @@
+import type sharp from "sharp";
+import { getFormat } from "./loader.ts";
+
+export interface SaveOptions {
+  quality?: number;
+  compressionLevel?: number;
+}
+
+/**
+ * Save a sharp instance to a file with format-specific options
+ */
+export async function saveImage(
+  image: sharp.Sharp,
+  outputPath: string,
+  options: SaveOptions = {}
+): Promise<string> {
+  const { quality = 85, compressionLevel = 6 } = options;
+  const format = getFormat(outputPath);
+
+  let processed: sharp.Sharp;
+
+  switch (format) {
+    case "jpeg":
+      processed = image.jpeg({ quality });
+      break;
+    case "png":
+      processed = image.png({ compressionLevel });
+      break;
+    case "webp":
+      processed = image.webp({ quality });
+      break;
+    case "gif":
+      processed = image.gif();
+      break;
+    default:
+      throw new Error(`Unsupported output format: ${format}`);
+  }
+
+  await processed.toFile(outputPath);
+  return outputPath;
+}
+
+/**
+ * Determine output path based on input and options
+ */
+export function determineOutputPath(
+  inputPath: string,
+  explicitOutput?: string
+): string {
+  if (explicitOutput) {
+    return explicitOutput;
+  }
+  // Default: add -scaled suffix before extension
+  return inputPath.replace(/\.[^.]+$/, `-scaled${inputPath.match(/\.[^.]+$/)?.[0] || ""}`);
+}