resize function

src/commands/resize.ts

@@ -0,0 +1,78 @@
+import * as fs from "fs";
+import * as path from "path";
+import sharp from "sharp";
+
+export interface ResizeOperation {
+  files: string[];
+  percentage: number;
+}
+
+export async function resizeImages(
+  files: string[],
+  percentage: number,
+): Promise<void> {
+  try {
+    if (!files || files.length === 0) {
+      throw new Error("no image files specified.");
+    }
+
+    if (percentage <= 0 || percentage > 100) {
+      throw new Error("resize percentage should be between 1 and 100.");
+    }
+
+    const imageExtensions = [".jpg", ".jpeg", ".png", ".gif", ".webp"];
+    const validFiles = files.filter((file) =>
+      imageExtensions.includes(path.extname(file).toLowerCase()),
+    );
+
+    if (validFiles.length === 0) {
+      throw new Error(
+        "no valid image files found in the specified files. resizing was not performed.",
+      );
+    }
+
+    for (const file of validFiles) {
+      if (!fs.existsSync(file)) {
+        throw new Error(`${file} not found. resizing was not performed.`);
+      }
+
+      const image = sharp(file);
+      const metadata = await image.metadata();
+
+      if (!metadata.width || !metadata.height) {
+        throw new Error(
+          `unable to get image size for ${file}. resizing was not performed.`,
+        );
+      }
+
+      const newWidth = Math.round((metadata.width * percentage) / 100);
+      const newHeight = Math.round((metadata.height * percentage) / 100);
+
+      let outputPath = path.join(
+        path.dirname(file),
+        `${path.basename(file, path.extname(file))}_resized${path.extname(file)}`,
+      );
+
+      let counter = 2;
+      while (fs.existsSync(outputPath)) {
+        outputPath = path.join(
+          path.dirname(file),
+          `${path.basename(file, path.extname(file))}_resized_${counter}${path.extname(file)}`,
+        );
+        counter++;
+      }
+
+      await image.resize(newWidth, newHeight).toFile(outputPath);
+    }
+
+    console.log("image resizing completed.");
+  } catch (error: unknown) {
+    if (error instanceof Error) {
+      console.error("error:", error.message);
+      process.exit(1);
+    } else {
+      console.error("unknown error.");
+      process.exit(1);
+    }
+  }
+}