feat: Support generation of assets to plain Buffers.

src/lib/index.js

@@ -15,22 +15,50 @@ const generateAssetDestination = (outputDirectory, template, format) => {
     return path.join(outputDirectory, path.basename(template.name, path.extname(template.name)) + "." + format);
 };
 
-const generateImageForTemplate = (image, outputDirectory, template, format) => {
+const generateImageForTemplateInternal = (image, outputDirectory, template, format) => {
     const outputFormat = format || getFileFormatFromFilename(template.name);
 
     return image
         .clone()
         .resize(template.width, template.height || template.width)
-        .toFormat(outputFormat)
-        .toFile(generateAssetDestination(outputDirectory, template, outputFormat))
-        .then(() => {
-            logMessage("Image resized to", template.width, "x", template.height || template.width, "and written to",
+        .toFormat(outputFormat);
+};
+
+const generateImageForTemplateToFile = (image, outputDirectory, template, format) => {
+    const outputFormat = format || getFileFormatFromFilename(template.name);
+    const assetDestination = generateAssetDestination(outputDirectory, template, outputFormat);
+
+    return generateImageForTemplateInternal(image, outputDirectory, template, format)
+        .toFile(assetDestination)
+        .then(info => {
+            logMessage("Image resized to", info.width, "x", info.height, "and written to",
                 outputDirectory);
         })
         .catch(errorMessage);
 };
 
-const generateAssetsGenerator = generator => (templates, input, outputDirectory, format) => {
+const generateImageForTemplateToBuffer = (image, outputDirectory, template, format) => {
+    return generateImageForTemplateInternal(image, outputDirectory, template, format)
+        .toBuffer({resolveWithObject: true})
+        .then(({data, info}) => {
+            logMessage("Image resized to", info.width, "x", info.height, "and returned as buffer");
+            return data;
+        })
+        .catch(errorMessage);
+};
+
+const generateImageForTemplate = (image, outputDirectory, template, format, type) => {
+    switch (type) {
+        case "buffer":
+            return generateImageForTemplateToBuffer(image, outputDirectory, template, format);
+
+        case "file":
+        default:
+            return generateImageForTemplateToFile(image, outputDirectory, template, format);
+    }
+};
+
+const generateAssetsGenerator = generator => (templates, input, outputDirectory, format, type = "file") => {
     const image = sharp(input);
 
     return new Promise((resolve, reject) => {
@@ -42,7 +70,7 @@ const generateAssetsGenerator = generator => (templates, input, outputDirectory,
             resolve();
         });
     })
-        .then(() => Promise.all(templates.map(template => generator(image, outputDirectory, template, format))));
+        .then(() => Promise.all(templates.map(template => generator(image, outputDirectory, template, format, type))));
 };
 
 module.exports = {

test/integration/src/lib/index.js

@@ -1,3 +1,4 @@
+const {Buffer} = require("buffer");
 const fs = require("fs");
 const path = require("path");
 const mkdirp = require("mkdirp");
@@ -19,7 +20,7 @@ describe("lib", function () {
     });
 
     describe("iconsGenerator", function () {
-        it("generates icons for templates", function () {
+        it("generates icons for templates (to file)", function () {
             const templates = [
                 { name: "woof.icon.png", width: 100, height: 100 },
                 { name: "meow.icon.png", width: 1000, height: 1000 },
@@ -35,6 +36,24 @@ describe("lib", function () {
                 });
         });
 
+        it("generates icons for templates (to buffer)", function () {
+            const templates = [
+                { name: "woof.icon.png", width: 100, height: 100 },
+                { name: "meow.icon.png", width: 1000, height: 1000 },
+                { name: "grr.splash.png", width: 1000 },
+            ];
+            const input = path.join(__dirname, "../../../resources/com.appbusinesspodcast.www.icon.png");
+
+            return iconsGenerator(templates, input, output, undefined, "buffer")
+                .then(buffers => {
+                    expect(buffers).to.have.length(templates.length);
+
+                    buffers.forEach(buffer => {
+                        expect(buffer).to.be.instanceOf(Buffer);
+                    });
+                });
+        });
+
         it("supports a different format", function () {
             const templates = [
                 { name: "woof.icon.png", width: 100, height: 100 },
@@ -72,7 +91,7 @@ describe("lib", function () {
     });
 
     describe("splashScreensGenerator", function () {
-        it("generates splash screens for templates", function () {
+        it("generates splash screens for templates (to file)", function () {
             const templates = [
                 { name: "woof.splash.png", width: 900, height: 1600 },
                 { name: "meow.splash.png", width: 1600, height: 1000 },
@@ -88,6 +107,24 @@ describe("lib", function () {
                 });
         });
 
+        it("generates splash screens for templates (to buffer)", function () {
+            const templates = [
+                { name: "woof.splash.png", width: 900, height: 1600 },
+                { name: "meow.splash.png", width: 1600, height: 1000 },
+                { name: "grr.splash.png", width: 1600 },
+            ];
+            const input = path.join(__dirname, "../../../resources/com.appbusinesspodcast.www.splash.png");
+
+            return splashScreensGenerator(templates, input, output, undefined, "buffer")
+                .then(buffers => {
+                    expect(buffers).to.have.length(templates.length);
+
+                    buffers.forEach(buffer => {
+                        expect(buffer).to.be.instanceOf(Buffer);
+                    });
+                });
+        });
+
         it("supports a different format", function () {
             const templates = [
                 { name: "woof.splash.png", width: 900, height: 1600 },