all: reorganize files

Makefile

@@ -4,11 +4,11 @@
 
 all:
 	GOOS=linux go build -mod=vendor ./cmd/code2img
-	docker build -t code2img .
+	docker build -t code2img -f docker/Dockerfile .
 up:
-	docker-compose -f docker-compose.yml up -d
+	docker-compose -f docker/docker-compose.yml up -d
 down:
-	docker-compose -f docker-compose.yml down
+	docker-compose -f docker/docker-compose.yml down
 clean:
 	rm code2img
 	docker rmi -f $(shell docker images -f "dangling=true" -q) 2> /dev/null; true

README.md

@@ -11,7 +11,7 @@ import "golang.design/x/code2img"
 Just one API `code2img.Render`, to use it:
 
 ```go
-b, err := code2img.Render(`import "golang.design/x/code2img"`)
+b, err := code2img.Render(context.TODO(), `import "golang.design/x/code2img"`)
 if err != nil {
     panic(err)
 }
@@ -32,7 +32,7 @@ Basic usage notes:
 
 Demo:
 
-![](./demo.gif)
+![](./testdata/demo.gif)
 
 ### Server API
 
@@ -64,4 +64,4 @@ make up
 
 ## License
 
-© 2020 The golang.design Initiative Authors.
+© 2020-2021 The golang.design Initiative Authors.

code2img.go

@@ -11,7 +11,6 @@ import (
 	"fmt"
 	"math"
 	"net/url"
-	"time"
 
 	"github.com/chromedp/cdproto/cdp"
 	"github.com/chromedp/cdproto/dom"
@@ -22,7 +21,7 @@ import (
 
 // Render renders the given code string and returns a binary buffer
 // that contains a carbon-now based image.
-func Render(code string) ([]byte, error) {
+func Render(ctx context.Context, code string) ([]byte, error) {
 	// https://carbon.now.sh/?
 	// bg=rgba(74%2C144%2C226%2C1)&
 	// t=material&
@@ -73,9 +72,7 @@ func Render(code string) ([]byte, error) {
 	codeparam := url.Values{}
 	codeparam.Set("code", url.PathEscape(code))
 
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
-	defer cancel()
-	ctx, cancel = chromedp.NewContext(ctx)
+	ctx, cancel := chromedp.NewContext(ctx)
 	defer cancel()
 
 	url := "https://carbon.now.sh/?" + values.Encode() + "&" + codeparam.Encode()

code2img_test.go

@@ -8,16 +8,21 @@ package code2img_test
 
 import (
 	"bytes"
+	"context"
 	"image/png"
 	"math"
 	"os"
 	"testing"
+	"time"
 
 	"golang.design/x/code2img"
 )
 
 func TestRender(t *testing.T) {
-	got, err := code2img.Render(`import "golang.design/x/code2img`)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	defer cancel()
+
+	got, err := code2img.Render(ctx, `import "golang.design/x/code2img`)
 	if err != nil {
 		t.Fatalf("render failed: %v", err)
 	}
@@ -27,7 +32,7 @@ func TestRender(t *testing.T) {
 		t.Fatalf("cannot read rendered image: %v", err)
 	}
 
-	want, err := os.ReadFile("testdata.png")
+	want, err := os.ReadFile("testdata/want.png")
 	if err != nil {
 		t.Fatalf("cannot read gold test file: %v", err)
 	}
@@ -40,7 +45,7 @@ func TestRender(t *testing.T) {
 	if math.Abs(float64(imgGot.Bounds().Dx()-imgWant.Bounds().Dx())) > 5 ||
 		math.Abs(float64(imgGot.Bounds().Dy()-imgWant.Bounds().Dy())) > 5 {
 
-		err := os.WriteFile("got.png", got, os.ModePerm)
+		err := os.WriteFile("testdata/got.png", got, os.ModePerm)
 		if err != nil {
 			t.Errorf("failed to write image: %v", err)
 		}

docker-compose.yml → docker/docker-compose.yml

@@ -9,7 +9,7 @@ services:
     container_name: code2img
     restart: always
     volumes:
-      - ./data:/app/data
+      - ../data:/app/data
     image: code2img
     cap_add:
       - SYS_PTRACE # for debugging