Basic functionality

main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+  "fmt"
+  "os"
+  "io/ioutil"
+  "net/http"
+  "net/url"
+  "encoding/json"
+  "sync"
+  "io"
+)
+
+const baseUrl = "http://www.websequencediagrams.com"
+
+type Response struct {
+  ImageUrl string `json:"img"`
+  Errors []string `json:"errors"`
+}
+
+func main()  {
+  var wg sync.WaitGroup
+
+  for _, filename := range(os.Args[1:]) {
+    sourceBytes, err := ioutil.ReadFile(filename)
+    if err != nil {
+      panic(err);
+    }
+    wg.Add(1)
+    fmt.Printf("%s --> %s.png\n", filename, filename)
+    go sequence(string(sourceBytes), fmt.Sprintf("%s.png", filename), &wg)
+  }
+
+  wg.Wait()
+}
+
+func sequence(source string, destination string, wg *sync.WaitGroup) (err error){
+  var jsonResponse = Response{}
+
+  defer wg.Done()
+
+  res, err := http.PostForm(fmt.Sprintf("%s/index.php", baseUrl), url.Values{"style": {"default"}, "message": {source}, "apiVersion": {"1"}, "format": {"png"}})
+  if err != nil {
+    return err;
+  }
+
+  err = json.NewDecoder(res.Body).Decode(&jsonResponse)
+  if err != nil {
+    return err;
+  }
+
+  res, err = http.Get(fmt.Sprintf("%s/%s", baseUrl, jsonResponse.ImageUrl))
+  if err != nil {
+    return err;
+  }
+
+  defer res.Body.Close()
+  file, err := os.Create(destination)
+  if err != nil {
+      return err
+  }
+
+  _, err = io.Copy(file, res.Body)
+  if err != nil {
+      return err
+  }
+  file.Close()
+
+  return nil
+}