Update README; print usage when too few arguments are given

mrngm · Oct 27, 2018 · 076b82b · 076b82b
1 parent 0d6e77e
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diff --git a/README.md b/README.md
@@ -11,12 +11,19 @@ software for the time being.
 
 ![I have no idea what I'm doing](https://user-images.githubusercontent.com/519171/45828811-7f984700-bcc7-11e8-8ff5-114ff55d9014.gif)
 
-
 ## Usage
 
+### Preliminaries
+
+```shell
+go get github.com/octokit/go-octokit/octokit
+go build
+```
+
+### Running `go-make-labels`
+
 Populate label configuration in `example.json` and run
 
 ```shell
-export OCTOKIT_ACCESS_TOKEN=1234567890
-go run main.go "kylemacey/go-make-labels"
+OCTOKIT_ACCESS_TOKEN=1234567890 ./go-make-labels "kylemacey/go-make-labels"
 ```
diff --git a/main.go b/main.go
@@ -14,6 +14,12 @@ import (
 )
 
 func main() {
+	if len(os.Args) != 2 {
+		fmt.Printf("Usage: %s <user/repository>\n\n", os.Args[0])
+		fmt.Println("Don't forget to set the environment variable OCTOKIT_ACCESS_TOKEN.")
+		return
+	}
+
 	client := octokit.NewClient(getAuthMethod())
 
 	labels, result := client.Labels().All(nil, getRepoParams())