Add support to retrieve information about the currently authenticated…

… user

Copy https://github.com/terraform-providers/terraform-provider-github/pull/261 as the original repository behind this PR has been deleted

github/data_source_github_user.go

@@ -111,11 +111,11 @@ func dataSourceGithubUserRead(d *schema.ResourceData, meta interface{}) error {
 		return err
 	}
 
-	gpg, _, err := client.Users.ListGPGKeys(ctx, username, nil)
+	gpg, _, err := client.Users.ListGPGKeys(ctx, user.GetLogin(), nil)
 	if err != nil {
 		return err
 	}
-	ssh, _, err := client.Users.ListKeys(ctx, username, nil)
+	ssh, _, err := client.Users.ListKeys(ctx, user.GetLogin(), nil)
 	if err != nil {
 		return err
 	}

website/docs/d/user.html.markdown

@@ -1,6 +1,7 @@
 ---
 layout: "github"
 page_title: "GitHub: github_user"
+sidebar_current: "docs-github-datasource-user"
 description: |-
   Get information on a GitHub user.
 ---
@@ -12,14 +13,25 @@ Use this data source to retrieve information about a GitHub user.
 ## Example Usage
 
 ```hcl
+# Retrieve information about a GitHub user.
 data "github_user" "example" {
   username = "example"
 }
+
+# Retrieve information about the currently authenticated user.
+data "github_user" "current" {
+  username = ""
+}
+
+output "current_github_login" {
+  value = "${data.github_user.current.login}"
+}
+
 ```
 
 ## Argument Reference
 
- * `username` - (Required) The username.
+ * `username` - (Required) The username. Use an empty string `""` to retrieve information about the currently authenticated user.
 
 ## Attributes Reference
 
@@ -41,4 +53,3 @@ data "github_user" "example" {
  * `following` - the number of following users.
  * `created_at` - the creation date.
  * `updated_at` - the update date.
-