[github] Share Project: fix github host url for Enterprise. IDEA-101424

Instead of always using https://github.com,
use the host defined in the settings.

plugins/github/src/org/jetbrains/plugins/github/GithubApiUtil.java

@@ -119,6 +119,16 @@ public class GithubApiUtil {
     return "https://" + getApiUrlWithoutProtocol(urlFromSettings);
   }
 
+  /**
+   * Returns the "host" part of Git URLs.
+   * E.g.: https://github.com
+   * Note: there is no trailing slash in the returned url.
+   */
+  @NotNull
+  public static String getGitHost() {
+    return "https://" + removeTrailingSlash(removeProtocolPrefix(GithubSettings.getInstance().getHost()));
+  }
+
   /*
    All API access is over HTTPS, and accessed from the api.github.com domain
    (or through yourdomain.com/api/v3/ for enterprise).

plugins/github/src/org/jetbrains/plugins/github/GithubShareAction.java

@@ -218,7 +218,7 @@ public class GithubShareAction extends DumbAwareAction {
     final GitSimpleHandler addRemoteHandler = new GitSimpleHandler(project, root, GitCommand.REMOTE);
     addRemoteHandler.setNoSSH(true);
     addRemoteHandler.setSilent(true);
-    final String remoteUrl = "https://github.com/" + login + "/" + name + ".git";
+    final String remoteUrl = GithubApiUtil.getGitHost() + "/" + login + "/" + name + ".git";
     addRemoteHandler.addParameters("add", "origin", remoteUrl);
     try {
       addRemoteHandler.run();