Improve issue close re: overfetching, handling PRs

- `issue close` no longer fetches all issue fields and thus avoids the
  problem when loading failed due to token not having access to projects

- `issue close` now accepts either issue or pull number as argument.

api/client.go

@@ -124,7 +124,18 @@ type graphQLResponse struct {
 type GraphQLError struct {
 	Type    string
 	Message string
-	// Path []interface // mixed strings and numbers
+	Path    []interface{} // mixed strings and numbers
+}
+
+func (ge GraphQLError) PathString() string {
+	var res strings.Builder
+	for i, v := range ge.Path {
+		if i > 0 {
+			res.WriteRune('.')
+		}
+		fmt.Fprintf(&res, "%v", v)
+	}
+	return res.String()
 }
 
 // GraphQLErrorResponse contains errors returned in a GraphQL response
@@ -140,6 +151,14 @@ func (gr GraphQLErrorResponse) Error() string {
 	return fmt.Sprintf("GraphQL error: %s", strings.Join(errorMessages, "\n"))
 }
 
+// Match checks if this error is only about a specific type on a specific path.
+func (gr GraphQLErrorResponse) Match(expectType, expectPath string) bool {
+	if len(gr.Errors) != 1 {
+		return false
+	}
+	return gr.Errors[0].Type == expectType && gr.Errors[0].PathString() == expectPath
+}
+
 // HTTPError is an error returned by a failed API call
 type HTTPError struct {
 	StatusCode int
@@ -221,7 +240,8 @@ func EndpointNeedsScopes(resp *http.Response, s string) *http.Response {
 	return resp
 }
 
-// GraphQL performs a GraphQL request and parses the response
+// GraphQL performs a GraphQL request and parses the response. If there are errors in the response,
+// *GraphQLErrorResponse will be returned, but the data will also be parsed into the receiver.
 func (c Client) GraphQL(hostname string, query string, variables map[string]interface{}, data interface{}) error {
 	reqBody, err := json.Marshal(map[string]interface{}{"query": query, "variables": variables})
 	if err != nil {

api/client_test.go

@@ -50,8 +50,16 @@ func TestGraphQLError(t *testing.T) {
 		httpmock.GraphQL(""),
 		httpmock.StringResponse(`
 			{ "errors": [
-				{"message":"OH NO"},
-				{"message":"this is fine"}
+				{
+					"type": "NOT_FOUND",
+					"message": "OH NO",
+					"path": ["repository", "issue"]
+				},
+				{
+					"type": "ACTUALLY_ITS_FINE",
+					"message": "this is fine",
+					"path": ["repository", "issues", 0, "comments"]
+				}
 			  ]
 			}
 		`),

api/queries_issue.go

@@ -22,6 +22,7 @@ type IssuesAndTotalCount struct {
 }
 
 type Issue struct {
+	Typename       string `json:"__typename"`
 	ID             string
 	Number         int
 	Title          string
@@ -41,6 +42,10 @@ type Issue struct {
 	ReactionGroups ReactionGroups
 }
 
+func (i Issue) IsPullRequest() bool {
+	return i.Typename == "PullRequest"
+}
+
 type Assignees struct {
 	Nodes      []GitHubUser
 	TotalCount int
@@ -337,31 +342,6 @@ func IssueByNumber(client *Client, repo ghrepo.Interface, number int) (*Issue, e
 	return &resp.Repository.Issue, nil
 }
 
-func IssueClose(client *Client, repo ghrepo.Interface, issue Issue) error {
-	var mutation struct {
-		CloseIssue struct {
-			Issue struct {
-				ID githubv4.ID
-			}
-		} `graphql:"closeIssue(input: $input)"`
-	}
-
-	variables := map[string]interface{}{
-		"input": githubv4.CloseIssueInput{
-			IssueID: issue.ID,
-		},
-	}
-
-	gql := graphQLClient(client.http, repo.RepoHost())
-	err := gql.MutateNamed(context.Background(), "IssueClose", &mutation, variables)
-
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
 func IssueReopen(client *Client, repo ghrepo.Interface, issue Issue) error {
 	var mutation struct {
 		ReopenIssue struct {

api/queries_pr.go

@@ -660,7 +660,7 @@ func isBlank(v interface{}) bool {
 	}
 }
 
-func PullRequestClose(client *Client, repo ghrepo.Interface, pr *PullRequest) error {
+func PullRequestClose(httpClient *http.Client, repo ghrepo.Interface, prID string) error {
 	var mutation struct {
 		ClosePullRequest struct {
 			PullRequest struct {
@@ -671,14 +671,12 @@ func PullRequestClose(client *Client, repo ghrepo.Interface, pr *PullRequest) er
 
 	variables := map[string]interface{}{
 		"input": githubv4.ClosePullRequestInput{
-			PullRequestID: pr.ID,
+			PullRequestID: prID,
 		},
 	}
 
-	gql := graphQLClient(client.http, repo.RepoHost())
-	err := gql.MutateNamed(context.Background(), "PullRequestClose", &mutation, variables)
-
-	return err
+	gql := graphQLClient(httpClient, repo.RepoHost())
+	return gql.MutateNamed(context.Background(), "PullRequestClose", &mutation, variables)
 }
 
 func PullRequestReopen(client *Client, repo ghrepo.Interface, pr *PullRequest) error {