Add close pull request code

api/queries_pr.go

@@ -1,11 +1,13 @@
 package api
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"time"
 
 	"github.com/cli/cli/internal/ghrepo"
+	"github.com/shurcooL/githubv4"
 )
 
 type PullRequestsPayload struct {
@@ -20,9 +22,11 @@ type PullRequestAndTotalCount struct {
 }
 
 type PullRequest struct {
+	ID          string
 	Number      int
 	Title       string
 	State       string
+	Closed      bool
 	URL         string
 	BaseRefName string
 	HeadRefName string
@@ -755,6 +759,25 @@ loop:
 	return &res, nil
 }
 
+func PullRequestClose(client *Client, repo ghrepo.Interface, pr PullRequest) error {
+	var mutation struct {
+		ClosePullRequest struct {
+			PullRequest struct {
+				ID githubv4.ID
+			}
+		} `graphql:"closePullRequest(input: $input)"`
+	}
+
+	input := githubv4.ClosePullRequestInput{
+		PullRequestID: pr.ID,
+	}
+
+	v4 := githubv4.NewClient(client.http)
+	err := v4.Mutate(context.Background(), &mutation, input, nil)
+
+	return err
+}
+
 func min(a, b int) int {
 	if a < b {
 		return a

command/pr.go

@@ -21,16 +21,17 @@ func init() {
 	RootCmd.AddCommand(prCmd)
 	prCmd.AddCommand(prCheckoutCmd)
 	prCmd.AddCommand(prCreateCmd)
-	prCmd.AddCommand(prListCmd)
 	prCmd.AddCommand(prStatusCmd)
-	prCmd.AddCommand(prViewCmd)
+	prCmd.AddCommand(prCloseCmd)
 
+	prCmd.AddCommand(prListCmd)
 	prListCmd.Flags().IntP("limit", "L", 30, "Maximum number of items to fetch")
 	prListCmd.Flags().StringP("state", "s", "open", "Filter by state: {open|closed|merged|all}")
 	prListCmd.Flags().StringP("base", "B", "", "Filter by base branch")
 	prListCmd.Flags().StringSliceP("label", "l", nil, "Filter by label")
 	prListCmd.Flags().StringP("assignee", "a", "", "Filter by assignee")
 
+	prCmd.AddCommand(prViewCmd)
 	prViewCmd.Flags().BoolP("web", "w", false, "Open a pull request in the browser")
 }
 
@@ -65,6 +66,11 @@ is displayed.
 With '--web', open the pull request in a web browser instead.`,
 	RunE: prView,
 }
+var prCloseCmd = &cobra.Command{
+	Use:   "close [{<number> | <url>}]",
+	Short: "Close a pull request",
+	RunE:  prClose,
+}
 
 func prStatus(cmd *cobra.Command, args []string) error {
 	ctx := contextForCommand(cmd)
@@ -328,6 +334,38 @@ func prView(cmd *cobra.Command, args []string) error {
 	}
 }
 
+func prClose(cmd *cobra.Command, args []string) error {
+	ctx := contextForCommand(cmd)
+	apiClient, err := apiClientForContext(ctx)
+	if err != nil {
+		return err
+	}
+
+	baseRepo, err := determineBaseRepo(cmd, ctx)
+	if err != nil {
+		return err
+	}
+
+	pr, err := prFromArg(apiClient, baseRepo, args[0])
+	if err != nil {
+		return err
+	}
+
+	if pr.Closed {
+		fmt.Fprintf(colorableErr(cmd), "%s Pull request #%d is already closed\n", utils.Yellow("!"), pr.Number)
+		return nil
+	}
+
+	err = api.PullRequestClose(apiClient, baseRepo, *pr)
+	if err != nil {
+		return fmt.Errorf("API call failed:%w", err)
+	}
+
+	fmt.Fprintf(colorableErr(cmd), "%s Closed pull request #%d\n", utils.Red("✔"), pr.Number)
+
+	return nil
+}
+
 func printPrPreview(out io.Writer, pr *api.PullRequest) error {
 	// Header (Title and State)
 	fmt.Fprintln(out, utils.Bold(pr.Title))