[MER-2419] feat: av pr queue support (#188)

* [MER-2419] feat: `av pr queue` support

* Fixes

---------

Co-authored-by: Travis DePrato <[email protected]>

cmd/av/pr.go

@@ -12,6 +12,7 @@ var prCmd = &cobra.Command{
 func init() {
 	prCmd.AddCommand(
 		prCreateCmd,
+		prQueueCmd,
 		prStatusCmd,
 	)
 }

cmd/av/pr_queue.go

@@ -0,0 +1,103 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/aviator-co/av/internal/utils/colors"
+	"github.com/sirupsen/logrus"
+
+	"github.com/aviator-co/av/internal/actions"
+	"github.com/aviator-co/av/internal/avgql"
+	"github.com/shurcooL/graphql"
+	"github.com/spf13/cobra"
+)
+
+var prQueueFlags struct {
+	SkipLine bool
+	Targets  string
+}
+
+var prQueueCmd = &cobra.Command{
+	Use:          "queue",
+	Short:        "queue a pull request for the current branch",
+	SilenceUsage: true,
+	Args:         cobra.NoArgs,
+	// error or reterr from emperror.dev/errors here?
+	RunE: func(cmd *cobra.Command, args []string) error {
+		repo, err := getRepo()
+		if err != nil {
+			return err
+		}
+
+		db, err := getDB(repo)
+		if err != nil {
+			return err
+		}
+
+		tx := db.ReadTx()
+		currentBranchName, err := repo.CurrentBranchName()
+		if err != nil {
+			return err
+		}
+
+		branch, _ := tx.Branch(currentBranchName)
+		if branch.PullRequest == nil {
+			return errors.New(
+				"this branch has no associated pull request (run `av pr create` to create one)",
+			)
+		}
+
+		prNumber := branch.PullRequest.Number
+		repository, exists := tx.Repository()
+		if !exists {
+			return actions.ErrRepoNotInitialized
+		}
+
+		var variables = map[string]interface{}{
+			"repoOwner": graphql.String(repository.Owner),
+			"repoName":  graphql.String(repository.Name),
+			"prNumber":  graphql.Int(prNumber),
+		}
+
+		// I have a feeling this would be better written inside of av/internals
+		client := avgql.NewClient()
+
+		var mutation struct {
+			QueuePullRequest struct {
+				QueuePullRequestPayload struct {
+					PullRequest struct {
+						// We don't currently use anything here, but we need to select
+						// at least one field to make the GraphQL query valid.
+						Status graphql.String
+					}
+				} `graphql:"... on QueuePullRequestPayload"`
+			} `graphql:"queuePullRequest(input: {repoOwner: $repoOwner, repoName:$repoName, number:$prNumber})"`
+		}
+
+		err = client.Mutate(context.Background(), &mutation, variables)
+		if err != nil {
+			logrus.WithError(err).Debug("failed to queue pull request")
+			return fmt.Errorf("failed to queue pull request: %s", err)
+		}
+		_, _ = fmt.Fprint(
+			os.Stderr,
+			"Queued pull request ", colors.UserInput(branch.PullRequest.Permalink), ".\n",
+		)
+
+		return nil
+	},
+}
+
+func init() {
+	prQueueCmd.Flags().BoolVar(
+		&prQueueFlags.SkipLine, "skip-line", false,
+		"skip in front of the existing pull requests, merge this pull request right now",
+	)
+	prQueueCmd.Flags().StringVarP(
+		&prQueueFlags.Targets, "targets", "t", "",
+		"additional targets affected by this pull request",
+	)
+}