Support for unlink

pkg/cmd/project/link/link.go

@@ -138,6 +138,6 @@ func printResults(config linkConfig, repo queries.Repository) error {
 		return nil
 	}
 
-	_, err := fmt.Fprintf(config.io.Out, "%s\n", repo.Project.URL)
+	_, err := fmt.Fprintf(config.io.Out, "%s\n", repo.URL)
 	return err
 }

pkg/cmd/project/project.go

@@ -19,6 +19,7 @@ import (
 	cmdLink "github.com/cli/cli/v2/pkg/cmd/project/link"
 	cmdList "github.com/cli/cli/v2/pkg/cmd/project/list"
 	cmdTemplate "github.com/cli/cli/v2/pkg/cmd/project/mark-template"
+	cmdUnlink "github.com/cli/cli/v2/pkg/cmd/project/unlink"
 	cmdView "github.com/cli/cli/v2/pkg/cmd/project/view"
 	"github.com/cli/cli/v2/pkg/cmdutil"
 	"github.com/spf13/cobra"
@@ -47,6 +48,7 @@ func NewCmdProject(f *cmdutil.Factory) *cobra.Command {
 	cmd.AddCommand(cmdLink.NewCmdLink(f, nil))
 	cmd.AddCommand(cmdView.NewCmdView(f, nil))
 	cmd.AddCommand(cmdTemplate.NewCmdMarkTemplate(f, nil))
+	cmd.AddCommand(cmdUnlink.NewCmdUnlink(f, nil))
 
 	// items
 	cmd.AddCommand(cmdItemList.NewCmdList(f, nil))

pkg/cmd/project/shared/queries/queries.go

@@ -104,15 +104,9 @@ type PageInfo struct {
 
 // Repository is a Repository GraphQL object https://docs.github.com/en/graphql/reference/objects#repository
 type Repository struct {
-	Name    string
-	ID      string
-	URL     string
-	Project struct {
-		Title  string
-		ID     string
-		Number int32
-		URL    string
-	} `graphql:"projectV2(number: $projectNumber)"`
+	Name string
+	ID   string
+	URL  string
 }
 
 // Project is a ProjectV2 GraphQL object https://docs.github.com/en/graphql/reference/objects#projectv2.

pkg/cmd/project/unlink/unlink.go

@@ -0,0 +1,143 @@
+package unlink
+
+import (
+	"fmt"
+	"github.com/MakeNowJust/heredoc"
+	"github.com/cli/cli/v2/api"
+	"github.com/cli/cli/v2/internal/ghrepo"
+	"github.com/cli/cli/v2/pkg/cmd/project/shared/client"
+	"github.com/cli/cli/v2/pkg/cmd/project/shared/queries"
+	"github.com/cli/cli/v2/pkg/cmdutil"
+	"github.com/cli/cli/v2/pkg/iostreams"
+	"github.com/shurcooL/githubv4"
+	"github.com/spf13/cobra"
+	"net/http"
+	"strconv"
+)
+
+type unlinkOpts struct {
+	number    int32
+	owner     string
+	repo      string
+	projectID string
+	repoID    string
+	format    string
+	exporter  cmdutil.Exporter
+}
+
+type unlinkConfig struct {
+	httpClient func() (*http.Client, error)
+	client     *queries.Client
+	opts       unlinkOpts
+	io         *iostreams.IOStreams
+}
+
+type unlinkProjectFromRepoMutation struct {
+	UnlinkProjectV2FromRepository struct {
+		Repository queries.Repository `graphql:"repository"`
+	} `graphql:"unlinkProjectV2FromRepository(input:$input)"`
+}
+
+func NewCmdUnlink(f *cmdutil.Factory, runF func(config unlinkConfig) error) *cobra.Command {
+	opts := unlinkOpts{}
+	linkCmd := &cobra.Command{
+		Short: "Unlink a project from a repository",
+		Use:   "unlink [<number>] [flag]",
+		Example: heredoc.Doc(`
+			# unlink monalisa's project "1" from her repository "my_repo"
+			gh project unlink 1 --repo my_repo
+		`),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			client, err := client.New(f)
+			if err != nil {
+				return err
+			}
+
+			if len(args) == 1 {
+				num, err := strconv.ParseInt(args[0], 10, 32)
+				if err != nil {
+					return cmdutil.FlagErrorf("invalid number: %v", args[0])
+				}
+				opts.number = int32(num)
+			}
+
+			config := unlinkConfig{
+				httpClient: f.HttpClient,
+				client:     client,
+				opts:       opts,
+				io:         f.IOStreams,
+			}
+
+			if config.opts.repo == "" {
+				return fmt.Errorf("required flag: repo")
+			}
+
+			// allow testing of the command without actually running it
+			if runF != nil {
+				return runF(config)
+			}
+			return runUnlink(config)
+		},
+	}
+
+	linkCmd.Flags().StringVar(&opts.owner, "owner", "", "Login of the owner. Use \"@me\" for the current user.")
+	linkCmd.Flags().StringVarP(&opts.repo, "repo", "R", "", "The repository to be unlinked from this project")
+	cmdutil.AddFormatFlags(linkCmd, &opts.exporter)
+
+	return linkCmd
+}
+
+func runUnlink(config unlinkConfig) error {
+	canPrompt := config.io.CanPrompt()
+	owner, err := config.client.NewOwner(canPrompt, config.opts.owner)
+	if err != nil {
+		return err
+	}
+
+	project, err := config.client.NewProject(canPrompt, owner, config.opts.number, false)
+	if err != nil {
+		return err
+	}
+	config.opts.projectID = project.ID
+
+	httpClient, err := config.httpClient()
+	if err != nil {
+		return err
+	}
+	c := api.NewClientFromHTTP(httpClient)
+
+	repo, err := api.GitHubRepo(c, ghrepo.New(owner.Login, config.opts.repo))
+	if err != nil {
+		return err
+	}
+	config.opts.repoID = repo.ID
+
+	query, variable := unlinkRepoArgs(config)
+	err = config.client.Mutate("UnlinkProjectV2FromRepository", query, variable)
+	if err != nil {
+		return err
+	}
+
+	if config.opts.exporter != nil {
+		return config.opts.exporter.Write(config.io, query.UnlinkProjectV2FromRepository.Repository)
+	}
+	return printResults(config, query.UnlinkProjectV2FromRepository.Repository)
+}
+
+func unlinkRepoArgs(config unlinkConfig) (*unlinkProjectFromRepoMutation, map[string]interface{}) {
+	return &unlinkProjectFromRepoMutation{}, map[string]interface{}{
+		"input": githubv4.UnlinkProjectV2FromRepositoryInput{
+			ProjectID:    githubv4.ID(config.opts.projectID),
+			RepositoryID: githubv4.ID(config.opts.repoID),
+		},
+	}
+}
+
+func printResults(config unlinkConfig, repo queries.Repository) error {
+	if !config.io.IsStdoutTTY() {
+		return nil
+	}
+
+	_, err := fmt.Fprintf(config.io.Out, "%s\n", repo.URL)
+	return err
+}