feat(snippet): Add command for creating snippets

This adds a simple snippet creation command. This currently just allows
for creating snippets from STDIN like so:

`echo "this is a script" | glab snippet create --title "snippet" --filename "example.py"`

There are few things that are missing from this, like ability to add
more then one file to the snippet, but that is not supported by the "github.com/xanzy/go-gitlab" yet.

Issue is opened for that xanzy/go-gitlab#1372

Issue profclems#872

commands/root.go

@@ -17,6 +17,7 @@ import (
 	mrCmd "github.com/profclems/glab/commands/mr"
 	projectCmd "github.com/profclems/glab/commands/project"
 	releaseCmd "github.com/profclems/glab/commands/release"
+	snippetCmd "github.com/profclems/glab/commands/snippet"
 	sshCmd "github.com/profclems/glab/commands/ssh-key"
 	updateCmd "github.com/profclems/glab/commands/update"
 	userCmd "github.com/profclems/glab/commands/user"
@@ -113,6 +114,7 @@ func NewCmdRoot(f *cmdutils.Factory, version, buildDate string) *cobra.Command {
 	rootCmd.AddCommand(userCmd.NewCmdUser(f))
 	rootCmd.AddCommand(variableCmd.NewVariableCmd(f))
 	rootCmd.AddCommand(apiCmd.NewCmdApi(f, nil))
+	rootCmd.AddCommand(snippetCmd.NewCmdSnippet(f))
 
 	rootCmd.Flags().BoolP("version", "v", false, "show glab version information")
 	return rootCmd

commands/snippet/create/create.go

@@ -0,0 +1,120 @@
+package create
+
+import (
+	"errors"
+	"fmt"
+	"io"
+
+	"github.com/MakeNowJust/heredoc"
+	"github.com/profclems/glab/api"
+	"github.com/profclems/glab/commands/cmdutils"
+	"github.com/profclems/glab/internal/glrepo"
+	"github.com/profclems/glab/pkg/iostreams"
+	"github.com/spf13/cobra"
+	"github.com/xanzy/go-gitlab"
+)
+
+type CreateOpts struct {
+	Title       string
+	Description string
+	Filename    string
+	Visibility  string
+
+	ForUser bool
+
+	IO       *iostreams.IOStreams
+	Lab      func() (*gitlab.Client, error)
+	BaseRepo func() (glrepo.Interface, error)
+}
+
+func NewCmdCreate(f *cmdutils.Factory) *cobra.Command {
+	opts := &CreateOpts{}
+	var snippetCreateCmd = &cobra.Command{
+		Use:     "create",
+		Short:   `Create new snippet`,
+		Long:    ``,
+		Aliases: []string{"new"},
+		Example: heredoc.Doc(`
+			$ glab snippet new --title "Title of the snippet" --filename "main.go"
+			$ glab snippet create --title "Title of the snippet" --filename "main.go"
+			$ glab snippet create -t Title -f "main.go" -d Description
+		`),
+		Args: cobra.ExactArgs(0),
+		PreRunE: func(cmd *cobra.Command, args []string) error {
+			opts.IO = f.IO
+			opts.BaseRepo = f.BaseRepo
+			opts.Lab = f.HttpClient
+			if opts.Title == "" {
+				return &cmdutils.FlagError{
+					Err: errors.New("--title required for snipets"),
+				}
+			}
+			if opts.Filename == "" {
+				return &cmdutils.FlagError{
+					Err: errors.New("--filename required for snipets"),
+				}
+			}
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			client, err := opts.Lab()
+			if err != nil {
+				return err
+			}
+			repo, err := opts.BaseRepo()
+			if err != nil {
+				return err
+			}
+
+			return runCreate(client, repo, opts)
+		},
+	}
+
+	snippetCreateCmd.Flags().StringVarP(&opts.Title, "title", "t", "", "Title of the snippet")
+	snippetCreateCmd.Flags().StringVarP(&opts.Filename, "filename", "f", "", "Filename of the snippet")
+	snippetCreateCmd.Flags().StringVarP(&opts.Description, "description", "d", "", "Description of the snippet")
+	snippetCreateCmd.Flags().StringVarP(&opts.Visibility, "visibility", "v", "private", "Limit by visibility {public, internal, or private}")
+
+	return snippetCreateCmd
+}
+
+func runCreate(client *gitlab.Client, repo glrepo.Interface, opts *CreateOpts) error {
+	content, err := readSnippetsContent(opts)
+	if err != nil {
+		return err
+	}
+	fmt.Fprintln(opts.IO.StdErr, "- Creating snippet in", repo.FullName())
+	snippet, err := api.CreateProjectSnippet(client, repo.FullName(), &gitlab.CreateProjectSnippetOptions{
+		Title:       &opts.Title,
+		Description: &opts.Description,
+		Content:     gitlab.String(string(content)),
+		FileName:    &opts.Filename,
+		Visibility:  gitlab.Visibility(gitlab.VisibilityValue(opts.Visibility)),
+	})
+	if err != nil {
+		return fmt.Errorf("failed to create snippet. %w", err)
+	}
+	snippetID := opts.IO.Color().Green(fmt.Sprintf("$%d", snippet.ID))
+	if opts.IO.IsaTTY {
+		fmt.Fprintf(opts.IO.StdOut, "%s %s (%s)\n %s\n", snippetID, snippet.Title, snippet.FileName, snippet.WebURL)
+	} else {
+		fmt.Fprintln(opts.IO.StdOut, snippet.WebURL)
+	}
+
+	return nil
+}
+
+// FIXME: Add a flag that would allow reading the snippets from a file instead of just STDIN.
+// 	      Adding more then one file can't be done right now because the GitLab API library
+//		  Doesn't support it yet.
+//
+// 		  See for the API reference: https://docs.gitlab.com/ee/api/snippets.html#create-new-snippet
+// 		  See for the library docs : https://pkg.go.dev/github.com/xanzy/go-gitlab#CreateSnippetOptions
+//		  See for GitHub issue     : https://github.com/xanzy/go-gitlab/issues/1372
+func readSnippetsContent(opts *CreateOpts) (string, error) {
+	content, err := io.ReadAll(opts.IO.In)
+	if err != nil {
+		return "", fmt.Errorf("Failed to read snippet from STDIN. %w", err)
+	}
+	return string(content), nil
+}

commands/snippet/snippet.go

@@ -0,0 +1,30 @@
+package snippet
+
+import (
+	"github.com/MakeNowJust/heredoc"
+	"github.com/profclems/glab/commands/cmdutils"
+	"github.com/profclems/glab/commands/snippet/create"
+	"github.com/spf13/cobra"
+)
+
+func NewCmdSnippet(f *cmdutils.Factory) *cobra.Command {
+	var snippetCmd = &cobra.Command{
+		Use:   "snippet <command> [flags]",
+		Short: `Create, view and manage snippets`,
+		Long:  ``,
+		Example: heredoc.Doc(`
+			$ glab snippet create --title "Title of the snippet" --filename "main.go"
+		`),
+		Annotations: map[string]string{
+			"help:arguments": heredoc.Doc(`
+			A snippet can be supplied as argument in the following format:
+			- by number, e.g. "123"
+			`),
+		},
+	}
+
+	cmdutils.EnableRepoOverride(snippetCmd, f)
+
+	snippetCmd.AddCommand(create.NewCmdCreate(f))
+	return snippetCmd
+}

commands/snippet/snippet_test.go

@@ -0,0 +1,41 @@
+package snippet
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"testing"
+
+	"github.com/alecthomas/assert"
+	"github.com/profclems/glab/commands/cmdtest"
+	"github.com/profclems/glab/commands/cmdutils"
+)
+
+func TestMain(m *testing.M) {
+	cmdtest.InitTest(m, "mr_cmd_test")
+	cmdtest.InitTest(m, "mr_cmd_autofill")
+}
+
+func TestCmdSnippet_noARgs(t *testing.T) {
+	old := os.Stdout // keep backup of the real stdout
+	r, w, _ := os.Pipe()
+	os.Stdout = w
+
+	assert.Nil(t, NewCmdSnippet(&cmdutils.Factory{}).Execute())
+
+	outC := make(chan string)
+	// copy the output in a separate goroutine so printing can't block indefinitely
+	go func() {
+		var buf bytes.Buffer
+		_, _ = io.Copy(&buf, r)
+		outC <- buf.String()
+	}()
+
+	// back to normal state
+	w.Close()
+	os.Stdout = old // restoring the real stdout
+	out := <-outC
+
+	assert.Contains(t, out, "Use \"snippet [command] --help\" for more information about a command.\n")
+
+}