cmd: support non-interactive shells

internal/cmd/auth/login.go

@@ -32,6 +32,9 @@ func LoginCmd(cfg *config.Config) *cobra.Command {
 		Args:  cobra.ExactArgs(0),
 		Short: "Authenticate with PlanetScale",
 		RunE: func(cmd *cobra.Command, args []string) error {
+			if !cmdutil.IsTTY {
+				return errors.New("The 'login' command requires an interactive shell")
+			}
 			authenticator, err := auth.New(cleanhttp.DefaultClient(), clientID, clientSecret, auth.SetBaseURL(authURL))
 			if err != nil {
 				return err

internal/cmd/auth/logout.go

@@ -31,8 +31,11 @@ func LogoutCmd(cfg *config.Config) *cobra.Command {
 				fmt.Println("Already logged out. Exiting...")
 				return nil
 			}
-			fmt.Println("Press Enter to log out of the PlanetScale API.")
-			_ = waitForEnter(cmd.InOrStdin())
+
+			if cmdutil.IsTTY {
+				fmt.Println("Press Enter to log out of the PlanetScale API.")
+				_ = waitForEnter(cmd.InOrStdin())
+			}
 
 			authenticator, err := auth.New(cleanhttp.DefaultClient(), clientID, clientSecret, auth.SetBaseURL(apiURL))
 			if err != nil {

internal/cmd/branch/delete.go

@@ -39,14 +39,17 @@ func DeleteCmd(cfg *config.Config) *cobra.Command {
 
 			if !force {
 				confirmationName := fmt.Sprintf("%s/%s", source, branch)
-				userInput := ""
+				if !cmdutil.IsTTY {
+					return fmt.Errorf("Cannot confirm deletion of branch %q (run with -force to override)", confirmationName)
+				}
 
 				confirmationMessage := fmt.Sprintf("%s %s %s", cmdutil.Bold("Please type"), cmdutil.BoldBlue(confirmationName), cmdutil.Bold("to confirm:"))
 
 				prompt := &survey.Input{
 					Message: confirmationMessage,
 				}
 
+				var userInput string
 				err := survey.AskOne(prompt, &userInput)
 				if err != nil {
 					if err == terminal.InterruptErr {

internal/cmd/database/delete.go

@@ -39,13 +39,16 @@ func DeleteCmd(cfg *config.Config) *cobra.Command {
 			name := args[0]
 
 			if !force {
-				userInput := ""
+				if !cmdutil.IsTTY {
+					return fmt.Errorf("Cannot confirm deletion of database %q (run with -force to override)", name)
+				}
 				confirmationMessage := fmt.Sprintf("%s %s %s", cmdutil.Bold("Please type"), cmdutil.BoldBlue(name), cmdutil.Bold("to confirm:"))
 
 				prompt := &survey.Input{
 					Message: confirmationMessage,
 				}
 
+				var userInput string
 				err := survey.AskOne(prompt, &userInput)
 				if err != nil {
 					if err == terminal.InterruptErr {

internal/cmd/merge/merge.go

@@ -38,6 +38,10 @@ func MergeCmd(cfg *config.Config) *cobra.Command {
 			// If mergeInto is blank, then we need to prompt the user to select a
 			// branch.
 			if mergeInto == "" {
+				if !cmdutil.IsTTY {
+					return fmt.Errorf("no '-into' branch given")
+				}
+
 				err := selectBranch(ctx, client, fromBranch, &mergeInto, database, cfg.Organization)
 				if err != nil {
 					return err

internal/cmd/org/switch.go

@@ -44,7 +44,7 @@ func SwitchCmd(cfg *config.Config) *cobra.Command {
 				}
 				end()
 				organization = org.Name
-			} else if len(args) == 0 {
+			} else if len(args) == 0 && cmdutil.IsTTY {
 				// Get organization names to show the user
 				end := cmdutil.PrintProgress("Fetching organizations...")
 				defer end()

internal/cmdutil/browser.go

@@ -12,6 +12,9 @@ const ApplicationURL = "https://app.planetscaledb.io"
 
 // OpenBrowser opens a web browser at the specified url.
 func OpenBrowser(goos, url string) *exec.Cmd {
+	if !IsTTY {
+		panic("OpenBrowser called without a TTY")
+	}
 	exe := "open"
 	var args []string
 	switch goos {

internal/cmdutil/terminal.go

@@ -7,10 +7,25 @@ import (
 
 	"github.com/briandowns/spinner"
 	"github.com/fatih/color"
+	"github.com/mattn/go-isatty"
 )
 
+var IsTTY = isatty.IsTerminal(os.Stdout.Fd()) || isatty.IsCygwinTerminal(os.Stdout.Fd())
+
+func Emoji(emoji string) string {
+	if IsTTY {
+		return emoji
+	}
+	return ""
+}
+
 // PrintProgress starts a spinner with the relevant message.
 func PrintProgress(message string) func() {
+	if !IsTTY {
+		fmt.Println(message)
+		return func() {}
+	}
+
 	// Output to STDERR so we don't polluate STDOUT.
 	s := spinner.New(spinner.CharSets[14], 100*time.Millisecond, spinner.WithWriter(os.Stderr))
 	s.Suffix = fmt.Sprintf(" %s", message)
@@ -24,10 +39,12 @@ func PrintProgress(message string) func() {
 
 // BoldBlue returns a string formatted with blue and bold.
 func BoldBlue(msg string) string {
+	// the 'color' package already handles IsTTY gracefully
 	return color.New(color.FgBlue).Add(color.Bold).Sprint(msg)
 }
 
 // Bold returns a string formatted with bold.
 func Bold(msg string) string {
+	// the 'color' package already handles IsTTY gracefully
 	return color.New(color.Bold).Sprint(msg)
 }

internal/promptutil/branch.go

@@ -2,12 +2,12 @@ package promptutil
 
 import (
 	"context"
-	"errors"
 	"fmt"
-	"time"
 
 	"github.com/AlecAivazis/survey/v2"
 	ps "github.com/planetscale/planetscale-go/planetscale"
+
+	"github.com/planetscale/cli/internal/cmdutil"
 )
 
 // GetBranch returns the database branch. If there is only one branch, it
@@ -31,42 +31,22 @@ func GetBranch(ctx context.Context, client *ps.Client, org, db string) (string,
 		return branches[0].Name, nil
 	}
 
-	branchNames := make([]string, 0, len(branches)-1)
-	for _, b := range branches {
-		branchNames = append(branchNames, b.Name)
-	}
-
-	prompt := &survey.Select{
-		Message: "Select a branch to connect to:",
-		Options: branchNames,
-		VimMode: true,
-	}
-
-	type result struct {
-		branch string
-		err    error
-	}
-
-	resp := make(chan result)
+	if cmdutil.IsTTY {
+		branchNames := make([]string, 0, len(branches)-1)
+		for _, b := range branches {
+			branchNames = append(branchNames, b.Name)
+		}
 
-	go func() {
-		var branch string
-		err := survey.AskOne(prompt, &branch)
-		resp <- result{
-			branch: branch,
-			err:    err,
+		prompt := &survey.Select{
+			Message: "Select a branch to connect to:",
+			Options: branchNames,
+			VimMode: true,
 		}
-	}()
 
-	// timeout so CLI is not blocked forever if the user accidently called it
-	select {
-	case <-time.After(time.Minute * 5):
-		// TODO(fatih): this is buggy. Because there is no proper cancellation
-		// in the survey.AskOne() function, it holds to stdin, which causes the
-		// terminal to malfunction. But the timeout is not intended for regular
-		// users, it's meant to catch script invocations, so let's still use it.
-		return "", errors.New("pscale connect timeout: no branch is selected")
-	case r := <-resp:
-		return r.branch, r.err
+		var branch string
+		err = survey.AskOne(prompt, &branch)
+		return branch, err
 	}
+
+	return "", fmt.Errorf("more than one branch exists for database %q", db)
 }