Autocompletion: fix panic by downgrading posener/complete to v1

Author: tucksaun

completion.go

@@ -7,7 +7,10 @@ import (
 	"os"
 	"runtime/debug"
 
-	"github.com/posener/complete/v2"
+	"github.com/pkg/errors"
+	"github.com/posener/complete"
+	"github.com/rs/zerolog"
+	"github.com/symfony-cli/terminal"
 )
 
 func init() {
@@ -47,41 +50,50 @@ func registerAutocompleteCommands(a *Application) {
 }
 
 func AutocompleteAppAction(c *Context) error {
+	// connect posener/complete logger to our logging facilities
+	logger := terminal.Logger.WithLevel(zerolog.DebugLevel)
+	complete.Log = func(format string, args ...interface{}) {
+		logger.Msgf("completion | "+format, args...)
+	}
+
 	cmd := complete.Command{
-		Flags: map[string]complete.Predictor{},
-		Sub:   map[string]*complete.Command{},
+		GlobalFlags: make(complete.Flags),
+		Sub:         make(complete.Commands),
 	}
 
 	// transpose registered commands and flags to posener/complete equivalence
 	for _, command := range c.App.VisibleCommands() {
 		subCmd := command.convertToPosenerCompleteCommand(c)
 
 		for _, name := range command.Names() {
-			cmd.Sub[name] = &subCmd
+			cmd.Sub[name] = subCmd
 		}
 	}
 
 	for _, f := range c.App.VisibleFlags() {
 		if vf, ok := f.(*verbosityFlag); ok {
-			vf.addToPosenerFlags(c, cmd.Flags)
+			vf.addToPosenerFlags(c, cmd.GlobalFlags)
 			continue
 		}
 
 		predictor := ContextPredictor{f, c}
 
 		for _, name := range f.Names() {
 			name = fmt.Sprintf("%s%s", prefixFor(name), name)
-			cmd.Flags[name] = predictor
+			cmd.GlobalFlags[name] = predictor
 		}
 	}
 
-	cmd.Complete(c.App.HelpName)
+	if !complete.New(c.App.HelpName, cmd).Complete() {
+		return errors.New("Could not run auto-completion")
+	}
+
 	return nil
 }
 
 func (c *Command) convertToPosenerCompleteCommand(ctx *Context) complete.Command {
 	command := complete.Command{
-		Flags: map[string]complete.Predictor{},
+		Flags: make(complete.Flags, 0),
 	}
 
 	for _, f := range c.VisibleFlags() {
@@ -98,16 +110,16 @@ func (c *Command) convertToPosenerCompleteCommand(ctx *Context) complete.Command
 	return command
 }
 
-func (c *Command) PredictArgs(ctx *Context, prefix string) []string {
+func (c *Command) PredictArgs(ctx *Context, a complete.Args) []string {
 	if c.ShellComplete != nil {
-		return c.ShellComplete(ctx, prefix)
+		return c.ShellComplete(ctx, a)
 	}
 
 	return nil
 }
 
 type Predictor interface {
-	PredictArgs(*Context, string) []string
+	PredictArgs(*Context, complete.Args) []string
 }
 
 // ContextPredictor determines what terms can follow a command or a flag
@@ -119,6 +131,6 @@ type ContextPredictor struct {
 }
 
 // Predict invokes the predict function and implements the Predictor interface
-func (p ContextPredictor) Predict(prefix string) []string {
-	return p.predictor.PredictArgs(p.ctx, prefix)
+func (p ContextPredictor) Predict(a complete.Args) []string {
+	return p.predictor.PredictArgs(p.ctx, a)
 }

completion_installer.go

@@ -12,6 +12,7 @@ import (
 	"text/template"
 
 	"github.com/pkg/errors"
+	"github.com/posener/complete"
 	"github.com/symfony-cli/terminal"
 )
 
@@ -27,7 +28,7 @@ var shellAutoCompleteInstallCommand = &Command{
 		{Name: "completion"},
 	},
 	Usage: "Dumps the completion script for the current shell",
-	ShellComplete: func(*Context, string) []string {
+	ShellComplete: func(context *Context, c complete.Args) []string {
 		return []string{"bash", "zsh", "fish"}
 	},
 	Description: `The <info>{{.HelpName}}</> command dumps the shell completion script required

flag.go

@@ -33,6 +33,7 @@ import (
 	"time"
 
 	"github.com/pkg/errors"
+	"github.com/posener/complete"
 	"github.com/symfony-cli/terminal"
 )
 
@@ -93,7 +94,7 @@ func (f FlagsByName) Swap(i, j int) {
 type Flag interface {
 	fmt.Stringer
 
-	PredictArgs(*Context, string) []string
+	PredictArgs(*Context, complete.Args) []string
 	Validate(*Context) error
 	// Apply Flag settings to the given flag set
 	Apply(*flag.FlagSet)