Use interactive prompt to select resource to run if not specified (#762)

## Changes

Display an interactive prompt with a list of resources to run if one
isn't specified and the command is run interactively.

## Tests

Manually confirmed:
* The new prompt works
* Shell completion still works
* Specifying a key argument still works

bundle/run/job.go

@@ -95,6 +95,13 @@ type jobRunner struct {
 	job    *resources.Job
 }
 
+func (r *jobRunner) Name() string {
+	if r.job == nil || r.job.JobSettings == nil {
+		return ""
+	}
+	return r.job.JobSettings.Name
+}
+
 func isFailed(task jobs.RunTask) bool {
 	return task.State.LifeCycleState == jobs.RunLifeCycleStateInternalError ||
 		(task.State.LifeCycleState == jobs.RunLifeCycleStateTerminated &&

bundle/run/keys.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 
 	"github.com/databricks/cli/bundle"
+	"golang.org/x/exp/maps"
 )
 
 // RunnerLookup maps identifiers to a list of workloads that match that identifier.
@@ -32,18 +33,20 @@ func ResourceKeys(b *bundle.Bundle) (keyOnly RunnerLookup, keyWithType RunnerLoo
 	return
 }
 
-// ResourceCompletions returns a list of keys that unambiguously reference resources in the bundle.
-func ResourceCompletions(b *bundle.Bundle) []string {
-	seen := make(map[string]bool)
-	comps := []string{}
+// ResourceCompletionMap returns a map of resource keys to their respective names.
+func ResourceCompletionMap(b *bundle.Bundle) map[string]string {
+	out := make(map[string]string)
 	keyOnly, keyWithType := ResourceKeys(b)
 
+	// Keep track of resources we have seen by their fully qualified key.
+	seen := make(map[string]bool)
+
 	// First add resources that can be identified by key alone.
 	for k, v := range keyOnly {
 		// Invariant: len(v) >= 1. See [ResourceKeys].
 		if len(v) == 1 {
 			seen[v[0].Key()] = true
-			comps = append(comps, k)
+			out[k] = v[0].Name()
 		}
 	}
 
@@ -54,8 +57,13 @@ func ResourceCompletions(b *bundle.Bundle) []string {
 		if ok {
 			continue
 		}
-		comps = append(comps, k)
+		out[k] = v[0].Name()
 	}
 
-	return comps
+	return out
+}
+
+// ResourceCompletions returns a list of keys that unambiguously reference resources in the bundle.
+func ResourceCompletions(b *bundle.Bundle) []string {
+	return maps.Keys(ResourceCompletionMap(b))
 }

bundle/run/pipeline.go

@@ -136,6 +136,13 @@ type pipelineRunner struct {
 	pipeline *resources.Pipeline
 }
 
+func (r *pipelineRunner) Name() string {
+	if r.pipeline == nil || r.pipeline.PipelineSpec == nil {
+		return ""
+	}
+	return r.pipeline.PipelineSpec.Name
+}
+
 func (r *pipelineRunner) Run(ctx context.Context, opts *Options) (output.RunOutput, error) {
 	var pipelineID = r.pipeline.ID
 

bundle/run/runner.go

@@ -21,6 +21,9 @@ type Runner interface {
 	// This is used for showing the user hints w.r.t. disambiguation.
 	Key() string
 
+	// Name returns the resource's name, if defined.
+	Name() string
+
 	// Run the underlying worklow.
 	Run(ctx context.Context, opts *Options) (output.RunOutput, error)
 }

cmd/bundle/run.go

@@ -9,6 +9,7 @@ import (
 	"github.com/databricks/cli/bundle/phases"
 	"github.com/databricks/cli/bundle/run"
 	"github.com/databricks/cli/cmd/root"
+	"github.com/databricks/cli/libs/cmdio"
 	"github.com/databricks/cli/libs/flags"
 	"github.com/spf13/cobra"
 )
@@ -16,9 +17,9 @@ import (
 func newRunCommand() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "run [flags] KEY",
-		Short: "Run a workload (e.g. a job or a pipeline)",
+		Short: "Run a resource (e.g. a job or a pipeline)",
 
-		Args:    cobra.ExactArgs(1),
+		Args:    cobra.MaximumNArgs(1),
 		PreRunE: ConfigureBundleWithVariables,
 	}
 
@@ -29,9 +30,10 @@ func newRunCommand() *cobra.Command {
 	cmd.Flags().BoolVar(&noWait, "no-wait", false, "Don't wait for the run to complete.")
 
 	cmd.RunE = func(cmd *cobra.Command, args []string) error {
-		b := bundle.Get(cmd.Context())
+		ctx := cmd.Context()
+		b := bundle.Get(ctx)
 
-		err := bundle.Apply(cmd.Context(), b, bundle.Seq(
+		err := bundle.Apply(ctx, b, bundle.Seq(
 			phases.Initialize(),
 			terraform.Interpolate(),
 			terraform.Write(),
@@ -42,13 +44,31 @@ func newRunCommand() *cobra.Command {
 			return err
 		}
 
+		// If no arguments are specified, prompt the user to select something to run.
+		if len(args) == 0 && cmdio.IsInteractive(ctx) {
+			// Invert completions from KEY -> NAME, to NAME -> KEY.
+			inv := make(map[string]string)
+			for k, v := range run.ResourceCompletionMap(b) {
+				inv[v] = k
+			}
+			id, err := cmdio.Select(ctx, inv, "Resource to run")
+			if err != nil {
+				return err
+			}
+			args = append(args, id)
+		}
+
+		if len(args) != 1 {
+			return fmt.Errorf("expected a KEY of the resource to run")
+		}
+
 		runner, err := run.Find(b, args[0])
 		if err != nil {
 			return err
 		}
 
 		runOptions.NoWait = noWait
-		output, err := runner.Run(cmd.Context(), &runOptions)
+		output, err := runner.Run(ctx, &runOptions)
 		if err != nil {
 			return err
 		}