feat: experiments logging improvements (#2049)

* feat: warn when enabling inactive experiments

* feat: TASK_ environment prefix

* feat: calculate experiment enabled/active instead of storing

* refactor: rename GetTaskVar to GetTaskEnv

* feat: experiments tests

cmd/task/task.go

@@ -69,7 +69,7 @@ func run() error {
 	}
 
 	if flags.Experiments {
-		return experiments.List(log)
+		return log.PrintExperiments()
 	}
 
 	if flags.Init {
@@ -109,6 +109,10 @@ func run() error {
 		dir = home
 	}
 
+	if err := experiments.Validate(); err != nil {
+		log.Warnf("%s\n", err.Error())
+	}
+
 	var taskSorter sort.TaskSorter
 	switch flags.TaskSort {
 	case "none":
@@ -154,9 +158,6 @@ func run() error {
 	if err != nil {
 		return err
 	}
-	if experiments.AnyVariables.Enabled {
-		log.Warnf("The 'Any Variables' experiment flag is no longer required to use non-map variable types. If you wish to use map variables, please use 'TASK_X_MAP_VARIABLES' instead. See https://github.com/go-task/task/issues/1585\n")
-	}
 
 	// If the download flag is specified, we should stop execution as soon as
 	// taskfile is downloaded

internal/env/env.go

@@ -8,6 +8,8 @@ import (
 	"github.com/go-task/task/v3/taskfile/ast"
 )
 
+const taskVarPrefix = "TASK_"
+
 func Get(t *ast.Task) []string {
 	if t.Env == nil {
 		return nil
@@ -23,7 +25,7 @@ func GetFromVars(env *ast.Vars) []string {
 		if !isTypeAllowed(v) {
 			continue
 		}
-		if !experiments.EnvPrecedence.Enabled {
+		if !experiments.EnvPrecedence.Enabled() {
 			if _, alreadySet := os.LookupEnv(k); alreadySet {
 				continue
 			}
@@ -42,3 +44,7 @@ func isTypeAllowed(v any) bool {
 		return false
 	}
 }
+
+func GetTaskEnv(key string) string {
+	return os.Getenv(taskVarPrefix + key)
+}

internal/experiments/errors.go

@@ -0,0 +1,32 @@
+package experiments
+
+import (
+	"fmt"
+	"strings"
+)
+
+type InvalidValueError struct {
+	Name          string
+	AllowedValues []string
+	Value         string
+}
+
+func (err InvalidValueError) Error() string {
+	return fmt.Sprintf(
+		"task: Experiment %q has an invalid value %q (allowed values: %s)",
+		err.Name,
+		err.Value,
+		strings.Join(err.AllowedValues, ", "),
+	)
+}
+
+type InactiveError struct {
+	Name string
+}
+
+func (err InactiveError) Error() string {
+	return fmt.Sprintf(
+		"task: Experiment %q is inactive and cannot be enabled",
+		err.Name,
+	)
+}

internal/experiments/experiment.go

@@ -0,0 +1,56 @@
+package experiments
+
+import (
+	"fmt"
+	"slices"
+)
+
+type Experiment struct {
+	Name          string   // The name of the experiment.
+	AllowedValues []string // The values that can enable this experiment.
+	Value         string   // The version of the experiment that is enabled.
+}
+
+// New creates a new experiment with the given name and sets the values that can
+// enable it.
+func New(xName string, allowedValues ...string) Experiment {
+	value := getEnv(xName)
+	x := Experiment{
+		Name:          xName,
+		AllowedValues: allowedValues,
+		Value:         value,
+	}
+	xList = append(xList, x)
+	return x
+}
+
+func (x *Experiment) Enabled() bool {
+	return slices.Contains(x.AllowedValues, x.Value)
+}
+
+func (x *Experiment) Active() bool {
+	return len(x.AllowedValues) > 0
+}
+
+func (x Experiment) Valid() error {
+	if !x.Active() && x.Value != "" {
+		return &InactiveError{
+			Name: x.Name,
+		}
+	}
+	if !x.Enabled() && x.Value != "" {
+		return &InvalidValueError{
+			Name:          x.Name,
+			AllowedValues: x.AllowedValues,
+			Value:         x.Value,
+		}
+	}
+	return nil
+}
+
+func (x Experiment) String() string {
+	if x.Enabled() {
+		return fmt.Sprintf("on (%s)", x.Value)
+	}
+	return "off"
+}

internal/experiments/experiment_test.go

@@ -0,0 +1,74 @@
+package experiments_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/go-task/task/v3/internal/experiments"
+)
+
+func TestNew(t *testing.T) {
+	const (
+		exampleExperiment    = "EXAMPLE"
+		exampleExperimentEnv = "TASK_X_EXAMPLE"
+	)
+	tests := []struct {
+		name          string
+		allowedValues []string
+		value         string
+		wantEnabled   bool
+		wantActive    bool
+		wantValid     error
+	}{
+		{
+			name:        `[] allowed, value=""`,
+			wantEnabled: false,
+			wantActive:  false,
+		},
+		{
+			name:        `[] allowed, value="1"`,
+			value:       "1",
+			wantEnabled: false,
+			wantActive:  false,
+			wantValid: &experiments.InactiveError{
+				Name: exampleExperiment,
+			},
+		},
+		{
+			name:          `[1] allowed, value=""`,
+			allowedValues: []string{"1"},
+			wantEnabled:   false,
+			wantActive:    true,
+		},
+		{
+			name:          `[1] allowed, value="1"`,
+			allowedValues: []string{"1"},
+			value:         "1",
+			wantEnabled:   true,
+			wantActive:    true,
+		},
+		{
+			name:          `[1] allowed, value="2"`,
+			allowedValues: []string{"1"},
+			value:         "2",
+			wantEnabled:   false,
+			wantActive:    true,
+			wantValid: &experiments.InvalidValueError{
+				Name:          exampleExperiment,
+				AllowedValues: []string{"1"},
+				Value:         "2",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Setenv(exampleExperimentEnv, tt.value)
+			x := experiments.New(exampleExperiment, tt.allowedValues...)
+			assert.Equal(t, exampleExperiment, x.Name)
+			assert.Equal(t, tt.wantEnabled, x.Enabled())
+			assert.Equal(t, tt.wantActive, x.Active())
+			assert.Equal(t, tt.wantValid, x.Valid())
+		})
+	}
+}

internal/experiments/experiments.go

@@ -2,28 +2,17 @@ package experiments
 
 import (
 	"fmt"
-	"io"
 	"os"
 	"path/filepath"
-	"slices"
 	"strings"
 
-	"github.com/Ladicle/tabwriter"
 	"github.com/joho/godotenv"
 	"github.com/spf13/pflag"
-
-	"github.com/go-task/task/v3/internal/logger"
 )
 
 const envPrefix = "TASK_X_"
 
-type Experiment struct {
-	Name    string
-	Enabled bool
-	Value   string
-}
-
-// A list of experiments.
+// A set of experiments that can be enabled or disabled.
 var (
 	GentleForce     Experiment
 	RemoteTaskfiles Experiment
@@ -32,32 +21,31 @@ var (
 	EnvPrecedence   Experiment
 )
 
+// An internal list of all the initialized experiments used for iterating.
+var xList []Experiment
+
 func init() {
 	readDotEnv()
-	GentleForce = New("GENTLE_FORCE")
-	RemoteTaskfiles = New("REMOTE_TASKFILES")
-	AnyVariables = New("ANY_VARIABLES", "1", "2")
+	GentleForce = New("GENTLE_FORCE", "1")
+	RemoteTaskfiles = New("REMOTE_TASKFILES", "1")
+	AnyVariables = New("ANY_VARIABLES")
 	MapVariables = New("MAP_VARIABLES", "1", "2")
-	EnvPrecedence = New("ENV_PRECEDENCE")
+	EnvPrecedence = New("ENV_PRECEDENCE", "1")
 }
 
-func New(xName string, enabledValues ...string) Experiment {
-	if len(enabledValues) == 0 {
-		enabledValues = []string{"1"}
-	}
-	value := getEnv(xName)
-	return Experiment{
-		Name:    xName,
-		Enabled: slices.Contains(enabledValues, value),
-		Value:   value,
+// Validate checks if any experiments have been enabled while being inactive.
+// If one is found, the function returns an error.
+func Validate() error {
+	for _, x := range List() {
+		if err := x.Valid(); err != nil {
+			return err
+		}
 	}
+	return nil
 }
 
-func (x Experiment) String() string {
-	if x.Enabled {
-		return fmt.Sprintf("on (%s)", x.Value)
-	}
-	return "off"
+func List() []Experiment {
+	return xList
 }
 
 func getEnv(xName string) string {
@@ -95,18 +83,3 @@ func readDotEnv() {
 		}
 	}
 }
-
-func printExperiment(w io.Writer, l *logger.Logger, x Experiment) {
-	l.FOutf(w, logger.Yellow, "* ")
-	l.FOutf(w, logger.Green, x.Name)
-	l.FOutf(w, logger.Default, ": \t%s\n", x.String())
-}
-
-func List(l *logger.Logger) error {
-	w := tabwriter.NewWriter(os.Stdout, 0, 8, 0, ' ', 0)
-	printExperiment(w, l, GentleForce)
-	printExperiment(w, l, RemoteTaskfiles)
-	printExperiment(w, l, MapVariables)
-	printExperiment(w, l, EnvPrecedence)
-	return w.Flush()
-}

internal/flags/flags.go

@@ -10,6 +10,7 @@ import (
 	"github.com/spf13/pflag"
 
 	"github.com/go-task/task/v3/errors"
+	"github.com/go-task/task/v3/internal/env"
 	"github.com/go-task/task/v3/internal/experiments"
 	"github.com/go-task/task/v3/taskfile/ast"
 )
@@ -79,7 +80,7 @@ func init() {
 		log.Print(usage)
 		pflag.PrintDefaults()
 	}
-	offline, err := strconv.ParseBool(cmp.Or(os.Getenv("TASK_OFFLINE"), "false"))
+	offline, err := strconv.ParseBool(cmp.Or(env.GetTaskEnv("OFFLINE"), "false"))
 	if err != nil {
 		offline = false
 	}
@@ -115,7 +116,7 @@ func init() {
 	pflag.BoolVar(&Experiments, "experiments", false, "Lists all the available experiments and whether or not they are enabled.")
 
 	// Gentle force experiment will override the force flag and add a new force-all flag
-	if experiments.GentleForce.Enabled {
+	if experiments.GentleForce.Enabled() {
 		pflag.BoolVarP(&Force, "force", "f", false, "Forces execution of the directly called task.")
 		pflag.BoolVar(&ForceAll, "force-all", false, "Forces execution of the called task and all its dependant tasks.")
 	} else {
@@ -123,7 +124,7 @@ func init() {
 	}
 
 	// Remote Taskfiles experiment will adds the "download" and "offline" flags
-	if experiments.RemoteTaskfiles.Enabled {
+	if experiments.RemoteTaskfiles.Enabled() {
 		pflag.BoolVar(&Download, "download", false, "Downloads a cached version of a remote Taskfile.")
 		pflag.BoolVar(&Offline, "offline", offline, "Forces Task to only use local or cached Taskfiles.")
 		pflag.DurationVar(&Timeout, "timeout", time.Second*10, "Timeout for downloading remote Taskfiles.")

internal/logger/logger.go

@@ -8,9 +8,12 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/Ladicle/tabwriter"
 	"github.com/fatih/color"
 
 	"github.com/go-task/task/v3/errors"
+	"github.com/go-task/task/v3/internal/env"
+	"github.com/go-task/task/v3/internal/experiments"
 	"github.com/go-task/task/v3/internal/term"
 )
 
@@ -19,70 +22,86 @@ var (
 	ErrNoTerminal      = errors.New("no terminal")
 )
 
+var (
+	attrsReset       = envColor("COLOR_RESET", color.Reset)
+	attrsFgBlue      = envColor("COLOR_BLUE", color.FgBlue)
+	attrsFgGreen     = envColor("COLOR_GREEN", color.FgGreen)
+	attrsFgCyan      = envColor("COLOR_CYAN", color.FgCyan)
+	attrsFgYellow    = envColor("COLOR_YELLOW", color.FgYellow)
+	attrsFgMagenta   = envColor("COLOR_MAGENTA", color.FgMagenta)
+	attrsFgRed       = envColor("COLOR_RED", color.FgRed)
+	attrsFgHiBlue    = envColor("COLOR_BRIGHT_BLUE", color.FgHiBlue)
+	attrsFgHiGreen   = envColor("COLOR_BRIGHT_GREEN", color.FgHiGreen)
+	attrsFgHiCyan    = envColor("COLOR_BRIGHT_CYAN", color.FgHiCyan)
+	attrsFgHiYellow  = envColor("COLOR_BRIGHT_YELLOW", color.FgHiYellow)
+	attrsFgHiMagenta = envColor("COLOR_BRIGHT_MAGENTA", color.FgHiMagenta)
+	attrsFgHiRed     = envColor("COLOR_BRIGHT_RED", color.FgHiRed)
+)
+
 type (
 	Color     func() PrintFunc
 	PrintFunc func(io.Writer, string, ...any)
 )
 
 func Default() PrintFunc {
-	return color.New(envColor("TASK_COLOR_RESET", color.Reset)...).FprintfFunc()
+	return color.New(attrsReset...).FprintfFunc()
 }
 
 func Blue() PrintFunc {
-	return color.New(envColor("TASK_COLOR_BLUE", color.FgBlue)...).FprintfFunc()
+	return color.New(attrsFgBlue...).FprintfFunc()
 }
 
 func Green() PrintFunc {
-	return color.New(envColor("TASK_COLOR_GREEN", color.FgGreen)...).FprintfFunc()
+	return color.New(attrsFgGreen...).FprintfFunc()
 }
 
 func Cyan() PrintFunc {
-	return color.New(envColor("TASK_COLOR_CYAN", color.FgCyan)...).FprintfFunc()
+	return color.New(attrsFgCyan...).FprintfFunc()
 }
 
 func Yellow() PrintFunc {
-	return color.New(envColor("TASK_COLOR_YELLOW", color.FgYellow)...).FprintfFunc()
+	return color.New(attrsFgYellow...).FprintfFunc()
 }
 
 func Magenta() PrintFunc {
-	return color.New(envColor("TASK_COLOR_MAGENTA", color.FgMagenta)...).FprintfFunc()
+	return color.New(attrsFgMagenta...).FprintfFunc()
 }
 
 func Red() PrintFunc {
-	return color.New(envColor("TASK_COLOR_RED", color.FgRed)...).FprintfFunc()
+	return color.New(attrsFgRed...).FprintfFunc()
 }
 
 func BrightBlue() PrintFunc {
-	return color.New(envColor("TASK_COLOR_BRIGHT_BLUE", color.FgHiBlue)...).FprintfFunc()
+	return color.New(attrsFgHiBlue...).FprintfFunc()
 }
 
 func BrightGreen() PrintFunc {
-	return color.New(envColor("TASK_COLOR_BRIGHT_GREEN", color.FgHiGreen)...).FprintfFunc()
+	return color.New(attrsFgHiGreen...).FprintfFunc()
 }
 
 func BrightCyan() PrintFunc {
-	return color.New(envColor("TASK_COLOR_BRIGHT_CYAN", color.FgHiCyan)...).FprintfFunc()
+	return color.New(attrsFgHiCyan...).FprintfFunc()
 }
 
 func BrightYellow() PrintFunc {
-	return color.New(envColor("TASK_COLOR_BRIGHT_YELLOW", color.FgHiYellow)...).FprintfFunc()
+	return color.New(attrsFgHiYellow...).FprintfFunc()
 }
 
 func BrightMagenta() PrintFunc {
-	return color.New(envColor("TASK_COLOR_BRIGHT_MAGENTA", color.FgHiMagenta)...).FprintfFunc()
+	return color.New(attrsFgHiMagenta...).FprintfFunc()
 }
 
 func BrightRed() PrintFunc {
-	return color.New(envColor("TASK_COLOR_BRIGHT_RED", color.FgHiRed)...).FprintfFunc()
+	return color.New(attrsFgHiRed...).FprintfFunc()
 }
 
-func envColor(env string, defaultColor color.Attribute) []color.Attribute {
+func envColor(name string, defaultColor color.Attribute) []color.Attribute {
 	if os.Getenv("FORCE_COLOR") != "" {
 		color.NoColor = false
 	}
 
 	// Fetch the environment variable
-	override := os.Getenv(env)
+	override := env.GetTaskEnv(name)
 
 	// First, try splitting the string by commas (RGB shortcut syntax) and if it
 	// matches, then prepend the 256-color foreground escape sequence.
@@ -195,3 +214,16 @@ func (l *Logger) Prompt(color Color, prompt string, defaultValue string, continu
 
 	return nil
 }
+
+func (l *Logger) PrintExperiments() error {
+	w := tabwriter.NewWriter(l.Stdout, 0, 8, 0, ' ', 0)
+	for _, x := range experiments.List() {
+		if !x.Active() {
+			continue
+		}
+		l.FOutf(w, Yellow, "* ")
+		l.FOutf(w, Green, x.Name)
+		l.FOutf(w, Default, ": \t%s\n", x.String())
+	}
+	return w.Flush()
+}

setup.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/go-task/task/v3/errors"
 	"github.com/go-task/task/v3/internal/compiler"
+	"github.com/go-task/task/v3/internal/env"
 	"github.com/go-task/task/v3/internal/execext"
 	"github.com/go-task/task/v3/internal/filepathext"
 	"github.com/go-task/task/v3/internal/logger"
@@ -109,13 +110,14 @@ func (e *Executor) setupTempDir() error {
 		return nil
 	}
 
-	if os.Getenv("TASK_TEMP_DIR") == "" {
+	tempDir := env.GetTaskEnv("TEMP_DIR")
+	if tempDir == "" {
 		e.TempDir = TempDir{
 			Remote:      filepathext.SmartJoin(e.Dir, ".task"),
 			Fingerprint: filepathext.SmartJoin(e.Dir, ".task"),
 		}
-	} else if filepath.IsAbs(os.Getenv("TASK_TEMP_DIR")) || strings.HasPrefix(os.Getenv("TASK_TEMP_DIR"), "~") {
-		tempDir, err := execext.Expand(os.Getenv("TASK_TEMP_DIR"))
+	} else if filepath.IsAbs(tempDir) || strings.HasPrefix(tempDir, "~") {
+		tempDir, err := execext.Expand(tempDir)
 		if err != nil {
 			return err
 		}
@@ -128,14 +130,15 @@ func (e *Executor) setupTempDir() error {
 
 	} else {
 		e.TempDir = TempDir{
-			Remote:      filepathext.SmartJoin(e.Dir, os.Getenv("TASK_TEMP_DIR")),
-			Fingerprint: filepathext.SmartJoin(e.Dir, os.Getenv("TASK_TEMP_DIR")),
+			Remote:      filepathext.SmartJoin(e.Dir, tempDir),
+			Fingerprint: filepathext.SmartJoin(e.Dir, tempDir),
 		}
 	}
 
-	if os.Getenv("TASK_REMOTE_DIR") != "" {
-		if filepath.IsAbs(os.Getenv("TASK_REMOTE_DIR")) || strings.HasPrefix(os.Getenv("TASK_REMOTE_DIR"), "~") {
-			remoteTempDir, err := execext.Expand(os.Getenv("TASK_REMOTE_DIR"))
+	remoteDir := env.GetTaskEnv("REMOTE_DIR")
+	if remoteDir != "" {
+		if filepath.IsAbs(remoteDir) || strings.HasPrefix(remoteDir, "~") {
+			remoteTempDir, err := execext.Expand(remoteDir)
 			if err != nil {
 				return err
 			}

task_test.go

@@ -3327,12 +3327,11 @@ func TestVarInheritance(t *testing.T) {
 // because the experiment settings are parsed during experiments.init(), before any tests run.
 func enableExperimentForTest(t *testing.T, e *experiments.Experiment, val string) {
 	t.Helper()
-
 	prev := *e
 	*e = experiments.Experiment{
-		Name:    prev.Name,
-		Enabled: true,
-		Value:   val,
+		Name:          prev.Name,
+		AllowedValues: []string{val},
+		Value:         val,
 	}
 	t.Cleanup(func() { *e = prev })
 }

taskfile/ast/var.go

@@ -175,7 +175,7 @@ type Var struct {
 }
 
 func (v *Var) UnmarshalYAML(node *yaml.Node) error {
-	if experiments.MapVariables.Enabled {
+	if experiments.MapVariables.Enabled() {
 
 		// This implementation is not backwards-compatible and replaces the 'sh' key with map variables
 		if experiments.MapVariables.Value == "1" {

taskfile/node.go

@@ -64,7 +64,7 @@ func NewNode(
 
 	}
 
-	if node.Remote() && !experiments.RemoteTaskfiles.Enabled {
+	if node.Remote() && !experiments.RemoteTaskfiles.Enabled() {
 		return nil, errors.New("task: Remote taskfiles are not enabled. You can read more about this experiment and how to enable it at https://taskfile.dev/experiments/remote-taskfiles")
 	}
 	return node, err