dagger do action options flags

Signed-off-by: Joel Longtine <joel@dagger.io>

plan/action.go

@@ -2,6 +2,7 @@ package plan
 
 import (
 	"cuelang.org/go/cue"
+	"go.dagger.io/dagger/compiler"
 )
 
 type Action struct {
@@ -10,6 +11,14 @@ type Action struct {
 	Path          cue.Path
 	Documentation string
 	Children      []*Action
+	Value         *compiler.Value
+	inputs        []Input
+}
+
+type Input struct {
+	Name          string
+	Type          string
+	Documentation string
 }
 
 func (a *Action) AddChild(c *Action) {
@@ -31,3 +40,63 @@ func (a *Action) FindByPath(path cue.Path) *Action {
 	}
 	return nil
 }
+
+func (a *Action) FindClosest(path cue.Path) *Action {
+	if a.Path.String() == path.String() {
+		return a
+	}
+
+	commonSubPath := commonSubPath(a.Path, path)
+	if commonSubPath.String() == a.Path.String() {
+		if len(a.Children) > 0 {
+			for _, c := range a.Children {
+				if c.Path.String() == path.String() {
+					return c.FindClosest(path)
+				}
+			}
+		}
+		return a
+	}
+	return nil
+}
+
+func commonSubPath(a, b cue.Path) cue.Path {
+	if a.String() == b.String() {
+		return a
+	}
+	aSelectors := a.Selectors()
+	bSelectors := b.Selectors()
+	commonSelectors := []cue.Selector{}
+	for i := 0; i < len(aSelectors) && i < len(bSelectors); i++ {
+		if aSelectors[i].String() != bSelectors[i].String() {
+			break
+		}
+		commonSelectors = append(commonSelectors, aSelectors[i])
+	}
+	return cue.MakePath(commonSelectors...)
+}
+
+func (a *Action) Inputs() []Input {
+	if a.inputs == nil {
+		cueVal := a.Value.Cue()
+		inputs := []Input{}
+		for iter, _ := cueVal.Fields(cue.All()); iter.Next(); {
+			val := iter.Value()
+			cVal := compiler.Wrap(val)
+
+			_, refPath := val.ReferencePath()
+
+			ik := val.IncompleteKind()
+			validKind := ik == cue.StringKind || ik == cue.NumberKind || ik == cue.BoolKind || ik == cue.IntKind || ik == cue.FloatKind
+			if validKind && !val.IsConcrete() && len(refPath.Selectors()) == 0 {
+				inputs = append(inputs, Input{
+					Name:          iter.Label(),
+					Type:          ik.String(),
+					Documentation: cVal.DocSummary(),
+				})
+			}
+		}
+		a.inputs = inputs
+	}
+	return a.inputs
+}