implemented input scanner

Signed-off-by: Sam Alba <sam.alba@gmail.com>

dagger/environment.go

@@ -10,7 +10,6 @@ import (
 	"cuelang.org/go/cue"
 	cueflow "cuelang.org/go/tools/flow"
 	"dagger.io/go/dagger/compiler"
-	"dagger.io/go/pkg/cuetils"
 	"dagger.io/go/stdlib"
 
 	"github.com/opentracing/opentracing-go"
@@ -297,8 +296,8 @@ func newPipelineRunner(computed *compiler.Value, s Solver) cueflow.RunnerFunc {
 	})
 }
 
-func (e *Environment) ScanInputs() ([]cue.Value, error) {
-	vals, err := cuetils.ScanForInputs(e.plan.Cue())
+func (e *Environment) ScanInputs() ([]*compiler.Value, error) {
+	vals, err := ScanInputs(e.plan)
 	if err != nil {
 		return nil, err
 	}

dagger/inputs_scan.go

@@ -0,0 +1,82 @@
+package dagger
+
+import (
+	"fmt"
+
+	"cuelang.org/go/cue"
+	"dagger.io/go/dagger/compiler"
+)
+
+// func isReference(val cue.Value) bool {
+// 	_, ref := val.ReferencePath()
+// 	isRef := len(ref.Selectors()) > 0
+
+// 	if isRef {
+// 		return true
+// 	}
+
+// 	_, vals := val.Expr()
+// 	for _, v := range vals {
+// 		// walk recursively
+// 		if v.Path().String() == val.Path().String() {
+// 			// avoid loop by checking the same value
+// 			continue
+// 		}
+// 		return isReference(v)
+// 	}
+
+// 	return isRef
+// }
+
+// walk recursively to find references
+// func isReference(val cue.Value) bool {
+// 	_, vals := val.Expr()
+// 	for _, v := range vals {
+// 		// walk recursively
+// 		if v.Path().String() == val.Path().String() {
+// 			// avoid loop by checking the same value
+// 			continue
+// 		}
+// 		return isReference(v)
+// 	}
+
+// 	_, ref := val.ReferencePath()
+// 	return len(ref.Selectors()) > 0
+// }
+
+func isReference(val cue.Value) bool {
+	checkRef := func(vv cue.Value) bool {
+		_, ref := vv.ReferencePath()
+		return len(ref.Selectors()) > 0
+	}
+
+	_, vals := val.Expr()
+	for _, v := range vals {
+		if checkRef(v) {
+			return true
+		}
+	}
+
+	return checkRef(val)
+}
+
+func ScanInputs(value *compiler.Value) ([]*compiler.Value, error) {
+	vals := []*compiler.Value{}
+
+	value.Walk(
+		func(val *compiler.Value) bool {
+			// if isReference(val.Cue()) {
+			// 	fmt.Println("### isReference ->", val.Cue().Path())
+			// 	return false
+			// }
+
+			if val.HasAttr("input") && !isReference(val.Cue()) {
+				fmt.Printf("#### FOUND: %s\n", val.Path())
+				vals = append(vals, val)
+			}
+			return true
+		}, nil,
+	)
+
+	return vals, nil
+}