Add GSP project manifest and design layout

toolkit/internal/gsp/manifest.go

@@ -0,0 +1,58 @@
+package gsp
+
+import (
+	"os"
+	"path/filepath"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Manifest struct {
+	GSPVersion     string               `json:"gspVersion,omitempty" yaml:"gspVersion"`
+	ToolkitVersion string               `json:"toolkitVersion,omitempty" yaml:"toolkitVersion"`
+	Project        string               `json:"project,omitempty" yaml:"project"`
+	Entry          []string             `json:"entry,omitempty" yaml:"entry"`
+	Scan           []string             `json:"scan,omitempty" yaml:"scan"`
+	StageRules     map[string]StageRule `json:"stageRules,omitempty" yaml:"stageRules"`
+	Types          []string             `json:"types,omitempty" yaml:"types"`
+	Output         string               `json:"output,omitempty" yaml:"output"`
+	File           string               `json:"file,omitempty" yaml:"-"`
+}
+
+type StageRule struct {
+	MinResolution string `json:"minResolution,omitempty" yaml:"minResolution"`
+}
+
+func loadManifest(root string) (*Manifest, error) {
+	path := filepath.Join(root, "gsp.manifest")
+	data, err := os.ReadFile(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	var manifest Manifest
+	if err := yaml.Unmarshal(data, &manifest); err != nil {
+		return nil, err
+	}
+	manifest.File = relPath(root, path)
+	return &manifest, nil
+}
+
+func (m *Manifest) scanEntries() []string {
+	if m == nil || len(m.Scan) == 0 {
+		return []string{"design"}
+	}
+	return m.Scan
+}
+
+func (m *Manifest) minResolution(stage string) (string, bool) {
+	if m != nil && m.StageRules != nil {
+		if rule, ok := m.StageRules[stage]; ok && rule.MinResolution != "" {
+			return rule.MinResolution, true
+		}
+	}
+	value, ok := defaultStageRules[stage]
+	return value, ok
+}