providers/import: Add ability for templates to read step.meta

providers/import/import.go

@@ -2,15 +2,17 @@ package impor
 
 import "fmt"
 import "errors"
+import "slices"
 import "strings"
 import "html/template"
 import "git.tebibyte.media/sashakoshka/step"
 
 var _ step.FuncProviderFor = new(Provider)
+var _ step.Configurable = new(Provider)
 
 // Provider provides import functions.
 type Provider struct {
-	
+	config step.Meta
 }
 
 // Package fulfills the step.Provider interface.
@@ -18,9 +20,14 @@ func (this *Provider) Package () string {
 	return "import"
 }
 
+func (this *Provider) Configure (config step.Meta) error {
+	return nil
+}
+
 // FuncMapFor fulfills the step.FuncProviderFor interface.
 func (this *Provider) FuncMapFor (document *step.Document) template.FuncMap {
 	stat := &state {
+		config:   this.config,
 		document: document,
 	}
 	return template.FuncMap {
@@ -31,10 +38,13 @@ func (this *Provider) FuncMapFor (document *step.Document) template.FuncMap {
 		"execute":     stat.funcExecute,
 		"include":     stat.funcInclude,
 		"includeHTML": stat.funcIncludeHTML,
+		"config":      stat.funcConfig,
+		"configList":  stat.funcConfigList,
 	}
 }
 
 type state struct {
+	config   step.Meta
 	document *step.Document
 }
 
@@ -86,3 +96,14 @@ func (this *state) funcIncludeHTML (name string, data any) (template.HTML, error
 	if err != nil { return "", err }
 	return result.Body, nil
 }
+
+func (this *state) funcConfig (key string) string {
+	if this.config == nil { return "" }
+	return this.config.Get(key)
+}
+
+func (this *state) funcConfigList (key string) []string {
+	if this.config == nil { return nil }
+	// config is considered immutable, time to enforce it
+	return slices.Clone(this.config[key])
+}