Add logging provider

document.go

@@ -91,6 +91,12 @@ func (this *Document) Rel (name string) (string, error) {
 	return name, nil
 }
 
+// Name returns the document's name, which is a path relative to its
+// environment.
+func (this *Document) Name () string {
+	return this.name
+}
+
 func (this *Document) dir () string {
 	directory := this.name
 	ext := filepath.Ext(directory)

providers/all.go

@@ -2,6 +2,7 @@ package providers
 
 import            "git.tebibyte.media/sashakoshka/step"
 import fpos       "git.tebibyte.media/sashakoshka/step/providers/os"
+import fplog      "git.tebibyte.media/sashakoshka/step/providers/log"
 import fphttp     "git.tebibyte.media/sashakoshka/step/providers/http"
 import fppath     "git.tebibyte.media/sashakoshka/step/providers/path"
 import fpmime     "git.tebibyte.media/sashakoshka/step/providers/mime"
@@ -15,6 +16,7 @@ import fpmarkdown "git.tebibyte.media/sashakoshka/step/providers/markdown"
 func All () []step.Provider {
 	return []step.Provider {
 		new(fpos.Provider),
+		new(fplog.Provider),
 		new(fphttp.Provider),
 		new(fppath.Provider),
 		new(fpmime.Provider),

providers/log/log.go

@@ -0,0 +1,44 @@
+package log
+
+import "fmt"
+import "log"
+import "html/template"
+import "git.tebibyte.media/sashakoshka/step"
+
+var _ step.FuncProviderFor = new(Provider)
+
+// Provider provides MIME functions.
+type Provider struct {
+	
+}
+
+// Package fulfills the step.Provider interface.
+func (this *Provider) Package () string {
+	return "mime"
+}
+
+// FuncMapFor fulfills the step.FuncProviderFor interface.
+func (this *Provider) FuncMapFor (document *step.Document) template.FuncMap {
+	stat := &state {
+		document: document,
+	}
+	return template.FuncMap {
+		"println": stat.funcPrintln,
+		"errorln": stat.funcPrintln,
+		"debugln": stat.funcDebugln,
+	}
+}
+
+type state struct {
+	document *step.Document
+}
+
+func (this *state) funcPrintln (v ...any) string {
+	log.Printf("(i) %s: %s", this.document.Name, fmt.Sprintln(v))
+	return ""
+}
+
+func (this *state) funcDebugln (v ...any) string {
+	log.Printf("DBG %s: %s", this.document.Name, fmt.Sprintln(v))
+	return ""
+}