providers/os: Add listFilesDate function to list files by date

providers/os/os.go

@@ -2,6 +2,8 @@ package os
 
 import "os"
 import "io"
+import "time"
+import "sort"
 import "io/fs"
 import "html/template"
 import "git.tebibyte.media/sashakoshka/step"
@@ -32,6 +34,7 @@ func (this *Provider) FuncMapFor (document *step.Document) template.FuncMap {
 		"readFile":      stat.funcReadFile,
 		"readDir":       stat.funcReadDir,
 		"listFiles":     stat.funcListFiles,
+		"listFilesDate": stat.funcListFilesDate,
 		"writeFile":     stat.funcWriteFile,
 		"appendFile":    stat.funcAppendFile,
 		"renameFile":    stat.funcRenameFile,
@@ -94,6 +97,29 @@ func (this *state) funcReadDir (name string) ([]fs.DirEntry, error) {
 }
 
 func (this *state) funcListFiles (name string) ([]string, error) {
+	name, err := this.document.Rel(name)
+	if err != nil { return nil, err }
+	entries, err := os.ReadDir(name)
+	if err != nil { return nil, err }
+	sort.Slice(entries, func(left, right int) bool{
+		var leftTime time.Time
+		if leftInfo, err := entries[left].Info(); err != nil {
+			leftTime = leftInfo.ModTime()
+		}
+		var rightTime time.Time
+		if rightInfo, err := entries[right].Info(); err != nil {
+			rightTime = rightInfo.ModTime()
+		}
+		return leftTime.Before(rightTime)
+	})
+	strings := make([]string, len(entries))
+	for index, entry := range entries {
+		strings[index] = entry.Name()
+	}
+	return strings, nil
+}
+
+func (this *state) funcListFilesDate (name string) ([]string, error) {
 	name, err := this.document.Rel(name)
 	if err != nil { return nil, err }
 	entries, err := os.ReadDir(name)