156 lines
3.3 KiB
Go
156 lines
3.3 KiB
Go
package goldsmith
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"time"
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)
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type (
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FileProp any
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FileProps map[string]FileProp
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// File represents in-memory or on-disk files in a chain.
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File struct {
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relPath string
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props FileProps
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modTime time.Time
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size int64
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dataPath string
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reader *bytes.Reader
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index int
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}
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)
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// Rename modifies the file path relative to the source directory.
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func (self *File) Rename(path string) error {
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if filepath.IsAbs(path) {
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return fmt.Errorf("unexpected absolute path: %s", path)
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}
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self.relPath = path
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return nil
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}
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// Path returns the file path relative to the source directory.
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func (self *File) Path() string {
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return filepath.ToSlash(self.relPath)
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}
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// Dir returns the containing directory of the file.
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func (self *File) Dir() string {
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return filepath.ToSlash(filepath.Dir(self.relPath))
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}
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// Name returns the base name of the file.
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func (self *File) Name() string {
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return filepath.Base(self.relPath)
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}
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// Ext returns the extension of the file.
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func (self *File) Ext() string {
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return filepath.Ext(self.relPath)
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}
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// Size returns the file length in bytes.
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func (self *File) Size() int64 {
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return self.size
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}
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// ModTime returns the time of the file's last modification.
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func (self *File) ModTime() time.Time {
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return self.modTime
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}
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// Read reads file data into the provided buffer.
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func (self *File) Read(data []byte) (int, error) {
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if err := self.load(); err != nil {
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return 0, err
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}
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return self.reader.Read(data)
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}
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// Write writes file data into the provided writer.
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func (self *File) WriteTo(writer io.Writer) (int64, error) {
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if err := self.load(); err != nil {
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return 0, err
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}
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return self.reader.WriteTo(writer)
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}
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// Seek updates the file pointer to the desired position.
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func (self *File) Seek(offset int64, whence int) (int64, error) {
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if self.reader == nil && offset == 0 && (whence == io.SeekStart || whence == io.SeekCurrent) {
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return 0, nil
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}
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if err := self.load(); err != nil {
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return 0, err
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}
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return self.reader.Seek(offset, whence)
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}
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// GoString returns value for string formatting.
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func (self *File) GoString() string {
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return self.relPath
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}
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// RemoveProp deletes the metadata property for the provided name.
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func (self *File) RemoveProp(name string) {
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delete(self.props, name)
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}
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// SetProp updates the metadata property for the provided name.
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func (self *File) SetProp(name string, value FileProp) {
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self.props[name] = value
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}
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// Prop returns the metadata property for the provided name.
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func (self *File) Prop(name string) (FileProp, bool) {
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value, ok := self.props[name]
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return value, ok
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}
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// PropOrDef returns the metadata property for the provided name or the default.
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func (self *File) PropOrDef(name string, valueDef FileProp) FileProp {
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if value, ok := self.Prop(name); ok {
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return value
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}
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return valueDef
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}
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// Props returns all of the metadata properties.
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func (self *File) Props() FileProps {
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return self.props
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}
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// CopyProps copies all metadata properties from the provided file.
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func (self *File) CopyProps(file *File) {
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for key, value := range file.props {
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self.props[key] = value
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}
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}
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func (self *File) load() error {
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if self.reader != nil {
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return nil
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}
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data, err := os.ReadFile(self.dataPath)
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if err != nil {
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return err
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}
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self.reader = bytes.NewReader(data)
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return nil
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}
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