mirror of
https://github.com/vbatts/go-mtree.git
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85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
package mtree
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import (
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"fmt"
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"io"
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"path/filepath"
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"sort"
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"strings"
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)
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// DirectoryHierarchy is the mapped structure for an mtree directory hierarchy
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// spec
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type DirectoryHierarchy struct {
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Entries []Entry
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}
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// WriteTo simplifies the output of the resulting hierarchy spec
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func (dh DirectoryHierarchy) WriteTo(w io.Writer) (n int64, err error) {
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sort.Sort(byPos(dh.Entries))
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var sum int64
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for _, e := range dh.Entries {
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i, err := io.WriteString(w, e.String()+"\n")
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if err != nil {
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return sum, err
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}
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sum += int64(i)
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}
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return sum, nil
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}
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type byPos []Entry
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func (bp byPos) Len() int { return len(bp) }
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func (bp byPos) Less(i, j int) bool { return bp[i].Pos < bp[j].Pos }
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func (bp byPos) Swap(i, j int) { bp[i], bp[j] = bp[j], bp[i] }
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// Entry is each component of content in the mtree spec file
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type Entry struct {
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Parent, Child *Entry // up, down
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Prev, Next *Entry // left, right
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Set *Entry // current `/set` for additional keywords
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Pos int // order in the spec
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Raw string // file or directory name
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Name string // file or directory name
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Keywords []string // TODO(vbatts) maybe a keyword typed set of values?
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Type EntryType
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}
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func (e Entry) Path() string {
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if e.Parent == nil {
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return e.Name
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}
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return filepath.Join(e.Parent.Path(), e.Name)
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}
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func (e Entry) String() string {
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if e.Raw != "" {
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return e.Raw
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}
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if e.Type == BlankType {
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return ""
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}
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if e.Type == DotDotType {
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return e.Name
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}
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// TODO(vbatts) if type is RelativeType and a keyword of not type=dir
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if e.Type == SpecialType || e.Type == FullType || inSlice("type=dir", e.Keywords) {
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return fmt.Sprintf("%s %s", e.Name, strings.Join(e.Keywords, " "))
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}
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return fmt.Sprintf(" %s %s", e.Name, strings.Join(e.Keywords, " "))
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}
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// EntryType are the formats of lines in an mtree spec file
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type EntryType int
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// The types of lines to be found in an mtree spec file
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const (
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SignatureType EntryType = iota // first line of the file, like `#mtree v2.0`
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BlankType // blank lines are ignored
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CommentType // Lines beginning with `#` are ignored
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SpecialType // line that has `/` prefix issue a "special" command (currently only /set and /unset)
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RelativeType // if the first white-space delimited word does not have a '/' in it. Options/keywords are applied.
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DotDotType // .. - A relative path step. keywords/options are ignored
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FullType // if the first word on the line has a `/` after the first character, it interpretted as a file pathname with options
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)
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