267 lines
4.9 KiB
Go
267 lines
4.9 KiB
Go
/*
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* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package goldsmith
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import (
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"os"
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"path"
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"path/filepath"
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"sync"
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"sync/atomic"
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)
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type stage struct {
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gs *goldsmith
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input, output chan *File
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err error
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}
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type goldsmith struct {
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srcDir, dstDir string
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stages []*stage
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refs map[string]bool
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mtx sync.Mutex
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count int32
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}
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func (gs *goldsmith) queueFiles() {
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files := make(chan string)
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go scanDir(gs.srcDir, files, nil)
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s := gs.newStage()
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go func() {
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defer close(s.output)
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for path := range files {
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relPath, err := filepath.Rel(gs.srcDir, path)
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if err != nil {
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panic(err)
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}
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file := NewFile(relPath)
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var f *os.File
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if f, file.Err = os.Open(path); file.Err == nil {
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_, file.Err = file.Buff.ReadFrom(f)
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f.Close()
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}
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s.output <- file
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}
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}()
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}
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func (gs *goldsmith) cleanupFiles() {
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var (
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files = make(chan string)
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dirs = make(chan string)
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)
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go scanDir(gs.dstDir, files, dirs)
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for files != nil || dirs != nil {
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var (
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path string
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ok bool
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)
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select {
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case path, ok = <-files:
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if !ok {
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files = nil
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continue
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}
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case path, ok = <-dirs:
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if !ok {
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dirs = nil
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continue
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}
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default:
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continue
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}
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relPath, err := filepath.Rel(gs.dstDir, path)
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if err != nil {
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panic(err)
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}
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if contained, _ := gs.refs[relPath]; contained {
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continue
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}
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os.RemoveAll(path)
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}
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}
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func (gs *goldsmith) exportFile(file *File) {
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defer func() {
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file.Buff.Reset()
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gs.decFiles()
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}()
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if file.Err != nil {
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return
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}
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absPath := filepath.Join(gs.dstDir, file.Path)
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if file.Err = os.MkdirAll(path.Dir(absPath), 0755); file.Err != nil {
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return
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}
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var f *os.File
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if f, file.Err = os.Create(absPath); file.Err == nil {
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defer f.Close()
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if _, file.Err = f.Write(file.Buff.Bytes()); file.Err == nil {
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gs.refFile(file.Path)
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}
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}
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}
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func (gs *goldsmith) refFile(path string) {
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gs.mtx.Lock()
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defer gs.mtx.Unlock()
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if gs.refs == nil {
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gs.refs = make(map[string]bool)
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}
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path = cleanPath(path)
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for {
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gs.refs[path] = true
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if path == "." {
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break
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}
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path = filepath.Dir(path)
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}
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}
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func (gs *goldsmith) incFiles() {
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atomic.AddInt32(&gs.count, 1)
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}
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func (gs *goldsmith) decFiles() {
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atomic.AddInt32(&gs.count, -1)
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}
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func (gs *goldsmith) newStage() *stage {
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s := &stage{
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gs: gs,
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output: make(chan *File),
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}
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if len(gs.stages) > 0 {
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s.input = gs.stages[len(gs.stages)-1].output
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}
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gs.stages = append(gs.stages, s)
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return s
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}
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func (gs *goldsmith) chain(s *stage, p Plugin) {
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defer close(s.output)
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if init, ok := p.(Initializer); ok {
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if s.err = init.Initialize(s); s.err != nil {
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return
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}
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}
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accept, _ := p.(Accepter)
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proc, _ := p.(Processor)
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fin, _ := p.(Finalizer)
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var (
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wg sync.WaitGroup
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mtx sync.Mutex
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files []*File
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)
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dispatch := func(f *File) {
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if fin == nil {
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s.output <- f
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} else {
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mtx.Lock()
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files = append(files, f)
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mtx.Unlock()
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}
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}
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for file := range s.input {
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if file.Err != nil || proc == nil || (accept != nil && !accept.Accept(file)) {
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dispatch(file)
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} else {
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wg.Add(1)
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go func(f *File) {
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defer wg.Done()
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if proc.Process(s, f) {
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dispatch(f)
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} else {
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gs.decFiles()
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}
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}(file)
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}
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}
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wg.Wait()
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if fin != nil {
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if s.err = fin.Finalize(s, files); s.err == nil {
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for _, file := range files {
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s.output <- file
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}
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}
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}
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}
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func (gs *goldsmith) Chain(p Plugin) Goldsmith {
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go gs.chain(gs.newStage(), p)
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return gs
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}
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func (gs *goldsmith) Complete() ([]*File, []error) {
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s := gs.stages[len(gs.stages)-1]
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var files []*File
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for file := range s.output {
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gs.exportFile(file)
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files = append(files, file)
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}
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gs.cleanupFiles()
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var errs []error
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for _, s := range gs.stages {
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if s.err != nil {
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errs = append(errs, s.err)
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}
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}
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gs.stages = nil
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gs.refs = nil
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return files, errs
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}
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