133 lines
2.3 KiB
Go
133 lines
2.3 KiB
Go
package goldsmith
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import (
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"os"
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"path/filepath"
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"sync"
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)
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type goldsmith struct {
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srcDir, dstDir string
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contexts []*context
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refs map[string]bool
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complete bool
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filters []Filter
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errors []error
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errorMtx sync.Mutex
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}
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func (gs *goldsmith) pushContext(plug Plugin) *context {
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ctx := &context{gs: gs, plug: plug, output: make(chan *file)}
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ctx.filters = append(ctx.filters, gs.filters...)
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if len(gs.contexts) > 0 {
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ctx.input = gs.contexts[len(gs.contexts)-1].output
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}
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gs.contexts = append(gs.contexts, ctx)
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return ctx
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}
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func (gs *goldsmith) cleanupFiles() {
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infos := make(chan fileInfo)
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go scanDir(gs.dstDir, infos)
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for info := range infos {
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relPath, _ := filepath.Rel(gs.dstDir, info.path)
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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(info.path)
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}
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}
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func (gs *goldsmith) exportFile(f *file) error {
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if err := f.export(gs.dstDir); err != nil {
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return err
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}
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pathSeg := cleanPath(f.path)
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for {
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gs.refs[pathSeg] = true
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if pathSeg == "." {
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break
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}
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pathSeg = filepath.Dir(pathSeg)
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}
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return nil
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}
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func (gs *goldsmith) fault(name string, f *file, err error) {
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gs.errorMtx.Lock()
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defer gs.errorMtx.Unlock()
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ferr := &Error{Name: name, Err: err}
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if f != nil {
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ferr.Path = f.path
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}
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gs.errors = append(gs.errors, ferr)
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}
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//
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// Goldsmith Implementation
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//
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func (gs *goldsmith) Chain(p Plugin) Goldsmith {
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if gs.complete {
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panic("attempted reuse of goldsmith instance")
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}
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gs.pushContext(p)
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return gs
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}
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func (gs *goldsmith) FilterPush(f Filter) Goldsmith {
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if gs.complete {
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panic("attempted reuse of goldsmith instance")
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}
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gs.filters = append(gs.filters, f)
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return gs
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}
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func (gs *goldsmith) FilterPop() Goldsmith {
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if gs.complete {
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panic("attempted reuse of goldsmith instance")
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}
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count := len(gs.filters)
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if count == 0 {
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panic("attempted to pop empty filter stack")
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}
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gs.filters = gs.filters[:count-1]
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return gs
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}
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func (gs *goldsmith) End(dstDir string) []error {
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if gs.complete {
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panic("attempted reuse of goldsmith instance")
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}
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gs.dstDir = dstDir
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for _, ctx := range gs.contexts {
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go ctx.step()
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}
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ctx := gs.contexts[len(gs.contexts)-1]
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for f := range ctx.output {
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gs.exportFile(f)
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}
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gs.cleanupFiles()
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gs.complete = true
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return gs.errors
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}
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