goldsmith/core.go

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/*
* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
* Author: Alex Yatskov <alex@foosoft.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package goldsmith
import (
"os"
"path/filepath"
"sync"
)
type goldsmith struct {
srcDir, dstDir string
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
errorMtx sync.Mutex
}
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func (gs *goldsmith) pushContext(plug Plugin) *context {
ctx := &context{gs: gs, plug: plug, output: make(chan *file)}
ctx.filters = append(ctx.filters, gs.filters...)
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if len(gs.contexts) > 0 {
ctx.input = gs.contexts[len(gs.contexts)-1].output
}
gs.contexts = append(gs.contexts, ctx)
return ctx
}
func (gs *goldsmith) cleanupFiles() {
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infos := make(chan fileInfo)
go scanDir(gs.dstDir, infos)
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for info := range infos {
relPath, _ := filepath.Rel(gs.dstDir, info.path)
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if contained, _ := gs.refs[relPath]; contained {
continue
}
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os.RemoveAll(info.path)
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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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pathSeg := cleanPath(f.path)
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for {
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gs.refs[pathSeg] = true
if pathSeg == "." {
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break
}
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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 {
ferr.Path = f.path
}
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gs.errors = append(gs.errors, ferr)
}
//
// Goldsmith Implementation
//
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func (gs *goldsmith) Chain(p Plugin) Goldsmith {
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if gs.complete {
panic("attempted reuse of goldsmith instance")
}
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gs.pushContext(p)
return gs
}
func (gs *goldsmith) FilterPush(f Filter) Goldsmith {
if gs.complete {
panic("attempted reuse of goldsmith instance")
}
gs.filters = append(gs.filters, f)
return gs
}
func (gs *goldsmith) FilterPop() Goldsmith {
if gs.complete {
panic("attempted reuse of goldsmith instance")
}
count := len(gs.filters)
if count == 0 {
panic("attempted to pop empty filter stack")
}
gs.filters = gs.filters[:count-1]
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return gs
}
func (gs *goldsmith) End(dstDir string) []error {
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if gs.complete {
panic("attempted reuse of goldsmith instance")
}
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gs.dstDir = dstDir
for _, ctx := range gs.contexts {
go ctx.chain()
}
ctx := gs.contexts[len(gs.contexts)-1]
for f := range ctx.output {
gs.exportFile(f)
}
gs.cleanupFiles()
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gs.complete = true
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return gs.errors
}