55 lines
1.5 KiB
Go
55 lines
1.5 KiB
Go
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package patch
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import "os"
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// An Op is a single operation to execute to apply a patch.
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type Op struct {
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Verb Verb // action
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Src string // source file
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Dst string // destination file
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Mode int // mode for destination (if non-zero)
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Data []byte // data for destination (if non-nil)
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}
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// Apply applies the patch set to the files named in the patch set,
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// constructing an in-memory copy of the new file state.
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// It is the client's job to write the changes to the file system
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// if desired.
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//
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// The function readFile should return the contents of the named file.
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// Typically this function will be io.ReadFile.
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//
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func (set *Set) Apply(readFile func(string) ([]byte, os.Error)) ([]Op, os.Error) {
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op := make([]Op, len(set.File))
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for i, f := range set.File {
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o := &op[i]
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o.Verb = f.Verb
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o.Src = f.Src
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o.Dst = f.Dst
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o.Mode = f.NewMode
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if f.Diff != NoDiff || o.Verb != Edit {
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// Clients assume o.Data == nil means no data diff.
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// Start with a non-nil data.
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var old []byte = make([]byte, 0) // not nil
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var err os.Error
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if f.Src != "" {
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old, err = readFile(f.Src)
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if err != nil {
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return nil, &os.PathError{string(f.Verb), f.Src, err}
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}
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}
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o.Data, err = f.Diff.Apply(old)
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if err != nil {
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return nil, &os.PathError{string(f.Verb), f.Src, err}
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}
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}
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}
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return op, nil
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}
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