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transformer.go
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transformer.go
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// Copyright 2015 Davin Hills. All rights reserved.
// MIT license. License details can be found in the LICENSE file.
package goauto
import (
"path/filepath"
"strings"
)
// A Transformer is a function that changes a string to a string
// Transforms are used to build Targets in Tasks
// A common example would be to change myfile.scss to myfile.css
type Transformer func(string) string
// Identity returns itself
func Identity(f string) string {
return f
}
// GoRelBase returns the file path relative to $GOPATH
func GoRelBase(f string) string {
rd := GoRelDir(f)
return filepath.Join(rd, filepath.Base(f))
}
// GoRelDir returns the path relative to $GOPATH
func GoRelDir(f string) string {
gopaths := GoPaths()
for _, gp := range gopaths {
rel, err := filepath.Rel(gp, filepath.Dir(f))
if err == nil {
return rel
}
}
return ""
}
// GoRelSrcDir returns the path relative to $GOPATH/src
func GoRelSrcDir(f string) string {
gopaths := GoPaths()
for _, gp := range gopaths {
gp = filepath.Join(gp, "src")
rel, err := filepath.Rel(gp, filepath.Dir(f))
if err == nil {
return rel
}
}
return ""
}
// ExtTransformer returns a Transformer for chaning file extensions
func ExtTransformer(newExt string) Transformer {
return func(f string) string {
b := strings.TrimSuffix(f, filepath.Ext(f))
return b + "." + newExt
}
}