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loader.go
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loader.go
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// Copyright (C) 2017 Space Monkey, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package tmplutil
import (
"io/ioutil"
"os"
"path/filepath"
"text/template"
"bitbucket.org/pkg/inflect"
)
type Loader interface {
Load(name string, funcs template.FuncMap) (*template.Template, error)
}
type LoaderFunc func(name string, funcs template.FuncMap) (
*template.Template, error)
func (fn LoaderFunc) Load(name string, funcs template.FuncMap) (
*template.Template, error) {
return fn(name, funcs)
}
type dirLoader struct {
dir string
fallback Loader
}
func DirLoader(dir string, fallback Loader) Loader {
return dirLoader{
dir: dir,
fallback: fallback,
}
}
func (d dirLoader) Load(name string, funcs template.FuncMap) (
*template.Template, error) {
data, err := ioutil.ReadFile(filepath.Join(d.dir, name))
if err != nil {
if os.IsNotExist(err) {
return d.fallback.Load(name, funcs)
}
return nil, Error.Wrap(err)
}
return loadTemplate(name, data, funcs)
}
type BinLoader func(name string) ([]byte, error)
func (b BinLoader) Load(name string, funcs template.FuncMap) (
*template.Template, error) {
data, err := b(name)
if err != nil {
return nil, Error.Wrap(err)
}
return loadTemplate(name, data, funcs)
}
func loadTemplate(name string, data []byte, funcs template.FuncMap) (
*template.Template, error) {
if funcs == nil {
funcs = make(template.FuncMap)
}
safeset := func(name string, fn interface{}) {
if funcs[name] == nil {
funcs[name] = fn
}
}
safeset("pluralize", inflect.Pluralize)
safeset("singularize", inflect.Singularize)
safeset("camelize", inflect.Camelize)
safeset("cameldown", inflect.CamelizeDownFirst)
safeset("underscore", inflect.Underscore)
tmpl, err := template.New(name).Funcs(funcs).Parse(string(data))
return tmpl, Error.Wrap(err)
}