/
render.go
74 lines (64 loc) · 1.92 KB
/
render.go
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// Copyright (c) 2016 Pulcy.
//
// 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 templates
import (
"bytes"
"os"
"strconv"
"text/template"
"github.com/juju/errgo"
logging "github.com/op/go-logging"
"github.com/pulcy/gluon/util"
)
var (
maskAny = errgo.MaskFunc(errgo.Any)
)
type TemplateConfigurator func(*template.Template)
// Render updates the given destinationPath according to the given template and options.
// Returns true if the file was created or changed, false if nothing has changed.
func Render(log *logging.Logger, templateName, destinationPath string, options interface{}, destinationFileMode os.FileMode, config ...TemplateConfigurator) (bool, error) {
asset, err := Asset(templateName)
if err != nil {
return false, maskAny(err)
}
// parse template
var tmpl *template.Template
tmpl = template.New(templateName)
funcMap := template.FuncMap{
"escape": escape,
"quote": strconv.Quote,
}
tmpl.Funcs(funcMap)
for _, c := range config {
c(tmpl)
}
_, err = tmpl.Parse(string(asset))
if err != nil {
return false, maskAny(err)
}
// execute template to buffer
buf := &bytes.Buffer{}
tmpl.Funcs(funcMap)
err = tmpl.Execute(buf, options)
if err != nil {
return false, maskAny(err)
}
// Update file
changed, err := util.UpdateFile(log, destinationPath, buf.Bytes(), destinationFileMode)
return changed, maskAny(err)
}
func escape(s string) string {
s = strconv.Quote(s)
return s[1 : len(s)-1]
}