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template.go
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template.go
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// Copyright 2018 Drone.IO 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 template
import (
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/aymerick/raymond"
"github.com/pkg/errors"
)
// Render parses and executes a template, returning the results in string
// format. Trailing or leading spaces or new-lines are not getting truncated. It
// is able to read templates from remote paths, local files or directly from the
// string.
func Render(template string, payload interface{}) (s string, err error) {
u, err := url.Parse(template)
if err == nil {
switch u.Scheme {
case "http", "https":
res, err := http.Get(template)
if err != nil {
return s, errors.Wrap(err, "failed to fetch")
}
defer res.Body.Close()
out, err := ioutil.ReadAll(res.Body)
if err != nil {
return s, errors.Wrap(err, "failed to read")
}
template = string(out)
case "file":
out, err := ioutil.ReadFile(u.Path)
if err != nil {
return s, errors.Wrap(err, "failed to read")
}
template = string(out)
}
}
return raymond.Render(template, payload)
}
// RenderTrim parses and executes a template, returning the results in string
// format. The result is trimmed to remove left and right padding and newlines
// that may be added unintentially in the template markup.
func RenderTrim(template string, playload interface{}) (string, error) {
out, err := Render(template, playload)
return strings.Trim(out, " \n"), err
}