mirror of
https://github.com/gohugoio/hugo.git
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f9978ed164
This commit pulls most of the image related logic into its own package, to make it easier to reason about and extend.
This is also a rewrite of the transformation logic used in Hugo Pipes, mostly to allow constructs like the one below:
{{ ($myimg | fingerprint ).Width }}
Fixes #5903
Fixes #6234
Fixes #6266
74 lines
2.4 KiB
Go
74 lines
2.4 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package templates contains functions for template processing of Resource objects.
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package templates
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import (
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"github.com/gohugoio/hugo/helpers"
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"github.com/gohugoio/hugo/resources"
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"github.com/gohugoio/hugo/resources/internal"
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"github.com/gohugoio/hugo/resources/resource"
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"github.com/gohugoio/hugo/tpl"
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"github.com/pkg/errors"
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)
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// Client contains methods to perform template processing of Resource objects.
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type Client struct {
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rs *resources.Spec
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textTemplate tpl.TemplateParseFinder
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}
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// New creates a new Client with the given specification.
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func New(rs *resources.Spec, textTemplate tpl.TemplateParseFinder) *Client {
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if rs == nil {
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panic("must provice a resource Spec")
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}
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if textTemplate == nil {
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panic("must provide a textTemplate")
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}
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return &Client{rs: rs, textTemplate: textTemplate}
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}
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type executeAsTemplateTransform struct {
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rs *resources.Spec
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textTemplate tpl.TemplateParseFinder
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targetPath string
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data interface{}
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}
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func (t *executeAsTemplateTransform) Key() internal.ResourceTransformationKey {
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return internal.NewResourceTransformationKey("execute-as-template", t.targetPath)
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}
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func (t *executeAsTemplateTransform) Transform(ctx *resources.ResourceTransformationCtx) error {
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tplStr := helpers.ReaderToString(ctx.From)
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templ, err := t.textTemplate.Parse(ctx.InPath, tplStr)
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if err != nil {
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return errors.Wrapf(err, "failed to parse Resource %q as Template:", ctx.InPath)
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}
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ctx.OutPath = t.targetPath
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return templ.Execute(ctx.To, t.data)
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}
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func (c *Client) ExecuteAsTemplate(res resources.ResourceTransformer, targetPath string, data interface{}) (resource.Resource, error) {
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return res.Transform(&executeAsTemplateTransform{
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rs: c.rs,
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targetPath: helpers.ToSlashTrimLeading(targetPath),
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textTemplate: c.textTemplate,
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data: data,
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})
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}
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