github.com/kovansky/hugo@v0.92.3-0.20220224232819-63076e4ff19f/tpl/diagrams/diagrams.go (about)

     1  // Copyright 2022 The Hugo Authors. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package diagrams
    15  
    16  import (
    17  	"bytes"
    18  	"html/template"
    19  	"io"
    20  	"strings"
    21  
    22  	"github.com/bep/goat"
    23  	"github.com/gohugoio/hugo/deps"
    24  	"github.com/spf13/cast"
    25  )
    26  
    27  type SVGDiagram interface {
    28  	Body() template.HTML
    29  	SVG() template.HTML
    30  	Width() int
    31  	Height() int
    32  }
    33  
    34  type goatDiagram struct {
    35  	d goat.SVG
    36  }
    37  
    38  func (d goatDiagram) Body() template.HTML {
    39  	return template.HTML(d.d.Body)
    40  }
    41  
    42  func (d goatDiagram) SVG() template.HTML {
    43  	return template.HTML(d.d.String())
    44  }
    45  
    46  func (d goatDiagram) Width() int {
    47  	return d.d.Width
    48  }
    49  
    50  func (d goatDiagram) Height() int {
    51  	return d.d.Height
    52  }
    53  
    54  type Diagrams struct {
    55  	d *deps.Deps
    56  }
    57  
    58  func (d *Diagrams) Goat(v interface{}) SVGDiagram {
    59  	var r io.Reader
    60  
    61  	switch vv := v.(type) {
    62  	case io.Reader:
    63  		r = vv
    64  	case []byte:
    65  		r = bytes.NewReader(vv)
    66  	default:
    67  		r = strings.NewReader(cast.ToString(v))
    68  	}
    69  
    70  	return goatDiagram{
    71  		d: goat.BuildSVG(r),
    72  	}
    73  }