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tpl: Add imageConfig function

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Add imageConfig function which calls image.DecodeConfig and returns the height, width and color mode of the image. (#2677)

This allows for more advanced image shortcodes and templates such as those required by AMP.

layouts/shortcodes/amp-img.html
```
{{ $src := .Get "src" }}
{{ $config := imageConfig (printf "/static/%s" $src) }}

<amp-img src="{{$src}}"
           height="{{$config.Height}}"
           width="{{$config.Width}}"
           layout="responsive">
</amp-img>
```
This commit is contained in:
Tristan Rice 2016-11-16 04:00:45 -08:00 committed by Bjørn Erik Pedersen
parent 774bd324b8
commit 87dea02b02
1 changed files with 11 additions and 1 deletions
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12
content/templates/functions.md
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@ -356,7 +356,7 @@ e.g.
{{ .Content }} {{ .Content }}
{{ end }} {{ end }}
## Files ## Files
### readDir ### readDir
@ -372,6 +372,16 @@ Reads a file from disk and converts it into a string. Note that the filename mus
`{{readFile "README.txt"}}` → `"Hugo Rocks!"` `{{readFile "README.txt"}}` → `"Hugo Rocks!"`
### imageConfig
Parses the image and returns the height, width and color model.
e.g.
```
{{ with (imageConfig "favicon.ico") }}
favicon.ico: {{.Width}} x {{.Height}}
{{ end }}
```
## Math ## Math
<table class="table table-bordered"> <table class="table table-bordered">