✨ Added new functions module

functions/README.md

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+# Functions
+Various useful utilities for Hugo static generated site.
+
+## Install
+### Config
+[Import module](https://gohugo.io/hugo-modules/use-modules/#use-a-module-for-a-theme) in your site
+configuration:
+
+```yaml
+imports:
+  - path: gitlab.com/toby3d/hugo/functions
+```
+
+## Usage
+### `srcset`
+Generates the `srcset` attribute for adaptive image resources. Takes an image resource as an argument and returns an attribute with references to alternate sizes of that resource. If no alternate resources can be generated based on the settings, an empty string will be returned.
+
+#### Config
+Add the following parameters to the site configuration. The example below shows the default values:
+
+```yaml
+params:
+  imaging:
+    min: 50 # Minimum width for generated images
+    max: 1000 # Maximum width for generated images
+    count: 20 # Maximum number of generated images
+```
+
+#### Usage
+```html
+{{- $image := resources.GetMatch "sample" -}}
+<img src="{{ $image.Permalink }}" {{ partial "functions/srcset" $image | safeHTMLAttr }} loading="lazy" />
+```
+
+#### Result
+```html
+<img src="https://example.com/images/image.jpg" srcset="https://example.com/images/image_hu163a76a9d5551ae508ac1b34fee2c6dc_611848_960x0_resize_box_2.png 960w, https://example.com/images/image_hu163a76a9d5551ae508ac1b34fee2c6dc_611848_480x0_resize_box_2.png 480w, https://example.com/images/image_hu163a76a9d5551ae508ac1b34fee2c6dc_611848_240x0_resize_box_2.png 240w" />
+```
+
+### `wbr`
+Renders long URLs with hyphenation tags. See «[Better Line Breaks for Long URLs](https://css-tricks.com/better-line-breaks-for-long-urls/)».
+
+#### Usage
+```html
+{{ partial "functions/wbr" $.Page.Permalink | safeHTML }}
+```
+
+#### Result
+```html
+http:<wbr>//<wbr>www<wbr>.<wbr>example<wbr>.com<wbr>/<wbr>s/<wbr>ref<wbr>=<wbr>sr<wbr>_<wbr>nr<wbr>_<wbr>i<wbr>_o<wbr>
+```

functions/config.yaml

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+---
+module:
+  hugoVersion:
+    extended: true
+    min: "0.81.0"
+  mounts:
+  - source: layouts/partials
+    target: layouts/partials/functions

functions/go.mod

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+module gitlab.com/toby3d/hugo/functions
+
+go 1.16

functions/layouts/partials/srcset.html

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+{{- $params := dict
+  "min" (default site.Params.imaging.min 200)
+  "max" (default site.Params.imaging.max 1400)
+  "count" (default site.Params.imaging.count 20)
+-}}
+
+{{- $original := . -}}
+{{- $result := slice -}}
+{{- $width := $original.Width -}}
+
+{{- range $step := seq $params.count -}}
+  {{- $width = div $width 2 -}}
+  
+  {{- if and (ge $width $params.min) (le $width $params.max) -}}
+    {{- $image := $original.Resize (printf "%dx" $width) -}}
+    {{- $result = $result | append (printf "%s %dw" (absURL $image.RelPermalink) $image.Width) -}}
+  {{- end -}}
+{{- end -}}
+
+{{- return (cond (ge (len $result) 1) (printf "srcset=\"%s\"" (delimit $result ", ")) "") -}}

functions/layouts/partials/wbr.html

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+{{- $result := slice -}}
+
+{{- range (split . "//") -}}
+  {{- $str := replaceRE "(\\:)" "$1<wbr>" . -}}
+  {{- $str = replaceRE "([\\/\\~\\.\\,\\-\\_\\?\\#\\%])" "<wbr>$1" $str -}}
+  {{- $result = $result | append (replaceRE "([\\=\\&])" "<wbr>$1<wbr>" $str) -}}
+{{- end -}}
+
+{{- return (delimit $result "//<wbr>") -}}