47 lines
1.8 KiB
Go
47 lines
1.8 KiB
Go
package static
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import (
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"encoding/json"
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"html/template"
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)
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// Assets represents a group of assets to be included inside a template.
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//
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// Assets are generated using the 'build.mjs' script.
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// The script is called using 'go:generate', which stores variables in the form of 'Assets{{Name}}' inside this package.
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//
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// The build script roughly works as follows:
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// - Delete any previously generated distribution directory.
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// - Bundle the entrypoint sources under 'src/entry/{{Name}}/index.{ts,css}' together with the base './src/base/index.{ts,css}'
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// - Store the output inside the 'dist' directory
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// - Generate new constants of the form {{Name}}
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//
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// Each asset group should be registered as a parameter to the 'go:generate' line.
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type Assets struct {
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Scripts string // <script> tags inserted by the asset
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Styles string // <link> tags inserted by the asset
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}
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//go:generate node build.mjs HomeHome ControlIndex ControlInstance
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// MustParse parses a new template from the given source
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// and registers the Asset functions to it.
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// See [Assets.RegisterFuncs].
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func (assets *Assets) MustParse(value string) *template.Template {
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return template.Must(assets.RegisterFuncs(template.New("")).Parse(value))
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}
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// RegisterFuncs registers three new template functions called "JS", "CSS" and "json".
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//
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// "JS" and "CSS" take no arguments, and return appropriate tags to be inserted into html.
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// json takes a single argument of any type, and returns it's encoding as a string to be inserted into the page.
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func (assets *Assets) RegisterFuncs(t *template.Template) *template.Template {
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return t.Funcs(template.FuncMap{
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"JS": func() template.HTML { return template.HTML(assets.Scripts) },
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"CSS": func() template.HTML { return template.HTML(assets.Styles) },
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"json": func(data any) (string, error) {
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bytes, err := json.Marshal(data)
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return string(bytes), err
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},
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})
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}
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