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Add Markdown diagrams and render hooks for code blocks

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You can now create custom hook templates for code blocks, either one for all (`render-codeblock.html`) or for a given code language (e.g. `render-codeblock-go.html`).

We also used this new hook to add support for diagrams in Hugo:

* Goat (Go ASCII Tool) is built-in and enabled by default; just create a fenced code block with the language `goat` and start draw your Ascii diagrams.
* Another popular alternative for diagrams in Markdown, Mermaid (supported by GitHub), can also be implemented with a simple template. See the Hugo documentation for more information.

Updates #7765
Closes #9538
Fixes #9553
Fixes #8520
Fixes #6702
Fixes #9558
This commit is contained in:
Bjørn Erik Pedersen
2022-02-17 13:04:00 +01:00
parent 2c20f5bc00
commit 08fdca9d93
73 changed files with 1887 additions and 1986 deletions
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16
hugolib/site.go
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@@ -30,6 +30,7 @@ import (
"strings"
"time"
"github.com/gohugoio/hugo/common/hugio"
"github.com/gohugoio/hugo/common/types"
"github.com/gohugoio/hugo/modules"
"golang.org/x/text/unicode/norm"
@@ -54,12 +55,11 @@ import (
"github.com/gohugoio/hugo/common/maps"
"github.com/pkg/errors"
"github.com/gohugoio/hugo/common/text"
"github.com/gohugoio/hugo/common/hugo"
"github.com/gohugoio/hugo/publisher"
"github.com/pkg/errors"
_errors "github.com/pkg/errors"
"github.com/gohugoio/hugo/langs"
@@ -1773,19 +1773,23 @@ var infoOnMissingLayout = map[string]bool{
"404": true,
}
// hookRenderer is the canonical implementation of all hooks.ITEMRenderer,
// hookRendererTemplate is the canonical implementation of all hooks.ITEMRenderer,
// where ITEM is the thing being hooked.
type hookRenderer struct {
type hookRendererTemplate struct {
templateHandler tpl.TemplateHandler
identity.SearchProvider
templ tpl.Template
}
func (hr hookRenderer) RenderLink(w io.Writer, ctx hooks.LinkContext) error {
func (hr hookRendererTemplate) RenderLink(w io.Writer, ctx hooks.LinkContext) error {
return hr.templateHandler.Execute(hr.templ, w, ctx)
}
func (hr hookRenderer) RenderHeading(w io.Writer, ctx hooks.HeadingContext) error {
func (hr hookRendererTemplate) RenderHeading(w io.Writer, ctx hooks.HeadingContext) error {
return hr.templateHandler.Execute(hr.templ, w, ctx)
}
func (hr hookRendererTemplate) RenderCodeblock(w hugio.FlexiWriter, ctx hooks.CodeblockContext) error {
return hr.templateHandler.Execute(hr.templ, w, ctx)
}