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Add color previews in markdown (#21474)

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* Resolves #3047

Every time a color code will be in \`backticks`, a cute little color
preview will pop up


[Inspiration](https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#supported-color-models)

#### Before

![image](https://user-images.githubusercontent.com/20454870/196631524-298afbbf-d2c8-4018-92a5-0393a693d850.png)

#### After

![image](https://user-images.githubusercontent.com/20454870/196631397-36c561e4-08f5-465a-a36e-76084e30b08a.png)

Signed-off-by: Yarden Shoham <hrsi88@gmail.com>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
Yarden Shoham
2022-10-21 15:00:53 +03:00
committed by GitHub
parent 16cbd5b59c
commit e828564445
5 changed files with 143 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
modules/markup/sanitizer.go
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@@ -55,6 +55,9 @@ func createDefaultPolicy() *bluemonday.Policy {
// For JS code copy and Mermaid loading state
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^code-block( is-loading)?$`)).OnElements("pre")
// For color preview
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^color-preview$`)).OnElements("span")
// For Chroma markdown plugin
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^(chroma )?language-[\w-]+( display)?( is-loading)?$`)).OnElements("code")
@@ -88,8 +91,8 @@ func createDefaultPolicy() *bluemonday.Policy {
// Allow 'style' attribute on text elements.
policy.AllowAttrs("style").OnElements("span", "p")
// Allow 'color' property for the style attribute on text elements.
policy.AllowStyles("color").OnElements("span", "p")
// Allow 'color' and 'background-color' properties for the style attribute on text elements.
policy.AllowStyles("color", "background-color").OnElements("span", "p")
// Allow generally safe attributes
generalSafeAttrs := []string{