Add Alerts (#234)

* Add alert banners

Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de>

package.json

@@ -9,6 +9,7 @@
     "@types/codemirror": "0.0.96",
     "@types/jest": "26.0.0",
     "@types/markdown-it": "10.0.1",
+    "@types/markdown-it-container": "^2.0.3",
     "@types/node": "12.12.47",
     "@types/node-sass": "4.11.1",
     "@types/react": "16.9.38",
@@ -40,6 +41,7 @@
     "markdown-it": "11.0.0",
     "markdown-it-abbr": "^1.0.4",
     "markdown-it-deflist": "^2.0.3",
+    "markdown-it-container": "^3.0.0",
     "markdown-it-emoji": "1.4.0",
     "markdown-it-ins": "^3.0.0",
     "markdown-it-mark": "^3.0.0",

src/components/editor/markdown-preview/container-plugins/alert.ts

@@ -0,0 +1,15 @@
+import Renderer from 'markdown-it/lib/renderer'
+import Token from 'markdown-it/lib/token'
+
+type RenderContainerReturn = (tokens: Token[], index: number, options: any, env: any, self: Renderer) => void;
+type ValidAlertLevels = ('warning' | 'danger' | 'success' | 'info')
+export const validAlertLevels: ValidAlertLevels[] = ['success', 'danger', 'info', 'warning']
+
+export const createRenderContainer = (level: ValidAlertLevels): RenderContainerReturn => {
+  return (tokens: Token[], index: number, options: any, env: any, self: Renderer) => {
+    tokens[index].attrJoin('role', 'alert')
+    tokens[index].attrJoin('class', 'alert')
+    tokens[index].attrJoin('class', `alert-${level}`)
+    return self.renderToken(tokens, index, options)
+  }
+}

src/components/editor/markdown-preview/markdown-preview.scss

@@ -3,4 +3,8 @@
 .markdown-body {
   max-width: 758px;
   font-family: 'Source Sans Pro', "twemoji", sans-serif;
+
+  .alert > p, .alert > ul {
+    margin-bottom: 0;
+  }
 }

src/components/editor/markdown-preview/markdown-preview.tsx

@@ -1,15 +1,17 @@
 import MarkdownIt from 'markdown-it'
-import emoji from 'markdown-it-emoji'
-import markdownItRegex from 'markdown-it-regex'
-import taskList from 'markdown-it-task-lists'
 import abbreviation from 'markdown-it-abbr'
+import markdownItContainer from 'markdown-it-container'
 import definitionList from 'markdown-it-deflist'
-import subscript from 'markdown-it-sub'
-import superscript from 'markdown-it-sup'
+import emoji from 'markdown-it-emoji'
 import inserted from 'markdown-it-ins'
 import marked from 'markdown-it-mark'
+import markdownItRegex from 'markdown-it-regex'
+import subscript from 'markdown-it-sub'
+import superscript from 'markdown-it-sup'
+import taskList from 'markdown-it-task-lists'
 import React, { ReactElement, useMemo } from 'react'
 import ReactHtmlParser, { convertNodeToElement, Transform } from 'react-html-parser'
+import { createRenderContainer, validAlertLevels } from './container-plugins/alert'
 import { MarkdownItParserDebugger } from './markdown-it-plugins/parser-debugger'
 import './markdown-preview.scss'
 import { replaceGistLink } from './regex-plugins/replace-gist-link'
@@ -57,6 +59,11 @@ const MarkdownPreview: React.FC<MarkdownPreviewProps> = ({ content }) => {
     md.use(markdownItRegex, replaceVimeoLink)
     md.use(markdownItRegex, replaceGistLink)
     md.use(MarkdownItParserDebugger)
+
+    validAlertLevels.forEach(level => {
+      md.use(markdownItContainer, level, { render: createRenderContainer(level) })
+    })
+
     return md
   }, [])
 

yarn.lock

@@ -1587,7 +1587,14 @@
   resolved "https://registry.yarnpkg.com/@types/linkify-it/-/linkify-it-2.1.0.tgz#ea3dd64c4805597311790b61e872cbd1ed2cd806"
   integrity sha512-Q7DYAOi9O/+cLLhdaSvKdaumWyHbm7HAk/bFwwyTuU0arR5yyCeW5GOoqt4tJTpDRxhpx9Q8kQL6vMpuw9hDSw==
 
-"@types/markdown-it@10.0.1":
+"@types/markdown-it-container@^2.0.3":
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/@types/markdown-it-container/-/markdown-it-container-2.0.3.tgz#436de4c019d7d71b60f759037fd4d03611569eb8"
+  integrity sha512-ouJluaEGWV7clX7NVMRjkQfS/a11hFXDG1U04l8vrS1P2UgAFPlgMpk1rAPgK0MWU1NhcBYWVW7w/SpgePLs0A==
+  dependencies:
+    "@types/markdown-it" "*"
+
+"@types/markdown-it@*", "@types/markdown-it@10.0.1":
   version "10.0.1"
   resolved "https://registry.yarnpkg.com/@types/markdown-it/-/markdown-it-10.0.1.tgz#94e252ab689c8e9ceb9aff2946e0a458390105eb"
   integrity sha512-L1ibTdA5IUe/cRBlf3N3syAOBQSN1WCMGtAWir6mKxibiRl4LmpZM4jLz+7zAqiMnhQuAP1sqZOF9wXgn2kpEg==
@@ -7280,6 +7287,11 @@ markdown-it-deflist@^2.0.3:
   resolved "https://registry.yarnpkg.com/markdown-it-deflist/-/markdown-it-deflist-2.0.3.tgz#5727db04184d3cb2bc6ee4a9641e3a1091d5fd6f"
   integrity sha512-/BNZ8ksW42bflm1qQLnRI09oqU2847Z7MVavrR0MORyKLtiUYOMpwtlAfMSZAQU9UCvaUZMpgVAqoS3vpToJxw==
 
+markdown-it-container@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/markdown-it-container/-/markdown-it-container-3.0.0.tgz#1d19b06040a020f9a827577bb7dbf67aa5de9a5b"
+  integrity sha512-y6oKTq4BB9OQuY/KLfk/O3ysFhB3IMYoIWhGJEidXt1NQFocFK2sA2t0NYZAMyMShAGL6x5OPIbrmXPIqaN9rw==
+
 markdown-it-emoji@1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/markdown-it-emoji/-/markdown-it-emoji-1.4.0.tgz#9bee0e9a990a963ba96df6980c4fddb05dfb4dcc"