Extract clean title from first heading (#616)

* removed first-header-extractor
get first heading from markdown rende
* don't remove editor or renderer just hide them
this way both are always up to date and can be shown very fast
* extracted image alt attribute into first title. too
* added tests as suggested by @mrdrogdrog

cypress/integration/documentTitle.spec.ts

@@ -63,5 +63,23 @@ describe('Document Title', () => {
         .type(`# ${title} [link](https://codimd.org)`)
       cy.title().should('eq', `${title} link - HedgeDoc @ ${branding.name}`)
     })
+
+    it('markdown syntax removed first', () => {
+      cy.get('.CodeMirror textarea')
+        .type(`# ${title} 1*2*3 4*5**`)
+      cy.title().should('eq', `${title} 123 4*5** - HedgeDoc @ ${branding.name}`)
+    })
+
+    it('markdown syntax removed second', () => {
+      cy.get('.CodeMirror textarea')
+        .type(`# ${title} **1 2*`)
+      cy.title().should('eq', `${title} *1 2 - HedgeDoc @ ${branding.name}`)
+    })
+
+    it('markdown syntax removed third', () => {
+      cy.get('.CodeMirror textarea')
+      .type(`# ${title} _asd_`)
+      cy.title().should('eq', `${title} asd - HedgeDoc @ ${branding.name}`)
+    })
   })
 })

src/components/editor/editor.tsx

@@ -54,7 +54,7 @@ export const Editor: React.FC = () => {
     } else if (noteMetadata.current?.opengraph && noteMetadata.current?.opengraph.get('title') && noteMetadata.current?.opengraph.get('title') !== '') {
       setDocumentTitle(noteMetadata.current.opengraph.get('title') ?? untitledNote)
     } else {
-      setDocumentTitle(firstHeading.current ?? untitledNote)
+      setDocumentTitle((firstHeading.current ?? untitledNote).trim())
     }
   }, [untitledNote])
 

src/components/editor/splitter/splitter.tsx

@@ -43,21 +43,17 @@ export const Splitter: React.FC<SplitterProps> = ({ containerClassName, left, ri
         }
       }}
     >
-      <ShowIf condition={showLeft}>
-        <div className={'splitter left'} style={{ flexBasis: `calc(${realSplit}% - 5px)` }}>
-          {left}
-        </div>
-      </ShowIf>
+      <div className={`splitter left ${!showLeft ? 'd-none' : ''}`} style={{ flexBasis: `calc(${realSplit}% - 5px)` }}>
+        {left}
+      </div>
       <ShowIf condition={showLeft && showRight}>
         <div className='splitter separator'>
           <SplitDivider onGrab={() => setDoResizing(true)}/>
         </div>
       </ShowIf>
-      <ShowIf condition={showRight}>
-        <div className={'splitter right'}>
-          {right}
-        </div>
-      </ShowIf>
+      <div className={`splitter right ${!showRight ? 'd-none' : ''}`}>
+        {right}
+      </div>
     </div>
   )
 }

src/components/markdown-renderer/full-markdown-renderer.tsx

@@ -8,7 +8,7 @@ import mathJax from 'markdown-it-mathjax'
 import plantuml from 'markdown-it-plantuml'
 import markdownItRegex from 'markdown-it-regex'
 import toc from 'markdown-it-toc-done-right'
-import React, { useCallback, useMemo, useRef, useState } from 'react'
+import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import { Alert } from 'react-bootstrap'
 import { Trans } from 'react-i18next'
 import { useSelector } from 'react-redux'
@@ -20,7 +20,6 @@ import { slugify } from '../editor/table-of-contents/table-of-contents'
 import { RawYAMLMetadata, YAMLMetaData } from '../editor/yaml-metadata/yaml-metadata'
 import { BasicMarkdownRenderer } from './basic-markdown-renderer'
 import { createRenderContainer, validAlertLevels } from './markdown-it-plugins/alert-container'
-import { firstHeaderExtractor } from './markdown-it-plugins/first-header-extractor'
 import { highlightedCode } from './markdown-it-plugins/highlighted-code'
 import { LineMarkers, lineNumberMarker } from './markdown-it-plugins/line-number-marker'
 import { plantumlError } from './markdown-it-plugins/plantuml-error'
@@ -119,15 +118,28 @@ export const FullMarkdownRenderer: React.FC<FullMarkdownRendererProps & Addition
   const tocAst = useRef<TocAst>()
   usePostTocAstOnChange(tocAst, onTocChange)
 
-  const configureMarkdownIt = useCallback((md: MarkdownIt): void => {
-    if (onFirstHeadingChange) {
-      md.use(firstHeaderExtractor(), {
-        firstHeaderFound: (firstHeader: string | undefined) => {
-          firstHeadingRef.current = firstHeader
-        }
-      })
+  const extractInnerText = useCallback((node: ChildNode) => {
+    let innerText = ''
+    if (node.childNodes && node.childNodes.length > 0) {
+      node.childNodes.forEach((child) => { innerText += extractInnerText(child) })
+    } else if (node.nodeName === 'IMG') {
+      innerText += (node as HTMLImageElement).getAttribute('alt')
+    } else {
+      innerText += node.textContent
     }
+    return innerText
+  }, [])
 
+  useEffect(() => {
+    if (onFirstHeadingChange && documentElement.current) {
+      const firstHeading = documentElement.current.getElementsByTagName('h1').item(0)
+      if (firstHeading) {
+        onFirstHeadingChange(extractInnerText(firstHeading))
+      }
+    }
+  }, [content, extractInnerText, onFirstHeadingChange])
+
+  const configureMarkdownIt = useCallback((md: MarkdownIt): void => {
     if (onMetaDataChange) {
       md.use(frontmatter, (rawMeta: string) => {
         try {
@@ -210,7 +222,7 @@ export const FullMarkdownRenderer: React.FC<FullMarkdownRendererProps & Addition
         currentLineMarkers.current = lineMarkers
       }
     })
-  }, [onFirstHeadingChange, onMetaDataChange, plantumlServer])
+  }, [onMetaDataChange, plantumlServer])
 
   const clearMetadata = useCallback(() => {
     rawMetaRef.current = undefined

src/components/markdown-renderer/markdown-it-plugins/first-header-extractor.ts

@@ -1,26 +0,0 @@
-import MarkdownIt from 'markdown-it/lib'
-
-export interface FirstHeaderExtractorOptions {
-  firstHeaderFound: (firstHeader: string|undefined) => void
-}
-
-export const firstHeaderExtractor: () => MarkdownIt.PluginWithOptions<FirstHeaderExtractorOptions> = () => {
-  return (md, options) => {
-    if (!options?.firstHeaderFound) {
-      return
-    }
-    md.core.ruler.after('normalize', 'extract first L1 heading', (state) => {
-      const lines = state.src.split('\n')
-      const linkAltTextRegex = /!?\[([^\]]*)]\([^)]*\)/
-      for (const line of lines) {
-        if (line.startsWith('# ')) {
-          const headerLine = line.replace('# ', '').replace(linkAltTextRegex, '$1')
-          options.firstHeaderFound(headerLine)
-          return true
-        }
-      }
-      options.firstHeaderFound(undefined)
-      return true
-    })
-  }
-}