diff --git a/src/renderer/plugins.ts b/src/renderer/plugins.ts
index 4b9a9b2e..bafa7e94 100644
--- a/src/renderer/plugins.ts
+++ b/src/renderer/plugins.ts
@@ -20,6 +20,7 @@ import editorMarkdown from '@fe/plugins/editor-markdown'
 import editorMdSyntax from '@fe/plugins/editor-md-syntax'
 import editorWords from '@fe/plugins/editor-words'
 import editorEmoji from '@fe/plugins/editor-emoji'
+import editorPathCompletion from '@fe/plugins/editor-path-completion'
 import copyText from '@fe/plugins/copy-text'
 import switchTodo from '@fe/plugins/switch-todo'
 import imageViewer from '@fe/plugins/image-viewer'
@@ -75,6 +76,7 @@ export default [
   editorMdSyntax,
   editorEmoji,
   editorWords,
+  editorPathCompletion,
   copyText,
   switchTodo,
   imageViewer,
diff --git a/src/renderer/plugins/editor-path-completion.ts b/src/renderer/plugins/editor-path-completion.ts
new file mode 100644
index 00000000..6ac7cecb
--- /dev/null
+++ b/src/renderer/plugins/editor-path-completion.ts
@@ -0,0 +1,343 @@
+// https://github.com/microsoft/vscode/blob/main/extensions%2Fmarkdown-language-features%2Fsrc%2Ffeatures%2FpathCompletions.ts
+
+import type Markdown from 'markdown-it'
+import type * as Monaco from 'monaco-editor'
+import type { Ctx, Plugin } from '@fe/context'
+import type { Components } from '@fe/types'
+
+enum CompletionContextKind {
+  Link, // [...](|)
+
+  ReferenceLink, // [...][|]
+
+  LinkDefinition, // []: | // TODO: not implemented
+}
+
+interface AnchorContext {
+  /**
+   * Link text before the `#`.
+   *
+   * For `[text](xy#z|abc)` this is `xy`.
+   */
+  readonly beforeAnchor: string;
+  /**
+   * Text of the anchor before the current position.
+   *
+   * For `[text](xy#z|abc)` this is `z`.
+   */
+  readonly anchorPrefix: string;
+}
+
+interface CompletionContext {
+  readonly kind: CompletionContextKind;
+
+  /**
+   * Text of the link before the current position
+   *
+   * For `[text](xy#z|abc)` this is `xy#z`.
+   */
+  readonly linkPrefix: string;
+
+  /**
+   * Position of the start of the link.
+   *
+   * For `[text](xy#z|abc)` this is the position before `xy`.
+   */
+  readonly linkTextStartPosition: Monaco.Position;
+
+  /**
+   * Text of the link after the current position.
+   *
+   * For `[text](xy#z|abc)` this is `abc`.
+   */
+  readonly linkSuffix: string;
+
+  /**
+   * Info if the link looks like it is for an anchor: `[](#header)`
+   */
+  readonly anchorInfo?: AnchorContext;
+}
+
+class CompletionProvider implements Monaco.languages.CompletionItemProvider {
+  triggerCharacters = ['/', '#']
+
+  private readonly monaco: typeof Monaco
+  private readonly ctx: Ctx
+  private readonly markdown: Markdown
+
+  constructor (monaco: typeof Monaco, ctx: Ctx) {
+    this.monaco = monaco
+    this.ctx = ctx
+    // eslint-disable-next-line new-cap
+    this.markdown = new ctx.lib.markdownit()
+  }
+
+  public async provideCompletionItems (model: Monaco.editor.IModel, position: Monaco.Position): Promise<Monaco.languages.CompletionList | undefined> {
+    const context = this.getPathCompletionContext(model, position)
+    if (!context) {
+      return { suggestions: [] }
+    }
+
+    switch (context.kind) {
+      case CompletionContextKind.ReferenceLink: {
+        // TODO
+        return { suggestions: [] }
+      }
+
+      case CompletionContextKind.LinkDefinition:
+      case CompletionContextKind.Link: {
+        const items: Monaco.languages.CompletionItem[] = []
+
+        const isAnchorInCurrentDoc = context.anchorInfo && context.anchorInfo.beforeAnchor.length === 0
+
+        // Add anchor #links in current doc
+        if (context.linkPrefix.length === 0 || isAnchorInCurrentDoc) {
+          const insertRange = new this.monaco.Range(
+            context.linkTextStartPosition.lineNumber,
+            context.linkTextStartPosition.column,
+            position.lineNumber,
+            position.column
+          )
+
+          for await (const item of this.provideHeaderSuggestions(this.ctx.store.state.currentContent, context, position, insertRange)) {
+            items.push(item)
+          }
+        }
+
+        if (!isAnchorInCurrentDoc) {
+          if (context.anchorInfo) { // Anchor to a different document
+            const currentFile = this.ctx.store.state.currentFile
+            if (!currentFile || !context.anchorInfo.beforeAnchor.endsWith('.md')) {
+              return { suggestions: [] }
+            }
+
+            const filePath = this.ctx.utils.path.resolve(
+              this.ctx.utils.path.dirname(currentFile.path),
+              context.anchorInfo.beforeAnchor
+            )
+
+            const { content } = await this.ctx.api.readFile({ repo: currentFile.repo, path: filePath })
+            if (content) {
+              const anchorStartPosition = position.delta(0, -(context.anchorInfo.anchorPrefix.length + 1))
+              const range = new this.monaco.Range(
+                anchorStartPosition.lineNumber,
+                anchorStartPosition.column,
+                position.lineNumber,
+                position.column,
+              )
+
+              for await (const item of this.provideHeaderSuggestions(content, context, position, range)) {
+                items.push(item)
+              }
+            }
+          } else { // Normal path suggestions
+            for await (const item of this.providePathSuggestions(position, context)) {
+              items.push(item)
+            }
+          }
+        }
+
+        return { suggestions: items }
+      }
+    }
+  }
+
+  /// [...](...|
+  private readonly linkStartPattern = /\[([^\]]*?)\]\(\s*([^\s()]*)$/;
+
+  /// [...][...|
+  private readonly referenceLinkStartPattern = /\[([^\]]*?)\]\[\s*([^\s()]*)$/;
+
+  /// [id]: |
+  private readonly definitionPattern = /^\s*\[[\w-]+\]:\s*([^\s]*)$/m;
+
+  private getPathCompletionContext (model: Monaco.editor.IModel, position: Monaco.Position): CompletionContext | undefined {
+    const line = model.getLineContent(position.lineNumber)
+
+    const cursor = position.column - 1
+    const linePrefixText = line.slice(0, cursor)
+    const lineSuffixText = line.slice(cursor)
+
+    const linkPrefixMatch = linePrefixText.match(this.linkStartPattern)
+    if (linkPrefixMatch) {
+      const prefix = linkPrefixMatch[2]
+      if (this.refLooksLikeUrl(prefix)) {
+        return undefined
+      }
+
+      const suffix = lineSuffixText.match(/^[^)\s]*/)
+
+      return {
+        kind: CompletionContextKind.Link,
+        linkPrefix: prefix,
+        linkTextStartPosition: position.delta(0, -prefix.length),
+        linkSuffix: suffix ? suffix[0] : '',
+        anchorInfo: this.getAnchorContext(prefix),
+      }
+    }
+
+    const definitionLinkPrefixMatch = linePrefixText.match(this.definitionPattern)
+    if (definitionLinkPrefixMatch) {
+      const prefix = definitionLinkPrefixMatch[1]
+      if (this.refLooksLikeUrl(prefix)) {
+        return undefined
+      }
+
+      const suffix = lineSuffixText.match(/^[^\s]*/)
+      return {
+        kind: CompletionContextKind.LinkDefinition,
+        linkPrefix: prefix,
+        linkTextStartPosition: position.delta(0, -prefix.length),
+        linkSuffix: suffix ? suffix[0] : '',
+        anchorInfo: this.getAnchorContext(prefix),
+      }
+    }
+
+    const referenceLinkPrefixMatch = linePrefixText.match(this.referenceLinkStartPattern)
+    if (referenceLinkPrefixMatch) {
+      const prefix = referenceLinkPrefixMatch[2]
+      const suffix = lineSuffixText.match(/^[^\]\s]*/)
+      return {
+        kind: CompletionContextKind.ReferenceLink,
+        linkPrefix: prefix,
+        linkTextStartPosition: position.delta(0, -prefix.length),
+        linkSuffix: suffix ? suffix[0] : '',
+      }
+    }
+
+    return undefined
+  }
+
+  /**
+   * Check if {@param ref} looks like a 'http:' style url.
+   */
+  private refLooksLikeUrl (prefix: string): boolean {
+    return /^\s*[\w\d-]+:/.test(prefix)
+  }
+
+  private getAnchorContext (prefix: string): AnchorContext | undefined {
+    const anchorMatch = prefix.match(/^(.*)#([\w\d-]*)$/)
+    if (!anchorMatch) {
+      return undefined
+    }
+    return {
+      beforeAnchor: anchorMatch[1],
+      anchorPrefix: anchorMatch[2],
+    }
+  }
+
+  private async * providePathSuggestions (position: Monaco.Position, context: CompletionContext): AsyncIterable<Monaco.languages.CompletionItem> {
+    const valueBeforeLastSlash = context.linkPrefix.substring(0, context.linkPrefix.lastIndexOf('/') + 1) || '.' // keep the last slash
+
+    const currentFile = this.ctx.store.state.currentFile
+    if (!currentFile) {
+      return
+    }
+
+    const parentDir = this.ctx.utils.path.resolve(
+      this.ctx.utils.path.dirname(currentFile.path),
+      valueBeforeLastSlash
+    )
+
+    const pathSegmentStart = position.delta(0, valueBeforeLastSlash.length - context.linkPrefix.length)
+    const insertRange = new this.monaco.Range(
+      pathSegmentStart.lineNumber,
+      pathSegmentStart.column,
+      position.lineNumber,
+      position.column
+    )
+
+    const pathSegmentEnd = position.delta(0, context.linkSuffix.length)
+    const replacementRange = new this.monaco.Range(
+      pathSegmentStart.lineNumber,
+      pathSegmentStart.column,
+      pathSegmentEnd.lineNumber,
+      pathSegmentEnd.column,
+    )
+
+    const items = this.getFileList(parentDir)
+
+    let i = 0
+    for (const item of items) {
+      i++
+      const isDir = item.type === 'dir'
+      const label = isDir ? item.name + '/' : item.name
+      yield {
+        label: label,
+        insertText: this.ctx.utils.encodeMarkdownLink(label),
+        kind: isDir ? this.monaco.languages.CompletionItemKind.Folder : this.monaco.languages.CompletionItemKind.File,
+        range: {
+          insert: insertRange,
+          replace: replacementRange,
+        },
+        command: isDir ? { id: 'editor.action.triggerSuggest', title: '' } : undefined,
+        sortText: i.toString().padStart(7),
+      }
+    }
+  }
+
+  private getFileList (parentDir: string): Components.Tree.Node[] {
+    const result: Components.Tree.Node[] = []
+
+    const traverseTree = (nodes: Components.Tree.Node[]) => {
+      nodes.forEach(node => {
+        if (node.type === 'dir') {
+          if (parentDir.startsWith(node.path)) {
+            traverseTree(node.children || [])
+
+            if (node.path === parentDir) {
+              result.push(...(node.children || []))
+            }
+          }
+        }
+      })
+    }
+
+    traverseTree(this.ctx.store.state.tree || [])
+
+    return result
+  }
+
+  private async * provideHeaderSuggestions (mdContent: string, context: CompletionContext, position: Monaco.Position, insertionRange: Monaco.Range): AsyncIterable<Monaco.languages.CompletionItem> {
+    const tokens = this.markdown.parse(mdContent, [])
+    const endPos = position.delta(0, context.linkSuffix.length)
+    const replacementRange = new this.monaco.Range(
+      insertionRange.startLineNumber,
+      insertionRange.startColumn,
+      endPos.lineNumber,
+      endPos.column
+    )
+
+    for (let i = 0; i < tokens.length; i++) {
+      const token = tokens[i]
+      if (token.type === 'heading_open') {
+        const nextToken = tokens[i + 1]
+        if (nextToken && nextToken.content) {
+          const id = nextToken.content.trim().toLowerCase().replace(/\s+/g, '-')
+          yield {
+            kind: this.monaco.languages.CompletionItemKind.Reference,
+            label: '# ' + tokens[i].tag.toUpperCase() + ' ' + nextToken.content,
+            insertText: '#' + this.ctx.utils.encodeMarkdownLink(id),
+            range: {
+              insert: insertionRange,
+              replace: replacementRange,
+            },
+            sortText: i.toString().padStart(7)
+          }
+        }
+      }
+    }
+  }
+}
+
+export default {
+  name: 'editor-md-syntax',
+  register: (ctx) => {
+    ctx.editor.whenEditorReady().then(({ monaco }) => {
+      monaco.languages.registerCompletionItemProvider(
+        'markdown',
+        new CompletionProvider(monaco, ctx)
+      )
+    })
+  }
+} as Plugin
diff --git a/src/renderer/support/store.ts b/src/renderer/support/store.ts
index c73f666a..c655e0a3 100644
--- a/src/renderer/support/store.ts
+++ b/src/renderer/support/store.ts
@@ -4,7 +4,7 @@ import * as storage from '@fe/utils/storage'
 import type { Components, Doc, Repo } from '@fe/types'
 
 export const initState = {
-  tree: null,
+  tree: null as Components.Tree.Node[] | null,
   wordWrap: storage.get<'off' | 'on'>('wordWrap', 'off'),
   typewriterMode: storage.get<boolean>('typewriterMode', false),
   showSide: storage.get('showSide', true),