feat: set toc name from title

docs/docs/table-of-contents.md

@@ -10,19 +10,15 @@ To add a TOC, create a file named `toc.yml`. Here's the structure for a simple Y
 items:
 - name: Tutorial
   items:
-  - name: Introduction
-    href: tutorial.md
-  - name: Step 1
-    href: step-1.md
-  - name: Step 2
-    href: step-2.md
-  - name: Step 3
-    href: step-3.md
+  - href: tutorial.md
+  - href: step-1.md
+  - href: step-2.md
+  - href: step-3.md
 ```
 
 The YAML document is a tree of TOC nodes, each of which has these properties: 
 
-- `name`: The display name for the TOC node.
+- `name`: An optional display name for the TOC node. When not specified, uses the `title` metadata or the first Heading 1 element from the referenced article as the display name.
 - `href`: The path the TOC node leads to. Optional because a node can exist just to parent other nodes.
 - `items`: If a node has children, they're listed in the items array.
 - `uid`: The uid of the article. Can be used instead of `href`.

samples/seed/articles/toc.yml

@@ -1,17 +1,13 @@
 pdfFileName: seed.pdf
 pdfCoverPage: pdf/cover.html
 items:
-- name: Getting Started
-  href: docfx_getting_started.md
+- href: docfx_getting_started.md
 - name: Engineering Docs
   expanded: true
   items:
   - name: Section 1
-  - name: Engineering Guidelines
-    href: engineering_guidelines.md
-  - name: CSharp Coding Standards
-    href: csharp_coding_standards.md
-- name: Markdown
-  href: markdown.md
+  - href: engineering_guidelines.md
+  - href: csharp_coding_standards.md
+- href: markdown.md
 - name: Microsoft Docs
   href: https://docs.microsoft.com/en-us/

src/Docfx.Build/ManifestProcessor.cs

@@ -4,6 +4,7 @@
 using System.Collections.Concurrent;
 
 using Docfx.Common;
+using Docfx.DataContracts.Common;
 using Docfx.Plugins;
 
 namespace Docfx.Build.Engine;
@@ -33,6 +34,8 @@ public ManifestProcessor(List<ManifestItemWithContext> manifestWithContext, Docu
 
     public void Process()
     {
+        UpdateTocName();
+
         UpdateContext();
 
         // Afterwards, m.Item.Model.Content is always IDictionary
@@ -53,8 +56,6 @@ public void Process()
         }
     }
 
-    #region Private
-
     private void UpdateContext()
     {
         _context.ResolveExternalXRefSpec();
@@ -181,5 +182,49 @@ private List<ManifestItem> ProcessTemplate()
         return _templateProcessor.Process(_manifestWithContext.Select(s => s.Item).ToList(), _context.ApplyTemplateSettings, _globalMetadata);
     }
 
-    #endregion
+    private void UpdateTocName()
+    {
+        var titles = (
+            from item in _manifestWithContext
+            let title = GetTitle(item)
+            where !string.IsNullOrEmpty(title)
+            group title
+            by item.FileModel.Key).ToDictionary(g => g.Key, g => g.First());
+
+        foreach (var item in _manifestWithContext)
+        {
+            if (item.FileModel.Content is not TocItemViewModel toc)
+                continue;
+
+            UpdateTocNameCore(toc.Items);
+        }
+
+        void UpdateTocNameCore(List<TocItemViewModel> items)
+        {
+            if (items is null)
+                return;
+
+            foreach (var node in items)
+            {
+                if (string.IsNullOrEmpty(node.Name))
+                {
+                    if (node.Href is not null && titles.TryGetValue(UriUtility.GetPath(node.Href), out var title))
+                        node.Name = title;
+                    else
+                        Logger.LogWarning(
+                            $"TOC item ({node}) with empty name found. Missing a name?",
+                            code: WarningCodes.Build.EmptyTocItemName);
+                }
+
+                UpdateTocNameCore(node.Items);
+            }
+        }
+
+        string GetTitle(ManifestItemWithContext item)
+        {
+            return item.FileModel.Content is Dictionary<string, object> dict &&
+                dict.TryGetValue("title", out var title) &&
+                title is string result ? result : null;
+        }
+    }
 }

src/Docfx.Build/TableOfContents/TocResolver.cs

@@ -83,14 +83,6 @@ private TocItemInfo ResolveItemCore(TocItemInfo wrapper, Stack<FileAndType> stac
         // validate href
         ValidateHref(item);
 
-        // validate if name is missing
-        if (!isRoot && string.IsNullOrEmpty(item.Name) && string.IsNullOrEmpty(item.TopicUid))
-        {
-            Logger.LogWarning(
-                $"TOC item ({item}) with empty name found. Missing a name?",
-                code: WarningCodes.Build.EmptyTocItemName);
-        }
-
         // TocHref supports 2 forms: absolute path and local toc file.
         // When TocHref is set, using TocHref as Href in output, and using Href as Homepage in output
         var tocHrefType = Utility.GetHrefType(item.TocHref);

templates/modern/src/helper.ts

@@ -33,7 +33,10 @@ export function loc(id: string, args?: { [key: string]: string }): string {
 /**
  * Add <wbr> into long word.
  */
-export function breakWord(text: string): string[] {
+export function breakWord(text?: string): string[] {
+  if (!text) {
+    return []
+  }
   const regex = /([a-z0-9])([A-Z]+[a-z])|([a-zA-Z0-9][.,/<>_])/g
   const result = []
   let start = 0
@@ -55,7 +58,7 @@ export function breakWord(text: string): string[] {
 /**
  * Add <wbr> into long word.
  */
-export function breakWordLit(text: string): TemplateResult {
+export function breakWordLit(text?: string): TemplateResult {
   const result = []
   breakWord(text).forEach(word => {
     if (result.length > 0) {

templates/modern/src/toc.ts

@@ -6,7 +6,7 @@ import { classMap } from 'lit-html/directives/class-map.js'
 import { breakWordLit, meta, isExternalHref, loc, isSameURL } from './helper'
 
 export type TocNode = {
-  name: string
+  name?: string
   href?: string
   expanded?: boolean
   items?: TocNode[]

test/docfx.Snapshot.Tests/SamplesTest.Seed.Linux/articles/seed.pdf.verified.json

@@ -8,7 +8,7 @@
     },
     {
       "Number": 2,
-      "Text": "Table of ContentsGetting Started3Engineering DocsSection 1Engineering Guidelines5CSharp Coding Standards8Markdown15Microsoft Docs",
+      "Text": "Table of ContentsGetting Started with docfx3Engineering DocsSection 1Engineering Guidelines5C# Coding Standards8Markdown15Microsoft Docs",
       "Links": [
         {
           "Uri": "https://docs.microsoft.com/en-us/"
@@ -278,7 +278,7 @@
   ],
   "Bookmarks": [
     {
-      "Title": "Getting Started",
+      "Title": "Getting Started with docfx",
       "Children": [],
       "Destination": {
         "PageNumber": 3,
@@ -314,7 +314,7 @@
           }
         },
         {
-          "Title": "CSharp Coding Standards",
+          "Title": "C# Coding Standards",
           "Children": [],
           "Destination": {
             "PageNumber": 8,

test/docfx.Snapshot.Tests/SamplesTest.Seed.Linux/articles/toc.html.view.verified.json

@@ -2,7 +2,7 @@
   "order": 100.0,
   "items": [
     {
-      "name": "Getting Started",
+      "name": "Getting Started with docfx",
       "href": "docfx_getting_started.html",
       "topicHref": "docfx_getting_started.html",
       "tocHref": null,
@@ -31,7 +31,7 @@
           "leaf": true
         },
         {
-          "name": "CSharp Coding Standards",
+          "name": "C# Coding Standards",
           "href": "csharp_coding_standards.html",
           "topicHref": "csharp_coding_standards.html",
           "tocHref": null,

test/docfx.Snapshot.Tests/SamplesTest.Seed.Linux/articles/toc.json.view.verified.json

@@ -1,3 +1,3 @@
 {
-  "content": "{\"order\":100,\"items\":[{\"name\":\"Getting Started\",\"href\":\"docfx_getting_started.html\",\"topicHref\":\"docfx_getting_started.html\"},{\"name\":\"Engineering Docs\",\"items\":[{\"name\":\"Section 1\"},{\"name\":\"Engineering Guidelines\",\"href\":\"engineering_guidelines.html\",\"topicHref\":\"engineering_guidelines.html\"},{\"name\":\"CSharp Coding Standards\",\"href\":\"csharp_coding_standards.html\",\"topicHref\":\"csharp_coding_standards.html\"}],\"expanded\":true},{\"name\":\"Markdown\",\"href\":\"markdown.html\",\"topicHref\":\"markdown.html\"},{\"name\":\"Microsoft Docs\",\"href\":\"https://docs.microsoft.com/en-us/\",\"topicHref\":\"https://docs.microsoft.com/en-us/\"}],\"pdfFileName\":\"seed.pdf\",\"pdfCoverPage\":\"pdf/cover.html\",\"pdf\":true,\"pdfTocPage\":true}"
+  "content": "{\"order\":100,\"items\":[{\"name\":\"Getting Started with docfx\",\"href\":\"docfx_getting_started.html\",\"topicHref\":\"docfx_getting_started.html\"},{\"name\":\"Engineering Docs\",\"items\":[{\"name\":\"Section 1\"},{\"name\":\"Engineering Guidelines\",\"href\":\"engineering_guidelines.html\",\"topicHref\":\"engineering_guidelines.html\"},{\"name\":\"C# Coding Standards\",\"href\":\"csharp_coding_standards.html\",\"topicHref\":\"csharp_coding_standards.html\"}],\"expanded\":true},{\"name\":\"Markdown\",\"href\":\"markdown.html\",\"topicHref\":\"markdown.html\"},{\"name\":\"Microsoft Docs\",\"href\":\"https://docs.microsoft.com/en-us/\",\"topicHref\":\"https://docs.microsoft.com/en-us/\"}],\"pdfFileName\":\"seed.pdf\",\"pdfCoverPage\":\"pdf/cover.html\",\"pdf\":true,\"pdfTocPage\":true}"
 }

test/docfx.Snapshot.Tests/SamplesTest.Seed.Linux/articles/toc.verified.json

@@ -2,7 +2,7 @@
   "order": 100,
   "items": [
     {
-      "name": "Getting Started",
+      "name": "Getting Started with docfx",
       "href": "docfx_getting_started.html",
       "topicHref": "docfx_getting_started.html"
     },
@@ -18,7 +18,7 @@
           "topicHref": "engineering_guidelines.html"
         },
         {
-          "name": "CSharp Coding Standards",
+          "name": "C# Coding Standards",
           "href": "csharp_coding_standards.html",
           "topicHref": "csharp_coding_standards.html"
         }

test/docfx.Snapshot.Tests/SamplesTest.Seed.Linux/pdf/toc.html.view.verified.json

@@ -6,7 +6,7 @@
       "includedFrom": "~/articles/toc.yml",
       "items": [
         {
-          "name": "Getting Started",
+          "name": "Getting Started with docfx",
           "href": "../articles/docfx_getting_started.html",
           "topicHref": "../articles/docfx_getting_started.html",
           "tocHref": null,
@@ -35,7 +35,7 @@
               "leaf": true
             },
             {
-              "name": "CSharp Coding Standards",
+              "name": "C# Coding Standards",
               "href": "../articles/csharp_coding_standards.html",
               "topicHref": "../articles/csharp_coding_standards.html",
               "tocHref": null,