Switch from gitbook to mdbook

.github/workflows/deploy.yml

@@ -0,0 +1,43 @@
+name: Deploy to GitHub Pages
+
+on:
+  # Triggers the workflow on push or pull request events but
+  # only for the default branch.
+  push:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/deploy.yml'
+      - 'book.toml'
+      - 'guide/**'
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  fetch:
+    runs-on: ubuntu-latest
+    env:
+      MDBOOK_VERSION: v0.4.36
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+      - name: Install mdbook
+        run: |
+          mkdir installed-bins
+          curl -Lf "https://github.com/rust-lang/mdBook/releases/download/$MDBOOK_VERSION/mdbook-$MDBOOK_VERSION-x86_64-unknown-linux-gnu.tar.gz" | tar -xz --directory=./installed-bins
+          echo `pwd`/installed-bins >> $GITHUB_PATH
+      - name: Install gh-pages
+        run: |
+          npm install gh-pages@"~6.1.1"
+      - name: Build book
+        run: |
+            mdbook --version
+            mdbook build
+      - name: Set Git config
+        run: |
+          git config --global user.email "actions@users.noreply.github.com"
+          git config --global user.name 'Automation'
+          git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/$GITHUB_REPOSITORY
+      - name: Deploy to GitHub pages
+        run: |
+          npx gh-pages --message "Deploy docs" --no-history --dist build

.github/workflows/test.yml

@@ -3,9 +3,11 @@ name: Run tests
 on:
   # Triggers the workflow on push or pull request events but only for the master branch
   push:
-    branches: [ master ]
+    branches:
+      - master
   pull_request:
-    branches: [ master ]
+    branches:
+      - master
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
@@ -14,8 +16,8 @@ jobs:
     name: Run tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
           node-version: '12'
       - name: Run ci

book.toml

@@ -0,0 +1,13 @@
+[book]
+multilingual = false
+src = "guide"
+
+[build]
+build-dir = "build"
+create-missing = false
+
+[output.html]
+additional-css = ["guide/css/custom.css"]
+edit-url-template = "https://github.com/projectfluent/fluent/edit/master/{path}"
+git-repository-url = "https://github.com/projectfluent/fluent/"
+no-section-label = true

guide/SUMMARY.md

@@ -1,5 +1,6 @@
 # Summary
 
+* [Introduction](README.md)
 * [Hello, world!](hello.md)
 * [Writing Text](text.md)
     * [Placeables](placeables.md)

guide/css/custom.css

@@ -0,0 +1,7 @@
+body {
+    font-size: 1.8rem;
+}
+
+.chapter li.chapter-item {
+    line-height: 1.8em;
+}

package.json

@@ -5,11 +5,10 @@
     "private": true,
     "scripts": {
         "bench": "node -r esm ./test/bench.js ./test/benchmarks/gecko_strings.ftl",
-        "build:guide": "gitbook build guide build/guide",
+        "build:guide": "mdbook build",
         "build": "npm run --silent build:guide",
         "ci": "npm run --silent lint && npm test && npm run --silent test:ebnf && npm run --silent test:validate",
         "clean": "rm -rf build",
-        "deploy": "gh-pages -d build",
         "generate:ebnf": "node -r esm bin/ebnf.js ./syntax/grammar.js > ./spec/fluent.ebnf",
         "generate:fixtures": "make -sC test/fixtures",
         "generate": "npm run --silent generate:ebnf && npm run --silent generate:fixtures",
@@ -40,8 +39,6 @@
         "eslint": "^6.7.2",
         "@fluent/bundle": "^0.14.0",
         "@fluent/syntax": "^0.14.0",
-        "gh-pages": "^2.1.1",
-        "gitbook-cli": "^2.3.2",
         "json-diff": "^0.5.4"
     },
     "dependencies": {