Preparations for LDML 48 release (#1096)

* Use normal spaces for PDI name

* Update Acknowledgments section, fixing trailing whitespaces

* Define _numeric operand_ as a term

* Make section names unique

* Add header & footer from unicode-org/cldr@5565730

Here, specifically:
https://github.com/unicode-org/cldr/blob/556573054c05e2c352229ac0ec93e7b3d3960432/docs/ldml/tr35-messageFormat.md

* Add publication script & instructions

* Drop docs/checklist-for-pourover-creation.md

* Drop version specifier from semantic skeletons link

* git submodule add -b main git@github.com:unicode-org/cldr.git publish/cldr

* Rewrite publish scripts in Node.js, use tr-archive tool

* ci: Add GitHub Pages deployment script

* ci: Add paths filter

* ci: Add build_spec action

Author: eemeli

.github/workflows/build_spec.yml

@@ -0,0 +1,18 @@
+name: Build spec as HTML
+
+on:
+  pull_request:
+    paths:
+      - 'publish/**'
+      - 'spec/**'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - run: make dist/index.html
+        working-directory: ./publish

.github/workflows/deploy_pages.yml

@@ -0,0 +1,37 @@
+name: Deploy spec to GitHub Pages
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'publish/**'
+      - 'spec/**'
+  workflow_dispatch:
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - uses: actions/configure-pages@v5
+      - run: make
+        working-directory: ./publish
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: publish/dist/
+      - uses: actions/deploy-pages@v4
+        id: deployment

.gitmodules

@@ -0,0 +1,4 @@
+[submodule "publish/cldr"]
+	path = publish/cldr
+	url = git@github.com:unicode-org/cldr.git
+	branch = main

docs/checklist-for-pourover-creation.md

@@ -0,0 +1,4 @@
+/dist/
+/gtag.html
+/header.html
+/reports-v2.css

publish/.gitignore

@@ -0,0 +1,49 @@
+ldml = cldr/docs/ldml
+mf-target = $(ldml)/tr35-messageFormat.md
+tr-archive = cldr/tools/scripts/tr-archive
+
+all: dist
+.PHONY: prepare dist clean
+prepare: cldr/.git $(tr-archive)/node_modules/.package-lock.json header.md
+dist: dist/index.html dist/css/reports-v2.css dist/css/tr35.css dist/js/anchor.min.js dist/js/tr35search.js
+clean:
+	rm -r dist gtag.html header.html
+	cd cldr && git restore .
+
+dist/index.html: $(mf-target) fix-archive.mjs gtag.html header.html
+	@mkdir -p dist
+	cp $(mf-target) ./dist/index.md
+	node $(tr-archive)/archive.js
+	node fix-archive.mjs
+	rm ./dist/index.md
+
+$(mf-target): cldr/.git $(tr-archive)/node_modules/.package-lock.json collect.mjs check-toc.mjs $(shell find ../spec -type f) | header.md
+	node collect.mjs > $(mf-target)
+	cd $(tr-archive) && node fix-tocs.js
+	node check-toc.mjs < $(mf-target)
+
+cldr/.git:
+	git submodule update --init --remote --rebase cldr
+$(tr-archive)/node_modules/.package-lock.json: $(tr-archive)/package-lock.json
+	cd $(tr-archive) && npm ci
+
+header.md: update-header-footer.mjs
+	node update-header-footer.mjs < $(mf-target)
+
+dist/css/reports-v2.css:
+	@mkdir -p dist/css
+	cd dist/css && curl -O 'https://www.unicode.org/reports/reports-v2.css'
+dist/css/tr35.css: $(tr-archive)/assets/css/tr35.css
+	@mkdir -p dist/css
+	cp $< $@
+dist/js/anchor.min.js: $(tr-archive)/node_modules/.package-lock.json $(tr-archive)/node_modules/anchor-js/anchor.min.js
+	@mkdir -p dist/js
+	cp $< $@
+dist/js/tr35search.js: $(tr-archive)/assets/js/tr35search.js
+	@mkdir -p dist/js
+	cp $< $@
+
+gtag.html: $(tr-archive)/gtag.html
+	ln -s $<
+header.html: $(tr-archive)/header.html
+	ln -s $<

publish/Makefile

@@ -0,0 +1,26 @@
+# Tools for publication
+
+The contents of [Unicode MessageFormat Standard](./spec/) are published
+as a part of [Unicode Technical Standard #35](https://unicode.org/reports/tr35/).
+
+The contents of this directory are used to collect the spec parts into a single file for publication,
+and to fix internal and external links.
+
+The scripts require Node.js 20 or later, and expect to be run in a POSIX environment.
+
+To build a spec update:
+
+1. Use `make prepare` to:
+   1. Update the CLDR submodule
+   1. Install `tr-archive` tool dependencies
+   1. Update `header.md` and `footer.md`
+1. Apply any updates needed in `header.md`.
+1. Update `collect.mjs` as required for any structural changes or new links.
+1. Use `make dist` to:
+   1. Collect the current spec parts into `cldr/docs/ldml/tr35-messageFormat.md`.
+   1. Fix link targets.
+   1. Add the Table of Contents.
+   1. Check the Table of Contents for duplicate section title links.
+   1. Build a local copy of the rendered HTML at `dist/index.html`.
+1. Inspect the results; `git diff` in the `cldr/` submodule may be useful.
+1. Apply fixes and repeat as necessary until the output is clean.

publish/README.md

@@ -0,0 +1,33 @@
+#!/usr/bin/env node
+
+import { readFileSync } from "node:fs";
+import { exit } from "node:process";
+
+const lines = readFileSync(0, "utf8").split("\n"); // 0: stdin
+
+let i = lines.findIndex((line) => line.startsWith('## <a name="Contents"'));
+if (i < 0) throw new Error("ToC start not found");
+while (lines[++i] === "");
+
+/** @type {Record<string, string[]>} */
+const links = {};
+let match;
+while ((match = /\(#(.+?)\)$/.exec(lines[i]))) {
+  const target = match[1];
+  if (target in links) links[target].push(i);
+  else links[target] = [i];
+  ++i;
+}
+
+const n = Object.keys(links).length;
+if (n < 20) throw new Error(`ToC too small: ${n} entries`);
+
+let ok = true;
+for (const a of Object.values(links)) {
+  if (a.length > 1) {
+    if (ok) console.error("Duplicate ToC links:");
+    for (const i of a) console.error(`\tline ${i + 1}: ${lines[i]}`);
+    ok = false;
+  }
+}
+exit(ok ? 0 : 1);

publish/check-toc.mjs

@@ -0,0 +1,63 @@
+#!/usr/bin/env node
+
+import { readFileSync } from "node:fs";
+
+// order matters here
+const parts = {
+  header: "header.md",
+  intro: "../spec/intro.md",
+  syntax: "../spec/syntax.md",
+  abnf: "../spec/message.abnf",
+  formatting: "../spec/formatting.md",
+  errors: "../spec/errors.md",
+  functions: "../spec/functions/README.md",
+  stringFunctions: "../spec/functions/string.md",
+  numberFunctions: "../spec/functions/number.md",
+  datetimeFunctions: "../spec/functions/datetime.md",
+  uNamespace: "../spec/u-namespace.md",
+  datamodel: "../spec/data-model/README.md",
+  json: "../spec/data-model/message.json",
+  appendices: "../spec/appendices.md",
+  footer: "footer.md",
+};
+
+for (const [name, path] of Object.entries(parts)) {
+  parts[name] = readFileSync(path, "utf8").trim();
+}
+
+parts.abnf = "## message.abnf\n\n```abnf\n" + parts.abnf + "\n```";
+parts.json = "## message.json\n\n```json\n" + parts.json + "\n```";
+
+// Strip title + table of contents
+const introStart = parts.intro.indexOf("## Introduction");
+if (introStart < 0) throw new Error("Intro start not found");
+parts.intro = parts.intro.substring(introStart);
+
+parts.functions = parts.functions.replace(
+  /^#+ Table of Contents\n\n(.*?)\n\n/ms,
+  ""
+);
+
+const result = Object.values(parts)
+  .join("\n\n")
+  .replace(/ +$/g, "")
+  .replace(/\n{3,}/g, "\n\n")
+  .replace(/\[(.+?)\]\((.+?)\)/g, fixLink);
+console.log(result);
+
+/**
+ * @param {string} link
+ * @param {string} label
+ * @param {string} target
+ */
+function fixLink(link, label, target) {
+  if (target === "../docs/why_mf_next.md") return label;
+  if (target.endsWith("message.abnf")) return `[${label}](#messageabnf)`;
+  if (target.endsWith("message.abnf")) return `[${label}](#messageabnf)`;
+  if (target.endsWith("syntax.md")) return `[${label}](#syntax)`;
+  const local = /^(?:\.\/)?[\w./]+\.md(#.+)/.exec(target);
+  if (local) return `[${label}](${local[1]})`;
+  const tr35 = /\/(tr35(?:-\w+)?)\.html(#.+)?$/.exec(target);
+  if (tr35) return `[${label}](${tr35[1]}.md${tr35[2]})`;
+  return link;
+}