Add build-docs-l10n.sh for multi-language mdbook docs

Generates translated documentation by swapping locale .ftl files
into en-US.ftl (since uudoc hardcodes that filename), re-running
uudoc with translated tldr examples, and building mdbook per language.

scripts/build-docs-l10n.sh

@@ -0,0 +1,106 @@
+#!/bin/bash
+# Build coreutils mdbook docs for all languages
+# Usage: build-docs-l10n.sh <coreutils-dir>
+#
+# Expects:
+# - uudoc already built (cargo run --bin uudoc done previously)
+# - l10n locales already copied into coreutils/src/uu/*/locales/
+# - English docs already built in coreutils/docs/book/
+#
+# For each language, swaps the target locale's .ftl files into en-US.ftl
+# (since uudoc hardcodes that filename), re-runs uudoc, then builds mdbook.
+
+set -euo pipefail
+
+COREUTILS_DIR="${1:?Usage: $0 <coreutils-dir>}"
+
+# Languages to build (besides English which is already built)
+declare -A LANG_MAP=(
+  [fr]="fr-FR" [de]="de" [es]="es-ES" [it]="it" [pt]="pt" [pt-BR]="pt-BR"
+  [ja]="ja" [ko]="ko" [ru]="ru" [zh]="zh-Hans" [uk]="uk" [sv]="sv"
+  [pl]="pl" [tr]="tr" [ar]="ar" [cs]="cs" [da]="da" [id]="id"
+)
+
+TMPDIR=$(mktemp -d)
+trap 'rm -rf "$TMPDIR"' EXIT
+
+# Save a copy of all en-US.ftl files for restoration
+cp -r "$COREUTILS_DIR/src" "$TMPDIR/src-backup"
+
+# Find uudoc binary (already built by the English docs step)
+UUDOC="$COREUTILS_DIR/target/debug/uudoc"
+if [ ! -x "$UUDOC" ]; then
+  UUDOC="$COREUTILS_DIR/target/release/uudoc"
+fi
+
+# Save English tldr.zip for restoration
+EN_TLDR="$TMPDIR/tldr-en.zip"
+cp "$COREUTILS_DIR/docs/tldr.zip" "$EN_TLDR" 2>/dev/null || true
+
+# Download and repack translated tldr archives (uudoc expects pages/ prefix)
+echo "Downloading translated tldr archives..."
+for lang in "${!LANG_MAP[@]}"; do
+  raw="$TMPDIR/tldr-raw-${lang}.zip"
+  curl -sfL "https://github.com/tldr-pages/tldr/releases/download/v2.3/tldr-pages.${lang}.zip" \
+    -o "$raw" || true
+  if [ -f "$raw" ]; then
+    repack_dir="$TMPDIR/tldr-repack-${lang}"
+    mkdir -p "$repack_dir/pages"
+    (cd "$repack_dir" && unzip -o "$raw" -d pages/ > /dev/null 2>&1)
+    (cd "$repack_dir" && zip -r "$TMPDIR/tldr-${lang}.zip" pages/ > /dev/null 2>&1)
+    rm -rf "$repack_dir" "$raw"
+  fi
+done
+
+restore_en() {
+  # Restore all en-US.ftl files from backup
+  for util_dir in "$COREUTILS_DIR"/src/uu/*/locales/; do
+    util=$(basename "$(dirname "$util_dir")")
+    backup="$TMPDIR/src-backup/uu/$util/locales/en-US.ftl"
+    [ -f "$backup" ] && cp "$backup" "${util_dir}en-US.ftl"
+  done
+  local uucore_backup="$TMPDIR/src-backup/uucore/src/lib/mods/locales/en-US.ftl"
+  [ -f "$uucore_backup" ] && cp "$uucore_backup" "$COREUTILS_DIR/src/uucore/src/lib/mods/locales/en-US.ftl"
+  # Restore English tldr
+  [ -f "$EN_TLDR" ] && cp "$EN_TLDR" "$COREUTILS_DIR/docs/tldr.zip"
+}
+
+cd "$COREUTILS_DIR"
+
+for lang in "${!LANG_MAP[@]}"; do
+  echo "=== Building $lang docs ==="
+  ftl_name="${LANG_MAP[$lang]}"
+
+  # Swap in translated tldr.zip (fall back to English if unavailable)
+  if [ -f "$TMPDIR/tldr-${lang}.zip" ]; then
+    cp "$TMPDIR/tldr-${lang}.zip" docs/tldr.zip
+  fi
+
+  # uudoc hardcodes en-US.ftl — swap in the target locale temporarily
+  for util_dir in src/uu/*/locales/; do
+    if [ -f "${util_dir}${ftl_name}.ftl" ]; then
+      cp "${util_dir}${ftl_name}.ftl" "${util_dir}en-US.ftl"
+    fi
+  done
+  if [ -f "src/uucore/src/lib/mods/locales/${ftl_name}.ftl" ]; then
+    cp "src/uucore/src/lib/mods/locales/${ftl_name}.ftl" "src/uucore/src/lib/mods/locales/en-US.ftl"
+  fi
+
+  # Re-generate markdown with swapped locale
+  if ! "$UUDOC" 2>&1 | tail -3; then
+    echo "WARNING: uudoc failed for $lang, skipping"
+    restore_en
+    continue
+  fi
+
+  # Build mdbook to a language-specific output directory
+  sed -i '/^multilingual/d' docs/book.toml
+  (cd docs && mdbook build -d "book-${lang}")
+
+  # Restore en-US.ftl files for next iteration
+  restore_en
+
+  echo "Built $lang docs in docs/book-${lang}/"
+done
+
+echo "All translated docs built."