aux/workflow/: Add <link rel="alternate" for translated CommonMark pages

Implements #task-43e9d7dd-987a-2f71-629f-28a4cc69be1e.

1 files changed, 26 insertions, 2 deletions

diff --git a/aux/workflow/public.sh b/aux/workflow/public.sh
index 38613de..2c8c36a 100755
--- a/aux/workflow/public.sh
+++ b/aux/workflow/public.sh
@@ -1,6 +1,9 @@
 #!/bin/sh
 set -eu
 
+TLD="$(cat aux/tld.txt)"
+. aux/lib.sh
+
 PROJECT_UC=
 while getopts 'n:N:m:o:l:' flag; do
 	case "$flag" in
@@ -39,6 +42,23 @@ assert_arg "${OUTDIR:-}"             '-o OUTDIR'
 assert_arg "${LANGS:-}"              '-l LANGS'
 PROJECT_UC="${PROJECT_UC:-$PROJECT}"
 
+
+alternates_for() {
+	ALTERNATES="$(mkstemp)"
+	lang="$1"
+	OUTNAME="$2"
+	for l in $LANGS; do
+		if [ "$l" = "$lang" ]; then
+			continue
+		fi
+		cat <<EOF >> "$ALTERNATES"
+<link rel="alternate" href="https://$TLD/$PROJECT/$l/$OUTNAME" hreflang="$l" />
+EOF
+	done
+	echo "$ALTERNATES"
+}
+
+
 mkdir -p "$OUTDIR"
 
 sh aux/workflow/TODOs.sh \
@@ -46,9 +66,13 @@ sh aux/workflow/TODOs.sh \
 
 for lang in $LANGS; do
 	mkdir -p "$OUTDIR/$lang/"
-	sh aux/workflow/commonmark.sh -N "$PROJECT" -t README    -l "$lang" \
+	sh aux/workflow/commonmark.sh \
+		-N "$PROJECT" -l "$lang" -t README    \
+		-H "$(alternates_for "$lang" '')" \
 		< "README.$lang.md"    > "$OUTDIR/$lang/index.html"
-	sh aux/workflow/commonmark.sh -N "$PROJECT" -t CHANGELOG -l "$lang" \
+	sh aux/workflow/commonmark.sh \
+		-N "$PROJECT" -l "$lang" -t CHANGELOG \
+		-H "$(alternates_for "$lang" 'CHANGELOG.html')" \
 		< "CHANGELOG.$lang.md" > "$OUTDIR/$lang/CHANGELOG.html"
 	ln -fs ../favicon.svg "$OUTDIR/$lang"
 done