tools: add md2man.sh tool, using lowdown.

Signed-off-by: Rusty Russell <[email protected]>

tools/md2man.sh

@@ -0,0 +1,15 @@
+#! /bin/sh
+
+if [ $# != 1 ]; then
+    echo "Usage: $0 <markdownpage>" >&2
+    exit 1
+fi
+SOURCE=$1
+SECTION="$(basename "$SOURCE" .md | cut -d. -f2-)"
+TITLE="$(basename "$(basename "$SOURCE" .md)" ."$SECTION" | tr '[:lower:]' '[:upper:]')"
+
+# First two lines are title, which needs to be turned into NAME for proper manpage
+# format.  mrkd used to do this for us, lowdown(1) doesn't.
+TITLELINE="$(head -n1 "$SOURCE")"
+
+(echo "NAME"; echo "----"; echo "$TITLELINE"; tail -n +3 "$SOURCE") | lowdown -s --out-no-smarty -Tman -m "title:$TITLE" -m "section:$SECTION" -m "source:Core Lightning $VERSION" -m "shiftheadinglevelby:-1"