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#!/usr/bin/env nix-shell
#!nix-shell -i zsh -p zsh
set -euo pipefail
# cd into nixpkgs' root, get the store path of `systemd.man`
cd "$(dirname "$0")/../../.."
SYSTEMD_MAN_DIR="$(nix-build -A systemd.man)/share/man"
# For each manual section
for section in {1..8}; do
sec_dir="${SYSTEMD_MAN_DIR}/man${section}"
# skip section 3 (library calls)
! [[ $section -eq 3 ]] || continue
# for each manpage in that section (potentially none)
for manpage in ${sec_dir}/*(N); do
# strip the directory prefix and (compressed) manpage suffix
page="$(basename "$manpage" ".${section}.gz")"
# if this is the manpage of a service unit
if [[ "$page" =~ ".*\.service" ]]; then
# ... and a manpage exists without the `.service` suffix
potential_alias="${sec_dir}/${page%\.service}.${section}.gz"
! [[ -e "${potential_alias}" &&
# ... which points to the same file, then skip
"$(gunzip -c "${potential_alias}")" == ".so ${page}.${section}" ]] || continue
fi
# else produce a JSON fragment, with the link to the upstream manpage (as HTML)
echo " \"${page}(${section})\": \"https://www.freedesktop.org/software/systemd/man/${page}.html\","
done
done
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