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path: root/users/sterni/machines/ingeborg/http/krank.sterni.lv.nix
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{ lib, pkgs, depot, config, ... }:

let
  inherit (depot.users.sterni.nix.html) __findFile esc;

  repos = [
    {
      name = "mirror/depot";
      branch = "canon";
      overviewLink = "https://code.tvl.fyi";
      linkFormat = ''"https://code.tvl.fyi/tree/\\1?h=$(git rev-parse HEAD)#n\\2"'';
    }

    rec {
      name = "mirror/nixpkgs";
      branch = "haskell-updates";
      overviewLink = "https://github.com/nixos/nixpkgs/tree/${branch}";
      linkFormat = ''"https://github.com/nixos/nixpkgs/blob/$(git rev-parse HEAD)/\\1?plain=1#L\\2"'';
      paths = [
        "doc/languages-frameworks/haskell.section.md"
        "maintainers/scripts/haskell"
        "pkgs/development/compilers/elm"
        "pkgs/development/compilers/ghc"
        "pkgs/development/compilers/ghcjs"
        "pkgs/development/haskell-modules"
        "pkgs/development/tools/haskell"
        "pkgs/test/haskell"
        "pkgs/top-level/haskell-packages.nix"
        "pkgs/top-level/release-haskell.nix"
      ];
    }
  ];

  krankUnitName = { name, branch, ... }:
    "krank-${lib.replaceStrings [ "/" ] [ "-" ] name}-${branch}";

  # TODO(sterni): deduplicate with git.sterni.lv.nix
  mirrorUnitName = { name, ... }:
    "mirror-${lib.strings.sanitizeDerivationName name}";

  repoRoute = { name, branch, ... }:
    "/${name}/${branch}.html";

  navigation = <nav> { } (
    <ul> { } (
      [
        (<li> { } (<a> { href = "/"; } "index"))
      ]
      ++ builtins.map
        (
          { name, branch, ... }@repo:
          [
            (<a> { href = repoRoute repo; } (esc "${name}(${branch})"))
            " "
          ]
        )
        repos
    )
  );

  commonHead = [
    (<meta> { charset = "utf-8"; } null)
    (<link> { rel = "stylesheet"; href = "/fieber.css"; } null)
    (<link> { rel = "stylesheet"; href = "/custom.css"; } null)
  ];

  generateRepoReport =
    { name
    , branch
    , overviewLink ? "https://git.sterni.lv/${name}?h=${branch}"
    , linkFormat
    , paths ? [ ]
    }@repo:

    let
      title = link: [
        "References to Closed Issues in "
        ((display: if link then <a> { href = overviewLink; } display else display)
          [
            (esc name)
            "("
            (esc branch)
            ")"
          ])
      ];
    in

    pkgs.writeShellScript "generate-${krankUnitName repo}" ''
      set -euo pipefail
      export PATH=${
        lib.escapeShellArg (lib.makeBinPath [
          pkgs.coreutils
          pkgs.findutils
          pkgs.git
          pkgs.krank
          depot.users.sterni.krank2html
        ])
      }

      REPO="$(mktemp -d)"
      DOTTIME="$(date --utc "+%Y-%m-%d %H·%M")$(date "+%:::z")"
      readonly REPO DOTTIME

      cleanup() {
        rm -rf "$REPO"
      }
      trap cleanup EXIT

      git clone \
        -b "${branch}" \
        --single-branch \
        --reference "/srv/git/${name}.git" \
        "file:///srv/git/${name}.git" \
        "$REPO"

      cd "$REPO"

      KRANK2HTML_LINK_FORMAT=${linkFormat}
      export KRANK2HTML_LINK_FORMAT

      printf '<!doctype html><html lang="en">'
      printf '%s' ${lib.escapeShellArg (
        <head> {} [
          commonHead
          (<title> {} (title false))
        ]
      )}
      printf '<body>'
      printf '%s' ${lib.escapeShellArg (
        <header> {} [
          navigation
          (<h1> {} (title true))
        ]
      )}

      set +e
      # No support for credential files at the moment
      # https://github.com/guibou/krank/issues/87#issuecomment-2948915145
      git -c 'core.quotePath=false' ls-files -z -- ${lib.escapeShellArgs paths} \
        | xargs -0 krank --issuetracker-githubkey "$(cat "$CREDENTIALS_DIRECTORY/github")" \
        | krank2html
      krank_status=$?
      set -e

      [[ "$krank_status" == 0 ]] || \
        printf '<p>Warning: Errors occurred during generation. Report may be incomplete.'

      printf '</main>'
      printf '<footer><p>last updated: %s</footer>' "$DOTTIME"
    '';

  secretName = "krank-github-token";
in

{
  imports = [
    ../../../modules/atomically-update.nix
    ./nginx.nix
    ./git.sterni.lv.nix # reuses git repositories
  ];

  config = lib.mkMerge ([
    {
      age.secrets = {
        "${secretName}" = {
          file = depot.users.sterni.secrets."${secretName}.age";
        };
      };

      services.nginx.virtualHosts."krank.sterni.lv" = {
        enableACME = true;
        forceSSL = true;
        root = depot.users.sterni.nix.build.website "krank.sterni.lv" { } {
          "index.html" = pkgs.writeText "krank.sterni.lv/index.html" (
            (<html> { lang = "en"; } [
              (<head> { } [
                commonHead
                (<title> { } "krank.sterni.lv")
              ])
              (<body> { } [
                navigation
              ])
            ])
          );

          # TODO(sterni): update automatically
          "fieber.css" = pkgs.fetchurl {
            url = "https://raw.githubusercontent.com/zichy/fieber/0db7d17361cb0de3790b8e68acce9bc12f31e635/fieber.css";
            sha256 = "02c5d2cqwqz6mxa8l3wwd3fh741k7j2mc7q5wj5ghkvq3g1s9la0";
          };

          "custom.css" = pkgs.writeText "krank.sterni.lv/custom.css" ''
            :root { --w-body: 100%; }
          '';
        };
      };

      users = {
        users.krank = {
          isSystemUser = true;
          group = "krank";
        };
        groups.krank = { };
      };
    }
  ]
  ++ builtins.map
    (
      repo:
      let
        unitName = krankUnitName repo;
        cfg = config.services.depot.atomically-update.${unitName};
      in

      {
        services.depot.atomically-update.${unitName} = {
          exec = {
            path = generateRepoReport repo;
            output = "stdout";
          };
          user = "krank";
          group = "krank";
        };

        services.nginx.virtualHosts."krank.sterni.lv".extraConfig = ''
          location = ${repoRoute repo} {
            alias ${cfg.location};
          }
        '';

        systemd.services.${mirrorUnitName repo} = {
          before = [ "${cfg.serviceName}.service" ];
          wants = [ "${cfg.serviceName}.service" ];
        };
        systemd.services.${cfg.serviceName} = {
          after = [ "${mirrorUnitName repo}.service" ];
          serviceConfig = {
            # Originally, a shared StateDirectory for all reports was used.
            # This isn't supported by systemd and may break in some situations:
            # https://github.com/systemd/systemd/issues/7090
            LoadCredential = "github:${config.age.secretsDir + "/${secretName}"}";
          };
        };
      }
    )
    repos
  );
}