feat: hledger module

flake.nix

@@ -98,6 +98,7 @@
         };
 
       nixosModules = {
+        hledger = import modules/hledger.nix;
         htgen = import modules/htgen.nix;
         moodle-dl = import modules/moodle-dl.nix;
         networkmanager-declarative = import modules/networkmanager-declarative.nix;

modules/hledger.nix

@@ -0,0 +1,77 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.niveum.hledger;
+  hledger-git = pkgs.writers.writeDashBin "hledger-git" ''
+    LEDGER_DIR="$(dirname $LEDGER_FILE)"
+    GIT="${pkgs.git}/bin/git -C ''${LEDGER_DIR}"
+    if [ "$1" = entry ]; then
+      ${cfg.package}/bin/hledger balance -V > "$LEDGER_DIR/balance.txt"
+      $GIT add balance.txt
+      $GIT commit --all --message="$(date -Im)"
+    else
+      $GIT $*
+    fi
+  '';
+  hledger-edit = pkgs.writers.writeDashBin "hledger-edit" ''
+    LEDGER_DIR="$(dirname $LEDGER_FILE)"
+    $EDITOR ''${LEDGER_DIR}/current.journal
+  '';
+in {
+  options.services.hledger = {
+    enable = mkEnableOption "hledger";
+    ledgerFile = mkOption {
+      type = types.str;
+    };
+    server = {
+      enable = mkEnableOption "hledger server";
+      port = mkOption {
+        type = types.port;
+        default = 5000;
+      };
+      host = mkOption {
+        type = types.str;
+        default = "127.0.0.1";
+      };
+      capabilities = mkOption {
+        type = types.listOf (types.enum ["view" "add" "manage"]);
+        default = ["view" "add"];
+      };
+      flags = mkOption {
+        type = types.listOf types.str;
+        default = [];
+      };
+      user = mkOption {type = types.attrs;};
+      package = mkOption {
+        type = types.package;
+        default = pkgs.hledger-web;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.hledger-web = mkIf cfg.server.enable {
+      description = "hledger server";
+      wantedBy = ["multi-user.target"];
+      environment.LEDGER_FILE = cfg.ledgerFile;
+      serviceConfig = {
+        Restart = "always";
+        ExecStart = ''
+          ${cfg.server.package}/bin/hledger-web \
+          --port=${toString cfg.server.port} \
+          --host=${cfg.server.host} \
+          --capabilities=${concatStringsSep "," cfg.server.capabilities} \
+          ${concatStringsSep " " cfg.server.flags}
+        '';
+        User = cfg.server.user.name;
+        PrivateTemp = true;
+        RuntimeDirectory = "hledger-web";
+        WorkingDirectory = "%t/hledger-web";
+      };
+    };
+  };
+}