ledger: add module

Add module for https://www.ledger-cli.org/

.github/CODEOWNERS

@@ -158,6 +158,8 @@ Makefile                                              @thiagokokada
 
 /modules/programs/lazygit.nix                         @kalhauge
 
+/modules/programs/ledger.nix                          @marsam
+
 /modules/programs/less.nix                            @pamplemousse
 /tests/modules/programs/less                          @pamplemousse
 

modules/misc/news.nix

@@ -726,6 +726,13 @@ in
           A new module is available: 'programs.pls'.
         '';
       }
+
+      {
+        time = "2022-10-06T23:06:08+00:00";
+        message = ''
+          A new module is available: 'programs.ledger'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -101,6 +101,7 @@ let
     ./programs/kitty.nix
     ./programs/kodi.nix
     ./programs/lazygit.nix
+    ./programs/ledger.nix
     ./programs/less.nix
     ./programs/lesspipe.nix
     ./programs/lf.nix

modules/programs/ledger.nix

@@ -0,0 +1,39 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.programs.ledger;
+
+in {
+  meta.maintainers = [ maintainers.marsam ];
+
+  options.programs.ledger = {
+    enable = mkEnableOption "ledger, a double-entry accounting system";
+
+    package = mkPackageOption pkgs "ledger" { };
+
+    extraConfig = mkOption {
+      type = types.lines;
+      default = "";
+      example = literalExpression ''
+        --sort date
+        --effective
+        --date-format %Y-%m-%d
+      '';
+      description = ''
+        Configuration written to <filename>$XDG_CONFIG_HOME/ledger/ledgerrc</filename>.
+        See <link xlink:href="https://www.ledger-cli.org/3.0/doc/ledger3.html#Detailed-Option-Description"/>
+        for explanation about possible values.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    home.packages = [ cfg.package ];
+
+    xdg.configFile."ledger/ledgerrc" =
+      mkIf (cfg.extraConfig != "") { text = cfg.extraConfig; };
+  };
+}