gersemi: init (#485)

Author: vaisriv

examples/formatter-gersemi.toml

@@ -0,0 +1,6 @@
+# Example generated by ../examples.sh
+[formatter.gersemi]
+command = "gersemi"
+excludes = []
+includes = ["CMakeLists.txt", "CMakeLists.txt.in", "*.cmake", "*.cmake.in"]
+options = ["-i"]

programs/gersemi.nix

@@ -0,0 +1,56 @@
+{
+  lib,
+  config,
+  mkFormatterModule,
+  ...
+}:
+let
+  cfg = config.programs.gersemi;
+in
+{
+  meta.maintainers = [ "vaisriv" ];
+
+  imports = [
+    (mkFormatterModule {
+      name = "gersemi";
+      args = [ "-i" ];
+      includes = [
+        "CMakeLists.txt"
+        "CMakeLists.txt.in"
+        "*.cmake"
+        "*.cmake.in"
+      ];
+    })
+  ];
+
+  options.programs.gersemi = with lib; {
+    indent = mkOption {
+      type = types.nullOr (types.either (types.enum [ "tabs" ]) types.int);
+      default = null;
+      example = 2;
+      description = ''
+        Number of spaces used to indent or 'tabs' for indenting with tabs [default: 4]
+      '';
+    };
+    lineLength = mkOption {
+      type = types.nullOr types.int;
+      default = null;
+      example = 100;
+      description = ''
+        Maximum line length in characters. [default: 80]
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    settings.formatter.gersemi.options =
+      (lib.optionals (!isNull cfg.indent) [
+        "--indent"
+        (toString cfg.indent)
+      ])
+      ++ (lib.optionals (!isNull cfg.lineLength) [
+        "--line-length"
+        (toString cfg.lineLength)
+      ]);
+  };
+}