devenv: add more modules

1 files changed, 56 insertions, 0 deletions

diff --git a/modules/devenv/dotfiles.nix b/modules/devenv/dotfiles.nix
new file mode 100644
index 0000000..8b8d95b
--- /dev/null
+++ b/modules/devenv/dotfiles.nix
@@ -0,0 +1,56 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  cfg = config.dotfiles;
+  dotfilesToIgnore = lib.attrNames (lib.filterAttrs (_: {gitignore, ...}: gitignore) cfg);
+in {
+  options.dotfiles = lib.mkOption {
+    type = with lib.types;
+    # this cannot be a lazyAttrsOf, see https://nixos.org/manual/nixos/unstable/#sec-option-types-composed
+      attrsOf (submodule {
+        options = {
+          gitignore =
+            lib.mkEnableOption ""
+            // {
+              default = true;
+              description = "Whether git should ignore this dotfile, typically if it is generated to contain absolute paths.";
+            };
+          text = lib.mkOption {
+            type = lib.types.lines;
+            default = "";
+            description = "The content of the dotfile.";
+          };
+        };
+      });
+  };
+
+  config.enterShell =
+    lib.mkIf (cfg != {})
+    (''
+        echo Installing dotfiles...
+      ''
+      + lib.concatStringsSep "\n" (lib.mapAttrsToList (
+          name: {
+            text,
+            gitignore,
+          }:
+          # this has to be done here to avoid infinite recursion
+          let
+            content =
+              text
+              + lib.optionalString (name == ".gitignore") ''
+                # dotfiles
+                ${lib.concatStringsSep "\n" dotfilesToIgnore}
+              '';
+          in ''
+            ${
+              if gitignore
+              then "ln -s"
+              else "cp"
+            } "${builtins.toFile name content}" "${name}"
+          ''
+        )
+        cfg));
+}