feat: added assertions for automatically validation related options

Some programs and their configurations may depend on other programs.
For a truly portable configuration users must be able to get appropriate error messages if a options is enabled but its requirements (like a dependent option) is not met.
The build crashes for those and keeps the config concise.

1 files changed, 13 insertions, 0 deletions

diff --git a/modules/programs/fzf/assertions.nix b/modules/programs/fzf/assertions.nix
new file mode 100644
index 0000000..7c2e79c
--- /dev/null
+++ b/modules/programs/fzf/assertions.nix
@@ -0,0 +1,13 @@
+{ config, ... }:
+{
+  assertions = [
+    {
+      assertion =
+        !config.programs.fzf.enable || config.programs.zsh.enable || config.programs.bash.enable;
+      message = ''
+        programs.fzf is enabled but neither programs.zsh.enable nor programs.bash.enable is set.
+        fzf shell integration requires zsh or bash. Please enable at least one.
+      '';
+    }
+  ];
+}