feat: refactor home-manager configs

modules/home-manager/cli/cli.nix

@@ -0,0 +1,70 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.feature.cli;
+in
+{
+  options.feature.cli = {
+    enable = lib.mkEnableOption "Set up the CLI";
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.packages = with pkgs; [
+      starship
+      tree
+    ];
+
+    programs.fish = {
+      enable = true;
+      functions.fish_greeting = "";
+      shellInitLast = lib.mkIf (lib.strings.hasSuffix "darwin" pkgs.system) ''
+        eval $(/opt/homebrew/bin/brew shellenv)
+      '';
+    };
+
+    programs.fzf = {
+      enable = true;
+      enableFishIntegration = true;
+    };
+
+    programs.zsh = lib.mkIf (lib.strings.hasSuffix "darwin" pkgs.system) {
+      enable = true;
+
+      # zsh is a POSIX compliant shell and a safe default, but if it's an interactive
+      # shell and fish is not in the parent processes (i.e. I'm not deliberately starting
+      # zsh to use interactively from fish) then just launch fish.
+      initContent = ''
+        [[ $- == *i* ]] || return
+
+        is_parent_fish() {
+          local ppid=$$
+          while [[ $ppid -ne 1 ]]; do
+            local ppname=$(ps -p $ppid -o comm=)
+            if [[ "$ppname" == *fish* ]]; then
+              return 1
+            fi
+            ppid=$(ps -o ppid= -p $ppid)
+          done
+          return 0
+        }
+
+        if is_parent_fish
+        then
+          exec fish -l
+        fi
+      '';
+    };
+
+    programs.starship = {
+      enable = true;
+      enableFishIntegration = true;
+      enableInteractive = true;
+      enableTransience = true;
+      settings = builtins.fromTOML (builtins.readFile ./starship.toml);
+    };
+  };
+}