init (cerulean template)

hosts/modules/bashistrans.nix

@@ -0,0 +1,27 @@
+{pkgs, ...}: {
+  # I want to use fish as my login shell but it always goes terrible
+  # cause it isn't POSIX compliant, so instead Bash is my login and
+  # will just exec fish (^-^)
+  programs = {
+    fish.enable = true;
+
+    bash = {
+      blesh.enable = false; # ble.sh replacement for GNU readline
+      completion.enable = true;
+
+      interactiveShellInit = ''
+        # help bash transition into a beautiful fish!
+        if [[ -z $BASH_IS_TRANS ]]
+        then
+          if [[ $(${pkgs.procps}/bin/ps --no-header --pid=$PPID --format=comm) != "fish" && -z ''${BASH_EXECUTION_STRING} ]]
+          then
+            shopt -q login_shell && LOGIN_OPTION='--login' || LOGIN_OPTION=""
+            exec ${pkgs.fish}/bin/fish $LOGIN_OPTION
+          fi
+        fi
+        # bash is trans now! (no more transitioning required)
+        export BASH_IS_TRANS=true
+      '';
+    };
+  };
+}