diff --git a/modules/fish.nix b/modules/fish.nix
index f651254..3b546b8 100644
--- a/modules/fish.nix
+++ b/modules/fish.nix
@@ -111,44 +111,11 @@ in
 
           copy = {
             description = "Copy a file, or recursively copy a source directory into a destination";
-            body = ''
-              set count (count $argv | tr -d \n)
-              if test "$count" = 2; and test -d "$argv[1]"
-                  set from (echo $argv[1] | trim-right /)
-                  set to (echo $argv[2])
-                  command cp -r $from $to
-              else
-                  command cp $argv
-              end
-            '';
+            body = builtins.readFile ./fish/copy.fish;
           };
         };
 
-        interactiveShellInit = ''
-          # vi-style modal editing on the command line.
-          set -g fish_key_bindings fish_vi_key_bindings
-
-          set -gx EDITOR nvim
-          set -gx VISUAL nvim
-
-          # Render man pages through bat.
-          set -x MANROFFOPT "-c"
-          set -x MANPAGER "sh -c 'col -bx | bat -l man -p'"
-
-          # Tune the done plugin: only notify for commands past 10s, at low urgency.
-          set -g __done_min_cmd_duration 10000
-          set -g __done_notification_urgency_level low
-
-          # Prepend ~/.local/bin to PATH when it exists.
-          if test -d ~/.local/bin
-              fish_add_path ~/.local/bin
-          end
-
-          # Apply fish-compatible profile overrides if present.
-          if test -f ~/.fish_profile
-              source ~/.fish_profile
-          end
-        '';
+        interactiveShellInit = builtins.readFile ./fish/interactive-init.fish;
       };
     };
   };
diff --git a/modules/fish/copy.fish b/modules/fish/copy.fish
new file mode 100644
index 0000000..15b17a4
--- /dev/null
+++ b/modules/fish/copy.fish
@@ -0,0 +1,8 @@
+set count (count $argv | tr -d \n)
+if test "$count" = 2; and test -d "$argv[1]"
+    set from (echo $argv[1] | trim-right /)
+    set to (echo $argv[2])
+    command cp -r $from $to
+else
+    command cp $argv
+end
diff --git a/modules/fish/interactive-init.fish b/modules/fish/interactive-init.fish
new file mode 100644
index 0000000..08d8b9e
--- /dev/null
+++ b/modules/fish/interactive-init.fish
@@ -0,0 +1,23 @@
+# vi-style modal editing on the command line.
+set -g fish_key_bindings fish_vi_key_bindings
+
+set -gx EDITOR nvim
+set -gx VISUAL nvim
+
+# Render man pages through bat.
+set -x MANROFFOPT "-c"
+set -x MANPAGER "sh -c 'col -bx | bat -l man -p'"
+
+# Tune the done plugin: only notify for commands past 10s, at low urgency.
+set -g __done_min_cmd_duration 10000
+set -g __done_notification_urgency_level low
+
+# Prepend ~/.local/bin to PATH when it exists.
+if test -d ~/.local/bin
+    fish_add_path ~/.local/bin
+end
+
+# Apply fish-compatible profile overrides if present.
+if test -f ~/.fish_profile
+    source ~/.fish_profile
+end