fix nushell not being default shell

modules/common/shell/default.nix

@@ -10,7 +10,9 @@ let
     const
     flatten
     getAttr
+    getExe
     mapAttrsToList
+    mkBefore
     mkOption
     sortOn
     toInt
@@ -67,6 +69,113 @@ in
       homeArgs:
       let
         config' = homeArgs.config;
+        nuExe = getExe (lib.head config'.shellsByPriority);
+        fishPromptBody = ''
+          set -l last_status $status
+
+          set -l pwd_display (prompt_pwd)
+          set -l workspace_root
+          set -l workspace_subpath
+
+          if command -sq jj
+            set workspace_root (jj workspace root ^/dev/null)
+            if test $status -eq 0 -a -n "$workspace_root"
+              set workspace_subpath (path relative -- $PWD $workspace_root)
+            end
+          end
+
+          set -l path_segment
+          if test -n "$workspace_root"
+            set -l workspace_name (basename "$workspace_root")
+            if test -n "$workspace_subpath" -a "$workspace_subpath" != "."
+              set path_segment (set_color bryellow)$workspace_name(set_color magenta)' → '(set_color blue)$workspace_subpath
+            else
+              set path_segment (set_color bryellow)$workspace_name
+            end
+          else
+            set path_segment (set_color cyan)$pwd_display
+          end
+
+          set -l prefix
+          if test $last_status -ne 0
+            set prefix (set_color brred)$last_status(set_color yellow)'┣'
+          end
+
+          set -l duration_segment
+          if set -q CMD_DURATION; and test "$CMD_DURATION" -gt 2000
+            set duration_segment (set_color brmagenta)(math --scale 2 "$CMD_DURATION / 1000")s
+          end
+
+          set -l left_prefix (set_color bryellow)'┏'
+          if test -n "$prefix"
+            set left_prefix "$left_prefix$prefix"
+          end
+          if test -n "$duration_segment"
+            set left_prefix "$left_prefix"(set_color bryellow)'┣'"$duration_segment"
+          end
+          set left_prefix "$left_prefix"(set_color bryellow)'━'(set_color normal)
+
+          set -l suffix_parts
+          if set -q IN_NIX_SHELL; and test -n "$IN_NIX_SHELL"
+            set suffix_parts $suffix_parts (set_color brblue)'nix'(set_color normal)
+          end
+          if set -q VIRTUAL_ENV_PROMPT; and test -n "$VIRTUAL_ENV_PROMPT"
+            set suffix_parts $suffix_parts (set_color brgreen)$VIRTUAL_ENV_PROMPT(set_color normal)
+          end
+
+          set -l suffix ""
+          if test (count $suffix_parts) -gt 0
+            set suffix ' '
+            for item in $suffix_parts
+              set suffix "$suffix"(set_color bryellow)'• '(set_color normal)"$item "
+            end
+            set suffix (string trim --right -- $suffix)
+          end
+
+          echo
+          echo -n "$left_prefix$path_segment$suffix"
+          echo
+          echo -n (set_color bryellow)'┃'(set_color normal)' '
+        '';
+        fishRightPromptBody = ''
+          set -l parts
+
+          if command -sq jj
+            set -l jj_status (jj --quiet --color always --ignore-working-copy log --no-graph --revisions @ --template '
+              separate(
+                " ",
+                if(empty, label("empty", "(empty)")),
+                coalesce(
+                  surround(
+                    "\"",
+                    "\"",
+                    if(
+                      description.first_line().substr(0, 24).starts_with(description.first_line()),
+                      description.first_line().substr(0, 24),
+                      description.first_line().substr(0, 23) ++ "…"
+                    )
+                  ),
+                  label(if(empty, "empty"), description_placeholder)
+                ),
+                bookmarks.join(", "),
+                change_id.shortest(),
+                commit_id.shortest(),
+                if(conflict, label("conflict", "(conflict)")),
+              )
+            ' ^/dev/null)
+            if test $status -eq 0 -a -n "$jj_status"
+              set parts $parts $jj_status
+            end
+          end
+
+          if set -q SSH_CONNECTION; and test -n "$SSH_CONNECTION"
+            set parts $parts (set_color brgreen)'@'(prompt_hostname)(set_color normal)
+          end
+
+          if test (count $parts) -gt 0
+            echo -n (string join ' ' $parts)
+          end
+        '';
         nuExecCondition =
           if config.isDarwin then
             ''
@@ -76,19 +185,45 @@ in
             ''[ -z "$INTELLIJ_ENVIRONMENT_READER" ] && [ -z "$skip" ] && [ -z "$SSH_TTY" ]'';
       in
       {
-        home.file.".zshrc".text = # zsh
+        programs.fish = {
+          enable = true;
+
+          interactiveShellInit = ''
+            set -g fish_greeting
+            set -g fish_key_bindings fish_vi_key_bindings
+            set -g fish_cursor_default block
+            set -g fish_cursor_insert line
+            set -g fish_cursor_replace_one underscore
+            set -g fish_cursor_visual block
+            set -g fish_cursor_external line
+          '';
+
+          shellInitLast = ''
+            if set -q GHOSTTY_RESOURCES_DIR
+              source "$GHOSTTY_RESOURCES_DIR/shell-integration/fish/vendor_conf.d/ghostty-shell-integration.fish" 2>/dev/null
+            end
+          '';
+
+          functions = {
+            fish_prompt.body = fishPromptBody;
+            fish_right_prompt.body = fishRightPromptBody;
+          };
+        };
+
+        programs.zsh.initContent = mkBefore # zsh
           ''
             export PATH="$HOME/.local/bin:/run/wrappers/bin:/run/current-system/sw/bin:/nix/var/nix/profiles/default/bin:/etc/profiles/per-user/$USER/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin''${PATH:+:}''${PATH}"
             source ${config'.home.sessionVariablesPackage}/etc/profile.d/hm-session-vars.sh
 
-          if ${nuExecCondition}; then
-            parent_cmd="$(ps -o command= -p "$PPID" 2>/dev/null || true)"
-            case "$parent_cmd" in
-              *"/Applications/Zed.app/Contents/MacOS/zed --printenv"*) return ;;
-            esac
-            SHELL='${lib.getExe <| lib.head config'.shellsByPriority}' exec "$SHELL"
-          fi
-        '';
+            if ${nuExecCondition}; then
+              parent_cmd="$(ps -o command= -p "$PPID" 2>/dev/null || true)"
+              case "$parent_cmd" in
+                *"/Applications/Zed.app/Contents/MacOS/zed --printenv"*) return ;;
+              esac
+              export SHELL='${nuExe}'
+              exec "$SHELL"
+            fi
+          '';
       }
     )
   ];