shell-integration: implement "no-cursor" option

Implement a "no-cursor" option for shell integration. This option acts
like "detect" but doesn't set the cursor shape.

src/config/Config.zig

@@ -532,6 +532,8 @@ keybind: Keybinds = .{},
 ///     configure your shell to enable the integration.
 ///   * "detect" - Detect the shell based on the filename.
 ///   * "fish", "zsh" - Use this specific shell injection scheme.
+///   * "no-cursor" - Detect the shell as in 'detect', but doesn't set cursor
+///     shapes
 ///
 /// The default value is "detect".
 @"shell-integration": ShellIntegration = .detect,
@@ -2182,6 +2184,7 @@ pub const ShellIntegration = enum {
     detect,
     fish,
     zsh,
+    @"no-cursor",
 };
 
 /// OSC 10 and 11 default color reporting format.

src/shell-integration/bash/ghostty.bash

@@ -41,8 +41,10 @@ function __ghostty_precmd() {
       PS2=$PS2'\[\e]133;B\a\]'
 
       # Cursor
+    if test "$GHOSTTY_SHELL_INTEGRATION_NO_CURSOR" != "1"; then
       PS1=$PS1'\[\e[5 q\]'
       PS0=$PS0'\[\e[0 q\]'
+    fi
 
       # Command
       PS0=$PS0'$(__ghostty_get_current_command)'

src/shell-integration/fish/vendor_conf.d/ghostty-shell-integration.fish

@@ -51,12 +51,17 @@ status --is-interactive || ghostty_exit
 function __ghostty_setup --on-event fish_prompt -d "Setup ghostty integration"
     functions -e __ghostty_setup
 
-    # Change the cursor to a beam on prompt.
-    function __ghostty_set_cursor_beam --on-event fish_prompt -d "Set cursor shape"
-        echo -en "\e[5 q"
-    end
-    function __ghostty_reset_cursor --on-event fish_preexec -d "Reset cursor shape"
-        echo -en "\e[0 q"
+    # Check if we are setting cursors
+    set --local no_cursor "$GHOSTTY_SHELL_INTEGRATION_NO_CURSOR"
+
+    if test -z $no_cursor
+        # Change the cursor to a beam on prompt.
+        function __ghostty_set_cursor_beam --on-event fish_prompt -d "Set cursor shape"
+            echo -en "\e[5 q"
+        end
+        function __ghostty_reset_cursor --on-event fish_preexec -d "Reset cursor shape"
+            echo -en "\e[0 q"
+        end
     end
 
     # Setup prompt marking
@@ -82,7 +87,7 @@ function __ghostty_setup --on-event fish_prompt -d "Setup ghostty integration"
 
     # Report pwd. This is actually built-in to fish but only for terminals
     # that match an allowlist and that isn't us.
-   function __update_cwd_osc --on-variable PWD -d 'Notify capable terminals when $PWD changes'
+    function __update_cwd_osc --on-variable PWD -d 'Notify capable terminals when $PWD changes'
         if status --is-command-substitution || set -q INSIDE_EMACS
             return
         end
@@ -93,7 +98,9 @@ function __ghostty_setup --on-event fish_prompt -d "Setup ghostty integration"
     set --global fish_handle_reflow 1
 
     # Initial calls for first prompt
-    __ghostty_set_cursor_beam
+    if test -z $no_cursor
+        __ghostty_set_cursor_beam
+    end
     __ghostty_mark_prompt_start
     __update_cwd_osc
 end

src/shell-integration/zsh/ghostty-integration

@@ -200,21 +200,23 @@ _ghostty_deferred_init() {
     functions[_ghostty_preexec]+="
         builtin print -rnu $_ghostty_fd \$'\\e]2;'\"\${(V)1}\"\$'\\a'"
 
-    # Enable cursor shape changes depending on the current keymap.
-    # This implementation leaks blinking block cursor into external commands
-    # executed from zle. For example, users of fzf-based widgets may find
-    # themselves with a blinking block cursor within fzf.
-    _ghostty_zle_line_init _ghostty_zle_line_finish _ghostty_zle_keymap_select() {
-        case ${KEYMAP-} in
-            # Blinking block cursor.
-            vicmd|visual) builtin print -nu "$_ghostty_fd" '\e[1 q';;
-            # Blinking bar cursor.
-            *)            builtin print -nu "$_ghostty_fd" '\e[5 q';;
-        esac
-    }
-    # Restore the blinking default shape before executing an external command
-    functions[_ghostty_preexec]+="
-        builtin print -rnu $_ghostty_fd \$'\\e[0 q'"
+    if [[ "$GHOSTTY_SHELL_INTEGRATION_NO_CURSOR" != 1 ]]; then
+      # Enable cursor shape changes depending on the current keymap.
+      # This implementation leaks blinking block cursor into external commands
+      # executed from zle. For example, users of fzf-based widgets may find
+      # themselves with a blinking block cursor within fzf.
+      _ghostty_zle_line_init _ghostty_zle_line_finish _ghostty_zle_keymap_select() {
+	  case ${KEYMAP-} in
+	      # Blinking block cursor.
+	      vicmd|visual) builtin print -nu "$_ghostty_fd" '\e[1 q';;
+	      # Blinking bar cursor.
+	      *)            builtin print -nu "$_ghostty_fd" '\e[5 q';;
+	  esac
+      }
+      # Restore the blinking default shape before executing an external command
+      functions[_ghostty_preexec]+="
+	  builtin print -rnu $_ghostty_fd \$'\\e[0 q'"
+    fi
 
     # Some zsh users manually run `source ~/.zshrc` in order to apply rc file
     # changes to the current shell. This is a terrible practice that breaks many

src/termio/Exec.zig

@@ -812,6 +812,13 @@ const Subprocess = struct {
                 .detect => null,
                 .fish => .fish,
                 .zsh => .zsh,
+                .@"no-cursor" => nc: {
+                    // We add an environment variable for the shell integration
+                    // scripts to pick up to prevent setting cursor shapes.
+                    // Setting to "no_cursor" means we will detect the shell
+                    try env.put("GHOSTTY_SHELL_INTEGRATION_NO_CURSOR", "1");
+                    break :nc null;
+                },
             };
 
             const dir = opts.resources_dir orelse break :shell null;