Alternative approach by unconditionally setting xdgDataDirs and checking features with nu

src/shell-integration/README.md

@@ -76,6 +76,18 @@ allowing us to automatically integrate with the shell. For details
 on the Fish startup process, see the
 [Fish documentation](https://fishshell.com/docs/current/language.html).
 
+### Nushell
+
+For `nushell` Ghostty prepends to the `XDG_DATA_DIRS` directory. Nushell automatically
+loads configuration files in `<XDG_DATA_DIRS>/nushell/vendor/autoload/*.nu` on startup. These
+directories are represented in `Nu` by `$nu.vendor-autoload-dirs`. For more details see
+
+[Nushell documentation](https://www.nushell.sh/book/configuration.html#configuration-overview)
+
+> [!NOTE]
+>
+> Ghostty implements concretely the `ssh-*` features. The rest of the features are supported mostly out of the box by Nushell.
+
 ### Zsh
 
 For `zsh`, Ghostty sets `ZDOTDIR` so that it loads our configuration
@@ -90,17 +102,3 @@ fi
 ```
 
 Shell integration requires Zsh 5.1+.
-
-### Nushell
-
-For `nushell` Ghostty prepends to the `XDG_DATA_DIRS` directory. Nushell automatically
-loads configuration files in `<XDG_DATA_DIRS>/nushell/vendor/autoload/*.nu` on startup. These
-directories are represented in `Nu` by `$nu.vendor-autoload-dirs`. For more details see
-
-[Nushell documentation](https://www.nushell.sh/book/configuration.html#configuration-overview)
-
-> [!NOTE]
->
-> Ghostty only prepends to `XDG_DATA_DIRS` in the case where the `ssh-*` features are enabled.
-> Nushell supports most features out of the box, so other shell integration features are not
-> necessary.

src/shell-integration/nushell/ghostty-ssh-integration.nu

@@ -3,7 +3,10 @@
 # and propagates COLORTERM, TERM_PROGRAM, and TERM_PROGRAM_VERSION
 # check your sshd_config on remote host to see if these variables are accepted
 def set_ssh_env []: nothing -> record<ssh_term: string, ssh_opts: list<string>> {
-    return {ssh_term: "xterm-256color", ssh_opts: ["-o", "SetEnv COLORTERM=truecolor", "-o", "SendEnv TERM_PROGRAM TERM_PROGRAM_VERSION"]}
+  return {
+    ssh_term: "xterm-256color",
+    ssh_opts: ["-o", "SetEnv COLORTERM=truecolor", "-o", "SendEnv TERM_PROGRAM TERM_PROGRAM_VERSION"]
+  }
 }
 
 # Enables automatic terminfo installation on remote hosts.
@@ -11,7 +14,10 @@ def set_ssh_env []: nothing -> record<ssh_term: string, ssh_opts: list<string>>
 # connecting to hosts that lack it. 
 # Requires infocmp to be available locally and tic to be available on remote hosts.
 # Caches installations to avoid repeat installations.
-def set_ssh_terminfo [ssh_opts: list<string>, ssh_args: list<string>] {
+def set_ssh_terminfo [
+  ssh_opts: list<string>, 
+  ssh_args: list<string>
+]: [nothing -> record<ssh_term: string, ssh_opts: list<string>>] {
   mut ssh_opts = $ssh_opts
   let ssh_cfg = ^ssh -G ...($ssh_args)
     | lines
@@ -47,25 +53,24 @@ def set_ssh_terminfo [ssh_opts: list<string>, ssh_args: list<string>] {
       } | path join "socket"
     )
 
-    let master_parts = $ssh_opts ++ ["-o", "ControlMaster=yes", "-o", $"ControlPath=($ctrl_path)", "-o", "ControlPersist=60s"] ++ $ssh_args
+    let master_parts = $ssh_opts ++ ["-o" "ControlMaster=yes" "-o" $"ControlPath=($ctrl_path)" "-o" "ControlPersist=60s"] ++ $ssh_args
 
-    let terminfo_present = (
-      ^ssh ...($master_parts ++ ["infocmp", "xterm-ghostty"])
-      | complete
-      | $in.exit_code == 0
+    ($terminfo_data) | ^ssh ...(
+      $master_parts ++
+      [
+      '
+      infocmp xterm-ghostty >/dev/null 2>&1 && exit 0
+      command -v tic >/dev/null 2>&1 || exit 1
+      mkdir -p ~/.terminfo 2>/dev/null && tic -x - 2>/dev/null && exit 0
+      exit 1'
+      ]
     )
-
-    if (not $terminfo_present) {
-      (
-        $terminfo_data
-        | ^ssh ...($master_parts ++ ["mkdir", "-p", "~/.terminfo", "&&", "tic", "-x", "-"])
-      )
-      | complete
-      | if $in.exit_code != 0 {
-        print "Warning: Failed to install terminfo."
-        return {ssh_term: "xterm-256color", ssh_opts: $ssh_opts}
-      }
+    | complete
+    | if $in.exit_code != 0 {
+      print "Warning: Failed to install terminfo."
+      return {ssh_term: "xterm-256color" ssh_opts: $ssh_opts}
     }
+
     ^$ghostty_bin ...(["+ssh-cache", $"--add=($ssh_id)"]) o+e>| ignore
     $ssh_opts ++= ["-o", $"ControlPath=($ctrl_path)"]
   }
@@ -74,7 +79,7 @@ def set_ssh_terminfo [ssh_opts: list<string>, ssh_args: list<string>] {
 }
 
 # SSH Integration
-export def --wrapped ssh [...ssh_args: string] {
+export def --wrapped ssh [...ssh_args: string]: any -> any {
   if ($ssh_args | is-empty) {
     return (^ssh)
   }

src/shell-integration/nushell/vendor/autoload/bootstrap-integration.nu

@@ -0,0 +1,29 @@
+let enable_integration = $env.GHOSTTY_SHELL_FEATURES | split row ',' 
+  | where ($it in ["ssh-env" "ssh-terminfo"]) 
+  | is-not-empty
+
+let ghostty_ssh_file = $env.GHOSTTY_RESOURCES_DIR
+  | path join "shell-integration" "nushell" "ghostty-ssh-integration.nu"
+
+let ssh_integration_file = $nu.data-dir | path join "ghostty-ssh-integration.nu"
+let ssh_file_exists = $ssh_integration_file | path exists
+
+# TOD0: In case of an update to the `ghostty-ssh-integration.nu` file
+# the file wont be updated here, so we need to support
+# saving the new file once there is an update
+
+match [$enable_integration $ssh_file_exists] {
+  [true false] => {
+    # $nu.data-dir is not created by default
+    # https://www.nushell.sh/book/configuration.html#startup-variables
+    $nu.data-dir | path exists | if (not $in) { mkdir $nu.data-dir }
+    open $ghostty_ssh_file | save $ssh_integration_file
+  }
+  [false true] => {
+    # We need to check if the user disabled `ssh-integration` and thus
+    # the integration file needs to be removed so it doesnt get sourced by
+    # the `source-integration.nu` file
+    rm $ssh_integration_file
+  }
+  _ => { }
+}

src/shell-integration/nushell/vendor/autoload/source-integration.nu

@@ -0,0 +1,11 @@
+# Sourcing the `ghostty-integration.nu` cant be on the
+# `bootstrap-integration.nu` file because it tries to resolve the `sourced`
+# file at parsing time, which would make it source nothing.
+
+# But here we rely on the fact that `boostrap-integration.nu` gets parsed
+# and executed first, and then we can count on `ssh_integration_file` being available
+
+#https://www.nushell.sh/book/thinking_in_nu.html#example-dynamically-generating-source
+
+const ssh_integration_file = $nu.data-dir | path join "ghostty-ssh-integration.nu"
+source (if ($ssh_integration_file | path exists) { $ssh_integration_file } else { null })