nu: update fzf integration

nu/autoload/fzf.nu

@@ -9,13 +9,22 @@
 # used in considering for opening inside of tmux env.
 # - FZF_CTRL_T_COMMAND is the default command for Ctrl+T keybinding set for
 # this Nu script.
-# - FZF_DEFAULT_OPTS is a string
+# - FZF_DEFAULT_OPTS contains default arguments to be passed to fzf when
+# executing.
+# - FZF_ALT_C_COMMAND contains the executable and its arguments used for
+# entering directories (with Alt+C keybinding).
 
 let __fzf_defaults = [
     --height ($env.FZF_TMUX_HEIGHT? | default "40%")
     --bind=ctrl-z:ignore
+    --reverse
 ]
 
+let envconvert_cmdstring = {
+    from_string: { |s| $s | split row ' ' }
+    to_string: { |s| $s | str join ' ' }
+}
+
 def __fzf_select [...flags: string] {
     with-env {
         FZF_CTRL_T_COMMAND: ($env.FZF_CTRL_T_COMMAND? | default "fzf")
@@ -27,10 +36,14 @@ def __fzf_select [...flags: string] {
 
 def __fzf_cd [...flags: string] {
     with-env {
-        FZF_CTRL_T_COMMAND: ($env.FZF_CTRL_T_COMMAND? | default "fzf")
+        FZF_DEFAULT_OPTS: ($env.FZF_DEFAULT_OPTS | default $__fzf_defaults)
-        FZF_DEFAULT_OPTS: ($env.FZF_DEFAULT_OPTS? | default $__fzf_defaults)
     } {
-        fzf ...$env.FZF_DEFAULT_OPTS --reverse --walker=dir,hidden,follow ...$flags
+        if "FZF_ALT_C_COMMAND" in $env {
+            let command = $env.FZF_ALT_C_COMMAND
+            run-external ($command | get 0) ...($command | range 1..) | fzf ...$env.FZF_DEFAULT_OPTS ...$flags
+        } else {
+            fzf ...$env.FZF_DEFAULT_OPTS --walker=dir,hidden,follow ...$flags
+        }
     }
 }
 
@@ -50,6 +63,21 @@ $env.config.keybindings = $env.config.keybindings | append [
         }
     }
 
+    {
+        name: fzf_parent_select
+        modifier: alt
+        keycode: char_t
+        mode: [emacs vi_normal vi_insert]
+        event: {
+            send: ExecuteHostCommand
+            cmd: "commandline edit --insert (
+                __fzf_select '--multi' '--walker-root=../'
+                | lines
+                | str join ' '
+            )"
+        }
+    }
+
     {
         name: fzf_cd
         modifier: alt
@@ -61,3 +89,10 @@ $env.config.keybindings = $env.config.keybindings | append [
         }
     }
 ]
+
+$env.ENV_CONVERSIONS = $env.ENV_CONVERSIONS | merge deep --strategy=append {
+    FZF_CTRL_T_COMMAND: $envconvert_cmdstring
+    FZF_ALT_C_COMMAND: $envconvert_cmdstring
+    FZF_DEFAULT_OPTS: $envconvert_cmdstring
+    FZF_DEFAULT_COMMAND: $envconvert_cmdstring
+}