Added a whitelist to add cobra apps to to prevent non-cobra apps from

being excuted

completions.go

@@ -809,7 +809,7 @@ to your powershell profile.
 		Short: fmt.Sprintf(shortDesc, "nushell"),
 		Long: fmt.Sprintf(`Generate the autocompletion script for nushell.
 
-To configure completions:
+To configure the Nushell cobra external configurator for the first time:
       
   # 1. Copy the output of the command below:
   > %[1]s completion nushell 
@@ -822,7 +822,17 @@ To configure completions:
   # 4. Change the config block's external_completer line to be 
   external_completer: $cobra_completer
 
-  # 5. You will need to start a new shell for this setup to take effect.
+  # 5. You will need to start a new shell or for this setup to take effect.
+
+If you have already setup the cobra external configurator:
+
+  # 1. Edit the nushell config file:
+  > config nu
+
+  # 2. Modify the cobra_apps varible to contain this application:
+  > let cobra_apps = [ "othercobraapp", "%[1]s" ]
+
+  # 3. You will need to start a new shell or for this setup to take effect.
 
 `, c.Root().Name()),
 		Args:              NoArgs,

nushell_completions.go

@@ -24,64 +24,72 @@ import (
 func (c *Command) GenNushellCompletion(w io.Writer) error {
 	buf := new(bytes.Buffer)
 	WriteStringAndCheck(buf, fmt.Sprintf(`
+
+# A list of cobra that completion will be attempted for.
+# Add new apps to this list to enable completion for them.
+let cobra_apps = ["%[1]s"]
+
 # An external configurator that works with any cobra based
 # command line application (e.g. kubectl, minikube)
 let cobra_completer = {|spans| 
-
-  let ShellCompDirectiveError = %[1]d
-  let ShellCompDirectiveNoSpace = %[2]d
-  let ShellCompDirectiveNoFileComp = %[3]d
-  let ShellCompDirectiveFilterFileExt = %[4]d
-  let ShellCompDirectiveFilterDirs = %[5]d
- 
   let cmd = $spans.0
-  let last_span = ($spans | last | str trim)
 
-  # skip the first entry in the span (the command) and join the rest of the span to create __complete args
-  let cmd_args = ($spans | skip 1 | str join ' ') 
+  if not ($cobra_apps | where $it == $cmd | is-empty) {
+    let ShellCompDirectiveError = %[2]d
+    let ShellCompDirectiveNoSpace = %[3]d
+    let ShellCompDirectiveNoFileComp = %[4]d
+    let ShellCompDirectiveFilterFileExt = %[5]d
+    let ShellCompDirectiveFilterDirs = %[6]d
+   
+    let last_span = ($spans | last | str trim)
 
-  # If the last span entry was empty add "" to the end of the command args
-  let cmd_args = if ($last_span | is-empty) {
-    $'($cmd_args) ""'
+    # skip the first entry in the span (the command) and join the rest of the span to create __complete args
+    let cmd_args = ($spans | skip 1 | str join ' ') 
+
+    # If the last span entry was empty add "" to the end of the command args
+    let cmd_args = if ($last_span | is-empty) {
+      $'($cmd_args) ""'
+    } else {
+      $cmd_args
+    }
+
+    # The full command to be executed with active help disable (Nushell does not support active help)
+    let full_cmd = $'($cmd)_ACTIVE_HELP=0 ($cmd) __complete ($cmd_args)'
+
+    # Since nushell doesn't have anything like eval, execute in a subshell
+    let result = (do -i { nu -c $"'($full_cmd)'" } | complete)
+
+    # Create a record with all completion related info. 
+    # directive and directive_str are for posterity
+    let stdout_lines = ($result.stdout | lines)
+    let directive = ($stdout_lines | last | str trim | str replace ":" "" | into int)
+    let completions = ($stdout_lines | drop | parse -r '([\w\-\.:\+\=]*)\t?(.*)' | rename value description)
+
+    # Add space at the end of each completion
+    let completions = if $directive != $ShellCompDirectiveNoSpace {
+      ($completions | each {|it| {value: $"($it.value) ", description: $it.description}})
+    } else {
+      $completions
+    }
+
+    if $last_span =~ '=$' {
+      # return flag as part of the completion so that it doesn't get replaced
+      $completions | each {|it| $"($last_span)($it.value)" }
+    } else if $directive == $ShellCompDirectiveNoFileComp {
+      # Allow empty results as this will stop file completion
+      $completions
+    } else if ($completions | is-empty)  or  $directive == $ShellCompDirectiveError {
+      # Not returning null causes file completions to break
+      # Return null if there are no completions or ShellCompDirectiveError 
+      null
+    } else {
+      $completions
+    }
   } else {
-    $cmd_args
-  }
-
-  # The full command to be executed with active help disable (Nushell does not support active help)
-  let full_cmd = $'($cmd)_ACTIVE_HELP=0 ($cmd) __complete ($cmd_args)'
-
-  # Since nushell doesn't have anything like eval, execute in a subshell
-  let result = (do -i { nu -c $"'($full_cmd)'" } | complete)
-
-  # Create a record with all completion related info. 
-  # directive and directive_str are for posterity
-  let stdout_lines = ($result.stdout | lines)
-  let directive = ($stdout_lines | last | str trim | str replace ":" "" | into int)
-  let completions = ($stdout_lines | drop | parse -r '([\w\-\.:\+\=]*)\t?(.*)' | rename value description)
-
-  # Add space at the end of each completion
-  let completions = if $directive != $ShellCompDirectiveNoSpace {
-    ($completions | each {|it| {value: $"($it.value) ", description: $it.description}})
-  } else {
-    $completions
-  }
-
-  if $last_span =~ '=$' {
-    # return flag as part of the completion so that it doesn't get replaced
-    $completions | each {|it| $"($last_span)($it.value)" }
-  } else if $directive == $ShellCompDirectiveNoFileComp {
-    # Allow empty results as this will stop file completion
-    $completions
-  } else if ($completions | is-empty)  or  $directive == $ShellCompDirectiveError {
-    # Not returning null causes file completions to break
-    # Return null if there are no completions or ShellCompDirectiveError 
     null
-  } else {
-    $completions
   }
-
 }
-`, ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp,
+`, c.Name(), ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp,
 		ShellCompDirectiveFilterFileExt, ShellCompDirectiveFilterDirs))
 
 	_, err := buf.WriteTo(w)

shell_completions.md

@@ -72,6 +72,8 @@ PowerShell:
 
 Nushell:
   
+  # To configure the Nushell cobra external configurator for the first time:
+      
   # 1. Copy the output of the command below:
   > %[1]s completion nushell 
 
@@ -83,7 +85,17 @@ Nushell:
   # 4. Change the config block's external_completer line to be 
   external_completer: $cobra_completer
 
-  # 5. You will need to start a new shell for this setup to take effect.
+  # 5. You will need to start a new shell or for this setup to take effect.
+
+  # If you have already setup the cobra external configurator:
+
+  # 1. Edit the nushell config file:
+  > config nu
+  
+  # 2. Modify the cobra_apps varible to contain this application:
+  > let cobra_apps = [ "othercobraapp", "%[1]s" ]
+  
+  # 3. You will need to start a new shell for this setup to take effect.
 
 `,cmd.Root().Name()),
 	DisableFlagsInUseLine: true,