have argparse report the proper command name

share/functions/isatty.fish

@@ -1,6 +1,6 @@
 function isatty -d "Tests if a file descriptor is a tty"
     set -l options 'h/help'
-    argparse $options -- $argv
+    argparse -n isatty $options -- $argv
     or return
 
     if set -q _flag_help

share/functions/nextd.fish

@@ -1,6 +1,6 @@
 function nextd --description "Move forward in the directory history"
     set -l options 'h/help' 'l/list'
-    argparse $options -- $argv
+    argparse -n nextd $options -- $argv
     or return
 
     if set -q _flag_help

share/functions/trap.fish

@@ -17,7 +17,7 @@ end
 
 function trap -d 'Perform an action when the shell receives a signal'
     set -l options 'h/help' 'l/list-signals' 'p/print'
-    argparse $options -- $argv
+    argparse -n trap $options -- $argv
     or return
 
     if set -q _flag_help

share/functions/umask.fish

@@ -150,7 +150,7 @@ end
 
 function umask --description "Set default file permission mask"
     set -l options 'h/help' 'p/as-command' 'S/symbolic'
-    argparse $options -- $argv
+    argparse -n umask $options -- $argv
     or return
 
     if set -q _flag_help