Add the same handler for fish

packages/safe-chain/src/shell-integration/startup-scripts/init-fish.fish

@@ -90,6 +90,20 @@ function wrapSafeChainCommand
     set original_cmd $argv[1]
     set cmd_args $argv[2..-1]
 
+    if not type -fq $original_cmd
+       # If the original command is not available, don't try to wrap it: invoke
+       # it transparently, so the shell can report errors as if this wrapper
+       # didn't exist. fish always adds extra debug information when executing
+       # missing commands from within a function, so after the "command not
+       # found" handler, there will be information about how the
+       # wrapSafeChainCommand function errored out. To avoid users assuming this
+       # is a safe-chain bug, display an explicit error message afterwards.
+       command $original_cmd $cmd_args
+       set oldstatus $status
+       echo "safe-chain tried to run $original_cmd but it doesn't seem to be installed in your \$PATH." >&2
+       return $oldstatus
+    end
+
     if type -q safe-chain
         # If the safe-chain command is available, just run it with the provided arguments
         safe-chain $original_cmd $cmd_args