Show error output from failed helpers

Usually, when the pager or the editor fail and return a non-zero
exit status, they display a message on the standard error output.

We might also try to redirect this output to show_mesage() but
it might not fit as a whole, so, given the relative rareness
of this situation, this slight inconsistency shouldn't be much
of an issue.

It'd also be possible to redirect the output to run_pager() but
in doing so, we might make the problem recursive.

1 files changed, 6 insertions, 0 deletions

diff --git a/sdn.cpp b/sdn.cpp
index b9d18c4..37caf19 100644
--- a/sdn.cpp
+++ b/sdn.cpp
@@ -865,6 +865,12 @@ fun run_program (initializer_list<const char*> list, const string &filename) {
 			if (WSTOPSIG (status) == SIGTSTP)
 				kill (child, SIGCONT);
 		tcsetpgrp (STDOUT_FILENO, getpgid (0));
+
+		if (WIFEXITED (status) && WEXITSTATUS (status)) {
+			printf ("Helper returned non-zero exit status %d.  "
+				"Press Enter to continue.\n", WEXITSTATUS (status));
+			string dummy; getline (cin, dummy);
+		}
 	}
 
 	refresh ();