From 23d182d7c0d0c9ffd4a5f6189d6c05fe964a5d96 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Fri, 5 May 2023 11:56:41 +0200
Subject: list_events: Catch common error '-i input.h5'

---
 src/list_events.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'src')

diff --git a/src/list_events.c b/src/list_events.c
index 67b27119..ffdcab80 100644
--- a/src/list_events.c
+++ b/src/list_events.c
@@ -72,6 +72,7 @@ int main(int argc, char *argv[])
 	FILE *ifh;
 	FILE *ofh;
 	DataTemplate *dtempl;
+	int err;
 
 	/* Long options */
 	const struct option longopts[] = {
@@ -132,6 +133,19 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 
+	if ( is_hdf5_file(input, &err) ) {
+		ERROR("Your input file appears to be an HDF5 file.\n");
+		ERROR("The input file should be a list of data files, not the "
+		      "data file itself.\n");
+		ERROR("If you have only one input file, try the following:\n");
+		ERROR("  echo %s > files.lst\n", input);
+		ERROR("  list_events -i files.lst -o %s -g %s ...\n", output, geom);
+		return 1;
+	} else if ( err ) {
+		ERROR("Couldn't open '%s'\n", input);
+		return 1;
+	}
+
 	ifh = fopen(input, "r");
 	if ( ifh == NULL ) {
 		ERROR("Couldn't open '%s'\n", input);
-- 
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