From c1214a56a6992dcc09c31761843e03ac8e19cb90 Mon Sep 17 00:00:00 2001
From: Harry Wagstaff <harry.wagstaff@gmail.com>
Date: Mon, 23 Apr 2018 11:34:08 +0100
Subject: [PATCH] Add ability to specify watch interval using environment
 variable WATCH_INTERVAL

---
 watch.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/watch.c b/watch.c
index a73eab59..a66beb97 100644
--- a/watch.c
+++ b/watch.c
@@ -668,6 +668,7 @@ int main(int argc, char *argv[])
 {
 	int optc;
 	double interval = 2;
+	char *interval_string;
 	char *command;
 	char **command_argv;
 	int command_length = 0;	/* not including final \0 */
@@ -701,6 +702,10 @@ int main(int argc, char *argv[])
 	textdomain(PACKAGE);
 	atexit(close_stdout);
 
+	interval_string = getenv("WATCH_INTERVAL");
+	if(interval_string != NULL) 
+		interval = strtod_nol_or_err(interval_string, _("Could not parse interval from WATCH_INTERVAL"));
+
 	while ((optc =
 		getopt_long(argc, argv, "+bced::ghn:pvtx", longopts, (int *)0))
 	       != EOF) {
@@ -730,10 +735,6 @@ int main(int argc, char *argv[])
 			break;
 		case 'n':
 			interval = strtod_nol_or_err(optarg, _("failed to parse argument"));
-			if (interval < 0.1)
-				interval = 0.1;
-			if (interval > UINT_MAX)
-				interval = UINT_MAX;
 			break;
 		case 'p':
 			precise_timekeeping = 1;
@@ -750,6 +751,11 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	if (interval < 0.1)
+		interval = 0.1;
+	if (interval > UINT_MAX)
+		interval = UINT_MAX;
+
 	if (optind >= argc)
 		usage(stderr);