From c6beb7f5dfdfc222e211ad1b3b9755a4bf1f98d9 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Wed, 5 Jan 2022 15:31:13 +0100
Subject: system_usage.sh: check for command dependencies

---
 system_usage.sh | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/system_usage.sh b/system_usage.sh
index d4d3124..e582d4d 100755
--- a/system_usage.sh
+++ b/system_usage.sh
@@ -1,10 +1,8 @@
 #!/bin/bash
 
-#
 # system_usage.sh
 # (c) 2022 Jonas Gunz <himself@jonasgunz.de>
-# License: All rights reserved.
-#
+# License: MIT
 
 # USAGE:
 # ./system_usage.sh [TTY [BAUD]]
@@ -18,6 +16,16 @@ readonly PWM_CPU=0
 readonly PWM_RAM=1
 readonly PWM_TMP=2
 
+readonly DEPENDENCIES=( stty nproc sensors )
+for dep in "${DEPENDENCIES[@]}"; do
+	if ! which "$dep" > /dev/null 2>&1; then
+		echo "Command '$dep' missing."
+		FAILED=1
+	fi
+
+	test -n "$FAILED" && exit 1
+done
+
 echo "Trying to set $TTY to $BAUD"
 stty -F "$TTY" "$BAUD" -echo || exit 1
 echo OK!
-- 
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