data display

dotfiles-old/bin/data

@@ -0,0 +1,138 @@
+#!/bin/sh
+
+set -e
+
+# these files (separated by newlines) will have the current CPU temperature
+# multiplied by $CPU_TEMP_SCALE. this script divides the file contents by scale
+# and displays that temperature (assumed to be in Celsius units)
+CPU_TEMP_FILES="/sys/devices/platform/coretemp.0/hwmon/hwmon4/temp2_input
+/sys/devices/platform/coretemp.0/hwmon/hwmon4/temp3_input"
+CPU_TEMP_SCALE=1000
+
+# format for the date (by default in this script, ISO 8601)
+alias date="date '+%Y-%m-%dT%T'"
+
+# how fast to refresh the display (in seconds, will be substituted with 1 if
+# not an integer)
+INTERVAL=1
+
+# enable if you have issues with missing `stris` etc. enabled by default.
+# will save negligible time with shells that don't spawn new processes for
+# test(1)
+POSIXLY_CORRECT=1
+
+# this URL will have in plain text the public IP address from which it was
+# accessed
+PUBLIC_IP_FETCH_URL="http://ifconfig.io/"
+
+get_battery_status() {
+	# this is a dirty hack.
+	# acpi | awk '{print $4}' will print the battery percentage,
+	# and s/,$// strips the trailing comma.
+	# acpi -a will just print the power adapter status.
+	printf "%b" "$(acpi | awk '{print $4}' | sed 's/,$//') ($(acpi -a))"
+	return
+}
+
+get_cpu_temp() {
+	RETVAL=""
+	# iterate over files, adjust, print out "%dC "
+	for file in $CPU_TEMP_FILES;
+		do RETVAL="$RETVAL$(fdivide $(cat $file) $CPU_TEMP_SCALE)C "
+	done
+	# in-line python (bet you've never seen that before) that
+	# strips off trailing whitespace. could be done with sed but
+	# this was more fun
+	printf "%b" "$RETVAL" \
+		| python -c "from sys import stdin; print(stdin.read().rstrip() + '\n')"
+	return
+}
+
+get_memory_usage() {
+	printf "%b" "$(free | head -n 2 | tail -n 1 | awk '{print $3 " used / " $2 " total"}')"
+	return
+}
+
+get_public_ip() {
+	curl "$PUBLIC_IP_FETCH_URL" --no-progress-meter 2>/dev/null || printf "[error fetching IP]\n"
+	return
+}
+
+# slow, so fetch it in advance
+PUBLIC_IP="$(get_public_ip)"
+
+printbar() {
+	printf "%b || %b || %b || %b || %b %b\n" \
+		"$(date)" \
+		"BAT: $(get_battery_status)" \
+		"CPU: $(get_cpu_temp)" \
+		"PuIP: $PUBLIC_IP" \
+		"MEM: $(get_memory_usage)" \
+		""
+	return
+}
+
+###############################################################################
+#    the following is for error prevention and doesn't need to be changed     #
+###############################################################################
+
+# POSIX shell version of fdivide
+fdivide_posix() {
+	[ -n "$2" ] && [ -n "$1" ] && [ -z "$3" ] \
+		|| return 1
+	printf "%b" "$(($2/$1))"
+	return
+}
+
+# [ -gt ] with better syntax
+gt_posix() {
+	while [ -n "$2" ]; do
+		[ "$1" -gt "$2" ] \
+			|| return 1
+		shift 1
+	done
+	return 0
+}
+
+# limited POSIX shell version of stris
+stris_posix() {
+	[ -n "$2" ] || return 1
+	case "$1" in
+	(int)
+		# https://stackoverflow.com/questions/2210349/test-whether-string-is-a-valid-integer
+		printf "$2" | grep '^-?[0-9]+$' >/dev/null \
+			&& return 0 \
+			|| return 1
+		;;
+	(uint)
+		printf "$2" | grep '^[0-9]+$' >/dev/null \
+			&& return 0 \
+			|| return 1
+		;;
+	(*)
+		return 1
+		;;
+	esac
+	return
+}
+
+if [ -n "$POSIXLY_CORRECT" ]; then
+	alias fdivide="fdivide_posix"
+	alias gt="gt_posix"
+	alias stris="stris_posix"
+fi
+
+[ -n "$INTERVAL" ] && stris int "$INTERVAL" \
+	|| INTERVAL=1 \
+	&& true
+[ -n "$CPU_TEMP_SCALE" ] && stris int "$CPU_TEMP_SCALE" && gt "$CPU_TEMP_SCALE" 0 \
+	|| CPU_TEMP_SCALE=1 \
+	&& true
+[ -n "$CPU_TEMP_FILES" ] \
+	|| alias get_cpu_temp="printf '[no temperature files specified]\n'" \
+	&& true
+
+while true; do
+	printbar
+	sleep "$INTERVAL"
+done