fixup scripts; add Makefile for buttons (not a.out)

lib/pi-buttons/Makefile

@@ -0,0 +1,9 @@
+LIBS=-lpthread -lrt
+
+buttons: buttons.o
+	$(CC) -o $@ $^ $(CFLAGS) $(LIBS)
+
+.PHONY: clean
+
+clean:
+	rm -vf *.o buttons

lib/pi-buttons/setup.sh

@@ -1,15 +1,45 @@
 #!/bin/sh
 
-echo 17 > /sys/class/gpio/export
-echo 22 > /sys/class/gpio/export
-echo 27 > /sys/class/gpio/export
+if [ ! -w /sys/class/gpio/export ]; then
+    echo "$0 must be run with GPIO permissions (typically gpio group membership or root/sudo)"
+    exit 1
+fi
 
-sleep 3
+for gpionum in 17 22 27; do	
+  if [ ! -d /sys/class/gpio/gpio${gpionum} ]; then
+    echo "exporting GPIO ${gpionum}"
+    echo ${gpionum} > /sys/class/gpio/export
+  else
+    echo "GPIO ${gpionum} already exported"
+  fi
+done
 
-echo "in" > /sys/class/gpio/gpio17/direction
-echo "both" > /sys/class/gpio/gpio17/edge
+for gpionum in 17 27; do
+  if [ "$(/bin/cat /sys/class/gpio/gpio${gpionum}/direction)" != "in" ]; then
+    echo "setting GPIO ${gpionum} direction to inwards"
+    echo in > /sys/class/gpio/gpio${gpionum}/direction
+  else
+    echo "GPIO ${gpionum} already direction inwards"
+  fi
+  if [ "$(/bin/cat /sys/class/gpio/gpio${gpionum}/edge)" != "both" ]; then
+    echo "setting GPIO ${gpionum} signal edge to both"
+    echo both > /sys/class/gpio/gpio${gpionum}/edge
+  else
+    echo "GPIO ${gpionum} signal edge already both"
+  fi
+done
 
-echo "in" > /sys/class/gpio/gpio27/direction
-echo "both" > /sys/class/gpio/gpio27/edge
 
-echo "out" > /sys/class/gpio/gpio22/direction
+if [ "$(/bin/cat /sys/class/gpio/gpio22/direction)" != "out" ]; then
+  echo "setting GPIO 22 direction to outwards"
+  echo out > /sys/class/gpio/gpio22/direction
+else
+  echo "GPIO 22 already direction outwards"
+fi
+
+if [ ! -x $(dirname $0)/buttons ]; then
+  echo "building buttons executable"
+  /usr/bin/make -C $(dirname $0)
+else
+  echo "buttons executable exists"
+fi

openaps-menu.sh

@@ -1,3 +1,12 @@
-#!/bin/bash
+#!/bin/bash -e
 
-(cd lib/pi-buttons/ && ./setup.sh && ./a.out) & node index.js
+topdir=$(dirname $0)
+buttonsdir=${topdir}/lib/pi-buttons
+
+# GPIO setup and buttons utility build
+${buttonsdir}/setup.sh
+
+# needs to create a socket in cwd
+(cd ${buttonsdir} && ./buttons &)
+
+exec node ${topdir}/index.js