Add spdx and lint

Author: makermelissa

Wearable_Time_Lapse_Camera/timelapse.py

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2024 Melissa leBlanc-Williams for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
 #!/usr/bin/env python3
 
 import os
@@ -15,51 +19,56 @@
 # For intervals <2 sec, better just to use raspistill's timelapse feature.
 
 # Configurable stuff...
-INTERVAL = 15            # Time between captures, in seconds
-WIDTH = 1280             # Image width in pixels
-HEIGHT = 720             # Image height in pixels
-QUALITY = 51             # JPEG image quality (0-100)
-DEST = "/home/pi/timelapse" # Destination directory (MUST NOT CONTAIN NUMBERS)
-PREFIX = "img"           # Image prefix (MUST NOT CONTAIN NUMBERS)
-HALT_PIN = board.D21         # Halt button GPIO pin (other end to GND)
-LED_PIN = board.D5           # Status LED pin (v2 Pi cam lacks built-in LED)
+INTERVAL = 15  # Time between captures, in seconds
+WIDTH = 1280  # Image width in pixels
+HEIGHT = 720  # Image height in pixels
+QUALITY = 51  # JPEG image quality (0-100)
+DEST = "/home/pi/timelapse"  # Destination directory (MUST NOT CONTAIN NUMBERS)
+PREFIX = "img"  # Image prefix (MUST NOT CONTAIN NUMBERS)
+HALT_PIN = board.D21  # Halt button GPIO pin (other end to GND)
+LED_PIN = board.D5  # Status LED pin (v2 Pi cam lacks built-in LED)
 COMMAND = "libcamera-still -n --width {width} --height {height} -q {quality} --thumb none -t 250 -o {outfile}"
-#COMMAND = "raspistill -n -w {width -h {height} -q {quality} -th none -t 250 -o {outfile}"
-prevtime = 0             # Time of last capture (0 = do 1st image immediately)
+# COMMAND = "raspistill -n -w {width -h {height} -q {quality} -th none -t 250 -o {outfile}"
 
 def main():
-    global prevtime
+    prevtime = 0  # Time of last capture (0 = do 1st image immediately)
     halt = digitalio.DigitalInOut(HALT_PIN)
     halt.switch_to_input(pull=digitalio.Pull.UP)
     led = digitalio.DigitalInOut(LED_PIN)
     led.switch_to_output()
 
-	# Create destination directory (if not present)
+    # Create destination directory (if not present)
     os.makedirs(DEST, exist_ok=True)
 
     # Find index of last image (if any) in directory, start at this + 1
     files = os.listdir(DEST)
-    numbers = [int(re.search(r'\d+', f).group()) for f in files if f.startswith(PREFIX) and re.search(r'\d+', f)]
+    numbers = [
+        int(re.search(r"\d+", f).group())
+        for f in files
+        if f.startswith(PREFIX) and re.search(r"\d+", f)
+    ]
     numbers.sort()
     frame = numbers[-1] + 1 if numbers else 1
     currenttime = time.monotonic()
 
     while True:
-        while time.monotonic() < prevtime + INTERVAL: # Until next image capture time
+        while time.monotonic() < prevtime + INTERVAL:  # Until next image capture time
             currenttime = time.monotonic()
             # Check for halt button -- hold >= 2 sec
             while not halt.value:
                 if time.monotonic() >= currenttime + 2:
                     led.value = True
-                    os.system('shutdown -h now')
+                    os.system("shutdown -h now")
         outfile = f"{DEST}/{PREFIX}{frame:05}.jpg"
         # echo $OUTFILE
         led.value = True
-        os.system(COMMAND.format(width=WIDTH, height=HEIGHT, quality=QUALITY, outfile=outfile))
+        os.system(
+            COMMAND.format(width=WIDTH, height=HEIGHT, quality=QUALITY, outfile=outfile)
+        )
         led.value = False
-        frame += 1 # Increment image counter
-        prevtime = currenttime # Save image cap time
+        frame += 1  # Increment image counter
+        prevtime = currenttime  # Save image cap time
 
 
 if __name__ == "__main__":
-    main()
+    main()