add dynamic config commands

src/main.py

@@ -3,6 +3,7 @@
 # Akbar Rahman <hi@alv.cx>
 #
 
+import json
 import sys
 import subprocess
 import time
@@ -22,31 +23,45 @@ def get_args():
 
 
 def generate(config):
-    if config.get('template'):
-        img = Image.open(config['template'])
-    else:
-        img = Image.new(mode="RGBA", size = config['size'])
-
-    draw = ImageDraw.Draw(img)
-    with open(config['font'], "rb") as fp:
-        font = BdfFontFile.BdfFontFile(fp).to_imagefont()
-
     process = subprocess.run(config['command'], stdout=subprocess.PIPE, shell=False)
     if process.returncode != config.get('return_code', 0):
         # process did not run succesfully.
         # do not risk displaying that to user
         return
+    cmd_output = process.stdout.decode('utf-8').split('\n')
+    print(f"{cmd_output=}")
+    dynamic_config = {}
+    if len(cmd_output) > 2:
+        dynamic_config = tomllib.loads('\n'.join(cmd_output[:-2]))
+        text = cmd_output[-2]
+    else:
+        text = cmd_output[0]
 
-    text = process.stdout.decode('utf-8').split('\n')[0]
-    for filter in config.get('text_filters', []):
-        if filter == "lowercase":
-            text = text.lower()
-        elif filter == "uppercase":
-            text = text.upper()
+    print(f"{dynamic_config=}")
+    for key, val in dynamic_config.items():
+        config[key] = val
 
-    fill = config.get('text_fill')
-    fill = tuple(fill) if fill else None
-    draw.text(config.get('text_offset', [0, 0]), text, font=font, fill=fill)
+    if config.get('template'):
+        img = Image.open(config['template'])
+    else:
+        img = Image.new(mode="RGBA", size = config['size'])
+
+    print(f"{text=}")
+
+    if text:
+        draw = ImageDraw.Draw(img)
+        with open(config['font'], "rb") as fp:
+            font = BdfFontFile.BdfFontFile(fp).to_imagefont()
+
+        for filter in config.get('text_filters', []):
+            if filter == "lowercase":
+                text = text.lower()
+            elif filter == "uppercase":
+                text = text.upper()
+
+        fill = config.get('text_fill')
+        fill = tuple(fill) if fill else None
+        draw.text(config.get('text_offset', [0, 0]), text, font=font, fill=fill)
 
     img.save(config['output'], save_all=True, loop=0)