Added metadata handling and a PNG metadata extraction tool

pngmeta.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python
+
+import os, sys, argparse
+from PIL import Image, PngImagePlugin
+
+parser = argparse.ArgumentParser(description='Print PNG metadata')
+parser.add_argument('image', type=str)
+args = parser.parse_args()
+img = Image.open(args.image)
+for k, v in img.info.items():
+	print('{:15}: {}'.format(k, v))

unpixelterm.py

@@ -33,49 +33,66 @@ def parse_escape_sequence(seq):
 
 def unpixelterm(text):
 	lines = text.split('\n')
+	metadata = {}
+	try:
+		first = lines.index('$$$')
+		second = lines[first+1:].index('$$$')
+		foo = [ line.split(': ') for line in lines[first+1:second] if line != '' ]
+		d = {}
+		for k,v in foo:
+			if k not in ['WIDTH', 'HEIGHT']:
+				d[k.lower()] = d.get(k.lower(), []) + [v]
+		metadata.update(d)
+		lines[first:] = lines[first+1+second+1:]
+	except:
+		pass
+
 	h = len(lines)*2
 	w = max([ len(re.sub(r'\x1b\[[0-9;]+m|\$.*\$', '', line)) for line in lines ])
 	img = Image.new('RGBA', (w, h))
 	fg, bg = (0,0,0,0), (0,0,0,0)
 	x, y = 0, 0
-	for escapeseq, specialstr, char, newline in re.findall(r'(\x1b\[[0-9;]+m)|(\$.*\$)|(.)|(\n)', text):
+	for line in lines:
-		if escapeseq:
+		for escapeseq, specialstr, char in re.findall(r'(\x1b\[[0-9;]+m)|(\$[^$]+\$)|(.)', line, re.DOTALL):
-			nfg, nbg = parse_escape_sequence(escapeseq)
+			if escapeseq:
-			fg, bg = nfg or fg, nbg or bg
+				nfg, nbg = parse_escape_sequence(escapeseq)
-		elif specialstr:
+				fg, bg = nfg or fg, nbg or bg
-			if specialstr.startswith('$$$'): #metadata
+			elif specialstr:
-				pass
+				if specialstr == '$\\$':
-			elif specialstr == '$\\$':
+					img.putpixel((x, y), (255, 0, 0, 127))
-				img.putpixel((x, y), (255, 0, 0, 127))
+					img.putpixel((x, y+1), (255, 0, 0, 127))
-				img.putpixel((x, y+1), (255, 0, 0, 127))
+					x += 1
+				elif specialstr == '$/$':
+					img.putpixel((x, y), (0, 0, 255, 127))
+					img.putpixel((x, y+1), (0, 0, 255, 127))
+					x += 1
+				else: #(should be a) balloon
+					bw = int(re.match(r'\$balloon([0-9]*)\$', specialstr).group(1))
+					for i in range(x, x+bw):
+						img.putpixel((i, y), (0, 255, 0, 127))
+						img.putpixel((i, y+1), (0, 255, 0, 127))
+					x += bw
+			elif char:
+				#Da magicks: ▀█▄
+				c = {' ': (bg, bg),
+					 '█': (fg, fg),
+					 '▀': (fg, bg),
+					 '▄': (bg, fg)}[char]
+				img.putpixel((x, y), c[0])
+				img.putpixel((x, y+1), c[1])
 				x += 1
-			elif specialstr == '$/$':
+		x, y = 0, y+2
-				img.putpixel((x, y), (0, 0, 255, 127))
+	return img, metadata
-				img.putpixel((x, y+1), (0, 0, 255, 127))
-				x += 1
-			else: #(should be a) balloon
-				bw = int(re.match(r'\$balloon([0-9]*)\$', specialstr).group(1))
-				for i in range(x, x+bw):
-					img.putpixel((i, y), (0, 255, 0, 127))
-					img.putpixel((i, y+1), (0, 255, 0, 127))
-				x += bw
-		elif char:
-			#Da magicks: ▀█▄
-			c = {' ': (bg, bg),
-				 '█': (fg, fg),
-				 '▀': (fg, bg),
-				 '▄': (bg, fg)}[char]
-			img.putpixel((x, y), c[0])
-			img.putpixel((x, y+1), c[1])
-			x += 1
-		else: #newline
-			x, y = 0, y+2
-	return img
 
 if __name__ == '__main__':
 	parser = argparse.ArgumentParser(description='Convert images rendered by pixelterm-like utilities back to PNG')
 	parser.add_argument('input', type=argparse.FileType('r'))
 	parser.add_argument('output', type=str)
 	args = parser.parse_args()
-	img = unpixelterm(args.input.read())
+	img, metadata = unpixelterm(args.input.read())
-	img.save(args.output)
+	print('Metadata:')
+	pnginfo = PngImagePlugin.PngInfo()
+	for k, v in metadata.items():
+		print('{:15}: {}'.format(k, '/'.join(v)))
+		pnginfo.add_text(k, '/'.join(v))
+	img.save(args.output, 'PNG', pnginfo=pnginfo)