Animated gifs on the terminal. What else.

1 files changed, 106 insertions, 0 deletions

diff --git a/gifterm.py b/gifterm.py
new file mode 100755
index 0000000..04e7c04
--- /dev/null
+++ b/gifterm.py
@@ -0,0 +1,106 @@
+#!/usr/bin/env python
+
+import os, sys, argparse, os.path, json, time, signal, atexit
+#NOTE: This script uses pygments for RGB->X256 conversion since pygments is
+#readily available. If you do not like pygments (e.g. because it is large),
+#you could patch in something like https://github.com/magarcia/python-x256
+#(but don't forget to send me a pull request ;)
+from pygments.formatters import terminal256
+from PIL import Image, GifImagePlugin, ImageSequence
+
+formatter = terminal256.Terminal256Formatter()
+reset_sequence = terminal256.EscapeSequence(fg=formatter._closest_color(0,0,0), bg=formatter._closest_color(0,0,0)).reset_string()
+clear_screen = '\033[H\033[2J'
+cursor_invisible = '\033[?25l'
+cursor_visible = '\033[?25h'
+
+def termify_pixels(img):
+	sx, sy = img.size
+	out = ''
+
+	fg,bg = None,None
+	fgd,bgd = {},{}
+	def bgescape(color):
+		nonlocal bg, bgd
+		if bg == color:
+			return ''
+		bg=color
+		if color == (0,0,0,0):
+			return '\033[49m'
+		if color in bgd:
+			return bgd[color]
+		r,g,b,_ = color
+		bgd[color] = '\033[48;5;'+str(formatter._closest_color(r,g,b))+'m'
+		return bgd[color]
+
+	def fgescape(color):
+		nonlocal fg, fgd
+		if fg == color:
+			return ''
+		fg=color
+		r,g,b,_ = color
+		fgd[color] = '\033[38;5;'+str(formatter._closest_color(r,g,b))+'m'
+		return fgd[color]
+
+	def balloon(x,y):
+		if x+1 == img.size[0] or img.im.getpixel((x+1, y)) != (0,255,0,127):
+			w = 1
+			while x-w >= 0 and img.im.getpixel((x-w, y)) == (0,255,0,127):
+				w += 1
+			return '$balloon{}$'.format(w)
+		return ''
+
+	for y in range(0, sy, 2):
+		for x in range(sx):
+			coltop = img.im.getpixel((x, y))
+			colbot = img.im.getpixel((x, y+1)) if y+1 < img.size[1] else (0,0,0,0)
+
+			if coltop[3] == 127: #Control colors
+				out += reset_sequence
+				out += {(255, 0, 0, 127): lambda x,y:'$\\$',
+						(0, 0, 255, 127): lambda x,y:'$/$',
+						(0, 255, 0, 127): balloon
+					   }.get(coltop, lambda x,y:' ')(x,y)
+				continue
+
+			if coltop[3] != 255:
+				coltop = (0,0,0,0)
+			if colbot[3] != 255:
+				colbot = (0,0,0,0)
+
+			#Da magicks: ▀█▄
+			c,cf = '▀','█'
+			te,be = fgescape,bgescape
+			if coltop == (0,0,0,0) or ((coltop == bg or colbot == fg) and not colbot == (0,0,0,0)):
+				c,cf,te,be = '▄',' ',be,te
+			if colbot == coltop:
+				c,te,be = cf,te,te
+			out += te(coltop) + be(colbot) + c
+		out = out.rstrip() + '\n'
+	return out[:-1] + reset_sequence + '\n'
+
+if __name__ == '__main__':
+	parser = argparse.ArgumentParser(description='Render pixel images on 256-color ANSI terminals')
+	parser.add_argument('image', type=str)
+	args = parser.parse_args()
+	img = Image.open(args.image)
+	frames = []
+	palette = img.getpalette()
+	for frame in ImageSequence.Iterator(img):
+		f = frame.copy()
+		#This works around a known bug in Pillow
+		#See also: http://stackoverflow.com/questions/4904940/python-converting-gif-frames-to-png
+		f.putpalette(palette)
+		f = f.convert("RGBA")
+		frames.append(termify_pixels(f))
+
+	print(cursor_invisible)
+	atexit.register(lambda:print(cursor_visible))
+	signal.signal(signal.SIGTERM, lambda signum, stack_frame: exit(1))
+
+	while True:
+		for frame in frames:
+			print(clear_screen, reset_sequence)
+			print(frame)
+			time.sleep(img.info['duration']/1000.0)
+