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Improve ANSI escape code support in process_wallpaper.py

This commit is contained in:
Juhani Krekelä 2023-03-22 19:16:28 +02:00
parent 313453f5b3
commit 5d8d8a3406
1 changed files with 62 additions and 24 deletions
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86
process_wallpaper.py
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@ -1,5 +1,9 @@
import sys
from collections import namedtuple
Attribute = namedtuple('Attribute', ['fg', 'bg', 'bold'])
WIDTH = 80
HEIGHT = 25
# ANSI orders the colours black, red, green, yellow, blue, magenta, cyan, white
@ -24,7 +28,7 @@ origin_y = int(sys.argv[6])
assert 0 <= origin_y < HEIGHT
chars = [bytearray([0]*HEIGHT) for _ in range(WIDTH)]
attributes = [[(default_fgcolor, default_bgcolor)]*HEIGHT for _ in range(WIDTH)]
attributes = [[(Attribute(default_fgcolor, default_bgcolor, False))]*HEIGHT for _ in range(WIDTH)]
with open(infile, 'rb') as f:
ansitext = f.read()
@ -33,6 +37,9 @@ x = origin_x
y = origin_y
fgcolor = default_fgcolor
bgcolor = default_bgcolor
bold = False
error = False
line = 1
line_start = 0
@ -40,31 +47,59 @@ index = 0
while index < len(ansitext):
if ansitext[index:].startswith(b'\x1b['):
index += len(b'\x1b[')
escape_length = ansitext[index:].index(b'm')
escape = ansitext[index:index+escape_length]
for color_parameter in escape.split(b';'):
color_parameter = int(color_parameter)
if color_parameter == 39:
fgcolor = default_fgcolor
elif color_parameter == 49:
bgcolor = default_bgcolor
elif 30 <= color_parameter <= 37:
fgcolor = color_map[color_parameter - 30]
elif 40 <= color_parameter <= 47:
bgcolor = color_map[color_parameter - 40]
elif 90 <= color_parameter <= 97:
fgcolor = color_map[color_parameter - 90] + 8
elif 100 <= color_parameter <= 107:
bgcolor = color_map[color_parameter - 100] + 8
else:
print(f'{line},{index-line_start+1}: Unknown colour escape {color_parameter}')
index += escape_length + len(b'm')
escape_start = index
while index < len(ansitext) and ansitext[index] not in b'CDHJhm':
index += 1
escape_params = ansitext[escape_start:index]
escape_type = ansitext[index:index+1]
index += 1
if escape_type == b'C':
x += int(escape_params)
elif escape_type == b'D':
x -= int(escape_params)
elif escape_type == b'H':
row, column = escape_params.split(b';')
y = int(row) - 1
x = int(column) - 1
elif escape_type == b'J':
# Erase display
# We just ignore this, because why would you have
# erase command anywhere but at the start
pass
elif escape_type == b'h':
# Something nonstandard, ignore
pass
elif escape_type == b'm':
for color_parameter in escape_params.split(b';'):
color_parameter = int(color_parameter)
if color_parameter == 0:
bold = False
elif color_parameter == 1:
bold = True
elif color_parameter == 39:
fgcolor = default_fgcolor
elif color_parameter == 49:
bgcolor = default_bgcolor
elif 30 <= color_parameter <= 37:
fgcolor = color_map[color_parameter - 30]
elif 40 <= color_parameter <= 47:
bgcolor = color_map[color_parameter - 40]
elif 90 <= color_parameter <= 97:
fgcolor = color_map[color_parameter - 90] + 8
elif 100 <= color_parameter <= 107:
bgcolor = color_map[color_parameter - 100] + 8
else:
print(f'{line},{escape_start-line_start+1}: Unknown colour escape {color_parameter}')
error = True
else:
print(f'{line},{escape_start-line_start+1}: Unknown escape ^[[{escape_params.decode()}{escape_type.decode()}')
error = True
elif ansitext[index] == 13:
x = origin_x
index += 1
elif ansitext[index] == 10:
for i in range(x, WIDTH):
attributes[i][y] = (fgcolor, bgcolor)
attributes[i][y] = Attribute(fgcolor, bgcolor, bold)
x = origin_x
y += 1
index += 1
@ -72,13 +107,16 @@ while index < len(ansitext):
line_start = index
else:
chars[x][y] = ansitext[index]
attributes[x][y] = (fgcolor, bgcolor)
attributes[x][y] = Attribute(fgcolor, bgcolor, bold)
index += 1
x += 1
if error:
sys.exit(1)
with open(outfile, 'wb') as f:
for y in range(HEIGHT):
for x in range(WIDTH):
fgcolor, bgcolor = attributes[x][y]
fgcolor, bgcolor, bold = attributes[x][y]
char = chars[x][y]
f.write(bytes([char, (bgcolor<<4) | fgcolor]))
f.write(bytes([char, (bgcolor<<4) | fgcolor | (8 if bold else 0)]))