mmgen.color: minor cleanups, define color names statically

mmgen/color.py

@@ -28,18 +28,20 @@ _colors = {
 	'blue':        (  75,       (34,1) ),
 	'magenta':     (  205,      (35,1) ),
 	'cyan':        (  122,      (36,1) ),
-	'pink':        (  218,      (35,1) ),
-	'orange':      (  216,      (31,1) ),
+
 	'gray':        (  246,      (30,1) ),
+	'orange':      (  216,      (31,1) ),
 	'purple':      (  141,      (35,1) ),
+	'pink':        (  218,      (35,1) ),
 
 	'melon':       (  222,      (33,1) ),
 	'brown':       (  173,      (33,0) ),
 	'grndim':      (  108,      (32,0) ),
+
 	'redbg':       ( (232,210), (30,101) ),
 	'grnbg':       ( (232,121), (30,102) ),
-	'blubg':       ( (232,75),  (30,104) ),
 	'yelbg':       ( (232,229), (30,103) ),
+	'blubg':       ( (232,75),  (30,104) ),
 }
 
 def nocolor(s):
@@ -77,7 +79,8 @@ def get_terminfo_colors(term=None):
 def init_color(num_colors='auto'):
 	assert num_colors in ('auto',8,16,256,0)
 
-	import mmgen.color as self
+	import sys
+	self = sys.modules[__name__]
 
 	if num_colors == 'auto':
 		import os
@@ -104,5 +107,30 @@ def init_color(num_colors='auto'):
 
 	set_vt100()
 
-for _c in _colors:
-	exec(f'{_c} = lambda s: s')
+# Each color name must be bound to an independent stub function with its own
+# address in memory.  The names themselves must never be redefined, since other
+# modules could import them before init_color() is run.  Instead, the code
+# objects of their associated functions are manipulated by init_color() to
+# enable/disable color.
+
+black   = lambda s: s
+red     = lambda s: s
+green   = lambda s: s
+yellow  = lambda s: s
+blue    = lambda s: s
+magenta = lambda s: s
+cyan    = lambda s: s
+
+gray    = lambda s: s
+orange  = lambda s: s
+purple  = lambda s: s
+pink    = lambda s: s
+
+melon   = lambda s: s
+brown   = lambda s: s
+grndim  = lambda s: s
+
+redbg   = lambda s: s
+grnbg   = lambda s: s
+yelbg   = lambda s: s
+blubg   = lambda s: s

pyproject.toml

@@ -24,7 +24,6 @@ ignore = [
 ]
 ignored-modules = [ # ignored for no-member, otherwise checked
 	"mmgen.proto.secp256k1.secp256k1",
-	"mmgen.color",
 	"mmgen.term",
 	"msvcrt",
 	"gmpy2",