Grey is really black, so add as black

Let's keep grey as a deprecated value, and can keep it around
indefinitely, no pressing need to remove it.

Co-authored-by: Hendrik Buschmeier <hbuschme@uni-bielefeld.de>

src/termcolor/__main__.py

@@ -7,7 +7,7 @@
 if __name__ == "__main__":
     print(f"Current terminal type: {os.getenv('TERM')}")
     print("Test basic colors:")
-    cprint("Grey color", "grey")
+    cprint("Black color", "black")
     cprint("Red color", "red")
     cprint("Green color", "green")
     cprint("Yellow color", "yellow")
@@ -18,18 +18,18 @@
     print("-" * 78)
 
     print("Test highlights:")
-    cprint("On grey color", on_color="on_grey")
+    cprint("On black color", on_color="on_black")
     cprint("On red color", on_color="on_red")
     cprint("On green color", on_color="on_green")
     cprint("On yellow color", on_color="on_yellow")
     cprint("On blue color", on_color="on_blue")
     cprint("On magenta color", on_color="on_magenta")
     cprint("On cyan color", on_color="on_cyan")
-    cprint("On white color", color="grey", on_color="on_white")
+    cprint("On white color", color="black", on_color="on_white")
     print("-" * 78)
 
     print("Test attributes:")
-    cprint("Bold grey color", "grey", attrs=["bold"])
+    cprint("Bold black color", "black", attrs=["bold"])
     cprint("Dark red color", "red", attrs=["dark"])
     cprint("Underline green color", "green", attrs=["underline"])
     cprint("Blink yellow color", "yellow", attrs=["blink"])
@@ -48,5 +48,5 @@
     print("-" * 78)
 
     print("Test mixing:")
-    cprint("Underline red on grey color", "red", "on_grey", ["underline"])
+    cprint("Underline red on black color", "red", "on_black", ["underline"])
     cprint("Reversed green on red color", "green", "on_red", ["reverse"])

src/termcolor/termcolor.py

@@ -53,7 +53,8 @@ def __getattr__(name: str) -> list[str]:
 
 
 HIGHLIGHTS = {
-    "on_grey": 40,
+    "on_black": 40,
+    "on_grey": 40,  # Actually black but kept for backwards compatibility
     "on_red": 41,
     "on_green": 42,
     "on_yellow": 43,
@@ -64,7 +65,8 @@ def __getattr__(name: str) -> list[str]:
 }
 
 COLORS = {
-    "grey": 30,
+    "black": 30,
+    "grey": 30,  # Actually black but kept for backwards compatibility
     "red": 31,
     "green": 32,
     "yellow": 33,
@@ -102,16 +104,16 @@ def colored(
     """Colorize text.
 
     Available text colors:
-        grey, red, green, yellow, blue, magenta, cyan, white.
+        black, red, green, yellow, blue, magenta, cyan, white.
 
     Available text highlights:
-        on_grey, on_red, on_green, on_yellow, on_blue, on_magenta, on_cyan, on_white.
+        on_black, on_red, on_green, on_yellow, on_blue, on_magenta, on_cyan, on_white.
 
     Available attributes:
         bold, dark, underline, blink, reverse, concealed.
 
     Example:
-        colored('Hello, World!', 'red', 'on_grey', ['bold', 'blink'])
+        colored('Hello, World!', 'red', 'on_black', ['bold', 'blink'])
         colored('Hello, World!', 'green')
     """
     if not _can_do_colour():