cmake: Force color in the tests

For littlecheck/pexpect this just unconditionally enables color.

I have no idea what happens if you run cmake outside of a terminal
, but the worst that can happen is that *errors* have color
escapes in them.

If someone figures out how to get cmake to tell us if it's running in
a terminal, we can add a check.

build_tools/littlecheck.py

@@ -688,6 +688,13 @@ def get_argparse():
         help="Show the files to be checked",
         default=False,
     )
+    parser.add_argument(
+        "--force-color",
+        action="store_true",
+        dest="force_color",
+        help="Force usage of color even if not connected to a terminal",
+        default=False,
+    )
     parser.add_argument("file", nargs="+", help="File to check")
     return parser
 
@@ -702,7 +709,7 @@ def main():
     failed = False
     skip_count = 0
     config = Config()
-    config.colorize = sys.stdout.isatty()
+    config.colorize = args.force_color or sys.stdout.isatty()
     config.progress = args.progress
     fields = config.colors()
 

build_tools/pexpect_helper.py

@@ -143,7 +143,7 @@ class SpawnedProc(object):
         if name not in env:
             raise ValueError("'%s' variable not found in environment" % name)
         exe_path = env.get(name)
-        self.colorize = sys.stdout.isatty()
+        self.colorize = sys.stdout.isatty() or env.get("FISH_FORCE_COLOR", "0") == "1"
         self.messages = []
         self.start_time = None
         self.spawn = pexpect.spawn(exe_path, env=env, encoding="utf-8", timeout=timeout, **kwargs)