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)

cmake/Tests.cmake

@@ -34,7 +34,7 @@ if(POLICY CMP0037)
   cmake_policy(SET CMP0037 OLD)
 endif()
 add_custom_target(test
-  COMMAND env CTEST_PARALLEL_LEVEL=${CTEST_PARALLEL_LEVEL}
+  COMMAND env CTEST_PARALLEL_LEVEL=${CTEST_PARALLEL_LEVEL} FISH_FORCE_COLOR=1
           ${CMAKE_CTEST_COMMAND} --force-new-ctest-process
           --output-on-failure --progress
   DEPENDS fish_tests tests_buildroot_target

tests/test.fish

@@ -30,8 +30,12 @@ set -g python (__fish_anypython)
 set -l skipped 0
 set -l failed 0
 if set -q files_to_test[1]
+    set -l force_color
+    test "$FISH_FORCE_COLOR" = 1
+    and set force_color --force-color
+
     $python -S ../littlecheck.py \
-        --progress \
+        --progress $force_color \
         -s fish=../test/root/bin/fish \
         -s fish_test_helper=../test/root/bin/fish_test_helper \
         $files_to_test