# Copyright 2021-2022 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# GDB reads some environment variables on startup, make sure it behaves
# correctly if these variables are defined but empty.

set all_env_vars { HOME XDG_CACHE_HOME LOCALAPPDATA XDG_CONFIG_HOME }

# Record the initial value of the index-cache directory.
clean_restart
set index_cache_directory ""
gdb_test_multiple "show index-cache directory" "" {
    -re -wrap "The directory of the index cache is \"(.*)\"\\." {
	set index_cache_directory $expect_out(1,string)
	set index_cache_directory [string_to_regexp $index_cache_directory]
	pass $gdb_test_name
    }
}

foreach_with_prefix env_var_name $all_env_vars {
    # Restore the original state of the environment variable.
    save_vars env($env_var_name) {
	set env($env_var_name) {}
	clean_restart

	# Verify that the empty environment variable didn't affect the
	# index-cache directory setting, that we still see the initial value.
	# "HOME" is different, because if that  one is unset, GDB isn't even
	# able to compute the default location.  In that case, we expect it to
	# be empty.
	if { $env_var_name == "HOME" } {
	    gdb_test "show index-cache directory" \
		"The directory of the index cache is \"\"\\."
	} else {
	    gdb_test "show index-cache directory" \
		"The directory of the index cache is \"$index_cache_directory\"\\."
	}
    }
}

# Try the same, but with all the env vars set to an empty value at the same
# time.
with_test_prefix "all env vars" {
    set save_vars_arg {}
    foreach env_var_name $all_env_vars {
	lappend save_vars_arg env($env_var_name)
    }

    # Restore the original state of all the environment variables.
    save_vars $save_vars_arg {
	foreach env_var_name $all_env_vars {
	    set env($env_var_name) {}
	}

	clean_restart

	gdb_test "show index-cache directory" \
	    "The directory of the index cache is \"\"\\."
    }
}