# Copyright 2021 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/>.

# Test the flags within GDB that can be used to control how Python is
# initialized.

gdb_start

# Skip all tests if Python scripting is not enabled.
if { [skip_python_tests] } { continue }

gdb_exit

# Return a list containing two directory paths for newly created home
# directories.
#
# The first directory is a HOME style home directory, it contains a
# .gdbearlyinit file containing CONTENT.
#
# The second directory is an XDG_CONFIG_HOME style home directory, it
# contains a sub-directory gdb/, inside which is a file gdbearlyinit
# that also contains CONTENT.
#
# The PREFIX is used in both directory names and should be unique for
# each call to this function.
proc setup_home_directories { prefix content } {
    set home_dir [standard_output_file "${prefix}-home"]
    set xdg_home_dir [standard_output_file "${prefix}-xdg"]

    file mkdir $home_dir
    file mkdir "$xdg_home_dir/gdb"

    # Write the content into the HOME directory.
    set fd [open "$home_dir/.gdbearlyinit" w]
    puts $fd $content
    close $fd

    # Copy this from the HOME directory into the XDG_CONFIG_HOME
    # directory.
    file copy -force "$home_dir/.gdbearlyinit" "$xdg_home_dir/gdb/gdbearlyinit"

    return [list $home_dir $xdg_home_dir]
}

# Start GDB and check the status of the Python system flags that we
# can control from within GDB.
proc test_python_settings { exp_state } {
    gdb_start

    gdb_test_no_output "python import sys"

    foreach_with_prefix attr {ignore_environment dont_write_bytecode} {

	# If we are checking 'dont_write_bytecode', and we are
	# expecting this attribute to be 'off', then, if the user has
	# PYTHONDONTWRITEBYTECODE set in their environment, the result
	# will be 'on' instead of 'off', so override the expected
	# result here.
	#
	# The reason for this is, 'set python dont-write-bytecode' by
	# default is set to 'auto', which means, so long as 'set
	# python ignore-environment' is 'off', GDB will check for the
	# above environment variable.
	#
	# We could unset the environment variable, but until Python
	# 3.8 there was no way to control where .pyc files are placed,
	# and it feels bad to cause .pyc files to be created within
	# the users filesystem when they clearly don't want them.
	#
	# And so, we adjust the expected results.  Hopefully, between
	# all GDB developers some will test GDB with this environment
	# variable unset.
	if { $attr == "dont_write_bytecode" \
		 && $exp_state == "off"
		 && [info exists ::env(PYTHONDONTWRITEBYTECODE)] } {
	    set answer "on"
	} else {
	    set answer $exp_state
	}

	gdb_test_multiline "testname" \
	    "python" "" \
	    "if hasattr(sys, 'flags') and getattr(sys.flags, '${attr}', False):" "" \
	    "  print (\"${attr} is on\")" "" \
	    "else:" "" \
	    "  print (\"${attr} is off\")" "" \
	    "end" "${attr} is ${answer}"
    }

    gdb_exit
}

save_vars { env(TERM) } {
    # We need an ANSI-capable terminal to get the output.
    setenv TERM ansi

    # Check the features are off by default.
    test_python_settings "off"

    # Create an empty directory we can use as HOME for some of the
    # tests below.  When we set XDG_CONFIG_HOME we still need to point
    # HOME at something otherwise GDB complains that it doesn't know
    # where to create the index cache.
    set empty_home_dir [standard_output_file fake-empty-home]

    # Create two directories to use for the style setting test.
    set dirs [setup_home_directories "style" \
		  [multi_line_input \
		       "set python dont-write-bytecode on" \
		       "set python ignore-environment on"]]
    set home_dir [lindex $dirs 0]
    set xdg_home_dir [lindex $dirs 1]

    # Now arrange to use the fake home directory early init file.
    save_vars { INTERNAL_GDBFLAGS env(HOME) env(XDG_CONFIG_HOME) } {
	set INTERNAL_GDBFLAGS [string map {"-nx" ""} $INTERNAL_GDBFLAGS]

	with_test_prefix "using HOME config" {
	    # Now test GDB when using the HOME directory.
	    set env(HOME) $home_dir
	    unset -nocomplain env(XDG_CONFIG_HOME)
	    test_python_settings "on"
	}

	with_test_prefix "using XDG_CONFIG_HOME config" {
	    # Now test using the XDG_CONFIG_HOME folder.  We still need to
	    # have a HOME directory set otherwise GDB will issue an error
	    # about not knowing where to place the index cache.
	    set env(XDG_CONFIG_HOME) $xdg_home_dir
	    set env(HOME) $empty_home_dir
	    test_python_settings "on"
	}
    }
}