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#
# Set environment variables and execute a program.
# Attempts to emulate "cmake -E env" which is only available since CMake 3.1.
#
# Copyright 2018 Peter Wu <peter@lekensteyn.nl>
# SPDX-License-Identifier: MIT
#
# Usage:
#
# cmake -P env.cmake [NAME=VALUE]... [COMMAND [ARG]...]
#
# Limitations due to CMake:
#
# - The command and arguments cannot be keywords for the "execute_process"
# command ("COMMAND", "ENCODING", "TIMEOUT", "WORKING_DIRECTORY", etc.).
# - Empty arguments are ignored, arguments with a trailing backslash ("\") will
# have the slash replaced by a forward slash ("/").
# - If a program fails, a message will be printed and exit code 1 is returned.
# Choose between two evils for the command line limitations:
# (1) Hard-coded number of maximum arguments and repetitive lines.
# (2) Limitations on the arguments (due to use of lists).
# (3) A combination of both.
# For simplicity, (2) is chosen here.
set(command)
math(EXPR argsCount "${CMAKE_ARGC} - 1")
set(skip_args ${argsCount})
set(maybe_env TRUE)
foreach(argNumber RANGE ${argsCount})
set(arg "${CMAKE_ARGV${argNumber}}")
if(skip_args EQUAL 0)
# Escape ";" (list separator) to avoid splitting arguments.
string(REPLACE ";" "\\;" argForList "${arg}")
# Prevent a trailing backslash from escaping the next list separator.
# Hopefully it is just a path separator, otherwise there will be problems.
if(argForList MATCHES "(.*)\\\\$")
message(WARNING "Trailing backslash is converted to forward slash in: ${arg}")
set(argForList "${CMAKE_MATCH_1}/")
endif()
if(argForList STREQUAL "")
message(WARNING "Empty arguments are currently not supported and ignored")
endif()
if(maybe_env)
# Try to parse NAME=VALUE
if(arg MATCHES "^([^=]+)=(.*)$")
set("ENV{${CMAKE_MATCH_1}}" "${CMAKE_MATCH_2}")
else()
set(maybe_env FALSE)
list(APPEND command "${argForList}")
endif()
else()
# Definitely no more env vars.
list(APPEND command "${argForList}")
endif()
else()
# Skip arguments until "-P env.cmake" is found.
if(arg STREQUAL "-P")
# just skip "env.cmake" from now on
set(skip_args 1)
else()
math(EXPR skip_args "${skip_args} - 1")
endif()
endif()
endforeach()
execute_process(COMMAND ${command} RESULT_VARIABLE exitCode)
if(NOT exitCode EQUAL 0)
message(FATAL_ERROR "Process exited with ${exitCode}")
endif()
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