cmake -E env: Add --modify flag

When `cmake -E env` is given the `--modify` flag, try to parse the
following argument as an `ENVIRONMENT_MODIFICATION` operation and apply
it to the environment.

This generalizes `--unset=`:

1.  When implementing `ENVIRONMENT_MODIFICATION` features for other CMake
    commands, the `MYVAR=OP:VALUE` strings do not need to be translated
    to OP-specific flags.
2.  This provides a natural and consistent extension point to introduce
    new operations without introducing very many flags.
3.  Users need to learn only one syntax to access the same functionality.

There is one difference between the behavior here as compared to CTest's
interpretation of the `ENVIRONMENT_MODIFICATION` test property.
The `MYVAR=reset:` command when run in `cmake -E env` will reset `MYVAR`
to whatever its value was when `cmake -E env` launched, rather than try
to checkpoint after plain `MYVAR=VALUE` options.  This makes `MYVAR=VALUE`
and `--modify MYVAR=set:VALUE` semantically equivalent.

1 files changed, 54 insertions, 0 deletions

diff --git a/Tests/RunCMake/CommandLine/RunCMakeTest.cmake b/Tests/RunCMake/CommandLine/RunCMakeTest.cmake
index 39d7858..7da0f8d 100644
--- a/Tests/RunCMake/CommandLine/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CommandLine/RunCMakeTest.cmake
@@ -744,6 +744,10 @@ run_cmake_command(E_cat-without-double-dash ${CMAKE_COMMAND} -E cat "-file-start
 unset(RunCMake_TEST_COMMAND_WORKING_DIRECTORY)
 unset(out)
 
+# Unset environment variables that are used for testing cmake -E
+unset(ENV{TEST_ENV})
+unset(ENV{TEST_ENV_EXPECTED})
+
 run_cmake_command(E_env-no-command0 ${CMAKE_COMMAND} -E env)
 run_cmake_command(E_env-no-command1 ${CMAKE_COMMAND} -E env TEST_ENV=1)
 run_cmake_command(E_env-bad-arg1 ${CMAKE_COMMAND} -E env -bad-arg1)
@@ -758,6 +762,56 @@ file(COPY_FILE "${EXIT_CODE_EXE}" "${RunCMake_BINARY_DIR}/env=${exit_code}")
 run_cmake_command(E_env-with-double-dash ${CMAKE_COMMAND} -E env TEST_ENV=1 -- "${RunCMake_BINARY_DIR}/env=${exit_code}" zero_exit)
 run_cmake_command(E_env-without-double-dash ${CMAKE_COMMAND} -E env TEST_ENV=1 "${RunCMake_BINARY_DIR}/env=${exit_code}" zero_exit)
 
+## Tests of env --modify
+# Repeat the same tests as above
+run_cmake_command(E_env_modify-set   ${CMAKE_COMMAND} -E env --modify TEST_ENV=set:1 ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/E_env-set.cmake)
+run_cmake_command(E_env_modify-unset ${CMAKE_COMMAND} -E env --modify TEST_ENV=set:1 ${CMAKE_COMMAND} -E env --modify TEST_ENV=unset: ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/E_env-unset.cmake)
+run_cmake_command(E_env_modify-with-double-dash ${CMAKE_COMMAND} -E env --modify TEST_ENV=set:1 -- "${RunCMake_BINARY_DIR}/env=${exit_code}" zero_exit)
+run_cmake_command(E_env_modify-without-double-dash ${CMAKE_COMMAND} -E env --modify TEST_ENV=set:1 "${RunCMake_BINARY_DIR}/env=${exit_code}" zero_exit)
+
+# Test environment modification commands
+run_cmake_command(E_env_modify-reset
+                  ${CMAKE_COMMAND} -E env TEST_ENV=expected
+                  ${CMAKE_COMMAND} -E env TEST_ENV_EXPECTED=expected TEST_ENV=bad_value --modify TEST_ENV=reset:
+                  ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/E_env-equal.cmake)
+
+run_cmake_command(E_env_modify-reset-to-unset
+                  ${CMAKE_COMMAND} -E env --unset=TEST_ENV --unset=TEST_ENV_EXPECTED
+                  ${CMAKE_COMMAND} -E env TEST_ENV=bad_value --modify TEST_ENV=reset:
+                  ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/E_env-equal.cmake)
+
+run_cmake_command(E_env_modify-string
+                  ${CMAKE_COMMAND} -E env TEST_ENV_EXPECTED=expected
+                  --modify TEST_ENV=unset:
+                  --modify TEST_ENV=string_append:ect
+                  --modify TEST_ENV=string_prepend:exp
+                  --modify TEST_ENV=string_append:ed
+                  ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/E_env-equal.cmake)
+
+if (WIN32)
+  set(SEP "\\;")
+else ()
+  set(SEP ":")
+endif ()
+
+run_cmake_command(E_env_modify-path_list
+                  ${CMAKE_COMMAND} -E env "TEST_ENV_EXPECTED=exp${SEP}ect${SEP}ed"
+                  --modify TEST_ENV=unset:
+                  --modify TEST_ENV=path_list_append:ect
+                  --modify TEST_ENV=path_list_prepend:exp
+                  --modify TEST_ENV=path_list_append:ed
+                  ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/E_env-equal.cmake)
+
+run_cmake_command(E_env_modify-cmake_list
+                  ${CMAKE_COMMAND} -E env "TEST_ENV_EXPECTED=exp\\;ect\\;ed"
+                  --modify TEST_ENV=unset:
+                  --modify TEST_ENV=cmake_list_append:ect
+                  --modify TEST_ENV=cmake_list_prepend:exp
+                  --modify TEST_ENV=cmake_list_append:ed
+                  ${CMAKE_COMMAND} -P ${RunCMake_SOURCE_DIR}/E_env-equal.cmake)
+
+run_cmake_command(E_env_modify-bad-operation ${CMAKE_COMMAND} -E env --modify TEST_ENV=unknown:)
+
 run_cmake_command(E_md5sum-dir ${CMAKE_COMMAND} -E md5sum .)
 run_cmake_command(E_sha1sum-dir ${CMAKE_COMMAND} -E sha1sum .)
 run_cmake_command(E_sha224sum-dir ${CMAKE_COMMAND} -E sha224sum .)