Fixed issue where `scryer-prolog -t halt` would try to load "halt.pl"
as a file instead of just using halt as the custom toplevel.
The bug was caused by an extra clause `delegate_task([], []).` that
would return control to the calling context instead of continuing to
start_toplevel. This caused the argument processing in delegate_task
to continue and treat the already-consumed toplevel argument as a
filename.
Removing this clause ensures that delegate_task([], Goals0) always
proceeds to load initialization files and start the toplevel, fixing
the double-processing bug.
Co-Authored-By: J.J.'s Robot <jjtolton@gmail.com>
- Create Prolog integration tests in src/tests/custom_toplevel.pl
- Add CLI test configuration in tests/scryer/cli/src_tests/custom_toplevel_tests.toml
- Tests verify:
* -t halt terminates after initialization
* Custom toplevels can be user-defined predicates
* Toplevel receives control after initialization completes
* Default behavior is REPL when no -t specified
- All tests pass successfully
Following TESTING_GUIDE.md three-layer testing approach:
- Layer 2: Prolog integration tests with test_framework
- Layer 3: CLI snapshot tests with .toml configuration
Co-Authored-By: J.J.'s Robot <noreply@example.com>
- Add -t FLAG to specify custom toplevel (arity 0 predicate)
- Default toplevel is 'repl' if -t is not specified
- Using `-t halt` achieves original goal of guaranteed termination
- Custom toplevels enable flexible exit strategies (e.g., server mode)
- Update help text to document -t flag
Examples:
scryer-prolog -t halt program.pl # Exits after execution
scryer-prolog -t my_repl program.pl # Custom REPL
scryer-prolog program.pl # Default REPL
Co-Authored-By: J.J.'s Robot <noreply@example.com>
CI / build-test (--no-default-features, ubuntu-22.04, true, nightly, wasm32-unknown-unknown, --no-run --no-default-features, true) (push) Has been cancelled
deref register to access stack variable for `directory_exists/1`
deref register to access stack variable for `directory_files/2`
deref register to access stack variable for `delete_directory/1`
deref register to access stack variable for `delete_file/1`
deref registers to access stack variable for `file_copy/2`
deref register to access stack variable for `file_exists/1`
deref register to access stack variable for `file_size/2`
deref register to access stack variable from `file_time` function
deref register to access stack variable for `make_directory/1`
deref register to access stack variable for `make_directory_path/1`
deref register to access stack variable for `path_canonical/2`
deref registers to access stack variables for `rename_file/2`
Signed-off-by: Thierry Marianne <thierry@marianne.io>
reproduce failing `directory_exists/1` with working directory passed as first argument
reproduce failing `delete_directory/1` with ./test directory passed as first argument
reproduce failing `file_size/1` with 2 bytes files passed as first argument
reproduce failing `file_exists/1` with existing file passed as first argument
reproduce failing `file_modification_time/1`, `file_access_time/1` and `file_creation_time/1` with existing file passed as first argument
reproduce failing `directory_files/2` with existing directory passed as first argument
reproduce failing `delete_file/1` with existing file passed as first argument
reproduce failing `make_directory/1` with non-existing directory passed as first argument
reproduce failing `make_directory_path/1` with non-existing path passed as first argument
reproduce failing `path_canonical/2` with non-canonical path passed as first argument
reproduce failing `rename_file/2` with existing file passed as first argument, target file as second arg
revised `directory_exists/1` test case
renamed test files, test directories
use `path_segments/2`, remove path separators
do not write file size to current output
revised `directory_files/2` test
revised `path_canonical/2` test
revised `file_exists/1` test
removed hardcoded expected size
extracted hardcoded directory argument
remove path prefix containing path separator
revised expected ls cmd exit code so that it is platform-agnostic
Signed-off-by: Thierry Marianne <thierry@marianne.io>
