Add Tutorial

Scaffold a new tutorial example following Fluca conventions.

Required Input

Ask the user for:

1. •Module — tutorial subdirectory (e.g., fd)
2. •Description — what the tutorial demonstrates
3. •Dependencies — which fluca::* libraries to link

Steps

1. Determine next file number

ls fluca/tutorials/<module>/ex*.c

2. Generate source

#include <flucasys.h>
/* Module headers as needed */

static const char help[] = "<Description>\n"
                           "Options:\n"
                           "  -<opt> <type>  : <desc>\n";

int main(int argc, char **argv)
{
  /* Declarations at block top */

  PetscCall(FlucaInitialize(&argc, &argv, NULL, help));

  /* 1. Parse options
     2. Create DM(s)
     3. Create and configure objects
     4. Solve / compute
     5. Output results (ViewFromOptions or PetscPrintf)
     6. Destroy in reverse creation order */

  PetscCall(FlucaFinalize());
}

Tutorials differ from tests:

• •Use /*TEST*/ blocks with run-only semantics (exit code 0 = pass, no golden output files)
• •Parsed by fluca_parse_tutorial_file() in FlucaTestUtils.cmake, which calls RunTutorial.cmake
• •Typically longer, with comments explaining each step
• •Use SetFromOptions / ViewFromOptions for runtime configurability
• •May use PETSc solvers (SNES, KSP) as part of the example

3. Add /*TEST*/ block

Append a /*TEST ... TEST*/ block at the end of the source file to register tutorial cases with ctest:

/*TEST

  test:
    suffix: default
    nsize: 1

  test:
    suffix: high_peclet
    nsize: 1
    args: -gamma 0.01 -flucafd_limiter superbee

TEST*/

Each test: entry supports suffix (required), nsize (ignored), and args (optional). No output_file field — tutorials only check exit code.

4. Register in CMakeLists.txt

Add to TUTORIAL_SRCS in fluca/tutorials/<module>/CMakeLists.txt:

set(TUTORIAL_SRCS
    ex1.c
    ...
    ex<N>.c   # <-- add here
)

The fluca_parse_tutorial_file() call in the foreach loop automatically picks up the new file.

For a new module, also:

• •Create fluca/tutorials/<module>/CMakeLists.txt following the pattern (include FlucaTestUtils and call fluca_parse_tutorial_file)
• •Add add_subdirectory(<module>) to fluca/tutorials/CMakeLists.txt

5. Build and verify

cmake build                                    # Re-configure to pick up new TEST blocks
cmake --build build                            # Build
ctest --test-dir build -R "tutorials_<module>" # Run tutorial test cases

Checklist

• • Help string documents all custom options
• • Key steps have explanatory comments
• • /*TEST*/ block with at least one test case
• • Source added to TUTORIAL_SRCS in CMakeLists.txt
• • Builds and all tutorial test cases pass (exit code 0)