Cpp Include Sorter

C/C++ Include Sorter

Automatically sorts #include statements in C/C++ source files with intelligent handling of conditional compilation blocks.

Quick Start

Sort all .cpp files in a directory:

python scripts/sort_includes.py <directory-path>

Preview changes without modifying files:

python scripts/sort_includes.py <directory-path> --dry-run

Sorting Rules

Includes are organized into 3 categories with blank lines between each group:

1. Corresponding header - For file.cpp, file.h is placed first (prefers longest path if duplicates exist)
2. System headers - Headers with angle brackets <> (sorted alphabetically)
3. Local headers - Headers with double quotes "" (sorted alphabetically)

Conditional Compilation Blocks

#ifdef/#ifndef/#if defined blocks are treated as units:

• Blocks participate in global sorting based on their first include
• Headers inside each block are also sorted (system headers first, then local headers)
• Block structure (#ifdef...#endif) is preserved
• #elif and #else blocks are supported

Example

Before:

#include "common/rs_log.h"
#include "rs_trace.h"
#include <memory>
#ifdef RS_ENABLE_GPU
#include "feature/uifirst/rs_sub_thread_manager.h"
#include "feature/capture/rs_ui_capture_task_parallel.h"
#endif
#include "platform/common/rs_system_properties.h"

After:

#include "rs_trace.h"        // 1. Corresponding header (longest path preferred)

#include <memory>             // 2. System headers (alphabetical)

#include "common/rs_log.h"    // 3. Local headers (alphabetical)
#ifdef RS_ENABLE_GPU
#include "feature/capture/rs_ui_capture_task_parallel.h"
#include "feature/uifirst/rs_sub_thread_manager.h"
#endif
#include "platform/common/rs_system_properties.h"

Features

• Duplicate include handling: When multiple includes with same filename but different paths exist (e.g., "file.h" and "path/to/file.h"), the longest path is used as the corresponding header and placed first
• Comment preservation: Inline comments (// comment) and preceding comments are preserved
• Nested conditional blocks: Handles #elif and #else within #ifdef blocks
• Validation: Verifies no headers are lost during sorting

Script Reference

See scripts/sort_includes.py for implementation details.

Key functions:

• extract_includes_with_ifdef() - Parses includes and conditional blocks
• sort_includes_with_ifdef() - Sorts with 3-category rule
• format_ifdef_block() - Formats conditional blocks with sorted includes

Verification

After sorting, verify:

1. All #ifdef blocks contain same number of headers as before
2. Corresponding header has complete path (not shortened)
3. Total include count unchanged
4. Comments preserved

Use git diff to compare before/after:

git diff <file.cpp> | grep "^[-+]" | grep "include"