Code Style Skill | Agent Skills

Code Style

Description

Code style conventions for ikigai development.

Details

Comments

Use // style only (never /* ... */)
Comment why, not what
Use sparingly

Numeric Types

Always use <inttypes.h> for numeric types and format specifiers
Never use primitive types (int, long, etc.)
Use explicit sized types: int8_t, int16_t, int32_t, int64_t, uint8_t, etc.
Use size_t for sizes and counts
Use PRId32, PRIu64, etc. for printf format specifiers
Use SCNd32, SCNu64, etc. for scanf format specifiers

Example:

#include <inttypes.h>

int32_t count = 42;
uint64_t size = 1024;
printf("Count: %" PRId32 ", Size: %" PRIu64 "\n", count, size);

Include Order

Follow Google C++ style guide for #include ordering:

Own header first (e.g., config.h in config.c) - catches missing dependencies
Project headers ("header.h") - alphabetically sorted
System/library headers (<header.h>) - alphabetically sorted

Example:

#include "config.h"           // Own header

#include "json_allocator.h"   // Project headers (alphabetical)
#include "logger.h"
#include "panic.h"
#include "wrapper.h"

#include <errno.h>            // System headers (alphabetical)
#include <stdlib.h>
#include <string.h>

Rationale: Project headers before system headers catches non-self-contained headers early.

Avoid Static Functions

Do not use static helper functions in implementation files. Instead, inline the code directly.

Why: LCOV exclusion markers (LCOV_EXCL_BR_LINE) on PANIC/assert calls inside static functions are not reliably honored, breaking 90% branch coverage requirements.

Exception: MOCKABLE wrapper functions (see wrapper.h) - these use static functions by design for the mocking interface.

Instead of:

static yyjson_mut_val *build_param(yyjson_mut_doc *doc, const char *desc)
{
    yyjson_mut_val *p = yyjson_mut_obj(doc);
    if (p == NULL) PANIC("Out of memory"); // LCOV_EXCL_BR_LINE - NOT HONORED!
    return p;
}

Do:

// Inline the code at each call site
yyjson_mut_val *p = yyjson_mut_obj(doc);
if (p == NULL) PANIC("Out of memory"); // LCOV_EXCL_BR_LINE - works

Test Code Style

Always add a blank line between END_TEST and START_TEST.

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