test/clang-tidy/checkers/modernize/use-std-format-custom.cpp

// RUN: %check_clang_tidy -check-suffixes=,STRICT                       \
// RUN:   -std=c++20 %s modernize-use-std-format %t --                  \
// RUN:   -config="{CheckOptions: {                                     \
// RUN:              modernize-use-std-format.StrictMode: true,         \
// RUN:              modernize-use-std-format.StrFormatLikeFunctions: '::strprintf; mynamespace::strprintf2; any_format_type_strprintf', \
// RUN:              modernize-use-std-format.ReplacementFormatFunction: 'fmt::format', \
// RUN:              modernize-use-std-format.FormatHeader: '<fmt/core.h>' \
// RUN:            }}"                                                  \
// RUN:   -- -isystem %clang_tidy_headers
// RUN: %check_clang_tidy -check-suffixes=,NOTSTRICT                    \
// RUN:   -std=c++20 %s modernize-use-std-format %t --                  \
// RUN:   -config="{CheckOptions: {                                     \
// RUN:              modernize-use-std-format.StrFormatLikeFunctions: '::strprintf; mynamespace::strprintf2; any_format_type_strprintf', \
// RUN:              modernize-use-std-format.ReplacementFormatFunction: 'fmt::format', \
// RUN:              modernize-use-std-format.FormatHeader: '<fmt/core.h>' \
// RUN:            }}"                                                  \
// RUN:   -- -isystem %clang_tidy_headers

#include <cstdio>
#include <string>
// CHECK-FIXES: #include <fmt/core.h>

std::string strprintf(const char *, ...);

namespace mynamespace {
  std::string strprintf2(const char *, ...);
}

std::string strprintf_test(const std::string &name, double value) {
  return strprintf("'%s'='%f'\n", name.c_str(), value);
  // CHECK-MESSAGES: [[@LINE-1]]:10: warning: use 'fmt::format' instead of 'strprintf' [modernize-use-std-format]
  // CHECK-FIXES: return fmt::format("'{}'='{:f}'\n", name, value);

  return mynamespace::strprintf2("'%s'='%f'\n", name.c_str(), value);
  // CHECK-MESSAGES: [[@LINE-1]]:10: warning: use 'fmt::format' instead of 'strprintf2' [modernize-use-std-format]
  // CHECK-FIXES: return fmt::format("'{}'='{:f}'\n", name, value);
}

std::string StrFormat_strict_conversion() {
  const unsigned char uc = 'A';
  return strprintf("Integer %hhd from unsigned char\n", uc);
  // CHECK-MESSAGES: [[@LINE-1]]:10: warning: use 'fmt::format' instead of 'strprintf' [modernize-use-std-format]
  // CHECK-FIXES-NOTSTRICT: return fmt::format("Integer {} from unsigned char\n", uc);
  // CHECK-FIXES-STRICT: return fmt::format("Integer {} from unsigned char\n", static_cast<signed char>(uc));
}

// Ensure that MatchesAnyListedNameMatcher::NameMatcher::match() can cope with a
// NamedDecl that has no name when we're trying to match unqualified_strprintf.
std::string A(const std::string &in)
{
    return "_" + in;
}

// Issue #92896: Ensure that the check doesn't assert if the argument is
// promoted to something that isn't a string.
struct S {
  S(...);
};
std::string any_format_type_strprintf(const S &, ...);

void unsupported_format_parameter_types()
{
  // No fixes here because the format parameter of the function called is not a
  // string.
  auto s1 = any_format_type_strprintf(L"");
  auto s2 = any_format_type_strprintf(42);

  // But if we do pass a character string then that ought to be acceptable.
  auto s3 = any_format_type_strprintf("Hello %s", "world");
  // CHECK-MESSAGES: [[@LINE-1]]:13: warning: use 'fmt::format' instead of 'any_format_type_strprintf' [modernize-use-std-format]
  // CHECK-FIXES: auto s3 = fmt::format("Hello {}", "world");
}