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Add support for using text_style in format and vformat directly (#993)

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* Closes #993
This commit is contained in:
Denis Blank 2018-12-30 16:49:34 +01:00 committed by Victor Zverovich
parent 1b8a216ddf
commit ae1de3a8d3
2 changed files with 107 additions and 1 deletions
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74
include/fmt/color.h
View File

@ -452,6 +452,13 @@ struct ansi_color_escape {
}
FMT_CONSTEXPR operator const Char *() const FMT_NOEXCEPT { return buffer; }
FMT_CONSTEXPR const Char * begin() const FMT_NOEXCEPT {
return buffer;
}
FMT_CONSTEXPR const Char * end() const FMT_NOEXCEPT {
return buffer + std::strlen(buffer);
}
private:
Char buffer[7u + 3u * 4u + 1u];
@ -502,6 +509,13 @@ inline void reset_color<wchar_t>(FILE *stream) FMT_NOEXCEPT {
fputs(internal::data::WRESET_COLOR, stream);
}
template <typename Char>
inline void reset_color(basic_memory_buffer<Char>& buffer) FMT_NOEXCEPT {
const char* begin = data::RESET_COLOR;
const char* end = begin + sizeof(data::RESET_COLOR) - 1;
buffer.append(begin, end);
}
// The following specialiazation disables using std::FILE as a character type,
// which is needed because or else
// fmt::print(stderr, fmt::emphasis::bold, "");
@ -510,6 +524,37 @@ template <>
struct is_string<std::FILE *> : std::false_type {};
template <>
struct is_string<const std::FILE *> : std::false_type {};
template <typename Char>
std::basic_string<Char> vformat(
const text_style &ts, basic_string_view<Char> format_str,
basic_format_args<typename buffer_context<Char>::type> args) {
basic_memory_buffer<Char> buffer;
bool has_style = false;
if (ts.has_emphasis()) {
has_style = true;
ansi_color_escape<Char> escape =
make_emphasis<Char>(ts.get_emphasis());
buffer.append(escape.begin(), escape.end());
}
if (ts.has_foreground()) {
has_style = true;
ansi_color_escape<Char> escape =
make_foreground_color<Char>(ts.get_foreground());
buffer.append(escape.begin(), escape.end());
}
if (ts.has_background()) {
has_style = true;
ansi_color_escape<Char> escape =
make_background_color<Char>(ts.get_background());
buffer.append(escape.begin(), escape.end());
}
internal::vformat_to(buffer, format_str, args);
if (has_style) {
reset_color<Char>(buffer);
}
return fmt::to_string(buffer);
}
} // namespace internal
template <
@ -570,6 +615,35 @@ typename std::enable_if<internal::is_string<String>::value>::type print(
return print(stdout, ts, format_str, args...);
}
template <typename S, typename Char = FMT_CHAR(S)>
inline std::basic_string<Char> vformat(
const text_style &ts,
const S &format_str,
basic_format_args<typename buffer_context<Char>::type> args) {
return internal::vformat(ts, to_string_view(format_str), args);
}
/**
\rst
Formats arguments and returns the result as a string using ANSI
escape sequences to specify text formatting.
**Example**::
#include <fmt/color.h>
std::string message = fmt::format(fmt::emphasis::bold | fg(fmt::color::red),
"The answer is {}", 42);
\endrst
*/
template <typename S, typename... Args>
inline std::basic_string<FMT_CHAR(S)> format(
const text_style &ts, const S &format_str, const Args &... args) {
return internal::vformat(
ts, to_string_view(format_str),
*internal::checked_args<S, Args...>(format_str, args...));
}
#endif
FMT_END_NAMESPACE

34
test/format-impl-test.cc
View File

@ -206,7 +206,7 @@ TEST(FormatTest, CountCodePoints) {
EXPECT_EQ(4, fmt::internal::count_code_points(fmt::u8string_view("ёжик")));
}
TEST(ColorsTest, Colors) {
TEST(ColorsTest, ColorsPrint) {
EXPECT_WRITE(stdout, fmt::print(fg(fmt::rgb(255, 20, 30)), "rgb(255,20,30)"),
"\x1b[38;2;255;020;030mrgb(255,20,30)\x1b[0m");
EXPECT_WRITE(stdout, fmt::print(fg(fmt::color::blue), "blue"),
@ -244,3 +244,35 @@ TEST(ColorsTest, Colors) {
fmt::print(bg(fmt::terminal_color::bright_magenta), "tbmagenta"),
"\x1b[105mtbmagenta\x1b[0m");
}
TEST(ColorsTest, ColorsFormat) {
EXPECT_EQ(fmt::format(fg(fmt::rgb(255, 20, 30)), "rgb(255,20,30)"),
"\x1b[38;2;255;020;030mrgb(255,20,30)\x1b[0m");
EXPECT_EQ(fmt::format(fg(fmt::color::blue), "blue"),
"\x1b[38;2;000;000;255mblue\x1b[0m");
EXPECT_EQ(fmt::format(fg(fmt::color::blue) | bg(fmt::color::red), "two color"),
"\x1b[38;2;000;000;255m\x1b[48;2;255;000;000mtwo color\x1b[0m");
EXPECT_EQ(fmt::format(fmt::emphasis::bold, "bold"),
"\x1b[1mbold\x1b[0m");
EXPECT_EQ(fmt::format(fmt::emphasis::italic, "italic"),
"\x1b[3mitalic\x1b[0m");
EXPECT_EQ(fmt::format(fmt::emphasis::underline, "underline"),
"\x1b[4munderline\x1b[0m");
EXPECT_EQ(fmt::format(fmt::emphasis::strikethrough, "strikethrough"),
"\x1b[9mstrikethrough\x1b[0m");
EXPECT_EQ(fmt::format(fg(fmt::color::blue) | fmt::emphasis::bold, "blue/bold"),
"\x1b[1m\x1b[38;2;000;000;255mblue/bold\x1b[0m");
EXPECT_EQ(fmt::format(fmt::emphasis::bold, "bold error"),
"\x1b[1mbold error\x1b[0m");
EXPECT_EQ(fmt::format(fg(fmt::color::blue), "blue log"),
"\x1b[38;2;000;000;255mblue log\x1b[0m");
EXPECT_EQ(fmt::format(fmt::text_style(), "hi"), "hi");
EXPECT_EQ(fmt::format(fg(fmt::terminal_color::red), "tred"),
"\x1b[31mtred\x1b[0m");
EXPECT_EQ(fmt::format(bg(fmt::terminal_color::cyan), "tcyan"),
"\x1b[46mtcyan\x1b[0m");
EXPECT_EQ(fmt::format(fg(fmt::terminal_color::bright_green), "tbgreen"),
"\x1b[92mtbgreen\x1b[0m");
EXPECT_EQ(fmt::format(bg(fmt::terminal_color::bright_magenta), "tbmagenta"),
"\x1b[105mtbmagenta\x1b[0m");
}