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Buffer lines prior to output.

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This commit is contained in:
Thomas Harte 2025-03-07 23:25:22 -05:00
parent 8caa1a9664
commit 93078abe87
1 changed files with 35 additions and 18 deletions
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53
Outputs/Log.hpp
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@ -10,6 +10,7 @@
#include <cstdio>
#include <cstdarg>
#include <string>
namespace Log {
// TODO: if adopting C++20, std::format would be a better model to apply below.
@ -88,7 +89,7 @@ constexpr bool is_enabled(const Source source) {
}
}
constexpr const char *prefix(Source source) {
constexpr const char *prefix(const Source source) {
switch(source) {
default: return nullptr;
@ -142,36 +143,52 @@ class Logger {
public:
static constexpr bool enabled = is_enabled(source);
struct LogLine {
public:
LogLine(FILE *const stream) : stream_(stream) {
if constexpr (!enabled) return;
template <bool enabled>
struct LogLine;
template <>
struct LogLine<true> {
public:
explicit LogLine(FILE *const stream) noexcept : stream_(stream) {
const auto source_prefix = prefix(source);
if(source_prefix) {
fprintf(stream_, "[%s] ", source_prefix);
}
if(!source_prefix) return;
output_.resize(strlen(source_prefix) + 4);
std::snprintf(output_.data(), output_.size(), "[%s] ", source_prefix);
output_.pop_back();
}
~LogLine() {
if constexpr (!enabled) return;
fprintf(stream_, "\n");
fprintf(stream_, "%s\n", output_.c_str());
}
void append(const char *const format, ...) {
if constexpr (!enabled) return;
va_list args;
va_start(args, format);
vfprintf(stream_, format, args);
va_end(args);
template <size_t size, typename... Args>
void append(const char (&format)[size], Args... args) {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat"
const auto append_size = std::snprintf(nullptr, 0, format, args...);
const auto end = output_.size();
output_.resize(output_.size() + size_t(append_size) + 1);
std::snprintf(output_.data() + end, size_t(append_size) + 1, format, args...);
output_.pop_back();
#pragma GCC diagnostic pop
}
private:
std::string output_;
FILE *stream_;
};
LogLine info() { return LogLine(stdout); }
LogLine error() { return LogLine(stderr); }
template <>
struct LogLine<false> {
explicit LogLine(FILE *) noexcept {}
template <size_t size, typename... Args>
void append(const char (&)[size], Args...) {}
};
LogLine<enabled> info() { return LogLine<enabled>(stdout); }
LogLine<enabled> error() { return LogLine<enabled>(stderr); }
};
}