progress.h
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progress.h
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	#ifndef PROGRESS_H
	#define PROGRESS_H

	#include <stdio.h>
	#include <stdbool.h>
	#include <stdint.h>
	#include <stdatomic.h>
	#include <stdlib.h>
	#include <string.h>
	#include <time.h>

	#ifdef _WIN32
	#define WIN32_LEAN_AND_MEAN
	#include <windows.h>
	#include <io.h>
	#define PROGRESS_ISATTY(fd) _isatty(fd)
	#define PROGRESS_FILENO(f) _fileno(f)
	#else
	#include <unistd.h>
	#include <sys/ioctl.h>
	#define PROGRESS_ISATTY(fd) isatty(fd)
	#define PROGRESS_FILENO(f) fileno(f)
	#endif

	#define PROGRESS_MSG_SIZE 256

	#ifdef __has_include
	#if __has_include(<pthread.h>)
	#include <pthread.h>
	#define PROGRESS_HAS_PTHREADS 1
	#endif
	#endif

	typedef struct {
	#if defined(PROGRESS_HAS_PTHREADS)
	pthread_mutex_t mtx;
	#elif defined(_WIN32)
	CRITICAL_SECTION cs;
	#else
	int dummy;
	#endif
	} progress_mutex_t;

	typedef struct {
	FILE *terminal;
	bool is_windows_terminal;
	bool supports_ansi;
	bool dont_print_on_dumb;
	uint64_t start_time_ns;
	uint64_t prev_refresh_ns;
	uint64_t refresh_rate_ns;
	uint64_t initial_delay_ns;
	bool done;
	bool timer_valid;
	size_t columns_written;
	progress_mutex_t mutex;
	char buffer[PROGRESS_MSG_SIZE];
	char msg_buffer[PROGRESS_MSG_SIZE];
	} progress_t;

	static inline void progress_mutex_init(progress_mutex_t *m) {
	#if defined(PROGRESS_HAS_PTHREADS)
	pthread_mutex_init(&m->mtx, NULL);
	#elif defined(_WIN32)
	InitializeCriticalSection(&m->cs);
	#else
	(void)m;
	#endif
	}

	static inline void progress_mutex_destroy(progress_mutex_t *m) {
	#if defined(PROGRESS_HAS_PTHREADS)
	pthread_mutex_destroy(&m->mtx);
	#elif defined(_WIN32)
	DeleteCriticalSection(&m->cs);
	#else
	(void)m;
	#endif
	}

	static inline void progress_mutex_lock(progress_mutex_t *m) {
	#if defined(PROGRESS_HAS_PTHREADS)
	pthread_mutex_lock(&m->mtx);
	#elif defined(_WIN32)
	EnterCriticalSection(&m->cs);
	#else
	(void)m;
	#endif
	}

	static inline void progress_mutex_unlock(progress_mutex_t *m) {
	#if defined(PROGRESS_HAS_PTHREADS)
	pthread_mutex_unlock(&m->mtx);
	#elif defined(_WIN32)
	LeaveCriticalSection(&m->cs);
	#else
	(void)m;
	#endif
	}

	static inline bool progress_mutex_trylock(progress_mutex_t *m) {
	#if defined(PROGRESS_HAS_PTHREADS)
	return pthread_mutex_trylock(&m->mtx) == 0;
	#elif defined(_WIN32)
	return TryEnterCriticalSection(&m->cs) != 0;
	#else
	(void)m;
	return true;
	#endif
	}

	static inline uint64_t progress_now_ns(void) {
	struct timespec ts;
	#if defined(CLOCK_MONOTONIC)
	if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
	return (uint64_t)ts.tv_sec * 1000000000ULL + (uint64_t)ts.tv_nsec;
	}
	#elif defined(_WIN32)
	static LARGE_INTEGER freq = {0};
	if (freq.QuadPart == 0) {
	QueryPerformanceFrequency(&freq);
	}
	LARGE_INTEGER counter;
	QueryPerformanceCounter(&counter);
	return (uint64_t)(counter.QuadPart * 1000000000ULL / freq.QuadPart);
	#endif
	if (clock_gettime(CLOCK_REALTIME, &ts) == 0) {
	return (uint64_t)ts.tv_sec * 1000000000ULL + (uint64_t)ts.tv_nsec;
	}
	return 0;
	}

	static inline bool progress_detect_ansi(FILE *f) {
	if (!f) return false;

	int fd = PROGRESS_FILENO(f);
	if (!PROGRESS_ISATTY(fd)) return false;

	#ifdef _WIN32
	HANDLE h = (HANDLE)_get_osfhandle(fd);
	DWORD mode;
	if (GetConsoleMode(h, &mode)) {
	if (SetConsoleMode(h, mode \| ENABLE_VIRTUAL_TERMINAL_PROCESSING)) return true;
	}
	const char *term = getenv("TERM");
	return (term && strstr(term, "xterm"))
	\|\| (term && strstr(term, "vt100"))
	\|\| (term && strstr(term, "color"))
	\|\| (term && strstr(term, "ansi"));
	#else
	const char *term = getenv("TERM");
	if (!term) return false;
	if (strcmp(term, "dumb") == 0) return false;
	return true;
	#endif
	}

	static void progress_refresh_locked(progress_t *p);
	static void progress_clear_locked(progress_t p, size_t end);

	static inline void progress_start(progress_t p, const char message) {
	memset(p, 0, sizeof(*p));
	progress_mutex_init(&p->mutex);

	FILE *f = stderr;
	int fd = PROGRESS_FILENO(f);

	if (PROGRESS_ISATTY(fd)) {
	p->terminal = f;
	p->supports_ansi = progress_detect_ansi(f);
	#ifdef _WIN32
	if (!p->supports_ansi) p->is_windows_terminal = true;
	#endif
	} else {
	p->terminal = f;
	p->supports_ansi = false;
	p->is_windows_terminal = false;
	}

	if (message) {
	strncpy(p->msg_buffer, message, PROGRESS_MSG_SIZE - 1);
	p->msg_buffer[PROGRESS_MSG_SIZE - 1] = '\0';
	} else p->msg_buffer[0] = '\0';

	p->refresh_rate_ns = 50 * 1000000ULL;
	p->initial_delay_ns = 500 * 1000000ULL;
	p->start_time_ns = progress_now_ns();
	p->prev_refresh_ns = 0;
	p->timer_valid = (p->start_time_ns != 0);

	p->columns_written = 0;
	p->done = false;

	progress_refresh_locked(p);
	}

	static inline void progress_maybe_refresh(progress_t *p) {
	if (!p->timer_valid) return;
	if (!progress_mutex_trylock(&p->mutex)) return;

	uint64_t now = progress_now_ns();
	uint64_t elapsed = now - p->start_time_ns;

	if (elapsed < p->initial_delay_ns) {
	progress_mutex_unlock(&p->mutex);
	return;
	}

	if (now < p->prev_refresh_ns \|\| (now - p->prev_refresh_ns) < p->refresh_rate_ns) {
	progress_mutex_unlock(&p->mutex);
	return;
	}

	progress_refresh_locked(p);
	progress_mutex_unlock(&p->mutex);
	}

	static inline void progress_update(progress_t p, const char message) {
	progress_mutex_lock(&p->mutex);
	if (message) {
	strncpy(p->msg_buffer, message, PROGRESS_MSG_SIZE - 1);
	p->msg_buffer[PROGRESS_MSG_SIZE - 1] = '\0';
	} else p->msg_buffer[0] = '\0';

	progress_mutex_unlock(&p->mutex);
	progress_maybe_refresh(p);
	}

	static inline void progress_refresh(progress_t *p) {
	if (!progress_mutex_trylock(&p->mutex)) return;
	progress_refresh_locked(p);
	progress_mutex_unlock(&p->mutex);
	}

	static void progress_clear_locked(progress_t p, size_t end) {
	if (!p->terminal) return;

	size_t pos = *end;

	if (p->columns_written > 0) {
	if (p->supports_ansi) {
	int written = snprintf(p->buffer + pos, sizeof(p->buffer) - pos, "\x1b[%zuD\x1b[0K", p->columns_written);
	if (written > 0) pos += (size_t)written;
	} else if (p->is_windows_terminal) {
	#ifdef _WIN32
	HANDLE h = (HANDLE)_get_osfhandle(PROGRESS_FILENO(p->terminal));
	CONSOLE_SCREEN_BUFFER_INFO info;
	if (GetConsoleScreenBufferInfo(h, &info)) {
	COORD cursor = {
	.X = (SHORT)(info.dwCursorPosition.X - (SHORT)p->columns_written),
	.Y = info.dwCursorPosition.Y
	};
	if (cursor.X < 0) cursor.X = 0;

	DWORD fill_len = (DWORD)(info.dwSize.X - cursor.X);
	DWORD written;
	FillConsoleOutputAttribute(h, info.wAttributes, fill_len, cursor, &written);
	FillConsoleOutputCharacterA(h, ' ', fill_len, cursor, &written);
	SetConsoleCursorPosition(h, cursor);
	}
	#endif
	} else {
	if (pos < sizeof(p->buffer)) p->buffer[pos++] = '\n';
	}
	p->columns_written = 0;
	}

	*end = pos;
	}

	static void progress_refresh_locked(progress_t *p) {
	bool is_dumb = !p->supports_ansi && !p->is_windows_terminal;
	if (is_dumb && p->dont_print_on_dumb) return;
	if (!p->terminal) return;

	size_t end = 0;
	progress_clear_locked(p, &end);

	if (!p->done) {
	if (p->msg_buffer[0]) {
	int written = snprintf(p->buffer + end, sizeof(p->buffer) - end, " %s", p->msg_buffer);
	if (written > 0) {
	size_t amt = (
	(size_t)written < sizeof(p->buffer) - end)
	? (size_t)written
	: sizeof(p->buffer) - end - 1;
	end += amt;
	p->columns_written = amt;
	}
	}
	}

	if (end > 0) {
	fwrite(p->buffer, 1, end, p->terminal);
	fflush(p->terminal);
	}

	p->prev_refresh_ns = progress_now_ns();
	}

	static inline void progress_stop(progress_t *p) {
	progress_mutex_lock(&p->mutex);
	p->done = true;

	size_t end = 0;
	progress_clear_locked(p, &end);
	if (end > 0 && p->terminal) {
	fwrite(p->buffer, 1, end, p->terminal);
	fflush(p->terminal);
	}

	progress_mutex_unlock(&p->mutex);
	progress_mutex_destroy(&p->mutex);
	}

	#endif

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