premiere-libtorrent/examples/print.cpp

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#ifdef _WIN32
#include <windows.h>
#include <conio.h>
#else
#include <unistd.h> // for close()
#include <fcntl.h> // for open()
#include <sys/ioctl.h>
#endif
#include "libtorrent/config.hpp"
#include "print.hpp"
#include <stdlib.h> // for atoi
#include <string.h> // for strlen
#include <cmath>
#include <algorithm> // for std::min
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#include <iterator> // for back_inserter
char const* esc(char const* code)
{
// this is a silly optimization
// to avoid copying of strings
enum { num_strings = 200 };
static char buf[num_strings][20];
static int round_robin = 0;
char* ret = buf[round_robin];
++round_robin;
if (round_robin >= num_strings) round_robin = 0;
ret[0] = '\033';
ret[1] = '[';
int i = 2;
int j = 0;
while (code[j]) ret[i++] = code[j++];
ret[i++] = 'm';
ret[i++] = 0;
return ret;
}
std::string to_string(int v, int width)
{
char buf[100];
snprintf(buf, sizeof(buf), "%*d", width, v);
return buf;
}
std::string add_suffix(float val, char const* suffix)
{
if (val < 0.001f)
{
std::string ret;
ret.resize(4 + 2, ' ');
if (suffix) ret.resize(4 + 2 + strlen(suffix), ' ');
return ret;
}
const char* prefix[] = {"kB", "MB", "GB", "TB", "PB"};
const int num_prefix = sizeof(prefix) / sizeof(const char*);
int i = 0;
for (; i < num_prefix - 1; ++i)
{
val /= 1000.f;
if (std::fabs(val) < 1000.f) break;
}
char ret[100];
snprintf(ret, sizeof(ret), "%4.*f%s%s", val < 99 ? 1 : 0, val, prefix[i], suffix ? suffix : "");
return ret;
}
std::string color(std::string const& s, color_code c)
{
if (c == col_none) return s;
char buf[1024];
snprintf(buf, sizeof(buf), "\x1b[3%dm%s\x1b[39m", c, s.c_str());
return buf;
}
std::string const& progress_bar(int progress, int width, color_code c
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, char fill, char bg, std::string caption, int flags)
{
static std::string bar;
bar.clear();
bar.reserve(size_t(width + 10));
int progress_chars = (progress * width + 500) / 1000;
if (caption.empty())
{
char code[10];
snprintf(code, sizeof(code), "\x1b[3%dm", c);
bar = code;
std::fill_n(std::back_inserter(bar), progress_chars, fill);
std::fill_n(std::back_inserter(bar), width - progress_chars, bg);
bar += esc("39");
}
else
{
// foreground color (depends a bit on background color)
color_code tc = col_black;
if (c == col_black || c == col_blue)
tc = col_white;
caption.resize(size_t(width), ' ');
char str[256];
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if (flags & progress_invert)
snprintf(str, sizeof(str), "\x1b[48;5;238m\x1b[37m%s\x1b[4%d;3%dm%s\x1b[49;39m"
, caption.substr(0, progress_chars).c_str(), c, tc
, caption.substr(progress_chars).c_str());
else
snprintf(str, sizeof(str), "\x1b[4%d;3%dm%s\x1b[48;5;238m\x1b[37m%s\x1b[49;39m"
, c, tc, caption.substr(0, progress_chars).c_str(), caption.substr(progress_chars).c_str());
bar = str;
}
return bar;
}
void set_cursor_pos(int x, int y)
{
#ifdef _WIN32
HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);
COORD c = {x, y};
SetConsoleCursorPosition(out, c);
#else
printf("\033[%d;%dH", y + 1, x + 1);
#endif
}
void clear_screen()
{
#ifdef _WIN32
HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);
COORD c = {0, 0};
CONSOLE_SCREEN_BUFFER_INFO si;
GetConsoleScreenBufferInfo(out, &si);
DWORD n;
FillConsoleOutputCharacter(out, ' ', si.dwSize.X * si.dwSize.Y, c, &n);
FillConsoleOutputAttribute(out, 0x7, si.dwSize.X * si.dwSize.Y, c, &n);
#else
printf("\033[2J");
#endif
}
void clear_rows(int y1, int y2)
{
if (y1 > y2) return;
#ifdef _WIN32
HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);
COORD c = {0, y1};
SetConsoleCursorPosition(out, c);
CONSOLE_SCREEN_BUFFER_INFO si;
GetConsoleScreenBufferInfo(out, &si);
DWORD n;
int num_chars = si.dwSize.X * (std::min)(si.dwSize.Y - y1, y2 - y1);
FillConsoleOutputCharacter(out, ' ', num_chars, c, &n);
FillConsoleOutputAttribute(out, 0x7, num_chars, c, &n);
#else
for (int i = y1; i < y2; ++i)
printf("\033[%d;1H\033[2K", i + 1);
#endif
}
void terminal_size(int* terminal_width, int* terminal_height)
{
#ifdef _WIN32
HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);
CONSOLE_SCREEN_BUFFER_INFO coninfo;
if (GetConsoleScreenBufferInfo(out, &coninfo))
{
*terminal_width = coninfo.dwSize.X;
*terminal_height = coninfo.srWindow.Bottom - coninfo.srWindow.Top;
#else
int tty = open("/dev/tty", O_RDONLY);
winsize size;
int ret = ioctl(tty, TIOCGWINSZ, reinterpret_cast<char*>(&size));
close(tty);
if (ret == 0)
{
*terminal_width = size.ws_col;
*terminal_height = size.ws_row;
#endif
if (*terminal_width < 64)
*terminal_width = 64;
if (*terminal_height < 25)
*terminal_height = 25;
}
else
{
*terminal_width = 190;
*terminal_height = 100;
}
}
#ifdef _WIN32
void apply_ansi_code(int* attributes, bool* reverse, int code)
{
static const int color_table[8] =
{
0, // black
FOREGROUND_RED, // red
FOREGROUND_GREEN, // green
FOREGROUND_RED | FOREGROUND_GREEN, // yellow
FOREGROUND_BLUE, // blue
FOREGROUND_RED | FOREGROUND_BLUE, // magenta
FOREGROUND_BLUE | FOREGROUND_GREEN, // cyan
FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE // white
};
enum
{
foreground_mask = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE,
background_mask = BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE
};
static const int fg_mask[2] = {foreground_mask, background_mask};
static const int bg_mask[2] = {background_mask, foreground_mask};
static const int fg_shift[2] = { 0, 4};
static const int bg_shift[2] = { 4, 0};
if (code == 0)
{
// reset
*attributes = color_table[7];
*reverse = false;
}
else if (code == 7)
{
if (*reverse) return;
*reverse = true;
int fg_col = *attributes & foreground_mask;
int bg_col = (*attributes & background_mask) >> 4;
*attributes &= ~(foreground_mask + background_mask);
*attributes |= fg_col << 4;
*attributes |= bg_col;
}
else if (code >= 30 && code <= 37)
{
// foreground color
*attributes &= ~fg_mask[*reverse];
*attributes |= color_table[code - 30] << fg_shift[*reverse];
}
else if (code >= 40 && code <= 47)
{
// foreground color
*attributes &= ~bg_mask[*reverse];
*attributes |= color_table[code - 40] << bg_shift[*reverse];
}
}
#endif
void print(char const* str)
{
#ifdef _WIN32
HANDLE out = GetStdHandle(STD_OUTPUT_HANDLE);
char buffer[4096];
char* buf = buffer;
strcpy(buf, str);
int current_attributes = 7;
bool reverse = false;
SetConsoleTextAttribute(out, current_attributes);
char* start = buf;
DWORD written;
while (*buf != 0)
{
if (*buf == '\033' && buf[1] == '[')
{
*buf = 0;
WriteFile(out, start, buf - start, &written, NULL);
buf += 2; // skip escape and '['
start = buf;
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if (*start == 'K')
{
// this means clear the rest of the line.
CONSOLE_SCREEN_BUFFER_INFO sbi;
if (GetConsoleScreenBufferInfo(out, &sbi))
{
COORD pos = sbi.dwCursorPosition;
int width = sbi.dwSize.X;
int run = width - pos.X;
DWORD n;
FillConsoleOutputAttribute(out, 0x7, run, pos, &n);
FillConsoleOutputCharacter(out, ' ', run, pos, &n);
}
++buf;
continue;
}
else if (*start == 'J')
{
// clear rest of screen
CONSOLE_SCREEN_BUFFER_INFO sbi;
if (GetConsoleScreenBufferInfo(out, &sbi))
{
COORD pos = sbi.dwCursorPosition;
int width = sbi.dwSize.X;
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int run = (width - pos.X) + width * (sbi.dwSize.Y - pos.Y - 1);
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DWORD n;
FillConsoleOutputAttribute(out, 0x7, run, pos, &n);
FillConsoleOutputCharacter(out, ' ', run, pos, &n);
}
++buf;
continue;
}
one_more:
while (*buf != 'm' && *buf != ';' && *buf != 0) ++buf;
if (*buf == 0) break;
int code = atoi(start);
apply_ansi_code(&current_attributes, &reverse, code);
if (*buf == ';')
{
++buf;
start = buf;
goto one_more;
}
SetConsoleTextAttribute(out, current_attributes);
++buf; // skip 'm'
start = buf;
}
else
{
++buf;
}
}
WriteFile(out, start, buf - start, &written, NULL);
#else
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fputs(str, stdout);
#endif
}