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//
// Created by Alan Freitas on 26/08/20.
//
#include "gnuplot.h"
#ifdef CXX_FILESYSTEM_IS_EXPERIMENTAL
#include <experimental/filesystem>
#else
#include <filesystem>
#endif
#include <iostream>
#include <matplot/util/common.h>
#include <matplot/util/popen.h>
#include <regex>
#include <thread>
#include <cstdlib>
#ifdef MATPLOT_HAS_FBUFSIZE
#include <stdio_ext.h>
static size_t gnuplot_pipe_capacity(FILE *f) {
size_t sz = __fbufsize(f);
return sz != 0 ? sz : matplot::backend::gnuplot::pipe_capacity_worst_case;
}
#else
static size_t gnuplot_pipe_capacity(FILE *) {
return matplot::backend::gnuplot::pipe_capacity_worst_case;
}
#endif // MATPLOT_HAS_FBUFSIZE
namespace matplot::backend {
bool gnuplot::consumes_gnuplot_commands() { return true; }
gnuplot::gnuplot() {
// 1st option: terminal in GNUTERM environment variable
#if defined(_MSC_VER) || \
defined(__CYGWIN__)
char *environment_terminal;
size_t len;
errno_t err = _dupenv_s(&environment_terminal, &len, "GNUTERM");
const bool env_found = err == 0 && environment_terminal != nullptr;
#else
char *environment_terminal = std::getenv("GNUTERM");
bool env_found = environment_terminal != nullptr;
#endif
if (env_found) {
if (terminal_is_available(environment_terminal)) {
terminal_ = environment_terminal;
}
#if defined(_WIN32) || defined(_WIN64) || defined(__MINGW32__) || defined(__CYGWIN__)
} else if (terminal_is_available("wxt")) {
// 2nd option: wxt on windows, even if not default
terminal_ = "wxt";
#endif
} else if (terminal_is_available("qt")) {
// 3rd option: qt
terminal_ = "qt";
} else {
// 4rd option: default terminal type
terminal_ = default_terminal_type();
}
// Open the gnuplot pipe_
if constexpr (windows_should_persist_by_default) {
pipe_ = POPEN("gnuplot --persist", "w");
} else {
pipe_ = POPEN("gnuplot", "w");
}
// Check if everything is OK
if (!pipe_) {
std::cerr << "Opening the gnuplot pipe_ failed!" << std::endl;
std::cerr
<< "Please install gnuplot 5.2.6+: http://www.gnuplot.info"
<< std::endl;
}
}
gnuplot::~gnuplot() {
if constexpr (dont_let_it_close_too_fast) {
auto time_since_last_flush =
std::chrono::high_resolution_clock::now() - last_flush_;
if (time_since_last_flush < std::chrono::seconds(5)) {
std::this_thread::sleep_for(std::chrono::seconds(5) -
time_since_last_flush);
}
}
flush_commands();
run_command("exit");
flush_commands();
if (pipe_) {
PCLOSE(pipe_);
}
}
bool gnuplot::is_interactive() { return output_.empty(); }
const std::string &gnuplot::output() { return output_; }
const std::string &gnuplot::output_format() { return terminal_; }
#ifdef STRING_VIEW_CONSTEXPR_BUG
#define SV_CONSTEXPR
#else
#define SV_CONSTEXPR constexpr
#endif
bool gnuplot::output(const std::string &filename) {
if (filename.empty()) {
output_ = filename;
terminal_ = default_terminal_type();
return true;
}
// look at the extension
#ifdef CXX_FILESYSTEM_IS_EXPERIMENTAL
namespace fs = std::experimental::filesystem;
#else
namespace fs = std::filesystem;
#endif
fs::path p{filename};
std::string ext = p.extension().string();
// check terminal for that extension
SV_CONSTEXPR auto exts = extension_terminal();
auto it = std::find_if(exts.begin(), exts.end(),
[&](const auto &e) { return e.first == ext; });
// if there is a terminal
if (it != exts.end()) {
// terminal name is the file format
output(filename, std::string(it->second));
return true;
} else {
// set file format to dumb
std::cerr << "No gnuplot terminal for " << ext << " files"
<< std::endl;
std::cerr << "Setting terminal to \"dumb\"" << std::endl;
output(filename, "dumb");
return false;
}
}
bool gnuplot::output(const std::string &filename,
const std::string &format) {
// If filename is empty - format should be interactive
// We don't check extension_terminal because that's only
// for non-interactive terminal
if (filename.empty()) {
output_ = filename;
terminal_ = format;
return true;
}
// Check if file format is valid
SV_CONSTEXPR auto exts = extension_terminal();
auto it = std::find_if(exts.begin(), exts.end(), [&](const auto &e) {
return e.second == format;
});
if (it == exts.end()) {
std::cerr << format << " format does not exist for gnuplot backend"
<< std::endl;
return false;
}
// Create file if it does not exist
#ifdef CXX_FILESYSTEM_IS_EXPERIMENTAL
namespace fs = std::experimental::filesystem;
#else
namespace fs = std::filesystem;
#endif
fs::path p{filename};
if (!p.parent_path().empty() && !fs::exists(p.parent_path())) {
fs::create_directory(p.parent_path());
if (!fs::exists(p.parent_path())) {
std::cerr << "Could not find or create " << p.parent_path()
<< std::endl;
return false;
}
}
output_ = filename;
terminal_ = format;
// Append extension if needed
std::string ext = p.extension().string();
if (ext.empty()) {
output_ += it->first;
}
return true;
}
unsigned int gnuplot::width() { return position_[2]; }
unsigned int gnuplot::height() { return position_[3]; }
void gnuplot::width(unsigned int new_width) {
position_[2] = new_width;
if (terminal_has_position_option(terminal_)) {
run_command("set terminal " + terminal_ + " position " +
num2str(position_[0]) + "," + num2str(position_[1]));
}
if (terminal_has_size_option(terminal_)) {
run_command("set terminal " + terminal_ + " size " +
num2str(position_[2]) + "," + num2str(position_[3]));
}
}
void gnuplot::height(unsigned int new_height) {
position_[3] = new_height;
if (terminal_has_position_option(terminal_)) {
run_command("set terminal " + terminal_ + " position " +
num2str(position_[0]) + "," + num2str(position_[1]));
}
if (terminal_has_size_option(terminal_)) {
run_command("set terminal " + terminal_ + " size " +
num2str(position_[2]) + "," + num2str(position_[3]));
}
}
unsigned int gnuplot::position_x() { return position_[0]; }
unsigned int gnuplot::position_y() { return position_[1]; }
void gnuplot::position_x(unsigned int new_position_x) {
position_[0] = new_position_x;
if (terminal_has_position_option(terminal_)) {
run_command("set terminal " + terminal_ + " position " +
num2str(position_[0]) + "," + num2str(position_[1]));
}
if (terminal_has_size_option(terminal_)) {
run_command("set terminal " + terminal_ + " size " +
num2str(position_[2]) + "," + num2str(position_[3]));
}
}
void gnuplot::position_y(unsigned int new_position_y) {
position_[1] = new_position_y;
if (terminal_has_position_option(terminal_)) {
run_command("set terminal " + terminal_ + " position " +
num2str(position_[0]) + "," + num2str(position_[1]));
}
if (terminal_has_size_option(terminal_)) {
run_command("set terminal " + terminal_ + " size " +
num2str(position_[2]) + "," + num2str(position_[3]));
}
}
bool gnuplot::new_frame() {
// always accept starting a new frame
return true;
}
bool gnuplot::render_data() { return flush_commands(); }
bool gnuplot::flush_commands() {
if constexpr (dont_let_it_close_too_fast) {
last_flush_ = std::chrono::high_resolution_clock::now();
}
fputs("\n", pipe_);
fflush(pipe_);
if constexpr (trace_commands) {
std::cout << "\n\n\n\n" << std::endl;
}
return true;
}
bool gnuplot::supports_fonts() {
return terminal_has_font_option(terminal_);
}
void gnuplot::run_command(const std::string &command) {
if (!pipe_) {
return;
}
size_t pipe_capacity = gnuplot_pipe_capacity(pipe_);
if (command.size() + bytes_in_pipe_ > pipe_capacity) {
flush_commands();
bytes_in_pipe_ = 0;
}
if (!command.empty()) {
fputs(command.c_str(), pipe_);
}
// fputs("; ", pipe_);
fputs("\n", pipe_);
bytes_in_pipe_ += command.size();
if constexpr (trace_commands) {
std::cout << command << std::endl;
}
}
void gnuplot::include_comment(const std::string &comment) {
if (include_comments_) {
run_command("# " + comment);
}
}
std::string gnuplot::default_terminal_type() {
static std::string terminal_type;
const bool dont_know_term_type = terminal_type.empty();
if (dont_know_term_type) {
terminal_type =
run_and_get_output("gnuplot -e \"show terminal\" 2>&1");
terminal_type = std::regex_replace(
terminal_type, std::regex("[^]*terminal type is ([^ ]+)[^]*"),
"$1");
const bool still_dont_know_term_type = terminal_type.empty();
if (still_dont_know_term_type) {
terminal_type = "qt";
}
}
return terminal_type;
}
bool gnuplot::terminal_is_available(std::string_view term) {
std::string msg = run_and_get_output("gnuplot -e \"set terminal " + std::string(term.data()) + "\" 2>&1");
return msg.empty();
}
std::tuple<int, int, int> gnuplot::gnuplot_version() {
static std::tuple<int, int, int> version{0, 0, 0};
const bool dont_know_gnuplot_version_yet =
version == std::tuple<int, int, int>({0, 0, 0});
if (dont_know_gnuplot_version_yet) {
std::string version_str =
run_and_get_output("gnuplot --version 2>&1");
std::string version_major = std::regex_replace(
version_str,
std::regex("[^]*gnuplot (\\d+)\\.\\d+ patchlevel \\d+ *"),
"$1");
std::string version_minor = std::regex_replace(
version_str,
std::regex("[^]*gnuplot \\d+\\.(\\d+) patchlevel \\d+ *"),
"$1");
std::string version_patch = std::regex_replace(
version_str,
std::regex("[^]*gnuplot \\d+\\.\\d+ patchlevel (\\d+) *"),
"$1");
try {
std::get<0>(version) = std::stoi(version_major);
} catch (...) {
std::get<0>(version) = 0;
}
try {
std::get<1>(version) = std::stoi(version_minor);
} catch (...) {
std::get<1>(version) = 0;
}
try {
std::get<2>(version) = std::stoi(version_patch);
} catch (...) {
std::get<2>(version) = 0;
}
const bool still_dont_know_gnuplot_version =
version == std::tuple<int, int, int>({0, 0, 0});
if (still_dont_know_gnuplot_version) {
// assume it's 5.2.6 by convention
version = std::tuple<int, int, int>({5, 2, 6});
}
}
return version;
}
bool gnuplot::terminal_has_title_option(const std::string &t) {
SV_CONSTEXPR std::string_view whitelist[] = {
"qt", "aqua", "caca", "canvas", "windows", "wxt", "x11"};
return std::find(std::begin(whitelist), std::end(whitelist), t) !=
std::end(whitelist);
}
bool gnuplot::terminal_has_size_option(const std::string &t) {
// Terminals that have the size option *in the way we expect it to work*
// This includes only the size option with {width, height} and not
// the size option for cropping or scaling
SV_CONSTEXPR std::string_view whitelist[] = {
"qt", "aqua", "caca", "canvas", "eepic",
"emf", "gif", "jpeg", "pbm", "png",
"sixelgd", "tkcanvas", "windows", "wxt", "svg"};
return std::find(std::begin(whitelist), std::end(whitelist), t) !=
std::end(whitelist);
}
bool gnuplot::terminal_has_position_option(const std::string &t) {
SV_CONSTEXPR std::string_view whitelist[] = {"qt", "windows", "wxt"};
return std::find(std::begin(whitelist), std::end(whitelist), t) !=
std::end(whitelist);
}
bool gnuplot::terminal_has_enhanced_option(const std::string &t) {
SV_CONSTEXPR std::string_view whitelist[] = {
"canvas", "postscript", "qt", "aqua", "caca",
"canvas", "dumb", "emf", "enhanced", "jpeg",
"pdf", "pdfcairo", "pm", "png", "pngcairo",
"postscript", "sixelgd", "tkcanvas", "windows", "wxt",
"x11", "ext", "wxt"};
return std::find(std::begin(whitelist), std::end(whitelist), t) !=
std::end(whitelist);
}
bool gnuplot::terminal_has_color_option(const std::string &t) {
SV_CONSTEXPR std::string_view whitelist[] = {
"postscript", "aifm", "caca", "cairolatex", "context",
"corel", "eepic", "emf", "epscairo", "epslatex",
"fig", "lua tikz", "mif", "mp", "pbm",
"pdf", "pdfcairo", "pngcairo", "postscript", "pslatex",
"pstex", "tgif", "windows"};
return std::find(std::begin(whitelist), std::end(whitelist), t) !=
std::end(whitelist);
}
bool gnuplot::terminal_has_font_option(const std::string &t) {
// This includes terminals that don't have the font option
// and terminals for which we want to use only the default fonts
// We prefer a blacklist because it's better to get a warning
// in a false positive than remove the fonts in a false negative.
SV_CONSTEXPR std::string_view blacklist[] = {
"dxf", "eepic", "emtex", "hpgl", "latex",
"mf", "pcl5", "pslatex", "pstex", "pstricks",
"qms", "tek40xx", "tek410x", "texdraw", "tkcanvas",
"vttek", "xterm", "jpeg", "dumb", "tpic",
"sixelgd", "png", "lua", "jpeg", "epscairo",
"epslatex", "canvas", "dumb", "dxy800a", "emxvga",
"pdfcairo", "cgi", "gif", "gpic", "grass",
"hp2623a", "hp2648", "hp500c", "hpgl", "pcl5",
"hpljii", "hppj", "imagen", "linux", "lua",
"lua tikz", "mf", "mif", "mp", "pbm",
"pm", "qms", "regis", "svga", "texdraw",
"tikz", "tpic", "vgagl", "vws", "pdf"};
return std::find(std::begin(blacklist), std::end(blacklist), t) ==
std::end(blacklist);
}
} // namespace matplot::backend
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