minecraft-pi-reborn/launcher/src/client/launcher.cpp

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#include <fstream>
#include <cstring>
#include <cerrno>
#include <sys/wait.h>
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#include <sys/stat.h>
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#include <vector>
#include <functional>
#include <libreborn/libreborn.h>
#include "../bootstrap.h"
// Load Available Feature Flags
static void load_available_feature_flags(std::function<void(std::string)> callback) {
// Get Path
char *binary_directory = get_binary_directory();
std::string path = std::string(binary_directory) + "/available-feature-flags";
free(binary_directory);
// Load File
std::ifstream stream(path);
if (stream && stream.good()) {
std::string line;
while (std::getline(stream, line)) {
if (line.length() > 0) {
// Verify Line
if (line.find('|') == std::string::npos) {
callback(line);
} else {
// Invalid Line
ERR("%s", "Feature Flag Contains Invalid '|'");
}
}
}
stream.close();
} else {
ERR("%s", "Unable To Load Available Feature Flags");
}
}
// Run Command And Get Output
static char *run_command(char *command[], int *return_code) {
// Store Output
int output_pipe[2];
safe_pipe2(output_pipe, 0);
// Run
pid_t ret = fork();
if (ret == -1) {
ERR("Unable To Run Command: %s", strerror(errno));
} else if (ret == 0) {
// Child Process
// Pipe stdout
dup2(output_pipe[1], STDOUT_FILENO);
close(output_pipe[0]);
close(output_pipe[1]);
// Run
safe_execvpe(command[0], command, environ);
} else {
// Parent Process
// Read stdout
close(output_pipe[1]);
char *output = NULL;
char c;
int bytes_read = 0;
while ((bytes_read = read(output_pipe[0], (void *) &c, 1)) > 0) {
string_append(&output, "%c", c);
}
close(output_pipe[0]);
// Get Return Code
int status;
waitpid(ret, &status, 0);
*return_code = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
// Return
return output;
}
}
// Run Command And Set Environmental Variable
static void run_command_and_set_env(const char *env_name, char *command[]) {
// Only Run If Environmental Variable Is NULL
if (getenv(env_name) == NULL) {
// Run
int return_code;
char *output = run_command(command, &return_code);
if (output != NULL) {
// Trim
int length = strlen(output);
if (output[length - 1] == '\n') {
output[length - 1] = '\0';
}
// Set
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set_and_print_env(env_name, output);
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}
// Check Return Code
if (return_code != 0) {
ERR("%s", "Launch Interrupted");
}
}
}
// Use Zenity To Set Environmental Variable
static void run_zenity_and_set_env(const char *env_name, std::vector<std::string> command) {
// Create Full Command
std::vector<std::string> full_command;
full_command.push_back("zenity");
full_command.push_back("--class");
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full_command.push_back("Minecraft: Pi Edition: Reborn");
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full_command.insert(full_command.end(), command.begin(), command.end());
// Convert To C Array
const char *full_command_array[full_command.size() + 1];
for (std::vector<std::string>::size_type i = 0; i < full_command.size(); i++) {
full_command_array[i] = full_command[i].c_str();
}
full_command_array[full_command.size()] = NULL;
// Run
run_command_and_set_env(env_name, (char **) full_command_array);
}
// Launch
int main(int argc, char *argv[]) {
// Print Features
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "--print-available-feature-flags") == 0) {
// Print Available Feature Flags
load_available_feature_flags([](std::string line) {
printf("%s\n", line.c_str());
fflush(stdout);
});
return 0;
}
}
// Create ~/.minecraft-pi If Needed
// Minecraft Folder
{
char *minecraft_folder = NULL;
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safe_asprintf(&minecraft_folder, "%s/.minecraft-pi", getenv("HOME"));
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{
// Check Minecraft Folder
struct stat obj;
if (stat(minecraft_folder, &obj) != 0 || !S_ISDIR(obj.st_mode)) {
// Create Minecraft Folder
int ret = mkdir(minecraft_folder, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
if (ret != 0) {
// Unable To Create Folder
ERR("Error Creating Directory: %s: %s", minecraft_folder, strerror(errno));
}
}
}
free(minecraft_folder);
}
// Setup MCPI_FEATURE_FLAGS
{
std::vector<std::string> command;
command.push_back("--list");
command.push_back("--checklist");
command.push_back("--width");
command.push_back("400");
command.push_back("--height");
command.push_back("400");
command.push_back("--column");
command.push_back("Enabled");
command.push_back("--column");
command.push_back("Feature");
load_available_feature_flags([&command](std::string line) {
if (line.rfind("TRUE ", 0) == 0) {
// Enabled By Default
command.push_back("TRUE");
command.push_back(line.substr(5, std::string::npos));
} else if (line.rfind("FALSE ", 0) == 0) {
// Disabled By Default
command.push_back("FALSE");
command.push_back(line.substr(6, std::string::npos));
} else {
ERR("%s", "Invalid Feature Flag Default");
}
});
// Run
run_zenity_and_set_env("MCPI_FEATURE_FLAGS", command);
}
// Setup MCPI_RENDER_DISTANCE
{
std::vector<std::string> command;
command.push_back("--list");
command.push_back("--radiolist");
command.push_back("--width");
command.push_back("400");
command.push_back("--height");
command.push_back("400");
command.push_back("--text");
command.push_back("Minecraft Render Distance:");
command.push_back("--column");
command.push_back("Selected");
command.push_back("--column");
command.push_back("Name");
command.push_back("FALSE");
command.push_back("Far");
command.push_back("FALSE");
command.push_back("Normal");
command.push_back("TRUE");
command.push_back("Short");
command.push_back("FALSE");
command.push_back("Tiny");
// Run
run_zenity_and_set_env("MCPI_RENDER_DISTANCE", command);
}
// Setup MCPI_USERNAME
{
std::vector<std::string> command;
command.push_back("--entry");
command.push_back("--text");
command.push_back("Minecraft Username:");
command.push_back("--entry-text");
command.push_back("StevePi");
// Run
run_zenity_and_set_env("MCPI_USERNAME", command);
}
// Bootstrap
bootstrap(argc, argv);
}