Waybar/src/modules/custom.cpp

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#include "modules/custom.hpp"
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waybar::modules::Custom::Custom(std::string name, Json::Value config)
: ALabel(std::move(config)), name_(std::move(name))
{
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if (!config_["exec"]) {
throw std::runtime_error(name_ + " has no exec path.");
}
uint32_t interval = config_["interval"] ? config_["inveral"].asUInt() : 30;
thread_ = [this, interval] {
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bool can_update = true;
if (config_["exec-if"]) {
auto pid = fork();
int res = 0;
if (pid == 0) {
std::istringstream iss(config_["exec-if"].asString());
std::vector<char*> av;
for (std::string s; iss >> s;) {
// Need to copy otherwise values are the same
char *str = new char[s.size() + 1];
memcpy(str, s.c_str(), s.size() + 1);
av.push_back(str);
}
av.push_back(0);
execvp(av.front(), av.data());
_exit(127);
} else if (pid > 0 && waitpid(pid, &res, 0) != -1
&& WEXITSTATUS(res) != 0) {
can_update = false;
}
}
if (can_update) {
Glib::signal_idle().connect_once(sigc::mem_fun(*this, &Custom::update));
}
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thread_.sleep_for(chrono::seconds(interval));
};
}
auto waybar::modules::Custom::update() -> void
{
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std::array<char, 128> buffer = {0};
std::string output;
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std::shared_ptr<FILE> fp(popen(config_["exec"].asCString(), "r"), pclose);
if (!fp) {
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std::cerr << name_ + " can't exec " + config_["exec"].asString() << std::endl;
return;
}
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while (feof(fp.get()) == 0) {
if (fgets(buffer.data(), 128, fp.get()) != nullptr) {
output += buffer.data();
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}
}
// Remove last newline
if (!output.empty() && output[output.length()-1] == '\n') {
output.erase(output.length()-1);
}
// Hide label if output is empty
if (output.empty()) {
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label_.hide();
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label_.set_name("");
} else {
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label_.set_name("custom-" + name_);
auto format = config_["format"] ? config_["format"].asString() : "{}";
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auto str = fmt::format(format, output);
label_.set_text(str);
label_.set_tooltip_text(str);
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label_.show();
}
}