75eb41f5ad
If a config file is a directory, ifstream would just read it as an empty file without any errors. Failing early here is a good idea.
122 lines
2.5 KiB
C++
122 lines
2.5 KiB
C++
#pragma once
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#include <streambuf>
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#include "common.hpp"
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#include "utils/factory.hpp"
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POLYBAR_NS
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class file_ptr {
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public:
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explicit file_ptr(const string& path, const string& mode = "a+");
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~file_ptr();
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explicit operator bool();
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operator bool() const;
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explicit operator FILE*();
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operator FILE*() const;
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explicit operator int();
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operator int() const;
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private:
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FILE* m_ptr = nullptr;
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string m_path;
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string m_mode;
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};
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class file_descriptor {
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public:
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explicit file_descriptor(const string& path, int flags = 0);
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explicit file_descriptor(int fd, bool autoclose = true);
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~file_descriptor();
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file_descriptor& operator=(const int);
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explicit operator bool();
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operator bool() const;
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explicit operator int();
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operator int() const;
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protected:
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void close();
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private:
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int m_fd{-1};
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bool m_autoclose{true};
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};
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class fd_streambuf : public std::streambuf {
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public:
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using traits_type = std::streambuf::traits_type;
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template <typename... Args>
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explicit fd_streambuf(Args&&... args) : m_fd(forward<Args>(args)...) {
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setg(m_in, m_in, m_in);
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setp(m_out, m_out + bufsize - 1);
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}
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~fd_streambuf();
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explicit operator int();
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operator int() const;
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void open(int fd);
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void close();
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protected:
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int sync();
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int overflow(int c);
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int underflow();
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private:
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file_descriptor m_fd;
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enum { bufsize = 1024 };
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char m_out[bufsize];
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char m_in[bufsize - 1];
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};
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template <typename StreamType>
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class fd_stream : public StreamType {
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public:
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using type = fd_stream<StreamType>;
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template <typename... Args>
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explicit fd_stream(Args&&... args) : StreamType(nullptr), m_buf(forward<Args>(args)...) {
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StreamType::rdbuf(&m_buf);
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}
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explicit operator int() {
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return static_cast<const type&>(*this);
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}
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operator int() const {
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return m_buf;
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}
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protected:
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fd_streambuf m_buf;
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};
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namespace file_util {
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bool exists(const string& filename);
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bool is_file(const string& filename);
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string pick(const vector<string>& filenames);
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string contents(const string& filename);
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void write_contents(const string& filename, const string& contents);
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bool is_fifo(const string& filename);
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vector<string> glob(string pattern);
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const string expand(const string& path);
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string get_config_path();
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vector<string> list_files(const string& dirname);
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template <typename... Args>
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decltype(auto) make_file_descriptor(Args&&... args) {
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return factory_util::unique<file_descriptor>(forward<Args>(args)...);
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}
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} // namespace file_util
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POLYBAR_NS_END
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