プログラマ専用SNS ミクプラ

コード:

~.exe > out.txt
~.exe

コード:

# tee.rb

require "open3"
STDOUT.sync = true

command = ARGV[0]
logfile = ARGV[1]

File.open(logfile, "w") do |f|
    Open3.popen3(command) do |stdin, stdout, stderr, wait_thr|
        Thread.new {
          while out = stdout.gets
            puts out
            f.write out
          end
        }.join
    end
end

コード:

$ ruby tee.rb "ping -c5 h2so5.net" log.txt
PING h2so5.net (219.94.244.34): 56 data bytes
64 bytes from 219.94.244.34: icmp_seq=0 ttl=53 time=70.489 ms
64 bytes from 219.94.244.34: icmp_seq=1 ttl=53 time=72.699 ms
64 bytes from 219.94.244.34: icmp_seq=2 ttl=53 time=69.637 ms
64 bytes from 219.94.244.34: icmp_seq=3 ttl=53 time=72.253 ms
64 bytes from 219.94.244.34: icmp_seq=4 ttl=53 time=72.961 ms

--- h2so5.net ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 69.637/71.608/72.961/1.309 ms

$ cat log.txt
PING h2so5.net (219.94.244.34): 56 data bytes
64 bytes from 219.94.244.34: icmp_seq=0 ttl=53 time=70.489 ms
64 bytes from 219.94.244.34: icmp_seq=1 ttl=53 time=72.699 ms
64 bytes from 219.94.244.34: icmp_seq=2 ttl=53 time=69.637 ms
64 bytes from 219.94.244.34: icmp_seq=3 ttl=53 time=72.253 ms
64 bytes from 219.94.244.34: icmp_seq=4 ttl=53 time=72.961 ms

--- h2so5.net ping statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 69.637/71.608/72.961/1.309 ms

コード:

// --- tee.h ---
#ifndef TEE_H
#define TEE_H

#include <iostream>
#include <fstream>
#include <string>

class Tee {
    std::ofstream ofs;
public:
    Tee();
    Tee& operator<<(const char *);
    Tee& operator<<(char);
    Tee& operator<<(int);
    Tee& operator<<(double);
    Tee& operator<<(std::string&);
    Tee& operator<<(std::ostream& (*)(std::ostream&));
    Tee& operator<<(std::ios_base& (*)(std::ios_base&));
};

namespace std {
    extern Tee tout;
}

#endif // TEE_H

コード:

// --- tee.cpp ---
#include "tee.h"

Tee::Tee() { ofs.open("log.txt"); }
Tee& Tee::operator<<(const char *s)
    { std::cout << s; ofs << s; return *this; }
Tee& Tee::operator<<(char c)
    { std::cout << c; ofs << c; return *this; }
Tee& Tee::operator<<(int i)
    { std::cout << i; ofs << i; return *this; }
Tee& Tee::operator<<(double d)
    { std::cout << d; ofs << d; return *this; }
Tee& Tee::operator<<(std::string& s)
    { std::cout << s; ofs << s; return *this; }
Tee& Tee::operator<<(std::ostream& (*f)(std::ostream&))
    { std::cout << f; ofs << f; return *this; }
Tee& Tee::operator<<(std::ios_base& (*f)(std::ios_base&))
    { std::cout << f; ofs << f; return *this; }

namespace std {
    Tee tout;
}

コード:

#include <iostream>

#include "tee.h"
#define cout tout

int main()
{
    std::string hello = "hello";
    std::cout << 3.14 << ' ' << std::hex << 127 << std::endl;
    std::cout << hello << ", world\n";
}