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//#define XERR
#include "builtin.ih"
// This function expects a string specifying an executable command as argument
// value. The command is executed by system(). The standard output produced by
// the call is returned as a list, one element per output line. If the list is
// empty the command has failed. A command not producing any output at least
// results in a list having one (empty) string.
void Builtin::backtick()
{
string const &cmd = d_stack[2].str(); // get the cmd
// prepare for its execution
Process process{ Process::COUT | Process::IGNORE_CERR,
Process::USE_SHELL, cmd };
if (d_echo)
cout << process.str() << endl;
process.start();
vector<string> lines;
string line;
while (getline(process, line))
{
xerr(line);
if (not process.eof())
line += '\n';
lines.push_back(move(line));
}
int ret = process.waitForChild();
xerr("exit: " << ret);
if (ret != 0)
lines.clear();
else if (lines.empty())
lines.push_back(string{});
d_reg = move(lines);
}
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