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// file : libbuild2/functions-process.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <libbutl/regex.mxx>
#include <libbuild2/function.hxx>
#include <libbuild2/variable.hxx>
using namespace std;
using namespace butl;
namespace build2
{
// Ideas for potential further improvements:
//
// - Use scope to query environment.
// - Mode to ignore error/suppress diagnostics and return NULL?
// - Similar regex flags to regex.* functions (icase, etc)?
// Process arguments.
//
static pair<process_path, strings>
process_args (names&& args, const char* fn)
{
if (args.empty () || args[0].empty ())
fail << "executable name expected in process." << fn << "()";
process_path pp;
try
{
size_t erase;
// This can be a process_path (pair) or just a path.
//
if (args[0].pair)
{
pp = convert<process_path> (move (args[0]), move (args[1]));
erase = 2;
}
else
{
pp = run_search (convert<path> (move (args[0])));
erase = 1;
}
args.erase (args.begin (), args.begin () + erase);
}
catch (const invalid_argument& e)
{
fail << "invalid process." << fn << "() executable path: " << e.what ();
}
strings sargs;
try
{
sargs = convert<strings> (move (args));
}
catch (const invalid_argument& e)
{
fail << "invalid process." << fn << "() argument: " << e.what ();
}
return pair<process_path, strings> (move (pp), move (sargs));
}
static process
run_start (const scope*,
const process_path& pp,
const strings& args,
cstrings& cargs)
{
cargs.reserve (args.size () + 2);
cargs.push_back (pp.recall_string ());
transform (args.begin (),
args.end (),
back_inserter (cargs),
[] (const string& s) {return s.c_str ();});
cargs.push_back (nullptr);
return run_start (3 /* verbosity */,
pp,
cargs.data (),
0 /* stdin */,
-1 /* stdout */);
}
static value
run (const scope* s, const process_path& pp, const strings& args)
{
cstrings cargs;
process pr (run_start (s, pp, args, cargs));
string v;
try
{
ifdstream is (move (pr.in_ofd));
// Note that getline() will fail if there is no output.
//
if (is.peek () != ifdstream::traits_type::eof ())
getline (is, v, '\0');
is.close (); // Detect errors.
}
catch (const io_error& e)
{
if (run_wait (cargs, pr))
fail << "io error reading " << cargs[0] << " output: " << e;
// If the child process has failed then assume the io error was
// caused by that and let run_finish() deal with it.
}
run_finish (cargs, pr);
names r;
r.push_back (to_name (move (trim (v))));
return value (move (r));
}
regex
parse_regex (const string&, regex::flag_type); // functions-regex.cxx
static value
run_regex (const scope* s,
const process_path& pp,
const strings& args,
const string& pat,
const optional<string>& fmt)
{
regex re (parse_regex (pat, regex::ECMAScript));
cstrings cargs;
process pr (run_start (s, pp, args, cargs));
names r;
try
{
ifdstream is (move (pr.in_ofd), ifdstream::badbit);
for (string l; !eof (getline (is, l)); )
{
if (fmt)
{
pair<string, bool> p (regex_replace_match (l, re, *fmt));
if (p.second)
r.push_back (to_name (move (p.first)));
}
else
{
if (regex_match (l, re))
r.push_back (to_name (move (l)));
}
}
is.close (); // Detect errors.
}
catch (const io_error& e)
{
if (run_wait (cargs, pr))
fail << "io error reading " << cargs[0] << " output: " << e;
// If the child process has failed then assume the io error was
// caused by that and let run_finish() deal with it.
}
run_finish (cargs, pr);
return value (move (r));
}
static inline value
run_regex (const scope* s,
names&& args,
const string& pat,
const optional<string>& fmt)
{
pair<process_path, strings> pa (process_args (move (args), "run_regex"));
return run_regex (s, pa.first, pa.second, pat, fmt);
}
void
process_functions (function_map& m)
{
function_family f (m, "process");
// $process.run(<prog>[ <args>...])
//
// Return trimmed stdout.
//
f[".run"] = [](const scope* s, names args)
{
pair<process_path, strings> pa (process_args (move (args), "run"));
return run (s, pa.first, pa.second);
};
f["run"] = [](const scope* s, process_path pp)
{
return run (s, pp, strings ());
};
// $process.run_regex(<prog>[ <args>...], <pat> [, <fmt>])
//
// Return stdout lines matched and optionally processed with regex.
//
// Each line of stdout (including the customary trailing blank) is matched
// (as a whole) against <pat> and, if successful, returned, optionally
// processed with <fmt>, as an element of a list.
//
f[".run_regex"] = [](const scope* s, names a, string p, optional<string> f)
{
return run_regex (s, move (a), p, f);
};
f[".run_regex"] = [] (const scope* s, names a, names p, optional<names> f)
{
return run_regex (s,
move (a),
convert<string> (move (p)),
f ? convert<string> (move (*f)) : nullopt_string);
};
f["run_regex"] = [](const scope* s,
process_path pp,
string p,
optional<string> f)
{
return run_regex (s, pp, strings (), p, f);
};
f["run_regex"] = [](const scope* s,
process_path pp,
names p,
optional<names> f)
{
return run_regex (s,
pp, strings (),
convert<string> (move (p)),
f ? convert<string> (move (*f)) : nullopt_string);
};
}
}
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