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// file : bdep/git.txx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
namespace bdep
{
template <typename... A>
void
run_git (const semantic_version& min_ver,
bool system,
bool progress,
const dir_path* repo,
A&&... args)
{
// Unfortunately git doesn't have any kind of a no-progress option but
// suppresses progress automatically for a non-terminal. So we use this
// feature for the progress suppression by redirecting git's stderr to our
// own diagnostics stream via a proxy pipe.
//
fdpipe pipe;
if (!progress)
pipe = open_pipe ();
int err (!progress ? pipe.out.get () : 2);
// We don't expect git to print anything to stdout, as the caller would
// use start_git() and pipe otherwise. Thus, let's redirect stdout to
// stderr for good measure, as git is known to print some informational
// messages to stdout.
//
process pr (start_git (min_ver,
system,
0 /* stdin */,
err /* stdout */,
err /* stderr */,
(repo != nullptr
? cstrings ({"-C", repo->string ().c_str ()})
: cstrings ()),
forward<A> (args)...));
bool io (false);
if (!progress)
{
// Shouldn't throw, unless something is severely damaged.
//
pipe.out.close ();
try
{
ifdstream is (move (pipe.in), fdstream_mode::skip, ifdstream::badbit);
// We could probably write something like this, instead:
//
// *diag_stream << is.rdbuf () << flush;
//
// However, it would never throw and we could potentially miss the
// reading failure.
//
for (string l; !eof (getline (is, l)); )
*diag_stream << l << std::endl;
is.close ();
}
catch (const io_error&)
{
// Presumably the child process failed and issued diagnostics so let
// finish_git() try to deal with that.
//
io = true;
}
}
finish_git (pr, io);
}
void
git_check_version (const semantic_version& min_ver, bool system);
const pair<process_path, optional<string>>&
git_search (bool system);
template <typename I, typename O, typename E, typename... A>
process
start_git (const semantic_version& min_ver,
bool system,
I&& in, O&& out, E&& err,
A&&... args)
{
git_check_version (min_ver, system);
try
{
const pair<process_path, optional<string>>& git (git_search (system));
const optional<string>& ep (git.second); // --exec-path
// Note that if we are running the bundled git (on Windows) and there is
// no vi editor in PATH, then some commands (e.g. commit) may fail with
// the 'cannot spawn vi' error. To avoid this error, we will pass the
// EDITOR=notepad environment variable as a fallback for the git's
// editor search sequence (GIT_EDITOR, core.editor, VISUAL, EDITOR, vi),
// unless it is already set.
//
const char* vars[] = {nullptr, nullptr};
process_env pe (git.first, vars);
if (ep && !getenv ("EDITOR"))
vars[0] = "EDITOR=notepad";
return process_start_callback (
[] (const char* const args[], size_t n)
{
if (verb >= 2)
print_process (args, n);
},
forward<I> (in), forward<O> (out), forward<E> (err),
pe,
ep,
forward<A> (args)...);
}
catch (const process_error& e)
{
fail << "unable to execute git: " << e << endf;
}
}
template <typename... A>
optional<string>
git_line (const semantic_version& min_ver,
bool system,
bool ie,
char delim,
A&&... args)
{
fdpipe pipe (open_pipe ());
auto_fd null (ie ? open_null () : auto_fd ());
process pr (start_git (min_ver,
system,
0 /* stdin */,
pipe /* stdout */,
ie ? null.get () : 2 /* stderr */,
forward<A> (args)...));
return git_line (move (pr), move (pipe), ie, delim);
}
template <typename... A>
inline optional<string>
git_line (const semantic_version& min_ver,
bool system,
bool ie,
A&&... args)
{
return git_line (min_ver,
system,
ie,
'\n' /* delim */,
forward<A> (args)...);
}
template <typename... A>
inline optional<string>
git_string (const semantic_version& min_ver,
bool system,
bool ie,
A&&... args)
{
return git_line (min_ver,
system,
ie,
'\0' /* delim */,
forward<A> (args)...);
}
template <typename... A>
void
git_push (const common_options& o, const dir_path& repo, A&&... args)
{
// Map verbosity level. Suppress the (too detailed) push command output if
// the verbosity level is 1. However, we still want to see the progress in
// this case, unless we were asked to suppress it (git also suppress
// progress for a non-terminal stderr).
//
cstrings v;
bool progress (!o.no_progress ());
if (verb < 2)
{
v.push_back ("-q");
if (progress)
{
if ((verb == 1 && stderr_term) || o.progress ())
v.push_back ("--progress");
}
else
progress = true; // No need to suppress (already done with -q).
}
else if (verb > 3)
v.push_back ("-v");
run_git (semantic_version {2, 1, 0},
true /* system */,
progress,
repo,
"push",
v,
forward<A> (args)...);
}
}
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