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#include "shell_manager.hh"
#include "context.hh"
#include "buffer_utils.hh"
#include "event_manager.hh"
#include "file.hh"
#include <cstring>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
namespace Kakoune
{
static const Regex env_var_regex(R"(\bkak_(\w+)\b)");
ShellManager::ShellManager()
{
const char* path = getenv("PATH");
auto new_path = format("{}:{}", path, split_path(get_kak_binary_path()).first);
setenv("PATH", new_path.c_str(), 1);
}
std::pair<String, int> ShellManager::eval(
StringView cmdline, const Context& context, StringView input,
Flags flags, ConstArrayView<String> params, const EnvVarMap& env_vars)
{
int write_pipe[2]; // child stdin
int read_pipe[2]; // child stdout
int error_pipe[2]; // child stderr
::pipe(write_pipe);
::pipe(read_pipe);
::pipe(error_pipe);
if (pid_t pid = fork())
{
close(write_pipe[0]);
close(read_pipe[1]);
close(error_pipe[1]);
write(write_pipe[1], input.data(), (int)input.length());
close(write_pipe[1]);
String child_stdout, child_stderr;
int status = 0;
{
auto pipe_reader = [](String& output) {
return [&output](FDWatcher& watcher, EventMode) {
char buffer[1024];
size_t size = read(watcher.fd(), buffer, 1024);
if (size <= 0)
watcher.close_fd();
output += StringView{buffer, buffer+size};
};
};
FDWatcher stdout_watcher{read_pipe[0], pipe_reader(child_stdout)};
FDWatcher stderr_watcher{error_pipe[0], pipe_reader(child_stderr)};
// block SIGCHLD to make sure we wont receive it before
// our call to pselect, that will end up blocking indefinitly.
sigset_t mask, orig_mask;
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &mask, &orig_mask);
// check for termination now that SIGCHLD is blocked
bool terminated = waitpid(pid, &status, WNOHANG);
while (not terminated or
((flags & Flags::WaitForStdout) and
(not stdout_watcher.closed() or
not stderr_watcher.closed())))
{
EventManager::instance().handle_next_events(EventMode::Urgent, &orig_mask);
if (not terminated)
terminated = waitpid(pid, &status, WNOHANG);
}
stdout_watcher.close_fd();
stderr_watcher.close_fd();
sigprocmask(SIG_SETMASK, &orig_mask, nullptr);
}
if (not child_stderr.empty())
write_to_debug_buffer(format("shell stderr: <<<\n{}>>>", child_stderr));
return { child_stdout, WIFEXITED(status) ? WEXITSTATUS(status) : - 1 };
}
else try
{
close(write_pipe[1]);
close(read_pipe[0]);
close(error_pipe[0]);
dup2(read_pipe[1], 1); close(read_pipe[1]);
dup2(error_pipe[1], 2); close(error_pipe[1]);
dup2(write_pipe[0], 0); close(write_pipe[0]);
using RegexIt = RegexIterator<StringView::iterator>;
for (RegexIt it{cmdline.begin(), cmdline.end(), env_var_regex}, end;
it != end; ++it)
{
auto& match = *it;
StringView name{match[1].first, match[1].second};
kak_assert(name.length() > 0);
auto local_var = env_vars.find(name.str());
if (local_var != env_vars.end())
setenv(("kak_" + name).c_str(), local_var->second.c_str(), 1);
else try
{
String value = get_val(name, context);
setenv(format("kak_{}", name).c_str(), value.c_str(), 1);
}
catch (runtime_error&) {}
}
const char* shell = "/bin/sh";
auto cmdlinezstr = cmdline.zstr();
Vector<const char*> execparams = { shell, "-c", cmdlinezstr };
if (not params.empty())
execparams.push_back(shell);
for (auto& param : params)
execparams.push_back(param.c_str());
execparams.push_back(nullptr);
execvp(shell, (char* const*)execparams.data());
exit(-1);
}
catch (...) { exit(-1); }
return {};
}
void ShellManager::register_env_var(StringView regex,
EnvVarRetriever retriever)
{
m_env_vars.push_back({ Regex{regex}, std::move(retriever) });
}
String ShellManager::get_val(StringView name, const Context& context) const
{
auto env_var = std::find_if(
m_env_vars.begin(), m_env_vars.end(),
[name](const std::pair<Regex, EnvVarRetriever>& pair)
{ return regex_match(name.begin(), name.end(), pair.first); });
if (env_var == m_env_vars.end())
throw runtime_error("no such env var: " + name);
return env_var->second(name, context);
}
}
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