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#include "shell_manager.hh"
#include "context.hh"
#include "debug.hh"
#include <cstring>
#include <sys/types.h>
#include <sys/wait.h>
namespace Kakoune
{
static const Regex env_var_regex(R"(\$\{kak_(\w+)[^}]*\}|\$kak_(\w+))");
ShellManager::ShellManager()
{
}
String ShellManager::eval(const String& cmdline, const Context& context,
memoryview<String> params,
const EnvVarMap& env_vars)
{
return pipe("", cmdline, context, params, env_vars);
}
String ShellManager::pipe(const String& input,
const String& cmdline, const Context& context,
memoryview<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);
String output;
if (pid_t pid = fork())
{
close(write_pipe[0]);
close(read_pipe[1]);
close(error_pipe[1]);
auto data = input.data();
write(write_pipe[1], data.pointer(), data.size());
close(write_pipe[1]);
char buffer[1024];
while (size_t size = read(read_pipe[0], buffer, 1024))
{
if (size == -1)
break;
output += String(buffer, buffer+size);
}
close(read_pipe[0]);
String errorout;
while (size_t size = read(error_pipe[0], buffer, 1024))
{
if (size == -1)
break;
errorout += String(buffer, buffer+size);
}
close(error_pipe[0]);
if (not errorout.empty())
write_debug("shell stderr: <<<\n" + errorout + ">>>");
waitpid(pid, NULL, 0);
}
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]);
boost::regex_iterator<String::const_iterator> it(cmdline.begin(), cmdline.end(), env_var_regex);
boost::regex_iterator<String::const_iterator> end;
while (it != end)
{
auto& match = *it;
String name;
if (match[1].matched)
name = String(match[1].first, match[1].second);
else if (match[2].matched)
name = String(match[2].first, match[2].second);
else
kak_assert(false);
kak_assert(name.length() > 0);
auto local_var = env_vars.find(name);
if (local_var != env_vars.end())
setenv(("kak_" + name).c_str(), local_var->second.c_str(), 1);
else
{
auto env_var = std::find_if(
m_env_vars.begin(), m_env_vars.end(),
[&](const std::pair<Regex, EnvVarRetriever>& pair)
{ return boost::regex_match(name.begin(), name.end(),
pair.first); });
if (env_var != m_env_vars.end())
{
try
{
String value = env_var->second(name, context);
setenv(("kak_" + name).c_str(), value.c_str(), 1);
}
catch (runtime_error&) {}
}
}
++it;
}
String shell = context.options()["shell"].get<String>();
std::vector<const char*> execparams = { shell.c_str(), "-c", cmdline.c_str() };
if (not params.empty())
execparams.push_back(shell.c_str());
for (auto& param : params)
execparams.push_back(param.c_str());
execparams.push_back(NULL);
execvp(shell.c_str(), (char* const*)execparams.data());
exit(-1);
}
catch (...) { exit(-1); }
return output;
}
void ShellManager::register_env_var(const String& regex,
EnvVarRetriever retriever)
{
m_env_vars.push_back({ Regex(regex.begin(), regex.end()), std::move(retriever) });
}
}
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