157 lines
4.4 KiB
C++
157 lines
4.4 KiB
C++
#include "shell_manager.hh"
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#include "context.hh"
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#include "debug.hh"
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#include <cstring>
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#include <sys/types.h>
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#include <sys/wait.h>
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namespace Kakoune
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{
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static const Regex env_var_regex(R"(\bkak_(\w+)\b)");
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ShellManager::ShellManager()
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{
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}
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String ShellManager::eval(StringView cmdline, const Context& context,
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memoryview<String> params,
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const EnvVarMap& env_vars,
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int* exit_status)
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{
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return pipe("", cmdline, context, params, env_vars, exit_status);
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}
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String ShellManager::pipe(StringView input,
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StringView cmdline, const Context& context,
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memoryview<String> params,
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const EnvVarMap& env_vars,
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int* exit_status)
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{
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int write_pipe[2]; // child stdin
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int read_pipe[2]; // child stdout
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int error_pipe[2]; // child stderr
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::pipe(write_pipe);
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::pipe(read_pipe);
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::pipe(error_pipe);
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String output;
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if (pid_t pid = fork())
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{
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close(write_pipe[0]);
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close(read_pipe[1]);
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close(error_pipe[1]);
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write(write_pipe[1], input.data(), (int)input.length());
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close(write_pipe[1]);
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char buffer[1024];
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while (size_t size = read(read_pipe[0], buffer, 1024))
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{
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if (size == -1)
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break;
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output += String(buffer, buffer+size);
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}
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close(read_pipe[0]);
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String errorout;
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while (size_t size = read(error_pipe[0], buffer, 1024))
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{
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if (size == -1)
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break;
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errorout += String(buffer, buffer+size);
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}
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close(error_pipe[0]);
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if (not errorout.empty())
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write_debug("shell stderr: <<<\n" + errorout + ">>>");
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waitpid(pid, exit_status, 0);
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if (exit_status)
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{
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if (WIFEXITED(*exit_status))
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*exit_status = WEXITSTATUS(*exit_status);
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else
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*exit_status = -1;
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}
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}
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else try
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{
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close(write_pipe[1]);
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close(read_pipe[0]);
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close(error_pipe[0]);
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dup2(read_pipe[1], 1); close(read_pipe[1]);
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dup2(error_pipe[1], 2); close(error_pipe[1]);
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dup2(write_pipe[0], 0); close(write_pipe[0]);
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boost::regex_iterator<StringView::iterator> it(cmdline.begin(), cmdline.end(), env_var_regex);
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boost::regex_iterator<StringView::iterator> end;
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while (it != end)
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{
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auto& match = *it;
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StringView name;
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if (match[1].matched)
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name = StringView(match[1].first, match[1].second);
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else if (match[2].matched)
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name = StringView(match[2].first, match[2].second);
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else
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kak_assert(false);
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kak_assert(name.length() > 0);
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auto local_var = env_vars.find(name);
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if (local_var != env_vars.end())
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setenv(("kak_" + name).c_str(), local_var->second.c_str(), 1);
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else
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{
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try
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{
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String value = get_val(name, context);
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setenv(("kak_"_str + name).c_str(), value.c_str(), 1);
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}
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catch (runtime_error&) {}
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}
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++it;
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}
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const char* shell = "/bin/sh";
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auto cmdlinezstr = cmdline.zstr();
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std::vector<const char*> execparams = { shell, "-c", cmdlinezstr };
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if (not params.empty())
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execparams.push_back(shell);
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for (auto& param : params)
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execparams.push_back(param.c_str());
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execparams.push_back(nullptr);
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execvp(shell, (char* const*)execparams.data());
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exit(-1);
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}
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catch (...) { exit(-1); }
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return output;
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}
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void ShellManager::register_env_var(StringView regex,
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EnvVarRetriever retriever)
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{
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m_env_vars.push_back({ Regex(regex.begin(), regex.end()), std::move(retriever) });
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}
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String ShellManager::get_val(StringView name, const Context& context) const
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{
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auto env_var = std::find_if(
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m_env_vars.begin(), m_env_vars.end(),
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[&](const std::pair<Regex, EnvVarRetriever>& pair)
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{ return boost::regex_match(name.begin(), name.end(),
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pair.first); });
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if (env_var == m_env_vars.end())
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throw runtime_error("no such env var: " + name);
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return env_var->second(name, context);
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}
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}
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