478 lines
9.5 KiB
C++
478 lines
9.5 KiB
C++
#include <BAN/Optional.h>
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#include <BAN/ScopeGuard.h>
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#include <BAN/String.h>
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#include <BAN/Vector.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <termios.h>
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#include <unistd.h>
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#define ERROR_RETURN(msg) { perror(msg); return 1; }
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struct termios old_termios, new_termios;
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extern char** environ;
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BAN::Optional<BAN::String> parse_dollar(BAN::StringView command, size_t& i)
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{
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ASSERT(command[i] == '$');
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if (++i >= command.size())
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return "$"sv;
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if (isalnum(command[i]))
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{
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size_t len = 1;
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for (; i + len < command.size(); len++)
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if (!isalnum(command[i + len]))
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break;
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BAN::String name = command.substring(i, len);
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i += len - 1;
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if (const char* value = getenv(name.data()))
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return BAN::StringView(value);
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return ""sv;
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}
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else if (command[i] == '{')
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{
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size_t len = 1;
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for (; i + len < command.size(); len++)
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{
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if (command[i + len] == '}')
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break;
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if (!isalnum(command[i + len]))
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return {};
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}
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if (i + len >= command.size())
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return {};
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BAN::String name = command.substring(i + 1, len - 1);
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i += len;
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if (const char* value = getenv(name.data()))
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return BAN::StringView(value);
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return ""sv;
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}
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else if (command[i] == '[')
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{
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return {};
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}
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else if (command[i] == '(')
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{
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return {};
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}
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return "$"sv;
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}
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BAN::Vector<BAN::String> parse_command(BAN::StringView command)
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{
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enum class State
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{
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Normal,
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SingleQuote,
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DoubleQuote,
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};
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BAN::Vector<BAN::String> result;
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State state = State::Normal;
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BAN::String current;
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for (size_t i = 0; i < command.size(); i++)
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{
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char c = command[i];
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switch (state)
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{
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case State::Normal:
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if (c == '\'')
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state = State::SingleQuote;
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else if (c == '"')
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state = State::DoubleQuote;
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else if (c == '$')
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{
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auto expansion = parse_dollar(command, i);
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if (!expansion.has_value())
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{
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fprintf(stderr, "bad substitution\n");
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return {};
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}
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MUST(current.append(expansion.value()));
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}
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else if (!isspace(c))
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MUST(current.push_back(c));
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else
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{
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if (!current.empty())
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{
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MUST(result.push_back(current));
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current.clear();
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}
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}
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break;
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case State::SingleQuote:
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if (c == '\'')
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state = State::Normal;
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else
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MUST(current.push_back(c));
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break;
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case State::DoubleQuote:
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if (c == '"')
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state = State::Normal;
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else if (c != '$')
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MUST(current.push_back(c));
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else
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{
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auto expansion = parse_dollar(command, i);
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if (!expansion.has_value())
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{
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fprintf(stderr, "bad substitution\n");
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return {};
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}
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MUST(current.append(expansion.value()));
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}
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break;
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}
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}
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// FIXME: handle state != State::Normal
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MUST(result.push_back(BAN::move(current)));
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return result;
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}
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int execute_command(BAN::Vector<BAN::String>& args)
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{
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if (args.empty())
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return 0;
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if (args.front() == "clear"sv)
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{
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fprintf(stdout, "\e[H\e[J");
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fflush(stdout);
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return 0;
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}
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else if (args.front() == "exit"sv)
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{
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exit(0);
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}
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else if (args.front() == "export"sv)
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{
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bool first = false;
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for (const auto& arg : args)
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{
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if (first)
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{
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first = false;
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continue;
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}
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auto split = MUST(arg.sv().split('=', true));
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if (split.size() != 2)
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continue;
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if (setenv(BAN::String(split[0]).data(), BAN::String(split[1]).data(), true) == -1)
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ERROR_RETURN("setenv");
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}
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}
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else if (args.front() == "env"sv)
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{
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char** current = environ;
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while (*current)
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printf("%s\n", *current++);
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}
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else if (args.front() == "cd"sv)
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{
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if (args.size() > 2)
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{
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printf("cd: too many arguments\n");
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return 1;
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}
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BAN::StringView path;
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if (args.size() == 1)
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{
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if (const char* path_env = getenv("HOME"))
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path = path_env;
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else
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return 0;
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}
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else
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path = args[1];
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if (chdir(path.data()) == -1)
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ERROR_RETURN("chdir");
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}
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else if (args.front() == "time"sv)
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{
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args.remove(0);
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timespec start, end;
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if (clock_gettime(CLOCK_MONOTONIC, &start) == -1)
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ERROR_RETURN("clock_gettime");
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int ret = execute_command(args);
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if (clock_gettime(CLOCK_MONOTONIC, &end) == -1)
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ERROR_RETURN("clock_gettime");
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uint64_t total_ns = 0;
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total_ns += (end.tv_sec - start.tv_sec) * 1'000'000'000;
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total_ns += end.tv_nsec - start.tv_nsec;
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int secs = total_ns / 1'000'000'000;
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int msecs = (total_ns % 1'000'000'000) / 1'000'000;
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printf("took %d.%03d s\n", secs, msecs);
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return ret;
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}
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else
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{
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BAN::Vector<char*> cmd_args;
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MUST(cmd_args.reserve(args.size() + 1));
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for (const auto& arg : args)
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MUST(cmd_args.push_back((char*)arg.data()));
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MUST(cmd_args.push_back(nullptr));
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pid_t pid = fork();
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if (pid == 0)
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{
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execv(cmd_args.front(), cmd_args.data());
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perror("execv");
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exit(1);
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}
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if (pid == -1)
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ERROR_RETURN("fork");
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int status;
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if (waitpid(pid, &status, 0) == -1)
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ERROR_RETURN("waitpid");
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return status;
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}
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return 0;
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}
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int character_length(BAN::StringView prompt)
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{
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int length { 0 };
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bool in_escape { false };
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for (char c : prompt)
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{
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if (in_escape)
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{
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if (isalpha(c))
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in_escape = false;
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}
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else
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{
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if (c == '\e')
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in_escape = true;
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else if (((uint8_t)c & 0xC0) != 0x80)
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length++;
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}
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}
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return length;
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}
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BAN::String get_prompt()
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{
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const char* raw_prompt = getenv("PS1");
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if (raw_prompt == nullptr)
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return ""sv;
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BAN::String prompt;
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for (int i = 0; raw_prompt[i]; i++)
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{
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char ch = raw_prompt[i];
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if (ch == '\\')
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{
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switch (raw_prompt[++i])
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{
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case 'e':
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MUST(prompt.push_back('\e'));
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break;
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case 'n':
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MUST(prompt.push_back('\n'));
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break;
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case '\\':
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MUST(prompt.push_back('\\'));
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break;
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case '~':
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{
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char buffer[256];
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if (getcwd(buffer, sizeof(buffer)) == nullptr)
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strcpy(buffer, strerrorname_np(errno));
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const char* home = getenv("HOME");
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size_t home_len = home ? strlen(home) : 0;
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if (home && strncmp(buffer, home, home_len) == 0)
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{
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MUST(prompt.push_back('~'));
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MUST(prompt.append(buffer + home_len));
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}
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else
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{
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MUST(prompt.append(buffer));
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}
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break;
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}
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case '\0':
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MUST(prompt.push_back('\\'));
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break;
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default:
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MUST(prompt.push_back('\\'));
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MUST(prompt.push_back(*raw_prompt));
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break;
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}
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}
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else
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{
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MUST(prompt.push_back(ch));
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}
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}
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return prompt;
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}
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int prompt_length()
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{
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return character_length(get_prompt());
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}
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void print_prompt()
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{
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auto prompt = get_prompt();
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fprintf(stdout, "%.*s", prompt.size(), prompt.data());
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fflush(stdout);
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}
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int main(int argc, char** argv)
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{
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if (argc >= 1)
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setenv("SHELL", argv[0], true);
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setenv("PS1", "\e[32muser@host\e[m:\e[34m\\~\e[m$ ", false);
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tcgetattr(0, &old_termios);
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new_termios = old_termios;
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new_termios.c_lflag &= ~(ECHO | ICANON);
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tcsetattr(0, TCSANOW, &new_termios);
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BAN::Vector<BAN::String> buffers, history;
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MUST(buffers.emplace_back(""sv));
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size_t index = 0;
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size_t col = 0;
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int waiting_utf8 = 0;
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print_prompt();
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while (true)
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{
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uint8_t ch;
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fread(&ch, 1, sizeof(char), stdin);
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if (waiting_utf8 > 0)
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{
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waiting_utf8--;
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ASSERT((ch & 0xC0) == 0x80);
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fputc(ch, stdout);
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MUST(buffers[index].insert(ch, col++));
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if (waiting_utf8 == 0)
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{
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fprintf(stdout, "\e[s%s\e[u", buffers[index].data() + col);
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fflush(stdout);
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}
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continue;
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}
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else if (ch & 0x80)
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{
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if ((ch & 0xE0) == 0xC0)
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waiting_utf8 = 1;
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else if ((ch & 0xF0) == 0xE0)
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waiting_utf8 = 2;
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else if ((ch & 0xF8) == 0xF0)
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waiting_utf8 = 3;
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else
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ASSERT_NOT_REACHED();
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fputc(ch, stdout);
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MUST(buffers[index].insert(ch, col++));
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continue;
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}
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switch (ch)
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{
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case '\e':
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fread(&ch, 1, sizeof(char), stdin);
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if (ch != '[')
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break;
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fread(&ch, 1, sizeof(char), stdin);
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switch (ch)
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{
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case 'A': if (index > 0) { index--; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", prompt_length() + 1, buffers[index].data()); fflush(stdout); } break;
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case 'B': if (index < buffers.size() - 1) { index++; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", prompt_length() + 1, buffers[index].data()); fflush(stdout); } break;
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case 'C': if (col < buffers[index].size()) { col++; while ((buffers[index][col - 1] & 0xC0) == 0x80) col++; fprintf(stdout, "\e[C"); fflush(stdout); } break;
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case 'D': if (col > 0) { while ((buffers[index][col - 1] & 0xC0) == 0x80) col--; col--; fprintf(stdout, "\e[D"); fflush(stdout); } break;
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}
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break;
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case '\x0C': // ^L
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{
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int x = prompt_length() + character_length(buffers[index].sv().substring(col)) + 1;
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fprintf(stdout, "\e[H\e[J");
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print_prompt();
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fprintf(stdout, "%s\e[u\e[1;%dH", buffers[index].data(), x);
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fflush(stdout);
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break;
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}
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case '\b':
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if (col > 0)
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{
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while ((buffers[index][col - 1] & 0xC0) == 0x80)
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buffers[index].remove(--col);
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buffers[index].remove(--col);
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fprintf(stdout, "\b\e[s%s \e[u", buffers[index].data() + col);
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fflush(stdout);
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}
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break;
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case '\n':
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fputc('\n', stdout);
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if (!buffers[index].empty())
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{
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tcsetattr(0, TCSANOW, &old_termios);
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auto parsed_arguments = parse_command(buffers[index]);
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execute_command(parsed_arguments);
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tcsetattr(0, TCSANOW, &new_termios);
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MUST(history.push_back(buffers[index]));
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buffers = history;
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MUST(buffers.emplace_back(""sv));
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}
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print_prompt();
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index = buffers.size() - 1;
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col = 0;
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break;
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default:
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MUST(buffers[index].insert(ch, col++));
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fprintf(stdout, "%c\e[s%s\e[u", ch, buffers[index].data() + col);
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fflush(stdout);
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break;
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}
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}
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tcsetattr(0, TCSANOW, &old_termios);
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return 0;
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}
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