128 lines
2.8 KiB
C++
128 lines
2.8 KiB
C++
#include <luna/String.h>
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#include <luna/Vector.h>
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#include <os/ArgumentParser.h>
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#include <os/File.h>
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#include <os/FileSystem.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <unistd.h>
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using os::File;
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static Result<Vector<char*>> split_command_into_argv(StringView cmd)
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{
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char* str = strdup(cmd.chars());
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Vector<char*> result;
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char* segment = strtok(str, " \n");
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TRY(result.try_append(segment));
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if (segment == NULL) return result;
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for (;;)
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{
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segment = strtok(NULL, " \n");
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TRY(result.try_append(segment));
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if (segment == NULL) return result;
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}
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return result;
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}
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[[noreturn]] static void execute_command(StringView command)
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{
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Vector<char*> argv;
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bool ok = split_command_into_argv(command).try_move_value_or_error(argv, errno);
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if (!ok)
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{
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perror("failed to parse command");
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exit(1);
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}
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if (argv[0] == NULL) exit(0);
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execvp(argv[0], argv.data());
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perror(argv[0]);
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exit(1);
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}
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Result<int> luna_main(int argc, char** argv)
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{
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StringView path;
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StringView command;
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bool interactive { false };
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SharedPtr<File> input_file;
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os::ArgumentParser parser;
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parser.add_positional_argument(path, "path"_sv, "-"_sv);
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parser.add_value_argument(command, 'c', "command"_sv, true);
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parser.parse(argc, argv);
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if (!command.is_empty()) execute_command(command);
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if (path == "-")
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{
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input_file = File::standard_input();
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interactive = true;
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}
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else
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{
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input_file = TRY(File::open(path, File::ReadOnly));
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input_file->set_close_on_exec();
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}
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while (1)
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{
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if (interactive)
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{
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auto cwd = TRY(os::FileSystem::working_directory());
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printf("sh %s%c ", cwd.chars(), getuid() == 0 ? '#' : '$');
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}
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auto cmd = TRY(input_file->read_line());
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if (cmd.is_empty()) break;
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if (strspn(cmd.chars(), " \n") == cmd.length()) continue;
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if (!strncmp(cmd.chars(), "cd", 2))
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{
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auto args = TRY(split_command_into_argv(cmd.view()));
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check("cd"_sv == args[0]);
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if (args.size() == 2)
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{
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auto home = TRY(os::FileSystem::home_directory());
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if (chdir(home.chars()) < 0) perror("cd");
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continue;
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}
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if (chdir(args[1]) < 0) perror("cd");
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continue;
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}
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pid_t child = fork();
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if (child < 0)
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{
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perror("fork");
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return 1;
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}
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if (child == 0) { execute_command(cmd.view()); }
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if (waitpid(child, NULL, 0) < 0)
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{
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perror("waitpid");
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return 1;
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}
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}
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return 0;
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}
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