122 lines
3.0 KiB
C++
122 lines
3.0 KiB
C++
#include <errno.h>
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#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 <os/Process.h>
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#include <pwd.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/utsname.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<String>> split_command_into_args(StringView cmd)
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{
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return cmd.split(" \n"_sv);
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}
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static Result<void> execute_command(StringView command)
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{
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auto args = TRY(split_command_into_args(command));
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if (args.size() < 1) exit(0);
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return os::Process::exec(args[0].view(), args.slice());
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}
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struct utsname g_sysinfo;
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const char* hostname = "";
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const char* username = "";
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char prompt_end = '$';
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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_description("The Luna system's command shell."_sv);
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parser.add_system_program_info("sh"_sv);
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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, "execute a single command and then exit"_sv);
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parser.parse(argc, argv);
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if (!command.is_empty()) TRY(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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if (interactive)
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{
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// Set up everything to form a prompt.
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uname(&g_sysinfo);
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hostname = g_sysinfo.nodename;
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if (getuid() == 0) prompt_end = '#';
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struct passwd* pw = getpwuid(getuid());
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if (pw) { username = pw->pw_name; }
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else { username = getenv("USER"); }
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endpwent();
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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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os::print("%s@%s:%s%c ", username, hostname, cwd.chars(), prompt_end);
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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_args(cmd.view()));
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check(args[0].view() == "cd");
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if (args.size() == 1)
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{
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auto home = TRY(os::FileSystem::home_directory());
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TRY(os::FileSystem::change_directory(home.view()));
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continue;
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}
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TRY(os::FileSystem::change_directory(args[1].view()));
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continue;
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}
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pid_t child = TRY(os::Process::fork());
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if (child == 0) { TRY(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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