Shell: rewrite the whole shell to use tokens instead of raw strings
tab completion is still running with raw strings and that has to be fixed in the future.
This commit is contained in:
682
userspace/programs/Shell/Input.cpp
Normal file
682
userspace/programs/Shell/Input.cpp
Normal file
@@ -0,0 +1,682 @@
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#include "Alias.h"
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#include "Builtin.h"
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#include "Input.h"
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#include <BAN/ScopeGuard.h>
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#include <BAN/Sort.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <pwd.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static struct termios s_original_termios;
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static struct termios s_raw_termios;
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static bool s_termios_initialized { false };
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static BAN::Vector<BAN::String> list_matching_entries(BAN::StringView path, BAN::StringView start, bool require_executable)
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{
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ASSERT(path.size() < PATH_MAX);
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char path_cstr[PATH_MAX];
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memcpy(path_cstr, path.data(), path.size());
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path_cstr[path.size()] = '\0';
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DIR* dirp = opendir(path_cstr);
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if (dirp == nullptr)
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return {};
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BAN::Vector<BAN::String> result;
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dirent* entry;
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while ((entry = readdir(dirp)))
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{
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if (entry->d_name[0] == '.' && !start.starts_with("."_sv))
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continue;
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if (strncmp(entry->d_name, start.data(), start.size()))
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continue;
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struct stat st;
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if (fstatat(dirfd(dirp), entry->d_name, &st, 0))
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continue;
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if (require_executable)
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{
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if (S_ISDIR(st.st_mode))
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continue;
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if (!(st.st_mode & (S_IXUSR | S_IXGRP | S_IXUSR)))
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continue;
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}
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MUST(result.emplace_back(entry->d_name + start.size()));
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if (S_ISDIR(st.st_mode))
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MUST(result.back().push_back('/'));
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}
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closedir(dirp);
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return BAN::move(result);
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}
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struct TabCompletion
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{
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bool should_escape_spaces { false };
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BAN::StringView prefix;
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BAN::Vector<BAN::String> completions;
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};
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static TabCompletion list_tab_completion_entries(BAN::StringView current_input)
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{
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enum class CompletionType
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{
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Command,
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File,
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};
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BAN::StringView prefix = current_input;
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BAN::String last_argument;
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CompletionType completion_type = CompletionType::Command;
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bool should_escape_spaces = true;
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for (size_t i = 0; i < current_input.size(); i++)
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{
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if (current_input[i] == '\\')
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{
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i++;
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if (i < current_input.size())
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MUST(last_argument.push_back(current_input[i]));
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}
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else if (isspace(current_input[i]) || current_input[i] == ';' || current_input[i] == '|' || current_input.substring(i).starts_with("&&"_sv))
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{
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if (!isspace(current_input[i]))
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completion_type = CompletionType::Command;
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else if (!last_argument.empty())
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completion_type = CompletionType::File;
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if (auto rest = current_input.substring(i); rest.starts_with("||"_sv) || rest.starts_with("&&"_sv))
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i++;
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prefix = current_input.substring(i + 1);
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last_argument.clear();
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should_escape_spaces = true;
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}
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else if (current_input[i] == '\'' || current_input[i] == '"')
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{
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const char quote_type = current_input[i++];
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while (i < current_input.size() && current_input[i] != quote_type)
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MUST(last_argument.push_back(current_input[i++]));
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should_escape_spaces = false;
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}
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else
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{
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MUST(last_argument.push_back(current_input[i]));
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}
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}
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if (last_argument.sv().contains('/'))
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completion_type = CompletionType::File;
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BAN::Vector<BAN::String> result;
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switch (completion_type)
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{
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case CompletionType::Command:
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{
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const char* path_env = getenv("PATH");
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if (path_env)
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{
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auto splitted_path_env = MUST(BAN::StringView(path_env).split(':'));
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for (auto path : splitted_path_env)
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{
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auto matching_entries = list_matching_entries(path, last_argument, true);
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MUST(result.reserve(result.size() + matching_entries.size()));
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for (auto&& entry : matching_entries)
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MUST(result.push_back(BAN::move(entry)));
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}
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}
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Builtin::get().for_each_builtin(
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[&](BAN::StringView name, const Builtin::BuiltinCommand&) -> BAN::Iteration
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{
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if (name.starts_with(last_argument))
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MUST(result.emplace_back(name.substring(last_argument.size())));
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return BAN::Iteration::Continue;
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}
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);
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Alias::get().for_each_alias(
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[&](BAN::StringView name, BAN::StringView) -> BAN::Iteration
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{
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if (name.starts_with(last_argument))
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MUST(result.emplace_back(name.substring(last_argument.size())));
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return BAN::Iteration::Continue;
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}
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);
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break;
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}
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case CompletionType::File:
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{
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BAN::String dir_path;
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if (last_argument.sv().starts_with("/"_sv))
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MUST(dir_path.push_back('/'));
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else
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{
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char cwd_buffer[PATH_MAX];
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if (getcwd(cwd_buffer, sizeof(cwd_buffer)) == nullptr)
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return {};
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MUST(dir_path.reserve(strlen(cwd_buffer) + 1));
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MUST(dir_path.append(cwd_buffer));
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MUST(dir_path.push_back('/'));
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}
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auto match_against = last_argument.sv();
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if (auto idx = match_against.rfind('/'); idx.has_value())
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{
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MUST(dir_path.append(match_against.substring(0, idx.value())));
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match_against = match_against.substring(idx.value() + 1);
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}
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result = list_matching_entries(dir_path, match_against, false);
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break;
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}
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}
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if (auto idx = prefix.rfind('/'); idx.has_value())
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prefix = prefix.substring(idx.value() + 1);
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return { should_escape_spaces, prefix, BAN::move(result) };
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}
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static 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 Input::parse_ps1_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 'u':
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{
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static char* username = nullptr;
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if (username == nullptr)
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{
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auto* passwd = getpwuid(geteuid());
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if (passwd == nullptr)
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break;
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username = new char[strlen(passwd->pw_name) + 1];
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strcpy(username, passwd->pw_name);
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endpwent();
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}
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MUST(prompt.append(username));
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break;
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}
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case 'h':
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{
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MUST(prompt.append(m_hostname));
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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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BAN::Optional<BAN::String> Input::get_input(BAN::Optional<BAN::StringView> custom_prompt)
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{
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tcsetattr(0, TCSANOW, &s_raw_termios);
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BAN::ScopeGuard _([] { tcsetattr(0, TCSANOW, &s_original_termios); });
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BAN::String ps1_prompt;
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if (!custom_prompt.has_value())
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ps1_prompt = parse_ps1_prompt();
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const auto print_prompt =
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[&]()
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{
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if (custom_prompt.has_value())
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printf("%.*s", (int)custom_prompt->size(), custom_prompt->data());
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else
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printf("%.*s", (int)ps1_prompt.size(), ps1_prompt.data());
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};
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const auto prompt_length =
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[&]() -> int
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{
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if (custom_prompt.has_value())
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return custom_prompt->size();
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return character_length(ps1_prompt);
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};
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print_prompt();
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fflush(stdout);
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while (true)
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{
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int chi = getchar();
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if (chi == EOF)
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{
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if (errno != EINTR)
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{
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perror("getchar");
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exit(1);
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}
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clearerr(stdin);
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m_buffers = m_history;
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MUST(m_buffers.emplace_back(""_sv));
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m_buffer_index = m_buffers.size() - 1;
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m_buffer_col = 0;
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putchar('\n');
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print_prompt();
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fflush(stdout);
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continue;
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}
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uint8_t ch = chi;
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if (ch != '\t')
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{
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m_tab_completions.clear();
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m_tab_index.clear();
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}
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if (m_waiting_utf8 > 0)
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{
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m_waiting_utf8--;
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ASSERT((ch & 0xC0) == 0x80);
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putchar(ch);
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MUST(m_buffers[m_buffer_index].insert(ch, m_buffer_col++));
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if (m_waiting_utf8 == 0)
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{
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printf("\e[s%s\e[u", m_buffers[m_buffer_index].data() + m_buffer_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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m_waiting_utf8 = 1;
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else if ((ch & 0xF0) == 0xE0)
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m_waiting_utf8 = 2;
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else if ((ch & 0xF8) == 0xF0)
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m_waiting_utf8 = 3;
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else
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ASSERT_NOT_REACHED();
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putchar(ch);
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MUST(m_buffers[m_buffer_index].insert(ch, m_buffer_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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{
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ch = getchar();
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if (ch != '[')
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break;
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ch = getchar();
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int value = 0;
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while (isdigit(ch))
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{
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value = (value * 10) + (ch - '0');
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ch = getchar();
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}
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switch (ch)
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{
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case 'A':
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if (m_buffer_index > 0)
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{
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m_buffer_index--;
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m_buffer_col = m_buffers[m_buffer_index].size();
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printf("\e[%dG%s\e[K", prompt_length() + 1, m_buffers[m_buffer_index].data());
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fflush(stdout);
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}
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break;
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case 'B':
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if (m_buffer_index < m_buffers.size() - 1)
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{
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m_buffer_index++;
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m_buffer_col = m_buffers[m_buffer_index].size();
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printf("\e[%dG%s\e[K", prompt_length() + 1, m_buffers[m_buffer_index].data());
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fflush(stdout);
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}
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break;
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case 'C':
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if (m_buffer_col < m_buffers[m_buffer_index].size())
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{
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m_buffer_col++;
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while ((m_buffers[m_buffer_index][m_buffer_col - 1] & 0xC0) == 0x80)
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m_buffer_col++;
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printf("\e[C");
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fflush(stdout);
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}
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break;
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case 'D':
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if (m_buffer_col > 0)
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{
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while ((m_buffers[m_buffer_index][m_buffer_col - 1] & 0xC0) == 0x80)
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m_buffer_col--;
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m_buffer_col--;
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printf("\e[D");
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fflush(stdout);
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}
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break;
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case '~':
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switch (value)
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{
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case 3: // delete
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if (m_buffer_col >= m_buffers[m_buffer_index].size())
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break;
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m_buffers[m_buffer_index].remove(m_buffer_col);
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while (m_buffer_col < m_buffers[m_buffer_index].size() && (m_buffers[m_buffer_index][m_buffer_col] & 0xC0) == 0x80)
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m_buffers[m_buffer_index].remove(m_buffer_col);
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printf("\e[s%s \e[u", m_buffers[m_buffer_index].data() + m_buffer_col);
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fflush(stdout);
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break;
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}
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break;
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}
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break;
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}
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case '\x0C': // ^L
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{
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int x = prompt_length() + character_length(m_buffers[m_buffer_index].sv().substring(m_buffer_col)) + 1;
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printf("\e[H\e[J");
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print_prompt();
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printf("%s\e[u\e[1;%dH", m_buffers[m_buffer_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 (m_buffer_col <= 0)
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break;
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while ((m_buffers[m_buffer_index][m_buffer_col - 1] & 0xC0) == 0x80)
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m_buffer_col--;
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m_buffer_col--;
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printf("\e[D");
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fflush(stdout);
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break;
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case '\x01': // ^A
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m_buffer_col = 0;
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printf("\e[%dG", prompt_length() + 1);
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fflush(stdout);
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break;
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case '\x03': // ^C
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putchar('\n');
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print_prompt();
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fflush(stdout);
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m_buffers[m_buffer_index].clear();
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m_buffer_col = 0;
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break;
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case '\x04': // ^D
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if (!m_buffers[m_buffer_index].empty())
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break;
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putchar('\n');
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return {};
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case '\x7F': // backspace
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if (m_buffer_col <= 0)
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break;
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while ((m_buffers[m_buffer_index][m_buffer_col - 1] & 0xC0) == 0x80)
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m_buffers[m_buffer_index].remove(--m_buffer_col);
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m_buffers[m_buffer_index].remove(--m_buffer_col);
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printf("\b\e[s%s \e[u", m_buffers[m_buffer_index].data() + m_buffer_col);
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fflush(stdout);
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break;
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case '\n':
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{
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BAN::String input;
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MUST(input.append(m_buffers[m_buffer_index]));
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|
||||
if (!m_buffers[m_buffer_index].empty())
|
||||
{
|
||||
MUST(m_history.push_back(m_buffers[m_buffer_index]));
|
||||
m_buffers = m_history;
|
||||
MUST(m_buffers.emplace_back(""_sv));
|
||||
}
|
||||
m_buffer_index = m_buffers.size() - 1;
|
||||
m_buffer_col = 0;
|
||||
putchar('\n');
|
||||
|
||||
return input;
|
||||
}
|
||||
case '\t':
|
||||
{
|
||||
// FIXME: tab completion is really hacked together currently.
|
||||
// this should ask token parser about the current parse state
|
||||
// and do completions based on that, not raw strings
|
||||
|
||||
if (m_buffer_col != m_buffers[m_buffer_index].size())
|
||||
continue;
|
||||
|
||||
if (m_tab_completions.has_value())
|
||||
{
|
||||
ASSERT(m_tab_completions->size() >= 2);
|
||||
|
||||
if (!m_tab_index.has_value())
|
||||
m_tab_index = 0;
|
||||
else
|
||||
{
|
||||
MUST(m_buffers[m_buffer_index].resize(m_tab_completion_keep));
|
||||
m_buffer_col = m_tab_completion_keep;
|
||||
*m_tab_index = (*m_tab_index + 1) % m_tab_completions->size();
|
||||
}
|
||||
|
||||
MUST(m_buffers[m_buffer_index].append(m_tab_completions.value()[*m_tab_index]));
|
||||
m_buffer_col += m_tab_completions.value()[*m_tab_index].size();
|
||||
|
||||
printf("\e[%dG%s\e[K", prompt_length() + 1, m_buffers[m_buffer_index].data());
|
||||
fflush(stdout);
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
m_tab_completion_keep = m_buffer_col;
|
||||
auto [should_escape_spaces, prefix, completions] = list_tab_completion_entries(m_buffers[m_buffer_index].sv().substring(0, m_tab_completion_keep));
|
||||
|
||||
BAN::sort::sort(completions.begin(), completions.end(),
|
||||
[](const BAN::String& a, const BAN::String& b) {
|
||||
if (auto cmp = strcmp(a.data(), b.data()))
|
||||
return cmp < 0;
|
||||
return a.size() < b.size();
|
||||
}
|
||||
);
|
||||
|
||||
for (size_t i = 1; i < completions.size();)
|
||||
{
|
||||
if (completions[i - 1] == completions[i])
|
||||
completions.remove(i);
|
||||
else
|
||||
i++;
|
||||
}
|
||||
|
||||
if (completions.empty())
|
||||
break;
|
||||
|
||||
size_t all_match_len = 0;
|
||||
for (;;)
|
||||
{
|
||||
if (completions.front().size() <= all_match_len)
|
||||
break;
|
||||
const char target = completions.front()[all_match_len];
|
||||
|
||||
bool all_matched = true;
|
||||
for (const auto& completion : completions)
|
||||
{
|
||||
if (completion.size() > all_match_len && completion[all_match_len] == target)
|
||||
continue;
|
||||
all_matched = false;
|
||||
break;
|
||||
}
|
||||
|
||||
if (!all_matched)
|
||||
break;
|
||||
all_match_len++;
|
||||
}
|
||||
|
||||
if (all_match_len)
|
||||
{
|
||||
auto completion = completions.front().sv().substring(0, all_match_len);
|
||||
|
||||
BAN::String temp_escaped;
|
||||
if (should_escape_spaces)
|
||||
{
|
||||
MUST(temp_escaped.append(completion));
|
||||
for (size_t i = 0; i < temp_escaped.size(); i++)
|
||||
{
|
||||
if (!isspace(temp_escaped[i]))
|
||||
continue;
|
||||
MUST(temp_escaped.insert('\\', i));
|
||||
i++;
|
||||
}
|
||||
completion = temp_escaped.sv();
|
||||
|
||||
if (!m_buffers[m_buffer_index].empty() && m_buffers[m_buffer_index].back() == '\\' && completion.front() == '\\')
|
||||
completion = completion.substring(1);
|
||||
}
|
||||
|
||||
m_buffer_col += completion.size();
|
||||
MUST(m_buffers[m_buffer_index].append(completion));
|
||||
printf("%.*s", (int)completion.size(), completion.data());
|
||||
fflush(stdout);
|
||||
break;
|
||||
}
|
||||
|
||||
if (completions.size() == 1)
|
||||
{
|
||||
ASSERT(all_match_len == completions.front().size());
|
||||
break;
|
||||
}
|
||||
|
||||
printf("\n");
|
||||
for (size_t i = 0; i < completions.size(); i++)
|
||||
{
|
||||
if (i != 0)
|
||||
printf(" ");
|
||||
const char* format = completions[i].sv().contains(' ') ? "'%.*s%s'" : "%.*s%s";
|
||||
printf(format, (int)prefix.size(), prefix.data(), completions[i].data());
|
||||
}
|
||||
printf("\n");
|
||||
print_prompt();
|
||||
printf("%s", m_buffers[m_buffer_index].data());
|
||||
fflush(stdout);
|
||||
|
||||
if (should_escape_spaces)
|
||||
{
|
||||
for (auto& completion : completions)
|
||||
{
|
||||
for (size_t i = 0; i < completion.size(); i++)
|
||||
{
|
||||
if (!isspace(completion[i]))
|
||||
continue;
|
||||
MUST(completion.insert('\\', i));
|
||||
i++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
m_tab_completion_keep = m_buffer_col;
|
||||
m_tab_completions = BAN::move(completions);
|
||||
|
||||
break;
|
||||
}
|
||||
default:
|
||||
MUST(m_buffers[m_buffer_index].insert(ch, m_buffer_col++));
|
||||
if (m_buffer_col == m_buffers[m_buffer_index].size())
|
||||
putchar(ch);
|
||||
else
|
||||
printf("%c\e[s%s\e[u", ch, m_buffers[m_buffer_index].data() + m_buffer_col);
|
||||
fflush(stdout);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Input::Input()
|
||||
{
|
||||
if (!s_termios_initialized)
|
||||
{
|
||||
tcgetattr(0, &s_original_termios);
|
||||
s_raw_termios = s_original_termios;
|
||||
s_raw_termios.c_lflag &= ~(ECHO | ICANON);
|
||||
atexit([] { tcsetattr(0, TCSANOW, &s_original_termios); });
|
||||
s_termios_initialized = true;
|
||||
}
|
||||
|
||||
char hostname_buffer[HOST_NAME_MAX];
|
||||
if (gethostname(hostname_buffer, sizeof(hostname_buffer)) == 0) {
|
||||
MUST(m_hostname.append(hostname_buffer));
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user