home/src/command_manager.cc

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#include "command_manager.hh"
#include "alias_registry.hh"
#include "assert.hh"
#include "buffer_utils.hh"
#include "context.hh"
#include "flags.hh"
#include "optional.hh"
#include "ranges.hh"
#include "register_manager.hh"
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#include "shell_manager.hh"
#include "utils.hh"
#include <algorithm>
namespace Kakoune
{
bool CommandManager::command_defined(StringView command_name) const
{
return m_commands.find(command_name) != m_commands.end();
}
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void CommandManager::register_command(String command_name,
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CommandFunc func,
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String docstring,
ParameterDesc param_desc,
CommandFlags flags,
CommandHelper helper,
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CommandCompleter completer)
{
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m_commands[command_name] = { std::move(func),
std::move(docstring),
std::move(param_desc),
flags,
std::move(helper),
std::move(completer) };
}
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struct parse_error : runtime_error
{
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parse_error(StringView error)
: runtime_error{format("parse error: {}", error)} {}
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};
Codepoint Reader::operator*() const
{
kak_assert(pos < str.end());
return utf8::codepoint(pos, str.end());
}
Reader& Reader::operator++()
{
kak_assert(pos < str.end());
if (*pos == '\n')
++line;
utf8::to_next(pos, str.end());
return *this;
}
namespace
{
bool is_command_separator(Codepoint c)
{
return c == ';' or c == '\n';
}
template<typename Func, typename UnescapeFunc>
String get_until_delimiter(Reader& reader, Func is_delimiter,
UnescapeFunc unescape = [](Codepoint) { return false; })
{
auto beg = reader.pos;
String str;
bool was_antislash = false;
while (reader)
{
const Codepoint c = *reader;
if (is_delimiter(c) or (was_antislash and unescape(c)))
{
str += reader.substr_from(beg);
if (was_antislash)
{
str.back() = c;
beg = reader.pos+1;
}
else
return str;
}
was_antislash = c == '\\';
++reader;
}
if (beg < reader.str.end())
str += reader.substr_from(beg);
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return str;
}
[[gnu::always_inline]]
inline String get_until_delimiter(Reader& reader, Codepoint c)
{
return get_until_delimiter(reader, [c](Codepoint ch) { return c == ch; }, [](Codepoint) { return false; });
}
StringView get_until_closing_delimiter(Reader& reader, Codepoint opening_delimiter,
Codepoint closing_delimiter)
{
kak_assert(utf8::codepoint(utf8::previous(reader.pos, reader.str.begin()),
reader.str.end()) == opening_delimiter);
int level = 0;
auto start = reader.pos;
while (reader)
{
const Codepoint c = *reader;
if (c == opening_delimiter)
++level;
else if (c == closing_delimiter)
{
if (level > 0)
--level;
else
break;
}
++reader;
}
return reader.substr_from(start);
}
Token::Type token_type(StringView type_name, bool throw_on_invalid)
{
if (type_name == "")
return Token::Type::RawQuoted;
else if (type_name == "sh")
return Token::Type::ShellExpand;
else if (type_name == "reg")
return Token::Type::RegisterExpand;
else if (type_name == "opt")
return Token::Type::OptionExpand;
else if (type_name == "val")
return Token::Type::ValExpand;
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else if (type_name == "arg")
return Token::Type::ArgExpand;
else if (throw_on_invalid)
throw parse_error{format("unknown expand '{}'", type_name)};
else
return Token::Type::RawQuoted;
}
void skip_blanks_and_comments(Reader& reader)
{
while (reader)
{
const Codepoint c = *reader;
if (is_horizontal_blank(c))
++reader;
else if (c == '\\' and reader.pos + 1 != reader.str.end() and
*(reader.pos + 1) == '\n')
++(++reader);
else if (c == '#')
{
while (reader and *reader != '\n')
++reader;
}
else
break;
}
}
Token parse_percent_token(Reader& reader, bool throw_on_unterminated)
{
kak_assert(*reader == '%');
++reader;
const auto type_start = reader.pos;
while (reader and iswalpha(*reader))
++reader;
StringView type_name = reader.substr_from(type_start);
if (not reader or is_blank(*reader))
{
if (throw_on_unterminated)
throw parse_error{format("expected a string delimiter after '%{}'",
type_name)};
return {};
}
Token::Type type = token_type(type_name, throw_on_unterminated);
constexpr struct CharPair { Codepoint opening; Codepoint closing; } matching_pairs[] = {
{ '(', ')' }, { '[', ']' }, { '{', '}' }, { '<', '>' }
};
const Codepoint opening_delimiter = *reader;
auto coord = reader.coord();
++reader;
auto start = reader.pos;
auto it = find_if(matching_pairs, [opening_delimiter](const CharPair& cp)
{ return opening_delimiter == cp.opening; });
const auto str_beg = reader.str.begin();
if (it != std::end(matching_pairs))
{
const Codepoint closing_delimiter = it->closing;
auto token = get_until_closing_delimiter(reader, opening_delimiter,
closing_delimiter);
if (throw_on_unterminated and not reader)
throw parse_error{format("{}:{}: unterminated string '%{}{}...{}'",
coord.line, coord.column, type_name,
opening_delimiter, closing_delimiter)};
return {type, start - str_beg, coord, token.str()};
}
else
{
String token = get_until_delimiter(reader, opening_delimiter);
if (throw_on_unterminated and not reader)
throw parse_error{format("{}:{}: unterminated string '%{}{}...{}'",
coord.line, coord.column, type_name,
opening_delimiter, opening_delimiter)};
return {type, start - str_beg, coord, std::move(token)};
}
}
String expand_token(const Token& token, const Context& context,
const ShellContext& shell_context)
{
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auto& content = token.content;
switch (token.type)
{
case Token::Type::ShellExpand:
{
auto str = ShellManager::instance().eval(
content, context, {}, ShellManager::Flags::WaitForStdout,
shell_context).first;
int trailing_eol_count = 0;
for (auto c : str | reverse())
{
if (c != '\n')
break;
++trailing_eol_count;
}
str.resize(str.length() - trailing_eol_count, 0);
return str;
}
case Token::Type::RegisterExpand:
return context.main_sel_register_value(content).str();
case Token::Type::OptionExpand:
return context.options()[content].get_as_string();
case Token::Type::ValExpand:
{
auto it = shell_context.env_vars.find(content);
if (it != shell_context.env_vars.end())
return it->value;
return ShellManager::instance().get_val(content, context);
}
case Token::Type::ArgExpand:
{
auto& params = shell_context.params;
if (content == '@')
return join(params, ' ');
const int arg = str_to_int(content)-1;
if (arg < 0)
throw runtime_error("invalid argument index");
return arg < params.size() ? params[arg] : String{};
}
case Token::Type::RawEval:
return expand(content, context, shell_context);
case Token::Type::Raw:
case Token::Type::RawQuoted:
return content;
default: kak_assert(false);
}
return {};
}
}
CommandParser::CommandParser(StringView command_line) : m_reader{command_line} {}
Optional<Token> CommandParser::read_token(bool throw_on_unterminated)
{
skip_blanks_and_comments(m_reader);
if (not m_reader)
return {};
const StringView line = m_reader.str;
const char* start = m_reader.pos;
auto coord = m_reader.coord();
const Codepoint c = *m_reader;
if (c == '"' or c == '\'')
{
start = (++m_reader).pos;
String token = get_until_delimiter(m_reader, c);
if (throw_on_unterminated and not m_reader)
throw parse_error{format("unterminated string {0}...{0}", c)};
if (m_reader)
++m_reader;
return Token{c == '"' ? Token::Type::RawEval
: Token::Type::RawQuoted,
start - line.begin(), coord, std::move(token)};
}
else if (c == '%')
{
auto token = parse_percent_token(m_reader, throw_on_unterminated);
if (m_reader)
++m_reader;
return token;
}
else if (is_command_separator(*m_reader))
{
++m_reader;
return Token{Token::Type::CommandSeparator,
m_reader.pos - line.begin(), coord, {}};
}
else
{
String str = get_until_delimiter(m_reader, [](Codepoint c) {
return is_command_separator(c) or is_horizontal_blank(c);
}, [](Codepoint c) { return c == '%'; });
return Token{Token::Type::Raw, start - line.begin(),
coord, std::move(str)};
}
return {};
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}
template<typename Postprocess>
String expand_impl(StringView str, const Context& context,
const ShellContext& shell_context,
Postprocess postprocess)
{
Reader reader{str};
String res;
auto beg = str.begin();
while (reader)
{
Codepoint c = *reader;
if (c == '\\')
{
if (not (++reader))
throw parse_error{"unterminated escape"};
c = *reader;
if (c == '%' or c == '\\')
{
res += reader.substr_from(beg);
res.back() = c;
beg = (++reader).pos;
}
}
else if (c == '%')
{
res += reader.substr_from(beg);
res += postprocess(expand_token(parse_percent_token(reader, true),
context, shell_context));
beg = (++reader).pos;
}
else
++reader;
}
res += reader.substr_from(beg);
return res;
}
String expand(StringView str, const Context& context,
const ShellContext& shell_context)
{
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return expand_impl(str, context, shell_context, [](String s){ return s; });
}
String expand(StringView str, const Context& context,
const ShellContext& shell_context,
const std::function<String (String)>& postprocess)
{
return expand_impl(str, context, shell_context,
[&](String s) { return postprocess(std::move(s)); });
}
struct command_not_found : runtime_error
{
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command_not_found(StringView name)
: runtime_error(name + " : no such command") {}
};
CommandManager::CommandMap::const_iterator
CommandManager::find_command(const Context& context, StringView name) const
{
auto alias = context.aliases()[name];
StringView cmd_name = alias.empty() ? name : alias;
return m_commands.find(cmd_name);
}
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void CommandManager::execute_single_command(CommandParameters params,
Context& context,
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const ShellContext& shell_context,
BufferCoord pos)
{
if (params.empty())
return;
constexpr int max_command_depth = 100;
if (m_command_depth > max_command_depth)
throw runtime_error("maximum nested command depth hit");
++m_command_depth;
auto pop_cmd = on_scope_end([this] { --m_command_depth; });
ParameterList param_view(params.begin()+1, params.end());
auto command_it = find_command(context, params[0]);
if (command_it == m_commands.end())
throw command_not_found(params[0]);
const DebugFlags debug_flags = context.options()["debug"].get<DebugFlags>();
if (debug_flags & DebugFlags::Commands)
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write_to_debug_buffer(format("command {} {}", params[0], join(param_view, ' ')));
try
{
ParametersParser parameter_parser(param_view,
command_it->value.param_desc);
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command_it->value.func(parameter_parser, context, shell_context);
}
catch (runtime_error& error)
{
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throw runtime_error(format("{}:{}: '{}' {}", pos.line+1, pos.column+1,
params[0], error.what()));
}
}
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void CommandManager::execute(StringView command_line,
Context& context, const ShellContext& shell_context)
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{
CommandParser parser(command_line);
struct ShellParser {
ShellParser(String&& str) : output{std::move(str)}, parser{output} {}
String output;
CommandParser parser;
};
Vector<ShellParser> shell_parser_stack;
auto next_token = [&] {
while (not shell_parser_stack.empty())
{
if (auto shell_token = shell_parser_stack.back().parser.read_token(true))
return shell_token;
shell_parser_stack.pop_back();
}
return parser.read_token(true);
};
BufferCoord command_coord;
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Vector<String> params;
while (Optional<Token> token_opt = next_token())
{
auto& token = *token_opt;
if (params.empty())
command_coord = token.coord;
if (token.type == Token::Type::CommandSeparator)
{
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execute_single_command(params, context, shell_context, command_coord);
params.clear();
}
// Shell expand are retokenized
else if (token.type == Token::Type::ShellExpand)
shell_parser_stack.emplace_back(expand_token(token, context, shell_context));
else if (token.type == Token::Type::ArgExpand and token.content == '@')
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params.insert(params.end(), shell_context.params.begin(),
shell_context.params.end());
else
params.push_back(expand_token(token, context, shell_context));
}
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execute_single_command(params, context, shell_context, command_coord);
}
Optional<CommandInfo> CommandManager::command_info(const Context& context, StringView command_line) const
{
CommandParser parser{command_line};
Vector<Token> tokens;
while (auto token = parser.read_token(false))
{
if (token->type == Token::Type::CommandSeparator)
tokens.clear();
else
tokens.push_back(std::move(*token));
}
if (tokens.empty() or
(tokens.front().type != Token::Type::Raw and
tokens.front().type != Token::Type::RawQuoted))
return {};
auto cmd = find_command(context, tokens.front().content);
if (cmd == m_commands.end())
return {};
CommandInfo res;
res.name = cmd->key;
if (not cmd->value.docstring.empty())
res.info += cmd->value.docstring + "\n";
if (cmd->value.helper)
{
Vector<String> params;
for (auto it = tokens.begin() + 1; it != tokens.end(); ++it)
{
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if (it->type == Token::Type::Raw or
it->type == Token::Type::RawQuoted or
it->type == Token::Type::RawEval)
params.push_back(it->content);
}
String helpstr = cmd->value.helper(context, params);
if (not helpstr.empty())
res.info += format("{}\n", helpstr);
}
String aliases;
for (auto& alias : context.aliases().aliases_for(cmd->key))
aliases += " " + alias;
if (not aliases.empty())
res.info += format("Aliases:{}\n", aliases);
auto& switches = cmd->value.param_desc.switches;
if (not switches.empty())
res.info += format("Switches:\n{}", indent(generate_switches_doc(switches)));
return res;
}
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Completions CommandManager::complete_command_name(const Context& context, StringView query) const
{
auto commands = m_commands
| filter([](const CommandMap::Item& cmd) { return not (cmd.value.flags & CommandFlags::Hidden); })
| transform(&CommandMap::Item::key);
auto aliases = context.aliases().flatten_aliases()
| transform(&HashItem<String, String>::key)
| filter([](auto& alias) { return alias.length() > 3; });
return {0, query.length(), Kakoune::complete(query, query.length(), concatenated(commands, aliases))};
}
Completions CommandManager::complete(const Context& context,
CompletionFlags flags,
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StringView command_line,
ByteCount cursor_pos)
{
CommandParser parser{command_line};
const char* cursor = command_line.begin() + (int)cursor_pos;
Vector<Token> tokens;
bool is_last_token = true;
while (auto token = parser.read_token(false))
{
if (token->type == Token::Type::CommandSeparator)
{
tokens.clear();
continue;
}
tokens.push_back(std::move(*token));
if (parser.pos() >= cursor)
{
is_last_token = false;
break;
}
}
if (is_last_token)
tokens.push_back({Token::Type::Raw, command_line.length(), parser.coord(), {}});
kak_assert(not tokens.empty());
const auto& token = tokens.back();
// command name completion
if (tokens.size() == 1 and (token.type == Token::Type::Raw or
token.type == Token::Type::RawQuoted))
{
auto cmd_start = token.pos;
StringView query = command_line.substr(cmd_start, cursor_pos - cmd_start);
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return offset_pos(complete_command_name(context, query), cmd_start);
}
const ByteCount start = token.pos;
const ByteCount cursor_pos_in_token = cursor_pos - start;
switch (token.type)
{
case Token::Type::OptionExpand:
return {start , cursor_pos,
GlobalScope::instance().option_registry().complete_option_name(
token.content, cursor_pos_in_token) };
case Token::Type::ShellExpand:
return offset_pos(shell_complete(context, flags, token.content,
cursor_pos_in_token), start);
case Token::Type::ValExpand:
return {start , cursor_pos,
ShellManager::instance().complete_env_var(
token.content, cursor_pos_in_token) };
case Token::Type::Raw:
case Token::Type::RawQuoted:
case Token::Type::RawEval:
{
if (token.type != Token::Type::Raw and token.type != Token::Type::RawQuoted)
return Completions{};
StringView command_name = tokens.front().content;
if (command_name != m_last_complete_command)
{
m_last_complete_command = command_name.str();
flags |= CompletionFlags::Start;
}
auto command_it = find_command(context, command_name);
if (command_it == m_commands.end() or
not command_it->value.completer)
return Completions();
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Vector<String> params;
for (auto it = tokens.begin() + 1; it != tokens.end(); ++it)
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params.push_back(it->content);
Completions completions = offset_pos(command_it->value.completer(
context, flags, params, tokens.size() - 2,
cursor_pos_in_token), start);
if (token.type != Token::Type::RawQuoted)
{
StringView to_escape = token.type == Token::Type::Raw ? "% \t;" : "%";
for (auto& candidate : completions.candidates)
candidate = escape(candidate, to_escape, '\\');
}
return completions;
}
default:
break;
}
return Completions{};
}
Completions CommandManager::complete(const Context& context,
CompletionFlags flags,
CommandParameters params,
size_t token_to_complete,
ByteCount pos_in_token)
{
StringView prefix = params[token_to_complete].substr(0, pos_in_token);
if (token_to_complete == 0)
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return complete_command_name(context, prefix);
else
{
StringView command_name = params[0];
if (command_name != m_last_complete_command)
{
m_last_complete_command = command_name.str();
flags |= CompletionFlags::Start;
}
auto command_it = find_command(context, command_name);
if (command_it != m_commands.end() and command_it->value.completer)
return command_it->value.completer(
context, flags, params.subrange(1),
token_to_complete-1, pos_in_token);
}
return Completions{};
}
}