kakoune/src/insert_completer.cc

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#include "insert_completer.hh"
#include "buffer_manager.hh"
#include "buffer_utils.hh"
#include "color_registry.hh"
#include "context.hh"
#include "debug.hh"
#include "display_buffer.hh"
#include "file.hh"
#include "user_interface.hh"
#include "window.hh"
#include "word_db.hh"
namespace Kakoune
{
using StringList = std::vector<String>;
namespace
{
WordDB& get_word_db(const Buffer& buffer)
{
static const ValueId word_db_id = ValueId::get_free_id();
Value& cache_val = buffer.values()[word_db_id];
if (not cache_val)
cache_val = Value(WordDB{buffer});
return cache_val.as<WordDB>();
}
template<bool other_buffers>
InsertCompletion complete_word(const Buffer& buffer, ByteCoord cursor_pos)
{
auto pos = buffer.iterator_at(cursor_pos);
if (pos == buffer.begin() or not is_word(*utf8::previous(pos)))
return {};
auto end = buffer.iterator_at(cursor_pos);
auto begin = end-1;
while (begin != buffer.begin() and is_word(*begin))
--begin;
if (not is_word(*begin))
++begin;
String prefix{begin, end};
while (end != buffer.end() and is_word(*end))
++end;
String current_word{begin, end};
auto& word_db = get_word_db(buffer);
std::unordered_set<String> matches;
auto bufmatches = word_db.find_prefix(prefix);
matches.insert(bufmatches.begin(), bufmatches.end());
if (word_db.get_word_occurences(current_word) <= 1)
matches.erase(current_word);
if (other_buffers)
{
for (const auto& buf : BufferManager::instance())
{
if (buf.get() == &buffer)
continue;
bufmatches = get_word_db(*buf).find_prefix(prefix);
matches.insert(bufmatches.begin(), bufmatches.end());
}
}
matches.erase(prefix);
CandidateList result;
std::copy(matches.begin(), matches.end(),
inserter(result, result.begin()));
std::sort(result.begin(), result.end());
return { begin.coord(), cursor_pos, std::move(result), buffer.timestamp() };
}
template<bool require_slash>
InsertCompletion complete_filename(const Buffer& buffer, ByteCoord cursor_pos,
OptionManager& options)
{
auto pos = buffer.iterator_at(cursor_pos);
auto begin = pos;
auto is_filename = [](char c)
{
return isalnum(c) or c == '/' or c == '.' or c == '_' or c == '-';
};
while (begin != buffer.begin() and is_filename(*(begin-1)))
--begin;
if (begin == pos)
return {};
String prefix{begin, pos};
if (require_slash and not contains(prefix, '/'))
return {};
StringList res;
if (prefix.front() == '/')
res = Kakoune::complete_filename(prefix, Regex{});
else
{
for (auto dir : options["path"].get<StringList>())
{
if (not dir.empty() and dir.back() != '/')
dir += '/';
for (auto& filename : Kakoune::complete_filename(dir + prefix, Regex{}))
res.push_back(filename.substr(dir.length()));
}
}
if (res.empty())
return {};
return { begin.coord(), pos.coord(), std::move(res), buffer.timestamp() };
}
InsertCompletion complete_option(const Buffer& buffer, ByteCoord cursor_pos,
OptionManager& options, const String& option_name)
{
const StringList& opt = options[option_name].get<StringList>();;
if (opt.empty())
return {};
auto& desc = opt[0];
static const Regex re(R"((\d+)\.(\d+)(?:\+(\d+))?@(\d+))");
boost::smatch match;
if (boost::regex_match(desc.begin(), desc.end(), match, re))
{
ByteCoord coord{ str_to_int(match[1].str()) - 1, str_to_int(match[2].str()) - 1 };
if (not buffer.is_valid(coord))
return {};
auto end = coord;
if (match[3].matched)
{
ByteCount len = str_to_int(match[3].str());
end = buffer.advance(coord, len);
}
size_t timestamp = (size_t)str_to_int(match[4].str());
ByteCount longest_completion = 0;
for (auto it = opt.begin() + 1; it != opt.end(); ++it)
longest_completion = std::max(longest_completion, it->length());
if (timestamp == buffer.timestamp() and
cursor_pos.line == coord.line and cursor_pos.column >= coord.column and
buffer.distance(coord, cursor_pos) < longest_completion)
return { coord, end, { opt.begin() + 1, opt.end() }, timestamp };
}
return {};
}
InsertCompletion complete_line(const Buffer& buffer, ByteCoord cursor_pos)
{
String prefix = buffer[cursor_pos.line].substr(0_byte, cursor_pos.column);
StringList res;
for (LineCount l = 0_line; l < buffer.line_count(); ++l)
{
if (l == cursor_pos.line)
continue;
ByteCount len = buffer[l].length();
if (len > cursor_pos.column and std::equal(prefix.begin(), prefix.end(), buffer[l].begin()))
res.push_back(buffer[l].substr(0_byte, len-1));
}
if (res.empty())
return {};
std::sort(res.begin(), res.end());
res.erase(std::unique(res.begin(), res.end()), res.end());
return { cursor_pos.line, cursor_pos, std::move(res), buffer.timestamp() };
}
}
InsertCompleter::InsertCompleter(const Context& context)
: OptionManagerWatcher_AutoRegister(context.options()),
m_context(context)
{}
void InsertCompleter::select(int offset)
{
if (not setup_ifn())
return;
auto& buffer = m_context.buffer();
m_current_candidate = (m_current_candidate + offset) % (int)m_matching_candidates.size();
if (m_current_candidate < 0)
m_current_candidate += m_matching_candidates.size();
const String& candidate = m_matching_candidates[m_current_candidate];
auto& selections = m_context.selections();
const auto& cursor_pos = selections.main().cursor();
const auto prefix_len = buffer.distance(m_completions.begin, cursor_pos);
const auto suffix_len = std::max(0_byte, buffer.distance(cursor_pos, m_completions.end));
const auto buffer_len = buffer.byte_count();
auto ref = buffer.string(m_completions.begin, m_completions.end);
for (auto& sel : selections)
{
auto offset = buffer.offset(sel.cursor());
auto pos = buffer.iterator_at(sel.cursor());
if (offset >= prefix_len and offset + suffix_len < buffer_len and
std::equal(ref.begin(), ref.end(), pos - prefix_len))
{
pos = buffer.erase(pos - prefix_len, pos + suffix_len);
buffer.insert(pos, candidate);
const_cast<SelectionList&>(selections).update();
}
}
m_completions.end = cursor_pos;
m_completions.begin = buffer.advance(m_completions.end, -candidate.length());
m_completions.timestamp = buffer.timestamp();
if (m_context.has_ui())
m_context.ui().menu_select(m_current_candidate);
// when we select a match, remove non displayed matches from the candidates
// which are considered as invalid with the new completion timestamp
m_completions.candidates.clear();
std::copy(m_matching_candidates.begin(), m_matching_candidates.end()-1,
std::back_inserter(m_completions.candidates));
}
void InsertCompleter::update()
{
if (m_completions.is_valid())
{
ByteCount longest_completion = 0;
for (auto& candidate : m_completions.candidates)
longest_completion = std::max(longest_completion, candidate.length());
ByteCoord cursor = m_context.selections().main().cursor();
ByteCoord compl_beg = m_completions.begin;
if (cursor.line == compl_beg.line and
is_in_range(cursor.column - compl_beg.column,
ByteCount{0}, longest_completion-1))
{
String prefix = m_context.buffer().string(compl_beg, cursor);
if (m_context.buffer().timestamp() == m_completions.timestamp)
m_matching_candidates = m_completions.candidates;
else
{
m_matching_candidates.clear();
for (auto& candidate : m_completions.candidates)
{
if (candidate.substr(0, prefix.length()) == prefix)
m_matching_candidates.push_back(candidate);
}
}
if (not m_matching_candidates.empty())
{
m_current_candidate = m_matching_candidates.size();
m_completions.end = cursor;
menu_show();
m_matching_candidates.push_back(prefix);
return;
}
}
}
reset();
setup_ifn();
}
void InsertCompleter::reset()
{
m_completions = InsertCompletion{};
if (m_context.has_ui())
m_context.ui().menu_hide();
}
bool InsertCompleter::setup_ifn()
{
using namespace std::placeholders;
if (not m_completions.is_valid())
{
auto& completers = options()["completers"].get<StringList>();
for (auto& completer : completers)
{
if (completer == "filename" and
try_complete([this](const Buffer& buffer, ByteCoord cursor_pos) {
return complete_filename<true>(buffer, cursor_pos,
options());
}))
return true;
if (completer.substr(0_byte, 7_byte) == "option=" and
try_complete([&,this](const Buffer& buffer, ByteCoord cursor_pos) {
return complete_option(buffer, cursor_pos,
options(), completer.substr(7_byte));
}))
return true;
if (completer == "word=buffer" and
try_complete([this](const Buffer& buffer, ByteCoord cursor_pos) {
return complete_word<false>(buffer, cursor_pos);
}))
return true;
if (completer == "word=all" and
try_complete([this](const Buffer& buffer, ByteCoord cursor_pos) {
return complete_word<true>(buffer, cursor_pos);
}))
return true;
}
return false;
}
return true;
}
void InsertCompleter::menu_show()
{
if (not m_context.has_ui())
return;
CharCoord menu_pos = m_context.window().display_position(m_completions.begin);
const CharCount tabstop = m_context.options()["tabstop"].get<int>();
const CharCount column = get_column(m_context.buffer(), tabstop,
m_completions.begin);
std::vector<String> menu_entries;
for (auto& candidate : m_matching_candidates)
menu_entries.push_back(expand_tabs(candidate, tabstop, column));
m_context.ui().menu_show(menu_entries, menu_pos,
get_color("MenuForeground"),
get_color("MenuBackground"),
MenuStyle::Inline);
m_context.ui().menu_select(m_current_candidate);
}
void InsertCompleter::on_option_changed(const Option& opt)
{
auto& completers = options()["completers"].get<StringList>();
StringList option_names;
for (auto& completer : completers)
{
if (completer.substr(0_byte, 7_byte) == "option=")
option_names.emplace_back(completer.substr(7_byte));
}
if (contains(option_names, opt.name()))
{
reset();
setup_ifn();
}
}
template<typename CompleteFunc>
bool InsertCompleter::try_complete(CompleteFunc complete_func)
{
auto& buffer = m_context.buffer();
ByteCoord cursor_pos = m_context.selections().main().cursor();
try
{
m_completions = complete_func(buffer, cursor_pos);
}
catch (runtime_error& e)
{
write_debug("error while trying to run completer: "_str + e.what());
return false;
}
if (not m_completions.is_valid())
return false;
kak_assert(cursor_pos >= m_completions.begin);
m_matching_candidates = m_completions.candidates;
m_current_candidate = m_matching_candidates.size();
menu_show();
m_matching_candidates.push_back(buffer.string(m_completions.begin, m_completions.end));
return true;
}
void InsertCompleter::explicit_file_complete()
{
try_complete([this](const Buffer& buffer, ByteCoord cursor_pos) {
return complete_filename<false>(buffer, cursor_pos, options());
});
}
void InsertCompleter::explicit_word_complete()
{
try_complete([this](const Buffer& buffer, ByteCoord cursor_pos) {
return complete_word<true>(buffer, cursor_pos);
});
}
void InsertCompleter::explicit_line_complete()
{
try_complete([this](const Buffer& buffer, ByteCoord cursor_pos) {
return complete_line(buffer, cursor_pos);
});
}
}