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kakoune/src/insert_completer.cc

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#include "insert_completer.hh"
#include "buffer_manager.hh"
#include "buffer_utils.hh"
#include "context.hh"
#include "display_buffer.hh"
#include "face_registry.hh"
#include "file.hh"
#include "regex.hh"
#include "user_interface.hh"
#include "window.hh"
#include "word_db.hh"
namespace Kakoune
{
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using StringList = Vector<String, MemoryDomain::Options>;
String option_to_string(const InsertCompleterDesc& opt)
{
switch (opt.mode)
{
case InsertCompleterDesc::Word:
return "word=" + (opt.param ? *opt.param : "");
case InsertCompleterDesc::Filename:
return "filename";
case InsertCompleterDesc::Option:
return "option=" + (opt.param ? *opt.param : "");
}
kak_assert(false);
return "";
}
void option_from_string(StringView str, InsertCompleterDesc& opt)
{
if (str.substr(0_byte, 7_byte) == "option=")
{
opt.mode = InsertCompleterDesc::Option;
opt.param = str.substr(7_byte).str();
return;
}
else if (str.substr(0_byte, 5_byte) == "word=")
{
auto param = str.substr(5_byte);
if (param == "all" or param == "buffer")
{
opt.mode = InsertCompleterDesc::Word;
opt.param = param.str();
return;
}
}
else if (str == "filename")
{
opt.mode = InsertCompleterDesc::Filename;
opt.param = Optional<String>{};
return;
}
throw runtime_error(format("invalid completer description: '{}'", str));
}
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, bool subseq>
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, buffer.begin())))
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};
struct MatchAndBuffer {
MatchAndBuffer(StringView m, const Buffer* b = nullptr) : match(m), buffer(b) {}
bool operator==(const MatchAndBuffer& other) { return match == other.match; }
bool operator<(const MatchAndBuffer& other) { return match < other.match; }
StringView match;
const Buffer* buffer;
};
Vector<MatchAndBuffer> matches;
auto add_matches = [&](const Buffer& buf) {
auto& word_db = get_word_db(buf);
auto bufmatches = word_db.find_matching(
prefix, subseq ? subsequence_match : prefix_match);
for (auto& m : bufmatches)
matches.push_back({ m, &buf });
};
add_matches(buffer);
if (get_word_db(buffer).get_word_occurences(current_word) <= 1)
unordered_erase(matches, StringView{current_word});
if (other_buffers)
{
for (const auto& buf : BufferManager::instance())
{
if (buf.get() == &buffer)
continue;
add_matches(*buf);
}
}
unordered_erase(matches, StringView{prefix});
std::sort(matches.begin(), matches.end());
matches.erase(std::unique(matches.begin(), matches.end()), matches.end());
const auto longest = std::accumulate(matches.begin(), matches.end(), 0_char,
[](const CharCount& lhs, const MatchAndBuffer& rhs)
{ return std::max(lhs, rhs.match.char_length()); });
InsertCompletion::CandidateList candidates;
candidates.reserve(matches.size());
for (auto& m : matches)
{
String menu_entry;
if (m.buffer)
menu_entry = m.match.str() +
String{' ', longest + 1 - m.match.char_length()} +
m.buffer->display_name();
candidates.push_back({m.match.str(), "", std::move(menu_entry)});
}
return { begin.coord(), cursor_pos, std::move(candidates), 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 {};
InsertCompletion::CandidateList candidates;
if (prefix.front() == '/')
{
for (auto& filename : Kakoune::complete_filename(prefix, Regex{}))
candidates.push_back({std::move(filename), ""});
}
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{}))
candidates.push_back({filename.substr(dir.length()).str(), ""});
}
}
if (candidates.empty())
return {};
return { begin.coord(), pos.coord(), std::move(candidates), buffer.timestamp() };
}
InsertCompletion complete_option(const Buffer& buffer, ByteCoord cursor_pos,
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OptionManager& options, StringView 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+))");
MatchResults<String::const_iterator> match;
if (regex_match(desc.begin(), desc.end(), match, re))
{
ByteCoord coord{ str_to_int({match[1].first, match[1].second}) - 1,
str_to_int({match[2].first, match[2].second}) - 1 };
if (not buffer.is_valid(coord))
return {};
auto end = coord;
if (match[3].matched)
{
ByteCount len = str_to_int({match[3].first, match[3].second});
end = buffer.advance(coord, len);
}
size_t timestamp = (size_t)str_to_int({match[4].first, match[4].second});
auto changes = buffer.changes_since(timestamp);
if (find_if(changes, [&](const Buffer::Change& change){
return change.begin < coord;
}) != changes.end())
return {};
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if (cursor_pos.line == coord.line and cursor_pos.column >= coord.column)
{
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StringView prefix = buffer[coord.line].substr(
coord.column, cursor_pos.column - coord.column);
InsertCompletion::CandidateList candidates;
for (auto it = opt.begin() + 1; it != opt.end(); ++it)
{
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auto splitted = split(*it, '@');
if (not splitted.empty() and prefix_match(splitted[0], prefix))
{
StringView completion = splitted[0];
StringView docstring = splitted.size() > 1 ? splitted[1] : StringView{};
StringView menu_entry = splitted.size() > 2 ? splitted[2] : StringView{};
candidates.push_back({completion.str(), docstring.str(), menu_entry.str()});
}
}
return { coord, end, std::move(candidates), timestamp };
}
}
return {};
}
InsertCompletion complete_line(const Buffer& buffer, ByteCoord cursor_pos)
{
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StringView prefix = buffer[cursor_pos.line].substr(0_byte, cursor_pos.column);
InsertCompletion::CandidateList candidates;
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()))
candidates.push_back({buffer[l].substr(0_byte, len-1).str(), ""});
}
if (candidates.empty())
return {};
std::sort(candidates.begin(), candidates.end());
candidates.erase(std::unique(candidates.begin(), candidates.end()), candidates.end());
return { cursor_pos.line, cursor_pos, std::move(candidates), buffer.timestamp() };
}
}
InsertCompleter::InsertCompleter(const Context& context)
: m_context(context), m_options(context.options())
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{
m_options.register_watcher(*this);
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}
InsertCompleter::~InsertCompleter()
{
m_options.unregister_watcher(*this);
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}
void InsertCompleter::select(int offset, Vector<Key>& keystrokes)
{
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 InsertCompletion::Candidate& 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));
auto ref = buffer.string(m_completions.begin, m_completions.end);
for (auto& sel : selections)
{
const auto& cursor = sel.cursor();
auto pos = buffer.iterator_at(cursor);
if (cursor.column >= prefix_len and (pos + suffix_len) != buffer.end() and
std::equal(ref.begin(), ref.end(), pos - prefix_len))
{
pos = buffer.erase(pos - prefix_len, pos + suffix_len);
buffer.insert(pos, candidate.completion);
const_cast<SelectionList&>(selections).update();
}
}
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m_completions.end = cursor_pos;
m_completions.begin = buffer.advance(cursor_pos, -candidate.completion.length());
m_completions.timestamp = buffer.timestamp();
if (m_context.has_ui())
{
m_context.ui().menu_select(m_current_candidate);
if (not candidate.docstring.empty())
m_context.ui().info_show(candidate.completion, candidate.docstring, CharCoord{},
get_face("Information"), InfoStyle::MenuDoc);
}
for (auto i = 0_byte; i < prefix_len; ++i)
keystrokes.push_back(Key::Backspace);
for (auto i = 0_byte; i < suffix_len; ++i)
keystrokes.push_back(Key::Delete);
for (auto& c : candidate.completion)
keystrokes.push_back(c);
}
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.completion.length());
ByteCoord cursor = m_context.selections().main().cursor();
ByteCoord compl_beg = m_completions.begin;
if (cursor.line == compl_beg.line and
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compl_beg.column <= cursor.column and
cursor.column < compl_beg.column + longest_completion)
{
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.completion.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();
m_context.ui().info_hide();
}
}
bool InsertCompleter::setup_ifn()
{
using namespace std::placeholders;
if (not m_completions.is_valid())
{
auto& completers = m_options["completers"].get<InsertCompleterDescList>();
for (auto& completer : completers)
{
if (completer.mode == InsertCompleterDesc::Filename and
try_complete([this](const Buffer& buffer, ByteCoord cursor_pos) {
return complete_filename<true>(buffer, cursor_pos,
m_options);
}))
return true;
if (completer.mode == InsertCompleterDesc::Option and
try_complete([&,this](const Buffer& buffer, ByteCoord cursor_pos) {
return complete_option(buffer, cursor_pos,
m_options, *completer.param);
}))
return true;
if (completer.mode == InsertCompleterDesc::Word and
*completer.param == "buffer" and
(try_complete(complete_word<false, false>) or
try_complete(complete_word<false, true>)))
return true;
if (completer.mode == InsertCompleterDesc::Word and
*completer.param == "all" and
(try_complete(complete_word<true, false>) or
try_complete(complete_word<true, true>)))
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_options["tabstop"].get<int>();
const CharCount column = get_column(m_context.buffer(), tabstop,
m_completions.begin);
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Vector<String> menu_entries;
for (auto& candidate : m_matching_candidates)
{
const String& entry = candidate.menu_entry.empty() ?
candidate.completion : candidate.menu_entry;
menu_entries.push_back(expand_tabs(entry, tabstop, column));
}
m_context.ui().menu_show(menu_entries, menu_pos,
get_face("MenuForeground"),
get_face("MenuBackground"),
MenuStyle::Inline);
m_context.ui().menu_select(m_current_candidate);
}
void InsertCompleter::on_option_changed(const Option& opt)
{
// Do not reset the menu if the user has selected an entry
if (not m_matching_candidates.empty() and
m_current_candidate != m_matching_candidates.size() - 1)
return;
auto& completers = m_options["completers"].get<InsertCompleterDescList>();
for (auto& completer : completers)
{
if (completer.mode == InsertCompleterDesc::Option and
*completer.param == opt.name())
{
reset();
setup_ifn();
break;
}
}
}
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_to_debug_buffer(format("error while trying to run completer: {}", 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, m_options);
});
}
void InsertCompleter::explicit_word_complete()
{
try_complete(complete_word<true, true>);
}
void InsertCompleter::explicit_line_complete()
{
try_complete([this](const Buffer& buffer, ByteCoord cursor_pos) {
return complete_line(buffer, cursor_pos);
});
}
}