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#include "window.hh"
#include "assert.hh"
#include "highlighter.hh"
#include "hook_manager.hh"
#include "context.hh"
#include <algorithm>
#include <sstream>
namespace Kakoune
{
Window::Window(Buffer& buffer)
: Editor(buffer),
m_hooks(buffer.hooks()),
m_options(buffer.options())
{
HighlighterRegistry& registry = HighlighterRegistry::instance();
m_hooks.run_hook("WinCreate", buffer.name(), Context(*this));
m_options.register_watcher(*this);
m_highlighters.append(registry["expand_tabs"](*this, {}));
m_highlighters.append(registry["highlight_selections"](*this, {}));
for (auto& option : m_options.flatten_options())
on_option_changed(option.first, option.second);
}
Window::~Window()
{
m_options.unregister_watcher(*this);
}
void Window::center_selection()
{
BufferIterator cursor = selections().back().last();
m_position.line = std::max(0_line, cursor.line() - m_dimensions.line/2_line);
}
void Window::update_display_buffer()
{
scroll_to_keep_cursor_visible_ifn();
DisplayBuffer::LineList& lines = m_display_buffer.lines();
lines.clear();
for (LineCount line = 0; line < m_dimensions.line; ++line)
{
LineCount buffer_line = m_position.line + line;
if (buffer_line >= buffer().line_count())
break;
BufferIterator line_begin = buffer().iterator_at_line_begin(buffer_line);
BufferIterator line_end = buffer().iterator_at_line_end(buffer_line);
BufferIterator begin = utf8::advance(line_begin, line_end, (int)m_position.column);
BufferIterator end = utf8::advance(begin, line_end, (int)m_dimensions.column);
lines.push_back(DisplayLine(buffer_line));
lines.back().push_back(DisplayAtom(AtomContent(begin, end)));
}
m_display_buffer.compute_range();
m_highlighters(m_display_buffer);
m_display_buffer.optimize();
m_timestamp = buffer().timestamp();
}
void Window::set_position(const DisplayCoord& position)
{
m_position.line = std::max(0_line, position.line);
m_position.column = std::max(0_char, position.column);
}
void Window::set_dimensions(const DisplayCoord& dimensions)
{
m_dimensions = dimensions;
}
void Window::scroll_to_keep_cursor_visible_ifn()
{
const BufferIterator cursor = selections().back().last();
// scroll lines if needed
if (cursor.line() < m_position.line)
m_position.line = cursor.line();
else if (cursor.line() >= m_position.line + m_dimensions.line)
m_position.line = cursor.line() - (m_dimensions.line - 1);
// highlight only the line containing the cursor
DisplayBuffer display_buffer;
DisplayBuffer::LineList& lines = display_buffer.lines();
lines.push_back(DisplayLine(cursor.line()));
BufferIterator line_begin = buffer().iterator_at_line_begin(cursor);
BufferIterator line_end = buffer().iterator_at_line_end(cursor);
lines.back().push_back(DisplayAtom(AtomContent(line_begin, line_end)));
display_buffer.compute_range();
m_highlighters(display_buffer);
// now we can compute where the cursor is in display columns
// (this is only valid if highlighting one line and multiple lines put
// the cursor in the same position, however I do not find any sane example
// of highlighters not doing that)
CharCount column = 0;
for (auto& atom : lines.back())
{
if (atom.content.has_buffer_range() and
atom.content.begin() <= cursor and atom.content.end() > cursor)
{
if (atom.content.type() == AtomContent::BufferRange)
column += utf8::distance(atom.content.begin(), cursor);
else
column += atom.content.content().char_length();
CharCount cursor_col = utf8::distance(line_begin, cursor);
// we could early out on this, but having scrolling left
// faster than not scrolling at all is not really useful.
if (cursor_col < m_position.column)
m_position.column = cursor_col;
else if (column >= m_position.column + m_dimensions.column)
m_position.column = column - (m_dimensions.column - 1);
return;
}
column += atom.content.content().char_length();
}
if (cursor != buffer().end())
{
// the cursor should always be visible.
assert(false);
}
}
DisplayCoord Window::display_position(const BufferIterator& iterator)
{
DisplayCoord res{0,0};
for (auto& line : m_display_buffer.lines())
{
if (line.buffer_line() == iterator.line())
{
for (auto& atom : line)
{
auto& content = atom.content;
if (content.has_buffer_range() and
iterator >= content.begin() and iterator < content.end())
{
res.column += iterator - content.begin();
return res;
}
res.column += content.length();
}
}
++res.line;
}
return { 0, 0 };
}
String Window::status_line() const
{
BufferCoord cursor = selections().back().last().coord();
std::ostringstream oss;
oss << buffer().name();
if (buffer().is_modified())
oss << " [+]";
oss << " -- " << (int)cursor.line+1 << "," << (int)cursor.column+1
<< " -- " << selections().size() << " sel -- ";
if (is_editing())
oss << "[Insert]";
return oss.str();
}
void Window::on_incremental_insertion_end()
{
SelectionList backup(selections());
hooks().run_hook("InsertEnd", "", Context(*this));
select(backup);
}
void Window::on_option_changed(const String& name, const Option& option)
{
String desc = name + "=" + option.as_string();
m_hooks.run_hook("WinSetOption", desc, Context(*this));
}
}
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