Add a wrap highlighter

This commit is contained in:
Maxime Coste 2016-01-24 06:34:51 +00:00 committed by Maxime Coste
parent 93408e4b76
commit a4f9e29d60

View File

@ -647,6 +647,80 @@ HighlighterAndId create_column_highlighter(HighlighterParameters params)
return {"hlcol_" + params[0], make_simple_highlighter(std::move(func))};
}
HighlighterAndId create_wrap_highlighter(HighlighterParameters params)
{
if (params.size() != 1)
throw runtime_error("wrong parameter count");
String col_expr = params[0];
auto func = [=](const Context& context, HighlightFlags flags,
DisplayBuffer& display_buffer, BufferRange)
{
ColumnCount column = -1;
try
{
column = str_to_int_ifp(expand(col_expr, context)).value_or(0) - 1;
}
catch (runtime_error& err)
{
write_to_debug_buffer(
format("Error evaluating highlight column expression: {}", err.what()));
}
if (column < 0)
return;
const Buffer& buffer = context.buffer();
const int tabstop = context.options()["tabstop"].get<int>();
const auto line_count = display_buffer.lines().size();
for (auto it = display_buffer.lines().begin();
it != display_buffer.lines().end(); ++it)
{
const LineCount buf_line = it->range().begin.line;
int line_split_count = 1;
const ByteCount line_length = buffer[buf_line].length();
auto get_coord = [&](ColumnCount c) {
auto col = get_byte_to_column(
buffer, tabstop, {buf_line, c});
return BufferCoord{buf_line, col};
};
auto coord = get_coord(column * line_split_count++);
if (buffer.is_valid(coord) and not buffer.is_end(coord))
{
for (auto atom_it = it->begin();
coord.column != line_length and atom_it != it->end(); )
{
if (!atom_it->has_buffer_range() or
coord < atom_it->begin() or coord >= atom_it->end())
{
++atom_it;
continue;
}
auto& line = *it;
if (coord > atom_it->begin())
atom_it = ++line.split(atom_it, coord);
if (buffer.next(coord) < atom_it->end())
atom_it = line.split(atom_it, buffer.next(coord));
DisplayLine new_line{ AtomList{ atom_it, line.end() } };
line.erase(atom_it, line.end());
it = display_buffer.lines().insert(it+1, new_line);
coord = get_coord(column * line_split_count++);
atom_it = it->begin();
}
}
}
display_buffer.lines().resize(line_count);
};
return {"wrap_" + params[0], make_simple_highlighter(std::move(func))};
}
void expand_tabulations(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer, BufferRange)
{
const ColumnCount tabstop = context.options()["tabstop"].get<int>();
@ -1574,6 +1648,11 @@ void register_highlighters()
{ create_column_highlighter,
"Parameters: <value string> <face>\n"
"Highlight the column given by evaluating <value string> with <face>" } });
registry.insert({
"wrap",
{ create_wrap_highlighter,
"Parameters: <value string>\n"
"Wrap lines to given column" } });
registry.insert({
"ref",
{ create_reference_highlighter,