lite-xl/data/plugins/drawwhitespace.lua

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-- mod-version:3
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local style = require "core.style"
local DocView = require "core.docview"
local common = require "core.common"
local config = require "core.config"
local Highlighter = require "core.doc.highlighter"
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config.plugins.drawwhitespace = common.merge({
enabled = true,
show_leading = true,
show_trailing = true,
show_middle = true,
show_middle_min = 1,
color = style.syntax.whitespace or style.syntax.comment,
leading_color = nil,
middle_color = nil,
trailing_color = nil,
substitutions = {
{
char = " ",
sub = "·",
-- You can put any of the previous options here too.
-- For example:
-- show_middle_min = 2,
-- show_leading = false,
},
{
char = "\t",
sub = "»",
},
},
config_spec = {
name = "Draw Whitespace",
{
label = "Enabled",
description = "Disable or enable the drawing of white spaces.",
path = "enabled",
type = "toggle",
default = true
},
{
label = "Show Leading",
description = "Draw whitespaces starting at the beginning of a line.",
path = "show_leading",
type = "toggle",
default = true,
},
{
label = "Show Middle",
description = "Draw whitespaces on the middle of a line.",
path = "show_middle",
type = "toggle",
default = true,
},
{
label = "Show Trailing",
description = "Draw whitespaces on the end of a line.",
path = "show_trailing",
type = "toggle",
default = true,
},
{
label = "Show Trailing as Error",
description = "Uses an error square to spot them easily, requires 'Show Trailing' enabled.",
path = "show_trailing_error",
type = "toggle",
default = false,
on_apply = function(enabled)
local found = nil
local substitutions = config.plugins.drawwhitespace.substitutions
for i, sub in ipairs(substitutions) do
if sub.trailing_error then
found = i
end
end
if found == nil and enabled then
table.insert(substitutions, {
char = " ",
sub = "",
show_leading = false,
show_middle = false,
show_trailing = true,
trailing_color = style.error,
trailing_error = true
})
elseif found ~= nil and not enabled then
table.remove(substitutions, found)
end
end
}
}
}, config.plugins.drawwhitespace)
local ws_cache
local cached_settings
local function reset_cache()
ws_cache = setmetatable({}, { __mode = "k" })
local settings = config.plugins.drawwhitespace
cached_settings = {
show_leading = settings.show_leading,
show_trailing = settings.show_trailing,
show_middle = settings.show_middle,
show_middle_min = settings.show_middle_min,
color = settings.color,
leading_color = settings.leading_color,
middle_color = settings.middle_color,
trailing_color = settings.trailing_color,
substitutions = settings.substitutions,
}
end
reset_cache()
local function reset_cache_if_needed()
local settings = config.plugins.drawwhitespace
if
not ws_cache or
cached_settings.show_leading ~= settings.show_leading
or cached_settings.show_trailing ~= settings.show_trailing
or cached_settings.show_middle ~= settings.show_middle
or cached_settings.show_middle_min ~= settings.show_middle_min
or cached_settings.color ~= settings.color
or cached_settings.leading_color ~= settings.leading_color
or cached_settings.middle_color ~= settings.middle_color
or cached_settings.trailing_color ~= settings.trailing_color
-- we assume that the entire table changes
or cached_settings.substitutions ~= settings.substitutions
then
reset_cache()
end
end
-- Move cache to make space for new lines
local prev_insert_notify = Highlighter.insert_notify
function Highlighter:insert_notify(line, n, ...)
prev_insert_notify(self, line, n, ...)
if not ws_cache[self] then
ws_cache[self] = {}
end
local to = math.min(line + n, #self.doc.lines)
for i=#self.doc.lines+n,to,-1 do
ws_cache[self][i] = ws_cache[self][i - n]
end
for i=line,to do
ws_cache[self][i] = nil
end
end
-- Close the cache gap created by removed lines
local prev_remove_notify = Highlighter.remove_notify
function Highlighter:remove_notify(line, n, ...)
prev_remove_notify(self, line, n, ...)
if not ws_cache[self] then
ws_cache[self] = {}
end
local to = math.max(line + n, #self.doc.lines)
for i=line,to do
ws_cache[self][i] = ws_cache[self][i + n]
end
end
-- Remove changed lines from the cache
local prev_update_notify = Highlighter.update_notify
function Highlighter:update_notify(line, n, ...)
prev_update_notify(self, line, n, ...)
if not ws_cache[self] then
ws_cache[self] = {}
end
for i=line,line+n do
ws_cache[self][i] = nil
end
end
local function get_option(substitution, option)
if substitution[option] == nil then
return config.plugins.drawwhitespace[option]
end
return substitution[option]
end
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local draw_line_text = DocView.draw_line_text
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function DocView:draw_line_text(idx, x, y)
if
not config.plugins.drawwhitespace.enabled
or
getmetatable(self) ~= DocView
then
return draw_line_text(self, idx, x, y)
end
local font = (self:get_font() or style.syntax_fonts["whitespace"] or style.syntax_fonts["comment"])
reset_cache_if_needed()
if
not ws_cache[self.doc.highlighter]
or ws_cache[self.doc.highlighter].font ~= font
then
ws_cache[self.doc.highlighter] = {font = font}
end
if not ws_cache[self.doc.highlighter][idx] then -- need to cache line
local cache = {}
local tx
local text = self.doc.lines[idx]
for _, substitution in pairs(config.plugins.drawwhitespace.substitutions) do
local char = substitution.char
local sub = substitution.sub
local offset = 1
local show_leading = get_option(substitution, "show_leading")
local show_middle = get_option(substitution, "show_middle")
local show_trailing = get_option(substitution, "show_trailing")
local show_middle_min = get_option(substitution, "show_middle_min")
local base_color = get_option(substitution, "color")
local leading_color = get_option(substitution, "leading_color") or base_color
local middle_color = get_option(substitution, "middle_color") or base_color
local trailing_color = get_option(substitution, "trailing_color") or base_color
local pattern = char.."+"
while true do
local s, e = text:find(pattern, offset)
if not s then break end
tx = self:get_col_x_offset(idx, s)
local color = base_color
local draw = false
if e == #text - 1 then
draw = show_trailing
color = trailing_color
elseif s == 1 then
draw = show_leading
color = leading_color
else
draw = show_middle and (e - s + 1 >= show_middle_min)
color = middle_color
end
if draw then
local last_cache_idx = #cache
-- We need to draw tabs one at a time because they might have a
-- different size than the substituting character.
-- This also applies to any other char if we use non-monospace fonts
-- but we ignore this case for now.
if char == "\t" then
for i = s,e do
tx = self:get_col_x_offset(idx, i)
cache[last_cache_idx + 1] = sub
cache[last_cache_idx + 2] = tx
cache[last_cache_idx + 3] = font:get_width(sub)
cache[last_cache_idx + 4] = color
last_cache_idx = last_cache_idx + 4
end
else
cache[last_cache_idx + 1] = string.rep(sub, e - s + 1)
cache[last_cache_idx + 2] = tx
cache[last_cache_idx + 3] = font:get_width(cache[last_cache_idx + 1])
cache[last_cache_idx + 4] = color
end
end
offset = e + 1
end
end
ws_cache[self.doc.highlighter][idx] = cache
end
-- draw from cache
local x1, _, x2, _ = self:get_content_bounds()
x1 = x1 + x
x2 = x2 + x
local cache = ws_cache[self.doc.highlighter][idx]
for i=1,#cache,4 do
local sub = cache[i]
local tx = cache[i + 1] + x
local tw = cache[i + 2]
local color = cache[i + 3]
if tx + tw >= x1 then
tx = renderer.draw_text(font, sub, tx, y, color)
end
if tx > x2 then break end
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end
return draw_line_text(self, idx, x, y)
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end