lite-hearted/data/plugins/autocomplete.lua

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2019-12-28 11:16:32 +00:00
local core = require "core"
local common = require "core.common"
local config = require "core.config"
local command = require "core.command"
local style = require "core.style"
local keymap = require "core.keymap"
local translate = require "core.doc.translate"
local RootView = require "core.rootview"
local DocView = require "core.docview"
local max_suggestions = 6
local symbols = {}
core.add_thread(function()
local cache = setmetatable({}, { __mode = "k" })
local function get_symbols(doc)
local i = 1
local s = {}
while i < #doc.lines do
for sym in doc.lines[i]:gmatch(config.symbol_pattern) do
s[sym] = true
end
i = i + 1
if i % 100 == 0 then coroutine.yield() end
end
return s
end
local function cache_is_valid(doc)
local c = cache[doc]
return c and c.last_change_id == doc:get_change_id()
end
while true do
-- lift all symbols from all docs
local t = {}
for _, doc in ipairs(core.docs) do
-- update the cache if the doc has changed since the last iteration
if not cache_is_valid(doc) then
cache[doc] = {
last_change_id = doc:get_change_id(),
symbols = get_symbols(doc)
}
end
-- update symbol set with doc's symbol set
for sym in pairs(cache[doc].symbols) do
t[sym] = true
end
coroutine.yield()
end
-- update symbols list
symbols = {}
for sym in pairs(t) do
table.insert(symbols, sym)
end
-- wait for next scan
local valid = true
while valid do
coroutine.yield(1)
for _, doc in ipairs(core.docs) do
if not cache_is_valid(doc) then
valid = false
end
end
end
end
end)
local partial = ""
local suggestions_idx = 1
local suggestions = {}
local last_active_view
local last_line, last_col
local function reset_suggestions()
suggestions_idx = 1
suggestions = {}
end
local function get_partial_symbol()
local doc = core.active_view.doc
local line2, col2 = doc:get_selection()
local line1, col1 = doc:position_offset(line2, col2, translate.start_of_word)
return doc:get_text(line1, col1, line2, col2)
end
local function get_active_view()
if getmetatable(core.active_view) == DocView then
last_active_view = core.active_view
return core.active_view
end
end
local function get_suggestions_rect(av)
if #suggestions == 0 then
return 0, 0, 0, 0
end
local line, col = av.doc:get_selection()
local x, y = av:get_line_screen_position(line)
x = x + av:get_col_x_offset(line, col - #partial)
y = y + av:get_line_height() + style.padding.y
local font = av:get_font()
local th = font:get_height()
local max_width = 0
for i, sym in ipairs(suggestions) do
max_width = math.max(max_width, font:get_width(sym))
end
return
x - style.padding.x,
y - style.padding.y,
max_width + style.padding.x * 2,
#suggestions * (th + style.padding.y) + style.padding.y
end
local function draw_suggestions_box(av)
-- draw background rect
local rx, ry, rw, rh = get_suggestions_rect(av)
renderer.draw_rect(rx, ry, rw, rh, style.background3)
-- draw text
local font = av:get_font()
local th = font:get_height()
local x, y = rx + style.padding.x, ry + style.padding.y
for i, sym in ipairs(suggestions) do
local color = (i == suggestions_idx) and style.accent or style.text
renderer.draw_text(font, sym, x, y, color)
y = y + th + style.padding.y
end
end
-- patch event logic into RootView
local on_text_input = RootView.on_text_input
local update = RootView.update
local draw = RootView.draw
RootView.on_text_input = function(...)
on_text_input(...)
local av = get_active_view()
if av then
-- update partial symbol and suggestions
partial = get_partial_symbol()
if #partial >= 3 then
local t = common.fuzzy_match(symbols, partial)
for i = 1, max_suggestions do
suggestions[i] = t[i]
end
last_line, last_col = av.doc:get_selection()
else
reset_suggestions()
end
-- scroll if rect is out of bounds of view
local _, y, _, h = get_suggestions_rect(av)
local limit = av.position.y + av.size.y
if y + h > limit then
av.scroll.to.y = av.scroll.y + y + h - limit
end
end
end
RootView.update = function(...)
update(...)
local av = get_active_view()
if av then
-- reset suggestions if caret was moved
local line, col = av.doc:get_selection()
if line ~= last_line or col ~= last_col then
reset_suggestions()
end
end
end
RootView.draw = function(...)
draw(...)
local av = get_active_view()
if av then
-- draw suggestions box after everything else
core.root_view:defer_draw(draw_suggestions_box, av)
end
end
local function predicate()
return get_active_view() and #suggestions > 0
end
command.add(predicate, {
["autocomplete:complete"] = function()
local doc = core.active_view.doc
local line, col = doc:get_selection()
local text = suggestions[suggestions_idx]
doc:insert(line, col, text)
doc:remove(line, col, line, col - #partial)
doc:set_selection(line, col + #text - #partial)
reset_suggestions()
end,
["autocomplete:previous"] = function()
suggestions_idx = math.max(suggestions_idx - 1, 1)
end,
["autocomplete:next"] = function()
suggestions_idx = math.min(suggestions_idx + 1, #suggestions)
end,
["autocomplete:cancel"] = function()
reset_suggestions()
end,
})
keymap.add {
["tab"] = "autocomplete:complete",
["up"] = "autocomplete:previous",
["down"] = "autocomplete:next",
["escape"] = "autocomplete:cancel",
}