Jonathan Apodaca
a3330d5bd8
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NeoVim tests / plenary-tests (push) Successful in 49s
66 lines
2.0 KiB
Lua
66 lines
2.0 KiB
Lua
local tracker = require 'u.tracker'
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local Buffer = require 'u.buffer'
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local h = require('u.renderer').h
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-- Create an buffer for the UI
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vim.cmd.vnew()
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local ui_buf = Buffer.current()
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ui_buf:set_tmp_options()
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local s_count = tracker.create_signal(0, 'counter_signal')
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-- Effect: Render
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-- Setup the effect for rendering the UI whenever dependencies are updated
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tracker.create_effect(function()
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-- Calling `Signal:get()` in an effect registers the given signal as a
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-- dependency of the current effect. Whenever that signal (or any other
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-- dependency) changes, the effect will rerun. In this particular case,
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-- rendering the UI is an effect that depends on one signal.
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local count = s_count:get()
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-- Markup is hyperscript, which is just 1) text, and 2) tags (i.e.,
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-- constructed with `h(...)` calls). To help organize the markup, text and
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-- tags can be nested in tables at any depth. Line breaks must be specified
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-- manually, with '\n'.
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ui_buf:render {
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'Reactive Counter Example\n',
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'========================\n\n',
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{ 'Counter: ', tostring(count), '\n' },
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'\n',
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{
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h('text', {
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hl = 'DiffDelete',
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on_key = {
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['\r'] = function()
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-- Update the contents of the s_count signal, notifying any
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-- dependencies (in this case, the render effect):
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s_count:update(function(n) return n - 1 end)
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-- Also equivalent: s_count:set(s_count:get() - 1)
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return ''
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end,
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},
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}, ' Decrement '),
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' ',
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h('text', {
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hl = 'DiffAdd',
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on_key = {
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['\r'] = function()
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-- Update the contents of the s_count signal, notifying any
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-- dependencies (in this case, the render effect):
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s_count:update(function(n) return n + 1 end)
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-- Also equivalent: s_count:set(s_count:get() + 1)
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return ''
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end,
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},
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}, ' Increment '),
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},
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'\n',
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'\n',
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{ 'Press <CR> on each "button" above to increment/decrement the counter.' },
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}
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end)
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