add example/form.lua

examples/form.lua

@@ -0,0 +1,34 @@
+local h = require('u.renderer').h
+local Renderer = require('u.renderer').Renderer
+local tracker = require 'u.tracker'
+
+-- Create a new, temporary, buffer to the side:
+vim.cmd.vnew()
+vim.bo.buftype = 'nofile'
+vim.bo.bufhidden = 'wipe'
+vim.bo.buflisted = false
+local renderer = Renderer.new()
+
+-- Create two signals:
+local s_name = tracker.create_signal '[(name here)]'
+local s_age = tracker.create_signal '[(age here)]'
+
+-- Utility to trim brackets from strings:
+local function trimb(s) return (s:gsub('^%[(.*)%]$', '%1')) end
+
+-- Render effect that depends on the signals:
+tracker.create_effect(function()
+  local name = s_name:get()
+  local age = s_age:get()
+  renderer:render {
+    h.Type({}, '# Form Example'),
+    '\n\n',
+
+    { 'Name: ', h.Structure({ signal = s_name }, name) },
+    '\n',
+    { 'Age: ', h.Structure({ signal = s_age }, age) },
+
+    '\n\n',
+    { 'Hello, "', trimb(name), '", you are "', trimb(age), '" years old.' },
+  }
+end)