mirror of
https://github.com/lune-org/lune.git
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226 lines
5 KiB
Lua
226 lines
5 KiB
Lua
--> A walkthrough of all of the basic Lune features.
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print("Hello, lune! 🌙")
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--[==[
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EXAMPLE #1
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Using a function from another module
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]==]
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local module = require("./modules/module")
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module.sayHello()
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--[==[
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EXAMPLE #2
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Using arguments given to the program
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]==]
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if #process.args > 0 then
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print("\nGot arguments while running hello_lune:")
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console.log(process.args)
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if #process.args > 3 then
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error("Too many arguments!")
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end
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end
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--[==[
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EXAMPLE #3
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Spawning tasks
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]==]
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task.spawn(function()
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print("\nSpawned a task that will run instantly but not block")
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task.wait(5)
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end)
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print("Spawning a delayed task that will run in 5 seconds")
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task.delay(5, function()
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print("\n...")
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task.wait(1)
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print("Hello again!")
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task.wait(1)
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print("Goodbye again! 🌙")
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end)
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--[==[
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EXAMPLE #4
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Get & set environment variables
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Checks if environment variables are empty or not,
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prints out ❌ if empty and ✅ if they have a value
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]==]
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print("\nReading current environment 🔎")
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-- Environment variables can be read directly
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assert(process.env.PATH ~= nil, "Missing PATH")
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assert(process.env.PWD ~= nil, "Missing PWD")
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-- And they can also be accessed using generalized iteration (not pairs!)
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for key, value in process.env do
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local box = if value and value ~= "" then "✅" else "❌"
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print(string.format("[%s] %s", box, key))
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end
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--[==[
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EXAMPLE #5
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Read files in the current directory
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This prints out directory & file names with some fancy icons
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]==]
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print("\nReading current dir 🗂️")
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local entries = fs.readDir(".")
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-- NOTE: We have to do this outside of the sort function
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-- to avoid yielding across the metamethod boundary, any
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-- calls to fs functions may yield for any reason
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local entryIsDir = {}
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for _, entry in entries do
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entryIsDir[entry] = fs.isDir(entry)
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end
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-- Sort prioritizing directories first, then alphabetically
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table.sort(entries, function(entry0, entry1)
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if entryIsDir[entry0] ~= entryIsDir[entry1] then
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return entryIsDir[entry0]
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end
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return entry0 < entry1
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end)
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-- Make sure we got some known files that should always exist
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assert(table.find(entries, "Cargo.toml") ~= nil, "Missing Cargo.toml")
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assert(table.find(entries, "Cargo.lock") ~= nil, "Missing Cargo.lock")
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-- Print the pretty stuff
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for _, entry in entries do
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if fs.isDir(entry) then
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print("📁 " .. entry)
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else
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print("📄 " .. entry)
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end
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end
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-- NOTE: We skip the ping example in GitHub Actions
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-- since the ping command does not work in azure
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if not process.env.GITHUB_ACTIONS then
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--[==[
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EXAMPLE #6
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Call out to another program / executable
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Here we send some pings to google to demonstrate that programs
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that yield or perform any network requests work correctly
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]==]
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print("\nSending 4 pings to google 🌏")
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local result = process.spawn("ping", {
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"google.com",
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"-c 4",
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})
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--[==[
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EXAMPLE #7
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Using the result of a spawned process, exiting the process
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We use the result from the above ping command and parse
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it to show the results it gave us in a nicer format, here we
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also exit with an error (exit code 1) if spawning the process failed
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]==]
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if result.ok then
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assert(#result.stdout > 0, "Result output was empty")
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local min, avg, max, stddev = string.match(
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result.stdout,
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"min/avg/max/stddev = ([%d%.]+)/([%d%.]+)/([%d%.]+)/([%d%.]+) ms"
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)
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print(string.format("Minimum ping time: %.3fms", assert(tonumber(min))))
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print(string.format("Maximum ping time: %.3fms", assert(tonumber(max))))
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print(string.format("Average ping time: %.3fms", assert(tonumber(avg))))
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print(string.format("Standard deviation: %.3fms", assert(tonumber(stddev))))
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else
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print("\nFailed to send ping to google!")
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print(result.stderr)
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process.exit(result.code)
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end
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end
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--[==[
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EXAMPLE #8
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Using the built-in networking library
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]==]
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print("\nSending PATCH request to web API 📤")
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local apiResult = net.request({
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url = "https://jsonplaceholder.typicode.com/posts/1",
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method = "PATCH",
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headers = {
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["Content-Type"] = "application/json",
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},
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body = net.jsonEncode({
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title = "foo",
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body = "bar",
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}),
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})
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if not apiResult.ok then
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print("\nFailed to send network request!")
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print(string.format("%d (%s)", apiResult.statusCode, apiResult.statusMessage))
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print(apiResult.body)
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process.exit(1)
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end
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type ApiResponse = {
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id: number,
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title: string,
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body: string,
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userId: number,
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}
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local apiResponse: ApiResponse = net.jsonDecode(apiResult.body)
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assert(apiResponse.title == "foo", "Invalid json response")
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assert(apiResponse.body == "bar", "Invalid json response")
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print("Got valid JSON response with changes applied")
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--[==[
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EXAMPLE #9
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Using the console library to print pretty
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]==]
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print("\nPrinting with pretty colors and auto-formatting 🎨")
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console.setColor("blue")
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print(string.rep("—", 22))
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console.resetColor()
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console.info("API response:", apiResponse)
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console.warn({
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Oh = {
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No = {
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TooMuch = {
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Nesting = {
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"Will not print",
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},
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},
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},
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},
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})
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console.setColor("blue")
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print(string.rep("—", 22))
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console.resetColor()
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--[==[
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EXAMPLE #10
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Saying goodbye 😔
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]==]
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print("\nGoodbye, lune! 🌙")
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