hello.go

package main

import (
	"fmt"

	"github.com/gdamore/tcell"
	"github.com/rivo/tview"
)

var (
	app      *tview.Application // The tview application.
	pages    *tview.Pages
	textView *tview.TextView
	menu     *tview.List
)

const about = `[::bu]Hi, I'm Andy[::-] 👋

Coming from the international news broadcasting background, I performed a drastic career change at the age of 30 to become a full-stack web developer, thanks to Le Wagon bootcamp in Paris and Vrije Universiteit Amsterdam (CS department).

Now based in Berlin and employed full-time by Le Wagon, I help shape the education process in the bootcamp and work as a back-end and DevOps engineer on our learning platforms. I use (and teach) Ruby on Rails, Docker, and Kubernetes every day.

I have never severed my ties to journalism, so I also hold the position of Lead Writer at Evil Martians, the extraterrestrial product development consultancy.

[::bu]Le Wagon Berlin[::-] https://www.lewagon.com/berlin
[::bu]Evil Martians[::-] https://www.evilmartians.com
[::bu]Martian Chronicles[::-] https://www.evilmartians.com/blog
[::bu]Twitter[::-] https://twitter.com/progapandist
[::bu]Github[::-] https://github.com/progapandist

This is my personal website with a "frontend" built entirely in Go.
`
const cv = `[::bu]My career in a gist[::-] 👨‍💼

* I got my first proper [::b]job in tech[::-] in the year 2000, at the very early age of 15, as a technical editor at [::b]Yandex[::-].

* In 2003, I switched to [::b]broadcast journalism[::-], and worked as an editor, reporter, foreign correspondent, and chief of European bureau for [::b]13 years[::-], covering events from car expos to local conflicts. While working, I graduated from the [::b]Moscow State University[::-], Department of Journalism (5-year degree). 

* In 2015, I started [::b]teaching myself programming[::-], covering Python, C, Objective-C, and Swift. I went through Full-Stack Development Bootcamp at Le Wagon in Paris where I fell in love with [::b]Ruby on Rails[::-]. After my graduation, I moved to Amsterdam where I attended first two years of a Bachelor Degree in Computer Science at VU, spending time with C++ and Java. 

* Since then, I've been working on various Rails applications for companies and private clients. 

* I currently live and work in [::b]Berlin[::-], shaping the educational process at [::b]Le Wagon[::-] and writing Ruby, JavaScript, and Go code that allows our students to learn better. I am also managing [::b]Kubernetes[::-] deploys and set up local environments with [::b]Docker[::-].
`

const how = `[::bu]How it's built[::-] 👷‍♀️

* A Svelte front-end app uses Xterm.js to emulate terminal

* A Golang server establishes a Websocket connection to front-end

* An Alpine container starts in the backend

* A Golang binary in the container renders TUI

* Stdin and stdout of a container are piped back and forth through Websocket

The app is open-source, feel free to use it for your own inspiration: https://github.com/progapandist/progapanda.org

`

const why = `[::bu]But... Why?[::-] 🤔

I am obsessed with terminals and TUI programming, that's why! 

To be serious though, this is a part of my research project for creating a highly scalable interactive learning environment for programming students.

This application is deployed on a single Digital Ocean VPS that is turned into a Kuberenetes cluster with k3s.
`

func main() {
	app = tview.NewApplication()

	textView = tview.NewTextView().
		SetDynamicColors(true)
	textView.SetBorder(true)
	textView.SetBorderPadding(1, 1, 2, 1)
	textView.SetWrap(true).SetWordWrap(true)
	textView.SetBackgroundColor(tcell.Color19)

	textView.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		if event.Key() == tcell.KeyESC {
			app.SetFocus(menu)
		}
		return event
	})

	menu = tview.NewList().ShowSecondaryText(false)
	menu.SetBorder(true).SetTitle("Menu")
	menu.SetWrapAround(true).SetHighlightFullLine(true)
	menu.SetBorderPadding(1, 1, 2, 1)
	menu.SetSelectedBackgroundColor(tcell.ColorWhite)
	menu.SetBackgroundColor(tcell.Color19)

	menu.
		AddItem(" [::b]Hello", "", 0, func() {
			app.SetFocus(textView)
		}).
		AddItem(" [::b]CV", "", 0, func() {
			app.SetFocus(textView)
		}).
		AddItem(" [::b]How", "", 0, func() {
			app.SetFocus(textView)
		}).
		AddItem(" [::b]Why", "", 0, func() {
			app.SetFocus(textView)
		}).
		AddItem(" [::b]Quit", "", 0, func() {
			app.Stop()
		})

	menu.SetChangedFunc(func(i int, mt, st string, sc rune) {
		switch i {
		case 0:
			printAbout()
		case 1:
			printCv()
		case 2:
			printHow()
		case 3:
			printWhy()
		}
	})

	printAbout()

	flex := tview.NewFlex().
		AddItem(menu, 0, 1, true).
		AddItem(textView, 0, 5, false)

	flexFrame := tview.NewFrame(flex).
		AddText(
			" [::b](c) 2020, Andy B.[::-] [::b]Up/Down[::-]: Navigate, [::b]Enter[::-]: Open item, [::b]Esc[::-]: Back to Menu",
			false,
			tview.AlignLeft,
			tcell.ColorWhite).
		SetBorders(0, 1, 0, 0, 0, 0)

	pages = tview.NewPages().
		AddPage("layout", flexFrame, true, true)

	app.SetRoot(pages, true).SetFocus(menu).EnableMouse(true).Run()
}

func printAbout() {
	textView.Clear()
	fmt.Fprintf(textView, "%s ", about)
	textView.ScrollToBeginning()
	textView.SetTitle("Hello")
}

func printCv() {
	textView.Clear()
	fmt.Fprintf(textView, "%s ", cv)
	textView.SetTitle("CV")
}

func printHow() {
	textView.Clear()
	fmt.Fprintf(textView, "%s ", how)
	textView.SetTitle("How")
}

func printWhy() {
	textView.Clear()
	fmt.Fprintf(textView, "%s ", why)
	textView.SetTitle("Why")
}