init project structure + created a small demo using tview (about to remove it since it does almost everyhting and it is not suitable for learning purposes)

Author: Massiles Ghernaout

.gitignore

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+bin/*
+.env
+.env.local

BINARY_NAME

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+eddy

Makefile

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+
+VERSION:=$(shell cat ./VERSION)
+BINARY_NAME:=$(shell cat ./BINARY_NAME)
+AUTHOR:="Massiles Ghernaout"
+
+
+info: 
+	@echo "Project: ${BINARY_NAME}@${VERSION}"
+	@echo "Author: ${AUTHOR}"
+
+clean:
+	rm -rf bin/*
+
+bin: 
+	go build -ldflags "-X main.version=${VERSION} -X main.binary_name=${BINARY_NAME}" cmd/main.go -o bin/${BINARY_NAME}
+
+
+binstatic:
+	rm -rf bin/*
+	@echo "Building a static executable..."
+	CGO_ENABLED=0 go build -a -tags netgo,osusergo -ldflags "-X main.version=${VERSION} -X main.binary_name=${BINARY_NAME} -extldflags '-static -s -w'" -o bin/${BINARY_NAME} cmd/main.go
+
+run: 
+	./bin/${BINARY_NAME}
+
+runsrc:
+	CURR_DEV_ENV=dev go run ./cmd/main.go
+
+
+install:
+	@echo "(Makefile): Not implemented yet."
+
+
+uninstall:
+	@echo "(Makefile): Not implemented yet."

VERSION

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+v0.1.0

cmd/main.go

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+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+// will be populated by the build command
+var version string
+var binary_name string
+
+func main() {
+	if os.Getenv("CURR_DEV_ENV") == "dev" {
+		version = "v0.1.0"
+		binary_name = "eddy"
+	}
+
+	app := tview.NewApplication()
+
+	rootDir := "."
+	root := tview.NewTreeNode(rootDir).
+		SetColor(tcell.ColorRed)
+	tree := tview.NewTreeView().
+		SetRoot(root).
+		SetCurrentNode(root)
+
+	tree.SetBorder(true)
+
+	// A helper function which adds the files and directories of the given path
+	// to the given target node.
+	add := func(target *tview.TreeNode, path string) {
+		// TODO: add a check for files
+		files, err := os.ReadDir(path)
+		if err != nil {
+			fmt.Printf("err: %s\n", err.Error())
+		}
+		for _, file := range files {
+			node := tview.NewTreeNode(file.Name()).
+				SetReference(filepath.Join(path, file.Name())).
+				SetSelectable(true)
+				// SetSelectable(file.IsDir())
+			if file.IsDir() {
+				node.SetColor(tcell.ColorGreen)
+			} else {
+				node.SetSelectedFunc(func() {
+					node.SetText(node.GetText() + " selected")
+				})
+			}
+			target.AddChild(node)
+		}
+	}
+
+	// Add the current directory to the root node.
+	add(root, rootDir)
+
+	// If a directory was selected, open it.
+	tree.SetSelectedFunc(func(node *tview.TreeNode) {
+		reference := node.GetReference()
+		if reference == nil {
+			return // Selecting the root node does nothing.
+		}
+		children := node.GetChildren()
+		if len(children) == 0 {
+			// Load and show files in this directory.
+			path := reference.(string)
+			add(node, path)
+		} else {
+			// Collapse if visible, expand if collapsed.
+			node.SetExpanded(!node.IsExpanded())
+		}
+	})
+
+	textArea := tview.NewTextArea()
+	textArea.SetTitle(fmt.Sprintf("%s@%s", binary_name, version)).SetBorder(true)
+
+	helpInfo := tview.NewTextView().SetText("Press F1 for help, press Ctrl-C to exit")
+
+	position := tview.NewTextView().SetDynamicColors(true).SetTextAlign(tview.AlignRight)
+	pages := tview.NewPages()
+
+	textArea.SetMovedFunc(func() { updateCursorInfo(position, textArea) })
+	updateCursorInfo(position, textArea)
+
+	mainView := tview.NewGrid().
+		SetRows(0, 1).
+		AddItem(tree, 0, 0, 1, 1, 0, 0, false).
+		AddItem(textArea, 0, 1, 1, 2, 0, 0, true).
+		AddItem(helpInfo, 1, 0, 1, 1, 0, 0, false).
+		AddItem(position, 1, 2, 1, 1, 0, 0, false)
+
+	help1 := tview.NewTextView().
+		SetDynamicColors(true).
+		SetText(`[green]Navigation
+
+[yellow]Left arrow[white]: Move left.
+[yellow]Right arrow[white]: Move right.
+[yellow]Down arrow[white]: Move down.
+[yellow]Up arrow[white]: Move up.
+[yellow]Ctrl-A, Home[white]: Move to the beginning of the current line.
+[yellow]Ctrl-E, End[white]: Move to the end of the current line.
+[yellow]Ctrl-F, page down[white]: Move down by one page.
+[yellow]Ctrl-B, page up[white]: Move up by one page.
+[yellow]Alt-Up arrow[white]: Scroll the page up.
+[yellow]Alt-Down arrow[white]: Scroll the page down.
+[yellow]Alt-Left arrow[white]: Scroll the page to the left.
+[yellow]Alt-Right arrow[white]:  Scroll the page to the right.
+[yellow]Alt-B, Ctrl-Left arrow[white]: Move back by one word.
+[yellow]Alt-F, Ctrl-Right arrow[white]: Move forward by one word.
+
+[blue]Press Enter for more help, press Escape to return.`,
+		)
+
+	help2 := tview.NewTextView().
+		SetDynamicColors(true).
+		SetText(`[green]Editing[white]
+
+Type to enter text.
+[yellow]Ctrl-H, Backspace[white]: Delete the left character.
+[yellow]Ctrl-D, Delete[white]: Delete the right character.
+[yellow]Ctrl-K[white]: Delete until the end of the line.
+[yellow]Ctrl-W[white]: Delete the rest of the word.
+[yellow]Ctrl-U[white]: Delete the current line.
+
+[blue]Press Enter for more help, press Escape to return.`,
+		)
+
+	help3 := tview.NewTextView().
+		SetDynamicColors(true).
+		SetText(`[green]Selecting Text[white]
+
+Move while holding Shift or drag the mouse.
+Double-click to select a word.
+
+[green]Clipboard
+
+[yellow]Ctrl-Q[white]: Copy.
+[yellow]Ctrl-X[white]: Cut.
+[yellow]Ctrl-V[white]: Paste.
+		
+[green]Undo
+
+[yellow]Ctrl-Z[white]: Undo.
+[yellow]Ctrl-Y[white]: Redo.
+
+[blue]Press Enter for more help, press Escape to return.`,
+		)
+
+	help := tview.NewFrame(help1).SetBorders(1, 1, 0, 0, 2, 2)
+
+	help.SetBorder(true).
+		SetTitle("Help").
+		SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+			if event.Key() == tcell.KeyEscape {
+				pages.SwitchToPage("main")
+				return nil
+			} else if event.Key() == tcell.KeyEnter {
+				switch { // can use an array and the modulo operator
+				case help.GetPrimitive() == help1:
+					help.SetPrimitive(help2)
+				case help.GetPrimitive() == help2:
+					help.SetPrimitive(help3)
+				case help.GetPrimitive() == help3:
+					help.SetPrimitive(help1)
+				}
+				return nil
+			}
+			return event
+		})
+
+	pages.AddAndSwitchToPage("main", mainView, true).
+		AddPage("help", tview.NewGrid().
+			SetColumns(0, 64, 0).
+			SetRows(0, 22, 0).
+			AddItem(help, 1, 1, 1, 1, 0, 0, true), true, false)
+
+	app.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyF1 {
+			pages.ShowPage("help") //TODO: Check when clicking outside help window with the mouse. Then clicking help again.
+			return nil
+		}
+		return event
+	})
+
+	if err := app.SetRoot(pages,
+		true).EnableMouse(true).Run(); err != nil {
+		panic(err)
+	}
+}
+func updateCursorInfo(position *tview.TextView, textArea *tview.TextArea) {
+	fromRow, fromColumn, toRow, toColumn := textArea.GetCursor()
+	if fromRow == toRow && fromColumn == toColumn {
+		position.SetText(fmt.Sprintf("Row: [yellow]%d[white], Column: [yellow]%d ", fromRow, fromColumn))
+	} else {
+		position.SetText(fmt.Sprintf("[red]From[white] Row: [yellow]%d[white], Column: [yellow]%d[white] - [red]To[white] Row: [yellow]%d[white], To Column: [yellow]%d ", fromRow, fromColumn, toRow, toColumn))
+	}
+}

todo.txt

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+- Extract the messages to an external resource file to be able to add i18n