Added progress bar

go.mod

@@ -5,6 +5,7 @@ go 1.13
 require (
 	github.com/atotto/clipboard v0.1.2
 	github.com/charmbracelet/bubbletea v0.12.2
+	github.com/lucasb-eyer/go-colorful v1.0.3
 	github.com/mattn/go-runewidth v0.0.9
 	github.com/muesli/termenv v0.7.4
 	golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897 // indirect

progress/progress.go

@@ -0,0 +1,91 @@
+package progress
+
+import (
+	"strings"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/lucasb-eyer/go-colorful"
+	"github.com/muesli/termenv"
+)
+
+// Value is explicit type of, you know, progression. Can be 0.0 < x < 1.0
+type Value float64
+
+type Model struct {
+	// Left side color of progress bar. By default, it's #00dbde
+	StartColor colorful.Color
+
+	// Left side color of progress bar. By default, it's #fc00ff
+	EndColor colorful.Color
+
+	// Length of progress bar in symbols.
+	Length int
+
+	// Which part of bar need to visualise. Can be 0.0 < Progress < 1.0, if value is bigger or smaller, it'll
+	// be mapped to this values
+	Progress float64
+
+	// filament rune of done part of progress bar. it's █ by default
+	FilamentSymbol rune
+
+	// empty rune of pending part of progress bar. it's ░ by default
+	EmptySymbol rune
+
+	// if true, gradient will be setted from start to end of filled part. Instead, it'll work
+	// on all proggress bar length
+	FullGradientMode bool
+}
+
+// NewModel returns a model with default values.
+func NewModel(size int) *Model {
+	startColor, _ := colorful.Hex("#00dbde")
+	endColor, _ := colorful.Hex("#fc00ff")
+	return &Model{
+		StartColor:     startColor,
+		EndColor:       endColor,
+		Length:         size,
+		FilamentSymbol: '█',
+		EmptySymbol:    '░',
+	}
+}
+
+func (m *Model) Init() tea.Cmd {
+	return nil
+}
+
+func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch cmd := msg.(type) {
+	case Value:
+		if cmd > 1 {
+			cmd = 1
+		}
+		if cmd < 0 {
+			cmd = 0
+		}
+
+		m.Progress = float64(cmd)
+	}
+
+	return m, nil
+}
+
+func (m *Model) View() string {
+	ramp := make([]string, int(float64(m.Length)*m.Progress))
+	for i := 0; i < len(ramp); i++ {
+		gradientPart := float64(m.Length)
+		if m.FullGradientMode {
+			gradientPart = float64(len(ramp))
+		}
+		percent := float64(i) / gradientPart
+		c := m.StartColor.BlendLuv(m.EndColor, percent)
+		ramp[i] = c.Hex()
+	}
+
+	var fullCells string
+	for i := 0; i < len(ramp); i++ {
+		fullCells += termenv.String(string(m.FilamentSymbol)).Foreground(termenv.ColorProfile().Color(ramp[i])).String()
+	}
+
+	fullCells += strings.Repeat(string(m.EmptySymbol), m.Length-len(ramp))
+	return fullCells
+}