A Simple Implementation of ProgressBar

The ProgressBar is just a string which has a length equal to the
innerRect of the table. The length of the innerRect is considered to be
100% and the rest of the progress is tracked in relation to it.
The Progress is displayed with the help of the color formatting strings
in tview
       link: https://pkg.go.dev/github.com/rivo/tview#hdr-Colors

the progress length which is calculated by finding the percentage of the
innerRect that matches with the given completion and then at that length
the "[-:-:-]" is inserted with the help of the insertAt function in
utils.go. "[-:-:-]" represents resetting of colors.

progressBar.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"github.com/rivo/tview"
+	"github.com/gdamore/tcell/v2"
+	"github.com/fhs/gompd/mpd"
+	"strconv"
+)
+
+// The progressBar is just a string which is separated by the color formatting String
+// for e.g
+
+// "[:#fbff00:]******************`innerText`[-:-:-]                "
+
+// the above string shows represents the progress until [-:-:-]
+// [-:-:-] this string represents resetting colors so the substring before it would be with a
+// colored background. this is done by calculating the innerRect of the table and taking that length as
+// 100% and then representing the rest of the information in relation to it
+
+type progressBar struct{
+	t *tview.Table
+}
+
+// This Function returns a progressBar with a table of two rows
+// the First row will contain information about the current Song
+// and the Second one will contain the progressBar
+func newProgressBar(conn mpd.Client) *progressBar {
+	p := progressBar{}
+
+	a := tview.NewTable().
+			SetCell(0, 0, tview.NewTableCell("")).
+			SetCell(1, 0, tview.NewTableCell(""))
+
+	a.SetBorder(true)
+
+	a.SetDrawFunc(func( s tcell.Screen, x, y, width, height int) (int,int,int,int) {
+		p.updateTitle(conn)
+		p.updateProgress(conn)
+		return p.t.GetInnerRect()
+	})
+
+	p = progressBar{a}
+
+	return &p
+}
+
+func (s *progressBar) updateTitle(conn mpd.Client){
+	_currentAttributes, err := conn.CurrentSong()
+	if err == nil {
+		s.t.GetCell(0,0).Text = _currentAttributes["Artist"] + " - " +_currentAttributes["Title"]
+	}
+}
+
+func (s *progressBar) updateProgress(conn mpd.Client){
+	_status,err := conn.Status()
+	_, _, _width, _ := s.t.GetInnerRect()
+	el, err1 := strconv.ParseFloat(_status["elapsed"], 8)
+	du , err := strconv.ParseFloat(_status["duration"], 8)
+	percentage := el / du * 100
+	if err == nil && err1 == nil{
+		s.t.GetCell(1,0).Text = getText(float64(_width), percentage, convertToStrings(el) + "/" + convertToStrings(du) + "(" + strconv.FormatFloat(percentage, 'f', 2, 32) + "%" + ")")
+	}
+}

utils.go

@@ -0,0 +1,38 @@
+package main
+import(
+	"strings"
+	"strconv"
+)
+
+func convertToStrings(e float64) string{
+	a := int(e)
+	var min, seconds string
+	if (a/60 < 10){
+		min = "0"
+		min += strconv.Itoa(a/60)
+	} else {
+		min = strconv.Itoa(a/60)
+	}
+	if (a%60 < 10){
+		seconds = "0"
+		seconds += strconv.Itoa(a%60)
+	} else{
+		seconds = strconv.Itoa(a%60)
+	}
+	return min + ":" + seconds
+}
+
+func insertAt(inputString, stringTobeInserted string, index int) string{
+    s := inputString[:index] + stringTobeInserted + inputString[index:]
+	return s
+}
+
+func getText(width , percentage float64, eta string) string{
+	q := "[#000000:#ffffff]"
+	var a string
+	a += strings.Repeat(" ", int(width) - len(eta))
+	a = insertAt(a, eta, int(width/2) - 10)
+	a = insertAt(a, "[-:-:-]", int(width * percentage / 100))
+	q += a
+	return q
+}