feat(ui): make progress bar TTY-aware (use golang.org/x/term)

Author: Urethramancer

go.mod

@@ -17,4 +17,5 @@ require (
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-runewidth v0.0.21 // indirect
 	golang.org/x/sys v0.42.0 // indirect
+	golang.org/x/term v0.41.0 // indirect
 )

go.sum

@@ -21,3 +21,5 @@ github.com/mattn/go-runewidth v0.0.21/go.mod h1:XBkDxAl56ILZc9knddidhrOlY5R/pDhg
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.42.0 h1:omrd2nAlyT5ESRdCLYdm3+fMfNFE/+Rf4bDIQImRJeo=
 golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/term v0.41.0 h1:QCgPso/Q3RTJx2Th4bDLqML4W6iJiaXFq2/ftQF13YU=
+golang.org/x/term v0.41.0/go.mod h1:3pfBgksrReYfZ5lvYM0kSO0LIkAl4Yl2bXOkKP7Ec2A=

scan.go

@@ -89,7 +89,9 @@ func scanDir(dir string) ([]*Duplicates, error) {
 	})
 
 	bar := pb.New64(total)
-	if flags.Verbose {
+	// show the bar only when verbose and running on a TTY
+	showBar := flags.Verbose && isTerminal()
+	if showBar {
 		bar.Set(pb.Bytes, false)
 		bar.Start()
 	}

term.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"os"
+
+	"golang.org/x/term"
+)
+
+// isTerminal returns true when stdout is a terminal
+func isTerminal() bool {
+	fd := int(os.Stdout.Fd())
+	return term.IsTerminal(fd)
+}