fix(readline): use invert for completion highlight instead of hardcoded colors

api.go

@@ -325,6 +325,7 @@ func hlprompt(t *rt.Thread, c *rt.GoCont) (rt.Cont, error) {
 		return nil, err
 	}
 	typ := "left"
+	// optional 2nd arg
 	if len(c.Etc()) != 0 {
 		ltyp := c.Etc()[0]
 		var ok bool

readline/codes.go

@@ -85,6 +85,7 @@ const (
 	seqBold       = "\x1b[1m"
 	seqUnderscore = "\x1b[4m"
 	seqBlink      = "\x1b[5m"
+	seqInvert     = "\x1b[7m"
 )
 
 // Text colours

readline/comp-grid.go

@@ -121,7 +121,7 @@ func (g *CompletionGroup) writeGrid(rl *Instance) (comp string) {
 		}
 
 		if (x == g.tcPosX && y == g.tcPosY) && (g.isCurrent) {
-			comp += seqCtermFg255 + seqFgBlackBright
+			comp += seqInvert
 		}
 
 		comp += fmt.Sprintf("%-"+cellWidth+"s %s", g.Suggestions[i], seqReset)

readline/comp-list.go

@@ -188,7 +188,7 @@ func (g *CompletionGroup) writeList(rl *Instance) (comp string) {
 	// function highlights the cell depending on current selector place.
 	highlight := func(y int, x int) string {
 		if y == g.tcPosY && x == g.tcPosX && g.isCurrent {
-			return seqCtermFg255 + seqFgBlackBright
+			return seqInvert
 		}
 		return ""
 	}

readline/comp-map.go

@@ -101,7 +101,7 @@ func (g *CompletionGroup) writeMap(rl *Instance) (comp string) {
 	// Highlighting function
 	highlight := func(y int) string {
 		if y == g.tcPosY && g.isCurrent {
-			return seqCtermFg255 + seqFgBlackBright
+			return seqInvert
 		}
 		return ""
 	}