Allow divider customization with divchars option

Adds the `divchars` and `divreverse` options to customize divider
styles.

internal/config/settings.go

@@ -248,6 +248,8 @@ func DefaultCommonSettings() map[string]interface{} {
 var DefaultGlobalOnlySettings = map[string]interface{}{
 	"autosave":       float64(0),
 	"colorscheme":    "default",
+	"divchars":       "|-",
+	"divreverse":     true,
 	"infobar":        true,
 	"keymenu":        false,
 	"mouse":          true,

internal/display/bufwindow.go

@@ -682,8 +682,27 @@ func (w *BufWindow) displayStatusLine() {
 		w.sline.Display()
 	} else if w.Y+w.Height != infoY {
 		w.drawStatus = true
+
+		divchars := config.GetGlobalOption("divchars").(string)
+		if util.CharacterCountInString(divchars) != 2 {
+			divchars = "|-"
+		}
+
+		_, _, size := util.DecodeCharacterInString(divchars)
+		divchar, combc, _ := util.DecodeCharacterInString(divchars[size:])
+
+		dividerStyle := config.DefStyle
+		if style, ok := config.Colorscheme["divider"]; ok {
+			dividerStyle = style
+		}
+
+		divreverse := config.GetGlobalOption("divreverse").(bool)
+		if divreverse {
+			dividerStyle = dividerStyle.Reverse(true)
+		}
+
 		for x := w.X; x < w.X+w.Width; x++ {
-			screen.SetContent(x, w.Y+w.Height-1, '-', nil, config.DefStyle.Reverse(true))
+			screen.SetContent(x, w.Y+w.Height-1, divchar, combc, dividerStyle)
 		}
 	} else {
 		w.drawStatus = false

internal/display/uiwindow.go

@@ -4,6 +4,7 @@ import (
 	"github.com/zyedidia/micro/v2/internal/buffer"
 	"github.com/zyedidia/micro/v2/internal/config"
 	"github.com/zyedidia/micro/v2/internal/screen"
+	"github.com/zyedidia/micro/v2/internal/util"
 	"github.com/zyedidia/micro/v2/internal/views"
 )
 
@@ -24,11 +25,23 @@ func (w *UIWindow) drawNode(n *views.Node) {
 		dividerStyle = style
 	}
 
+	divchars := config.GetGlobalOption("divchars").(string)
+	if util.CharacterCountInString(divchars) != 2 {
+		divchars = "|-"
+	}
+
+	divchar, combc, _ := util.DecodeCharacterInString(divchars)
+
+	divreverse := config.GetGlobalOption("divreverse").(bool)
+	if divreverse {
+		dividerStyle = dividerStyle.Reverse(true)
+	}
+
 	for i, c := range cs {
 		if c.IsLeaf() && c.Kind == views.STVert {
 			if i != len(cs)-1 {
 				for h := 0; h < c.H; h++ {
-					screen.SetContent(c.X+c.W, c.Y+h, '|', nil, dividerStyle.Reverse(true))
+					screen.SetContent(c.X+c.W, c.Y+h, divchar, combc, dividerStyle)
 				}
 			}
 		} else {