Add 'scrollbarchar' option (#2342)

This lets you specify a character that will get used for rendering the
scrollbar.

Co-authored-by: Zachary Yedidia <zyedidia@gmail.com>

internal/config/settings.go

@@ -353,6 +353,9 @@ var DefaultGlobalOnlySettings = map[string]interface{}{
 	"multiopen":      "tab",
 	"parsecursor":    false,
 	"paste":          false,
+	"savehistory":    true,
+	"scrollbarchar":  "|",
+	"sucmd":          "sudo",
 	"pluginchannels": []string{"https://raw.githubusercontent.com/micro-editor/plugin-channel/master/channel.json"},
 	"pluginrepos":    []string{},
 	"savehistory":    true,

internal/display/bufwindow.go

@@ -767,8 +767,14 @@ func (w *BufWindow) displayScrollBar() {
 			scrollBarStyle = style
 		}
 
+		scrollBarChar := config.GetGlobalOption("scrollbarchar").(string)
+		if util.CharacterCountInString(scrollBarChar) != 1 {
+			scrollBarChar = "|"
+		}
+		scrollBarRune := []rune(scrollBarChar)
+
 		for y := barstart; y < util.Min(barstart+barsize, w.Y+w.bufHeight); y++ {
-			screen.SetContent(scrollX, y, '|', nil, scrollBarStyle)
+			screen.SetContent(scrollX, y, scrollBarRune[0], nil, scrollBarStyle)
 		}
 	}
 }

runtime/help/options.md

@@ -311,6 +311,10 @@ Here are the available options:
 
     default value: `false`
 
+* `scrollbarchar`: specifies the character used for displaying the scrollbar
+
+    default value: `|`
+
 * `scrollmargin`: margin at which the view starts scrolling when the cursor
    approaches the edge of the view.