Add Wrap Scroll functionality. Fixes #126 (#166)

complete.go

@@ -108,6 +108,9 @@ var (
 		"wrapscan",
 		"nowrapscan",
 		"wrapscan!",
+		"wrapscroll",
+		"nowrapscroll",
+		"wrapscroll!",
 		"number",
 		"nonumber",
 		"number!",

doc.go

@@ -111,6 +111,7 @@ The following options can be used to customize the behavior of lf:
     smartcase       boolean  (default on)
     smartdia        boolean  (default off)
     wrapscan        boolean  (default on)
+    wrapscroll      boolean  (default off)
     number          boolean  (default off)
     relativenumber  boolean  (default off)
     findlen         integer  (default 1) (zero to prompt until single match)

docstring.go

@@ -114,6 +114,7 @@ The following options can be used to customize the behavior of lf:
     smartcase       boolean  (default on)
     smartdia        boolean  (default off)
     wrapscan        boolean  (default on)
+    wrapscroll      boolean  (default off)
     number          boolean  (default off)
     relativenumber  boolean  (default off)
     findlen         integer  (default 1) (zero to prompt until single match)

eval.go

@@ -143,6 +143,12 @@ func (e *setExpr) eval(app *app, args []string) {
 		gOpts.wrapscan = false
 	case "wrapscan!":
 		gOpts.wrapscan = !gOpts.wrapscan
+	case "wrapscroll":
+		gOpts.wrapscroll = true
+	case "nowrapscroll":
+		gOpts.wrapscroll = false
+	case "wrapscroll!":
+		gOpts.wrapscroll = !gOpts.wrapscroll
 	case "number":
 		gOpts.number = true
 	case "nonumber":

lf.1

@@ -126,6 +126,7 @@ The following options can be used to customize the behavior of lf:
     smartcase       boolean  (default on)
     smartdia        boolean  (default off)
     wrapscan        boolean  (default on)
+    wrapscroll      boolean  (default off)
     number          boolean  (default off)
     relativenumber  boolean  (default off)
     findlen         integer  (default 1) (zero to prompt until single match)

nav.go

@@ -445,6 +445,9 @@ func (nav *nav) up(dist int) {
 	dir := nav.currDir()
 
 	if dir.ind == 0 {
+		if gOpts.wrapscroll {
+			nav.bottom()
+		}
 		return
 	}
 
@@ -462,6 +465,9 @@ func (nav *nav) down(dist int) {
 	maxind := len(dir.files) - 1
 
 	if dir.ind >= maxind {
+		if gOpts.wrapscroll {
+			nav.top()
+		}
 		return
 	}
 

opts.go

@@ -37,6 +37,7 @@ var gOpts struct {
 	ignoredia      bool
 	smartdia       bool
 	wrapscan       bool
+	wrapscroll     bool
 	number         bool
 	relativenumber bool
 	findlen        int
@@ -72,6 +73,7 @@ func init() {
 	gOpts.ignoredia = false
 	gOpts.smartdia = false
 	gOpts.wrapscan = true
+	gOpts.wrapscroll = false
 	gOpts.number = false
 	gOpts.relativenumber = false
 	gOpts.findlen = 1