handle resize events properly

app.go

@@ -191,7 +191,7 @@ func (app *app) runShell(s string, args []string, prefix string) {
 
 		app.ui.pause()
 		defer app.ui.resume()
-		defer app.nav.renew(app.ui.wins[0].h)
+		defer app.nav.renew()
 	case "%":
 		stdin, err := cmd.StdinPipe()
 		if err != nil {

colors.go

@@ -10,6 +10,8 @@ import (
 	"github.com/nsf/termbox-go"
 )
 
+const gAnsiColorResetMask = termbox.AttrBold | termbox.AttrUnderline | termbox.AttrReverse
+
 type colorEntry struct {
 	fg termbox.Attribute
 	bg termbox.Attribute

eval.go

@@ -84,10 +84,6 @@ func (e *setExpr) eval(app *app, args []string) {
 			app.ui.print("scrolloff: value should be a non-negative number")
 			return
 		}
-		max := app.ui.wins[0].h / 2
-		if n > max {
-			n = max
-		}
 		gOpts.scrolloff = n
 	case "tabstop":
 		n, err := strconv.Atoi(e.val)
@@ -327,7 +323,7 @@ func (e *callExpr) eval(app *app, args []string) {
 			app.ui.printf("put: %s", err)
 			return
 		}
-		app.nav.renew(app.nav.height)
+		app.nav.renew()
 		if err := sendRemote("send sync"); err != nil {
 			app.ui.printf("put: %s", err)
 		}
@@ -343,7 +339,7 @@ func (e *callExpr) eval(app *app, args []string) {
 	case "redraw":
 		app.ui.sync()
 		app.ui.renew()
-		app.ui.loadFile(app.nav)
+		app.nav.height = app.ui.wins[0].h
 	case "reload":
 		app.ui.sync()
 		app.ui.renew()

nav.go

@@ -208,7 +208,7 @@ func (dir *dir) find(name string, height int) {
 		}
 	}
 
-	edge := min(gOpts.scrolloff, len(dir.fi)-dir.ind-1)
+	edge := min(min(height/2, gOpts.scrolloff), len(dir.fi)-dir.ind-1)
 	dir.pos = min(dir.ind, height-edge-1)
 }
 
@@ -271,13 +271,12 @@ func (nav *nav) getDirs(wd string) {
 	nav.dirs = dirs
 }
 
-func (nav *nav) renew(height int) {
+func (nav *nav) renew() {
 	nav.dirCache = make(map[string]*dir)
 	for _, d := range nav.dirs {
 		nav.dirCache[d.path] = d
 	}
 
-	nav.height = height
 	for _, d := range nav.dirs {
 		go func(d *dir) {
 			s, err := os.Stat(d.path)
@@ -422,7 +421,7 @@ func (nav *nav) up(dist int) {
 	dir.ind = max(0, dir.ind)
 
 	dir.pos -= dist
-	edge := min(gOpts.scrolloff, dir.ind)
+	edge := min(min(nav.height/2, gOpts.scrolloff), dir.ind)
 	dir.pos = max(dir.pos, edge)
 }
 
@@ -439,7 +438,7 @@ func (nav *nav) down(dist int) {
 	dir.ind = min(maxind, dir.ind)
 
 	dir.pos += dist
-	edge := min(gOpts.scrolloff, maxind-dir.ind)
+	edge := min(min(nav.height/2, gOpts.scrolloff), maxind-dir.ind)
 
 	// use a smaller value when the height is even and scrolloff is maxed
 	// in order to stay at the same row as much as possible while up/down

ui.go

@@ -18,10 +18,7 @@ import (
 	"github.com/nsf/termbox-go"
 )
 
-const (
+const gEscapeCode = 27
-	gEscapeCode         = 27
-	gAnsiColorResetMask = termbox.AttrBold | termbox.AttrUnderline | termbox.AttrReverse
-)
 
 var gAnsiCodes = map[int]termbox.Attribute{
 	0:  termbox.ColorDefault,
@@ -433,7 +430,9 @@ func (ui *ui) renew() {
 		wacc += widths[i]
 	}
 
+	ui.promptWin.renew(wtot, 1, 0, 0)
 	ui.msgWin.renew(wtot, 1, 0, htot-1)
+	ui.menuWin.renew(wtot, 1, 0, htot-2)
 }
 
 func (ui *ui) print(msg string) {