From 1f15111c6e44ea7e855fadc187a19234640e161c Mon Sep 17 00:00:00 2001
From: Syndamia <kamen.d.mladenov@protonmail.com>
Date: Thu, 22 Jul 2021 10:24:21 +0300
Subject: Improved structure and added comments

---
 go-src/windowsHelpers.go | 70 +++++++++++++++++++-----------------------------
 1 file changed, 27 insertions(+), 43 deletions(-)

(limited to 'go-src/windowsHelpers.go')

diff --git a/go-src/windowsHelpers.go b/go-src/windowsHelpers.go
index 13cb3c1..909a673 100644
--- a/go-src/windowsHelpers.go
+++ b/go-src/windowsHelpers.go
@@ -1,70 +1,54 @@
 package ctfc
 
 import (
-	"fmt"
-	"os"
-	"os/exec"
-	"runtime"
 	"time"
 
+	"gitlab.com/Syndamia/ctfc/go-src/csi"
+	ctfcmath "gitlab.com/Syndamia/ctfc/go-src/ctfcMath"
 	"gitlab.com/Syndamia/ctfc/go-src/ui"
-	"gitlab.com/Syndamia/ctfc/go-src/utils"
 )
 
+/* Pagination */
+
+const pageSize = 15
+
+func totalPages(messageAmount int) int {
+	return ctfcmath.CeilDivInt(messageAmount, pageSize)
+}
+
+func paginate(page int, messages ...string) []string {
+	return messages[ctfcmath.MaxInt(len(messages)-pageSize*page, 0) : len(messages)-pageSize*(page-1)]
+}
+
+// Must be run in a routine ( go routinePaginatedSubwindow(...) )
+// There must be empty lines for the subwindow
 func routinePaginatedSubwindow(messages *[]string, updateMessages func(*[]string), lastLine *int, page int) {
 	for *lastLine > -1 {
+		// Update messages, if we've already shown the last message
 		if *lastLine == len(*messages)-1 {
 			updateMessages(messages)
 			continue
 		}
 
 		*lastLine = len(*messages) - 1
-		fmt.Print("\033[s")
+		csi.SaveCursorPosition()
 
-		moveCursorUp(utils.PageSize + 2)
+		csi.MoveCursorUpN(pageSize + 2) // +2 because of the input and pagination lines
+		csi.MoveCursorToBeginningOfLine()
 
-		pageMessages := utils.Paginate(page, *messages...)
-		for i := 0; i < utils.PageSize-len(pageMessages); i++ {
-			ui.EmptyLine()
+		pageMessages := paginate(page, *messages...)
+		// Leaves empty lines at the top, if there aren't enough messages to fill a full page
+		for i := 0; i < pageSize-len(pageMessages); i++ {
+			csi.MoveCursorDown()
 		}
 		for _, v := range pageMessages {
-			fmt.Print("\033[K")
+			csi.ClearLine()
 			ui.TextField(v)
 		}
 
-		ui.PageField(page, utils.TotalPages(len(*messages)))
+		ui.PageField(page, totalPages(len(*messages)))
 
-		fmt.Print("\033[u")
+		csi.RestoreCursorPosition()
 		time.Sleep(500 * time.Millisecond)
 	}
 }
-
-var clearNext = true
-
-func clearScreen() {
-	if !clearNext {
-		clearNext = true
-		return
-	}
-
-	if runtime.GOOS == "windows" {
-		cmd := exec.Command("cmd", "/c", "cls")
-		cmd.Stdout = os.Stdout
-		cmd.Run()
-	} else {
-		fmt.Println("\033[2J")
-	}
-}
-
-func moveCursorUp(times int) {
-	fmt.Printf("\033[%vA", times)
-	fmt.Print("\033[E")
-}
-
-func moveCursorDown(times int) {
-	fmt.Printf("\033[%vB", times)
-}
-
-func moveCursorRight(times int) {
-	fmt.Printf("\033[%vC", times)
-}
-- 
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