AST.lua (AioSecureTerminal)

--Creddits to Aio 2022
--Created on july the 4:th 2022 this is a somewhat safer terminal program called
--AST (AioSecureTerminal)
--NOTE: It IS escapable and is only intended to reduce the risk of operator error

print("Starting")
function reset()
term.setCursorPos(1,1)
term.clear()
history={}
shell.run("mkdir ./trash")
shell.run("mkdir ./home")
LLCPath = {}
CPath = "."
CPI = CPath
for s=1,20 do
    shell.run("cd ..")
end
LastCommand = ""
term.clear()
term.setCursorPos(1,1)
term.setTextColor(colors.white)
end

function command(s)
    if s == "" or s == "last" then
        command(LastCommand)
    else
        LastCommand = s
    end
    print("")

    if s == "ls" then
        shell.run("dir")
        return "safe exit"
    end

    if s == "reset" or s == "clear" then
        reset()
    end
    if s == "help" then
        term.setTextColor(colors.white)
        print("exit - esacpe the terminal")
        print("cd - change directory")
        print("'cd' or 'cd ~' will change to ./home")
        print("Due to bad coding, recursive CD:s breaks the pwd and CPI functions")
        print("pwd - attempts to show the current directory")
        print("rm - will move files/folders to ./trash")
        print("reset / clear - clears the screen and moves to ./")
        print("'' / last - activates the last command")
        print("")
        print("1/2 press enter to continue")
        read()
    end
    if string.sub(s,1,2) == "cd" then
        CPI = CPath
        if s == "cd ~" or s == "cd" then
            shell.run("cd ./")
            shell.run("cd home")
            LLCPath = {"./~"}
            CPath = "./home"
        elseif s == "cd .." then
            CPI = CPath
            if CPath == "." then
            printError("Already on ./")
            else
            shell.run("cd ..")
            t = CPath
            CPath = LLCPath[#LLCPath]
            LLCPath[#LLCPath] = nil
            end
        elseif string.sub(s,1,3) == "cd " then
            CPI = "?"
            u = 1
            LLCPath = {}
            for i=1,string.len(s.."/"..CPath) do
                if string.sub(CPath.."/"..s,i,i) == "/" then
                    LLCPath[#LLCPath+1] = string.sub(CPath.."/"..s,u,(i-1))
                    u = i
                end
            end
            shell.run(s)
            --LLCPath[#LLCPath+1] = CPath
            CPath = CPath.."/"..string.sub(s,3,string.len(s))
        else
            shell.run(s)
        end
    elseif s == "pwd" then
        print(CPath)
    elseif string.sub(s,1,3) == "rm " then
        if fs.exists(string.sub(s,4,string.len(s))) then
            if fs.isDir(string.sub(s,4,string.len(s))) then
                term.setTextColor(colors.yellow)
                print("You are about to remove a directory!")
                print("Are you sure? [Y/n]")
                if string.upper(read()) == "Y" then
                    shell.run("mv",string.sub(s,3,string.len(s)),"./trash")
                end
            else
                shell.run("mv", string.sub(s,3,string.len(s)),"./trash")
            end
        else
            printError("File or directory not found")
        end
        return "safe exit"
    elseif s == "ls" then
        shell.run("dir")
    elseif string.sub(s,1,3) == "bg " or string.sub(s,1,3) == "fg " or s == "fg" or s == "bg" then
        printError("Multitasking is not allowed for safety reasons")
    else
        shell.run(s)
    end
end


reset()
print("Welcome!")
History = {}
bo = 0
while true do
    if bo == 5 then
        term.setTextColor(colors.brown)
        command("pwd")
        print("")
        sleep(0)
        bo = 0
    else
        bo = bo + 1
    end
    OX,OY = term.getCursorPos()
    term.setCursorPos(1,OY-1)
    term.setTextColor(colors.white)
    term.clearLine()
    print(" >   ")
    term.setCursorPos(string.len(" >  "),OY-1)
    term.setTextColor(colors.gray)
    print(os.date())
    term.setTextColor(colors.blue)
    term.setCursorPos(string.len(" >",os.date())+1,OY-1)
    o = read()
    History[#History+1] = o
    if o == "save" then
        print("Location from ./?")
        o = read()
        if fs.exists(o) then
            printError("Location exists aborting")
        else
            h = fs.open(o,"w")
            for i=1,#History do
                h.writeLine(History[i])
            end
            h.close()
        end
    elseif o == "exit" then
        break
    end
    command(o)
end