Java-OC Installer

local fs = require("filesystem")
local term = require("term")

if fs.get("bin/edit.lua") == nil or fs.get("bin/edit.lua").isReadOnly() then
    error("Floppy disk filesystem detected: type \"install\" in command line and install OpenOS to your Hard Drive. After that run Java installer again.");
else
    term.write("\nSearching for older versions...");
    if fs.exists("/bin/java.lua") then
        term.write("\nRemoving java.lua...");
        fs.remove("/bin/java.lua");
        term.write("\nSuccess!");
    elseif fs.exists("/bin/javaw.lua") then
        term.write("\nRemoving javaw.lua...");
        fs.remove("/bin/javaw.lua");
        term.write("\nSuccess!");
    elseif fs.exists("/usr/man/java") then
        term.write("\nRemoving manual for java...");
        fs.remove("/usr/man/javaw.lua");
        term.write("\nSuccess!");
    elseif fs.exists("/usr/man/javaw") then
        term.write("\nRemoving manual for javaw...");
        fs.remove("/usr/man/javaw.lua");
        term.write("\nSuccess!");
    else
        term.write("\nNo older versions were found. Resuming download...");
    end
    term.write("\n\nDownloading java executables...\n[");

    local endJExecFile = "/bin/java.lua";
    local endVMExecFile = "/bin/javaw.lua";
    local endJManFile = "/usr/man/java";
    local endVMManFile = "/usr/man/javaw";

    local success1 = false;
    local success2 = false;

    loadfile("/bin/wget.lua")("https://raw.githubusercontent.com/Vladg24YT/OC-JDK/master/core/bin/java.lua", endJExecFile, "-fQ");
    loadfile("/bin/wget.lua")("https://raw.githubusercontent.com/Vladg24YT/OC-JDK/master/core/bin/javaw.lua", endVMExecFile, "-fQ");
    for i = 1, 10 do
        if i==10 then
            if fs.exists("/bin/java.lua") and fs.exists("/bin/javaw.lua") then
                term.write("]\nDownload Complete\n");
                success1 = true;
                os.sleep(2);
            elseif not fs.exists("/bin/java.lua") then
                io.stderr:write("\nAn error occured: Failed to download java.lua");
            elseif not fs.exists("/bin/javaw.lua") then
                io.stderr:write("\nAn error occured: Failed to download javaw.lua");
            else
                io.stderr:write("\nAn Error occured: Failed to download all files. Try to check your Internet connection and launch the installer again");
            end
        else
            term.write("#");
            os.sleep(1);
        end
    end

    term.write("\nDownloading manuals...\n[");
    loadfile("/bin/wget.lua")("https://raw.githubusercontent.com/Vladg24YT/OC-JDK/master/core/bin/java", endJManFile, "-fQ");
    loadfile("/bin/wget.lua")("https://raw.githubusercontent.com/Vladg24YT/OC-JDK/master/core/bin/javaw", endVMManFile, "-fQ");
    for i = 1, 10 do
        if i==10 then
            if fs.exists("/usr/man/java") and fs.exists("/usr/man/javaw") then
                term.write("]\nDownload Complete\n");
                success2 = true;
                os.sleep(2);
            elseif not fs.exists("/usr/man/java") then
                io.stderr:write("\nAn error occured: Failed to download manual for \'java\'");
            elseif not fs.exists("/usr/man/javaw") then
                io.stderr:write("\nAn error occured: Failed to download manual for \'javaw\'");
            else
                io.stderr:write("\nAn Error occured: Failed to download all manuals. Try to check your Internet connection and launch the installer again");
            end
        else
            term.write("#");
            os.sleep(1);
        end
    end

    if success1 and success2 then
        term.write("All core files installed;\n\nTo get VM help type \'javaw -h';\nTo get java help type \'java -h\'\nTo download or update JDK and Java, type java -u");
    else
        term.write("Woops! Something happened and java-core wasn\'t installed. Exiting...");
    end
end