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if os.ccboot then
term.setTextColor(colors.red);
print("Please reboot if you want to use this bootloader.");
error();
end;
-- Add ccboot identifier to OS variable
os.ccboot = true;
os.ccboot_version = "1.0";
-- Define constants
local VERSION = "1.0";
local AUTHOR_INFO = "Written by Adrian Ulbrich"
local INFO_TEXT = { "Use the up and down arrow keys to select", "which entry is highlighted.", "Press enter to boot the selected OS." };
local TIMEOUT_TEXT = { "The highlighted entry will be executed", "automatically in {TIMEOUT} seconds." };
local CONFIG_PATH = "boot/ccboot/ccboot.cfg";
local DEFAULT_SELECTED = 1;
local DEFAULT_TIMEOUT = -1;
-- Define local variables
local selected = nil;
local timeout = nil;
local entryNames = {};
local entryPaths = {};
local configFile;
local timeoutTimer = nil;
-- Always pull raw events
local pullEvent = os.pullEvent;
os.pullEvent = os.pullEventRaw;
-- Get terminal dimensions
local w, h = term.getSize();
-- Define functions
function string.startsWith(str, text)
return string.sub(str, 1, string.len(text)) == text;
end;
function fatalError(text)
term.setTextColor(colors.red);
print(text);
term.setTextColor(colors.white);
print("press any key to reboot.");
os.pullEvent("key");
os.reboot();
end;
function printTimeoutText()
for i, v in pairs(TIMEOUT_TEXT) do
term.setCursorPos(6, h - 3 + i);
write(string.gsub(v, "{TIMEOUT}", timeout));
end;
end;
function removeTimeoutText()
term.setTextColor(colors.black);
printTimeoutText();
term.setTextColor(colors.white);
end
function bootOS(index)
local n = 1;
for i, v in pairs(entryPaths) do
if n == index then
term.clear();
term.setCursorPos(1, 1);
os.pullEvent = pullEvent;
shell.run(v);
os.shutdown();
end
n = n + 1;
end;
end;
-- Clear the screen
term.clear();
term.setCursorPos(1, 1);
-- Check if the config file exists
if not fs.exists(CONFIG_PATH) then
fatalError("fatal error: ccboot config file could not be found (\"" .. CONFIG_PATH .. "\").");
end;
-- Read the config file
configFile = io.open(CONFIG_PATH, "r");
if configFile == nil then
fatalError("fatal error: ccboot config file could not be opened for reading (\"" .. CONFIG_PATH .. "\").");
end;
for line in configFile:lines() do
if string.startsWith(line, "selected ") then
selected = tonumber(string.sub(line, #"selected " + 1));
elseif string.startsWith(line, "timeout ") then
timeout = tonumber(string.sub(line, #"timeout " + 1));
elseif string.startsWith(line, "entry ") then
local entry = string.sub(line, #"entry " + 1);
local splitPos = string.find(entry, ";");
local name = string.sub(entry, 1, splitPos - 1);
local path = string.sub(entry, splitPos + 1);
table.insert(entryNames, name);
table.insert(entryPaths, path);
end;
end;
if selected == nil then selected = DEFAULT_SELECTED end;
if timeout == nil then timeout = DEFAULT_TIMEOUT end;
io.close(configFile);
local nameString = "CCboot version " .. VERSION;
-- Print the name at the top
term.setCursorPos((w - #nameString) / 2, 2);
write(nameString);
term.setCursorPos((w - #AUTHOR_INFO) / 2, 3);
write(AUTHOR_INFO);
for i, v in pairs(INFO_TEXT) do
term.setCursorPos(6, h - 6 + i);
write(v);
end;
if timeout > -1 then
timeoutTimer = os.startTimer(1);
printTimeoutText();
end;
-- Print the entries and handle keyboard input
while true do
local printIndex = 1;
for i, v in pairs(entryNames) do
if printIndex == selected then
term.setTextColor(colors.black);
term.setBackgroundColor(colors.white);
end;
term.setCursorPos(3, 5 + printIndex - 1);
for i=0,w - 6 do write(' ') end
term.setCursorPos(3, 5 + printIndex - 1);
print(v);
if printIndex == selected then
term.setTextColor(colors.white);
term.setBackgroundColor(colors.black);
end;
printIndex = printIndex + 1;
end
local event, val = os.pullEvent();
if event == "key" then
if val == keys.up then
selected = selected - 1;
os.cancelTimer(timeoutTimer);
removeTimeoutText();
elseif val == keys.down then
selected = selected + 1;
os.cancelTimer(timeoutTimer);
removeTimeoutText();
elseif val == keys.enter then
bootOS(selected);
end;
if selected < 1 then
selected = 1;
elseif selected >= printIndex then
selected = selected - 1;
end;
elseif event == "timer" and val == timeoutTimer then
timeout = timeout - 1;
printTimeoutText();
if timeout == -1 then
bootOS(selected);
end;
timeoutTimer = os.startTimer(1);
end;
end;
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