ccpt/ccptinstall.lua

--[[ 
    ComputerCraft Package Tool Installer
    Author: PentagonLP, Hion-V
    Version: 1.1
    Lines of Code: 161; Characters: 5541
]]
 
-- Read arguments
args = {...}
 
-- FILE MANIPULATION FUNCTIONS --
--[[ Checks if file exists
    @param String filepath: Filepath to check
    @return boolean: Does the file exist?
--]]
function file_exists(filepath)
    local f=io.open(filepath,"r")
    if f~=nil then 
        io.close(f) 
        return true 
    else 
        return false 
    end
end
 
--[[ Stores a file in a desired location
    @param String filepath: Filepath where to create file (if file already exists, it gets overwritten)
    @param String content: Content to store in file
--]]
function storeFile(filepath,content)
    writefile = fs.open(filepath,"w")
    writefile.write(content)
    writefile.close()
end
 
--[[ Reads a file from a desired location
    @param String filepath: Filepath to the file to read
    @param String createnew: (Optional) Content to store in new file and return if file does not exist. Can be nil.
    @return String|boolean content|error: Content of the file; If createnew is nil and file doesn't exist boolean false is returned
--]]
function readFile(filepath,createnew)
    readfile = fs.open(filepath,"r")
    if readfile == nil then
        if not (createnew==nil) then
            storeFile(filepath,createnew)
            return createnew
        else
            return false
        end
    end
    content = readfile.readAll()
    readfile.close()
    return content
end
 
--[[ Stores a table in a file
    @param String filepath: Filepath where to create file (if file already exists, it gets overwritten)
    @param Table data: Table to store in file
--]]
function storeData(filepath,data)
    storeFile(filepath,textutils.serialize(data):gsub("\n",""))
end
 
--[[ Reads a table from a file in a desired location
    @param String filepath: Filepath to the file to read
    @param boolean createnew: If true, an empty table is stored in new file and returned if file does not exist.
    @return Table|boolean content|error: Table thats stored in the file; If createnew is false and file doesn't exist boolean false is returned
--]]
function readData(filepath,createnew)
    if createnew then
        return textutils.unserialize(readFile(filepath,textutils.serialize({}):gsub("\n","")))
    else
        return textutils.unserialize(readFile(filepath,nil))
    end
end
 
-- HTTP FETCH FUNCTIONS --
--[[ Gets result of HTTP URL
    @param String url: The desired URL
    @return Table|boolean result|error: The result of the request; If the URL is not reachable, an error is printed in the terminal and boolean false is returned
--]]
function gethttpresult(url)
    if not http.checkURL(url) then
        print("ERROR: Url '" .. url .. "' is blocked in config. Unable to fetch data.")
        return false
    end
    result = http.get(url)
    if result == nil then
        print("ERROR: Unable to reach '" .. url .. "'")
        return false
    end
    return result
end
 
--[[ Download file HTTP URL
    @param String filepath: Filepath where to create file (if file already exists, it gets overwritten)
    @param String url: The desired URL
    @return nil|boolean nil|error: nil; If the URL is not reachable, an error is printed in the terminal and boolean false is returned
--]]
function downloadfile(filepath,url)
    result = gethttpresult(url)
    if result == false then 
        return false
    end
    storeFile(filepath,result.readAll())
end
 
-- MISC HELPER FUNCTIONS --
--[[ Checks wether a String starts with another one
    @param String haystack: String to check wether is starts with another one
    @param String needle: String to check wether another one starts with it
    @return boolean result: Wether the firest String starts with the second one
]]--
function startsWith(haystack,needle)
    return string.sub(haystack,1,string.len(needle))==needle
end
 
-- MAIN PROGRAMM --
if (args[1]=="install") or (args[1]==nil) then
    print("[Installer] Well, hello there!")
    print("[Installer] Thank you for downloading the ComputerCraft Package Tool! Installing...")
    print("[Installer] Installing 'properprint' library...")
    if downloadfile("lib/properprint","https://raw.githubusercontent.com/Hion-V/properprint/main/properprint")== false then
        return false
    end
    print("[Installer] Successfully installed 'properprint'!")
    print("[Installer] Installing 'ccpt'...")
    if downloadfile("ccpt","https://git.subsonics.nl/pootercraft/ccpt/raw/branch/main/ccpt")==false then
        return false
    end
    print("[Installer] Successfully installed 'ccpt'!")
    print("[Installer] Running 'ccpt update'...")
    shell.run("ccpt","update")
    print("[Installer] Reading package data...")
    packagedata = readData("/.ccpt/packagedata")
    print("[Installer] Storing installed packages...")
    storeData("/.ccpt/installedpackages",{
        ccpt = packagedata["ccpt"]["newestversion"],
        pprint = packagedata["pprint"]["newestversion"]
    })
    print("[Installer] 'ccpt' successfully installed!")
elseif args[1]=="update" then
    print("[Installer] Updating 'ccpt'...")
    if downloadfile("ccpt","https://git.subsonics.nl/pootercraft/ccpt/raw/branch/main/ccpt")==false then
        return false
    end
elseif args[1]=="remove" then
    print("[Installer] Uninstalling 'ccpt'...")
    fs.delete("/ccpt")
    fs.delete("/.ccpt")
    shell.setCompletionFunction("ccpt", nil)
    if file_exists("startup") and startsWith(startup,"-- ccpt: Seach for updates\nshell.run(\"ccpt\",\"startup\")") then
        print("[Installer] Removing 'ccpt' from startup...")
        startup = readFile("startup","")
        storeFile("startup",string.sub(startup,56))
    end
    print("[Installer] So long, and thanks for all the fish!")
else
    print("[Installer] Invalid argument: " .. args[1])
end