yui-examples/crush.lua

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2022-08-24 15:31:24 +02:00
--- crush - The uncomplicated dependency system for LÖVE.
--
-- Author: Lorenzo Cogotti
-- Copyright: 2022 The DoubleFourteen Code Forge
-- License: MIT (see LICENSE file for details)
local io = require 'io'
local os = require 'os'
-- System specific functions
--
-- Portions of this code are based on work from the LuaRocks project.
-- LuaRocks is free software and uses the MIT license.
--
-- LuaRocks website: https://luarocks.org
-- LuaRocks sources: https://github.com/luarocks/luarocks
local is_windows = package.config:sub(1,1) == "\\"
local is_directory
local Q
local quiet
local chdir
local mkdir
if is_windows then
-- ---------------
-- NOTE: untested!
-- ---------------
-- local
function is_directory(path)
local fh, _, code = io.open(path, 'r')
if code == 13 then -- directories return "Permission denied"
fh, _, code = io.open(path.."\\", 'r')
if code == 2 then -- directories return 2, files return 22
return true
end
end
if fh then
fh:close()
end
return false
end
local function split_path(s)
local drive = ""
local root = ""
local rest
local unquoted = s:match("^['\"](.*)['\"]$")
if unquoted then
s = unquoted
end
if s:match("^.:") then
drive = s:sub(1, 2)
s = s:sub(3)
end
if s:match("^[\\/]") then
root = s:sub(1, 1)
rest = s:sub(2)
else
rest = s
end
return drive, root, rest
end
-- local
function Q(s)
local drive, root, rest = split_path(s)
if root ~= "" then
s = s:gsub("/", "\\")
end
if s == "\\" then
return '\\' -- CHDIR needs special handling for root dir
end
-- URLs and anything else
s = s:gsub('\\(\\*)"', '\\%1%1"')
s = s:gsub('\\+$', '%0%0')
s = s:gsub('"', '\\"')
s = s:gsub('(\\*)%%', '%1%1"%%"')
return '"'..s..'"'
end
-- local
function quiet(cmd)
return cmd.." 2> NUL 1> NUL"
end
-- local
function chdir(newdir, cmd)
local drive = newdir:match("^([A-Za-z]:)")
cmd = "cd "..Q(newdir).." & "..cmd
if drive then
cmd = drive.." & "..cmd
end
return cmd
end
-- local
function mkdir(path)
local cmd = "mkdir "..Q(path).." 2> NUL 1> NUL"
os.execute(cmd)
if not is_directory(path) then
error("Couldn't create directory '"..path.."'.")
end
end
else
-- local
function is_directory(path)
local fh, _, code = io.open(path.."/.", 'r')
if code == 2 then -- "No such file or directory"
return false
end
if code == 20 then -- "Not a directory", regardless of permissions
return false
end
if code == 13 then -- "Permission denied", but is a directory
return true
end
if fh then
_, _, code = fh:read(1)
fh:close()
if code == 21 then -- "Is a directory"
return true
end
end
return false
end
-- local
function Q(s)
return "'"..s:gsub("'", "'\\''").."'"
end
-- local
function quiet(cmd)
return cmd.." >/dev/null 2>&1"
end
-- local
function chdir(newdir, cmd)
return "cd "..Q(newdir).." && "..cmd
end
-- local
function mkdir(path)
local cmd = "mkdir "..Q(path).." >/dev/null 2>&1"
os.execute(cmd)
if not is_directory(path) then
error("Couldn't create directory '"..path.."'.")
end
end
end
-- Dependency fetch
local function fetch(dep)
local dest = 'lib/'..dep.name
print(("Dependency %s -> %s (%s)"):format(dep.name, dest, dep.url))
local cmd, fullcmd
if is_directory(dest) then
-- Directory exists, pull operation
cmd = "git pull"
fullcmd = chdir(dest, quiet("git pull"))
else
-- Directory doesn't exist, clone operation
cmd = "git clone "..Q(dep.url).." "..Q(dep.name)
fullcmd = chdir("lib", quiet(cmd))
end
if not os.execute(fullcmd) then
error(dep.name..": Dependency fetch failed ("..cmd..").")
end
end
-- .lovedeps file scan
local function map_file(name)
local fh = io.open(name, 'r')
if fh == nil then
error(name..": can't read file.")
end
local contents = fh:read('*all')
fh:close()
return contents
end
local function scandeps(manifest, mode, deps)
mode = mode or 'nodups'
deps = deps or {}
local contents = map_file(manifest)
contents = "return "..contents
local fun, res = load(contents, manifest, 't', {})
if not fun then
error(res)
end
local ok, def = pcall(fun)
if not ok then
error(def) -- def is now pcall()'s error message
end
if type(def) ~= 'table' then
error("[string \""..manifest.."\"]: Loading resulted in a '"..type(def).."', while 'table' was expected.")
end
for name,url in pairs(def) do
if type(url) == 'function' then
goto skip -- ignore functions
end
if type(url) ~= 'string' then
error("[string \""..manifest.."\"]: "..name..": git repository URL must be a 'string'.")
end
for i in ipairs(deps) do
if name == deps[i].name then
if mode == 'skipdups' then
goto skip
end
error("[string \""..manifest.."\"]: "..name..": Duplicate dependency.")
end
end
deps[#deps+1] = { name = name, url = url }
::skip::
end
return deps
end
-- Entry point
local function file_exists(name)
local fh = io.open(name, 'r')
if fh ~= nil then
fh:close()
return true
end
return false
end
local function run()
local deps = scandeps(".lovedeps")
mkdir("lib")
-- NOTE: deps array may grow while scanning
local i = 1
while i <= #deps do
local dep = deps[i]
-- Fetch dependency
fetch(dep)
-- Resolve dependency's dependencies
local depmanifest = "lib/"..dep.name.."/.lovedeps"
if file_exists(depmanifest) then
scandeps(depmanifest, 'skipdups', deps)
end
i = i + 1
end
end
run()