[crush] Update crush.lua.

.lovedeps

@@ -1,3 +1,3 @@
 {
-    serialize = 'https://git.doublefourteen.io/lua/df-serialize'
+    serialize = 'https://gitea.it/1414codeforge/df-serialize'
 }

README.md

@@ -13,11 +13,11 @@ It makes your game easy to translate to multiple languages.
 
 ## Dependencies
 
-**moonspeak** uses [df-serialize](https://git.doublefourteen.io/lua/df-serialize)
+**moonspeak** uses [df-serialize](https://gitea.it/1414codeforge/df-serialize)
 to read the dictionary file.
 
 You may either doenload **df-serialize** manually and place it inside a `lib` subdirectory,
-or use [crush](https://git.doublefourteen.io/lua/crush)
+or use [crush](https://gitea.it/1414codeforge/crush)
 to do this for you.
 
 ## Using crush to download moonspeak dependencies
@@ -25,7 +25,7 @@ to do this for you.
 1. Clone this repository.
 
 ```sh
-git clone https://git.doublefourteen.io/lua/moonspeak
+git clone https://gitea.it/1414codeforge/moonspeak
 ```
 
 2. Move to repository root directory:
@@ -44,14 +44,14 @@ You should now see a `lib` subdirectory containing the necessary dependencies.
 
 ## Integrating moonspeak in my project using crush
 
-1. Download the latest [crush.lua](https://git.doublefourteen.io/lua/crush/src/branch/master/crush.lua) file and
+1. Download the latest [crush.lua](https://gitea.it/1414codeforge/crush/src/branch/master/crush.lua) file and
    place it in your project's root directory.
 
 2. Create a `.lovedeps` text file in your project's root with the following dependency entry:
 
 ```lua
 {
-    moonspeak = "https://git.doublefourteen.io/lua/moonspeak",
+    moonspeak = "https://gitea.it/1414codeforge/moonspeak",
 
     -- ...more dependencies, if necessary...
 }

crush.lua

@@ -2,11 +2,39 @@
 --
 -- Author: Lorenzo Cogotti
 -- Copyright: 2022 The DoubleFourteen Code Forge
--- License: MIT (see LICENSE file for details)
+-- Home: https://gitea.it/1414codeforge/crush
+-- License: MIT
 
 local io = require 'io'
 local os = require 'os'
 
+-- Lua version check
+
+local function check_version()
+    -- Generic Lua version check - 5.2 required
+    if _VERSION then
+        local maj, min = _VERSION:match("Lua (%d+)%.(%d+)")
+
+        if maj and min then
+            maj, min = tonumber(maj), tonumber(min)
+            if maj > 5 or (maj == 5 and min >= 2) then
+                return true
+            end
+        end
+    end
+
+    -- LuaJIT check - 2.0.0 required (technically 2.0.0_beta11)
+    if jit and jit.version_num and jit.version_num >= 20000 then
+        return true
+    end
+
+    return false
+end
+
+if not check_version() then
+    error("Unsupported Lua version!\nSorry, crush requires Lua 5.2 or LuaJIT 2.0.0.")
+end
+
 -- System specific functions
 --
 -- Portions of this code are based on work from the LuaRocks project.
@@ -24,10 +52,6 @@ local chdir
 local mkdir
 
 if is_windows then
-    -- ---------------
-    -- NOTE: untested!
-    -- ---------------
-
     -- local
     function is_directory(path)
         local fh, _, code = io.open(path, 'r')
@@ -178,7 +202,11 @@ local function fetch(dep)
         fullcmd = chdir("lib", quiet(cmd))
     end
 
-    if not os.execute(fullcmd) then
+    -- On success, os.execute() returns:
+    -- true on regular Lua
+    -- 0 on LuaJIT (actual OS error code)
+    local code = os.execute(fullcmd)
+    if code ~= true and code ~= 0 then
         error(dep.name..": Dependency fetch failed ("..cmd..").")
     end
 end