Support using multiple lua init scripts per save.

This should make it easier to add and remove init script code by
automated means, or install multiple mods that need such code.

Lua API.html

@@ -3270,8 +3270,9 @@ The <tt class="docutils literal">name</tt> argument should be the name stem, as
 <div class="section" id="save-init-script">
 <h2><a class="toc-backref" href="#id62">Save init script</a></h2>
 <p>If a save directory contains a file called <tt class="docutils literal">raw/init.lua</tt>, it is
-automatically loaded and executed every time the save is loaded. It
-can also define the following functions to be called by dfhack:</p>
+automatically loaded and executed every time the save is loaded.
+The same applies to any files called <tt class="docutils literal"><span class="pre">raw/init.d/*.lua</span></tt>. Every
+such script can define the following functions to be called by dfhack:</p>
 <ul>
 <li><p class="first"><tt class="docutils literal">function onStateChange(op) ... end</tt></p>
 <p>Automatically called from the regular onStateChange event as long
@@ -3281,7 +3282,8 @@ cleanup concerns.</p>
 </li>
 <li><p class="first"><tt class="docutils literal">function onUnload() ... end</tt></p>
 <p>Called when the save containing the script is unloaded. This function
-should clean up any global hooks installed by the script.</p>
+should clean up any global hooks installed by the script. Note that
+when this is called, the world is already completely unloaded.</p>
 </li>
 </ul>
 <p>Within the init script, the path to the save directory is available as <tt class="docutils literal">SAVE_PATH</tt>.</p>

Lua API.rst

@@ -3199,8 +3199,9 @@ Save init script
 ================
 
 If a save directory contains a file called ``raw/init.lua``, it is
-automatically loaded and executed every time the save is loaded. It
-can also define the following functions to be called by dfhack:
+automatically loaded and executed every time the save is loaded.
+The same applies to any files called ``raw/init.d/*.lua``. Every
+such script can define the following functions to be called by dfhack:
 
 * ``function onStateChange(op) ... end``
 
@@ -3212,6 +3213,7 @@ can also define the following functions to be called by dfhack:
 * ``function onUnload() ... end``
 
   Called when the save containing the script is unloaded. This function
-  should clean up any global hooks installed by the script.
+  should clean up any global hooks installed by the script. Note that
+  when this is called, the world is already completely unloaded.
 
 Within the init script, the path to the save directory is available as ``SAVE_PATH``.

NEWS

@@ -3,8 +3,11 @@ DFHack future
   Internals:
     - support for calling a lua function via a protobuf request (demonstrated by dfhack-run --lua).
     - Lua API for listing files in directory. Needed for mod-manager.
+    - support for multiple raw/init.d/*.lua init scripts in one save.
+
   New scripts:
     - gui/mod-manager: allows installing/uninstalling mods into df from df/mods directory.
+    - gui/clone-uniform: duplicates the currently selected uniform in the military screen.
 
   New commands:
     - move the 'grow', 'extirpate' and 'immolate' commands as 'plant' subcommands

library/lua/dfhack.lua

@@ -366,11 +366,28 @@ function dfhack.getSavePath()
 end
 
 if dfhack.is_core_context then
+    local function loadInitFile(path, name)
+        local env = setmetatable({ SAVE_PATH = path }, { __index = base_env })
+        local f,perr = loadfile(name, 't', env)
+        if f == nil then
+            if not string.match(perr, 'No such file or directory') then
+                dfhack.printerr(perr)
+            end
+        elseif safecall(f) then
+            if not internal.save_init then
+                internal.save_init = {}
+            end
+            table.insert(internal.save_init, env)
+        end
+    end
+
     dfhack.onStateChange.DFHACK_PER_SAVE = function(op)
         if op == SC_WORLD_LOADED or op == SC_WORLD_UNLOADED then
             if internal.save_init then
-                if internal.save_init.onUnload then
-                    safecall(internal.save_init.onUnload)
+                for k,v in ipairs(internal.save_init) do
+                    if v.onUnload then
+                        safecall(v.onUnload)
+                    end
                 end
                 internal.save_init = nil
             end
@@ -378,18 +395,24 @@ if dfhack.is_core_context then
             local path = dfhack.getSavePath()
 
             if path and op == SC_WORLD_LOADED then
-                local env = setmetatable({ SAVE_PATH = path }, { __index = base_env })
-                local f,perr = loadfile(path..'/raw/init.lua', 't', env)
-                if f == nil then
-                    if not string.match(perr, 'No such file or directory') then
-                        dfhack.printerr(perr)
+                loadInitFile(path, path..'/raw/init.lua')
+
+                local dirlist = dfhack.internal.getDir(path..'/raw/init.d/')
+                if dirlist then
+                    table.sort(dirlist)
+                    for i,name in ipairs(dirlist) do
+                        if string.match(name,'%.lua$') then
+                            loadInitFile(path, path..'/raw/init.d/'..name)
                         end
-                elseif safecall(f) then
-                    internal.save_init = env
                     end
                 end
-        elseif internal.save_init and internal.save_init.onStateChange then
-            safecall(internal.save_init.onStateChange, op)
+            end
+        elseif internal.save_init then
+            for k,v in ipairs(internal.save_init) do
+                if v.onStateChange then
+                    safecall(v.onStateChange, op)
+                end
+            end
         end
     end
 end