Initial commit.

Makefile

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+all:
+	zip -f ./aseprite-advanced-spritesheets *.lua LICENSE

advanced-spritesheet-export.lua

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+local extKey = "annabunches/AtlasExporter"
+
+function init(plugin)
+  plugin:newCommand{
+    id="AnnabunchesASEExportSpritesheetAdvanced",
+    title="Export Spritesheet (Advanced)",
+    group="file_export",
+    onclick=exportSpritesheetAdvanced
+  }
+
+  plugin:newCommand{
+    id="AnnabunchesASEToggleIgnoreLayer",
+    title="Ignore on Export",
+    group="layer_popup_menu",
+    onclick=toggleIgnore
+  }
+
+  plugin:newCommand{
+    id="AnnabunchesASEToggleExportAsSprite",
+    title="Export as Sprite",
+    group="layer_popup_menu",
+    onclick=toggleExportAsSprite
+  }
+end
+
+local function revealLayers(layers)
+  for i, layer in ipairs(layers) do
+    if layer.isGroup then
+      revealLayers(layer.layers)
+    end
+
+    if not layer.isVisible then
+      layer.isVisible = true
+      layer.properties(extKey).revealed = true
+    end
+  end
+end
+
+local function restoreLayers(layers)
+  for i, layer in ipairs(layers) do
+    if layer.isGroup then
+      restoreLayers(layer.layers)
+    end
+
+    if layer.properties(extKey).revealed then
+      layer.isVisible = false
+--      layer.properties(extKey).revealed = nil
+    end
+  end
+end
+
+local function deleteLayers(sprite, layers)
+  for i, layer in ipairs(layers) do
+    if layer.name:find("%+i") then
+      sprite:deleteLayer(layer)
+    elseif layer.isGroup then
+      deleteLayers(sprite, layer.layers)
+    end
+  end
+end
+
+local function flattenLayers(layers)
+  for i, layer in ipairs(layers) do
+    if not layer.isGroup then
+      goto continue
+    end
+
+    -- Layers "tagged" with +f get flattened
+    if layer.name:find("%+f") then
+      app.range.layers = { layer }
+      app.command.FlattenLayers(false)
+    else
+      -- recurse
+      flattenLayers(layer.layers)
+    end
+
+    ::continue::
+  end
+end
+
+local function exportSpritesheetAdvanced()
+  local sprite = app.activeSprite
+  if not sprite then
+    return app.alert "Must have a sprite open to export."
+  end
+
+  app.transaction(function()
+    deleteLayers(sprite, sprite.layers)
+    flattenLayers(sprite.layers)
+    revealLayers(sprite.layers)
+  end)
+  app.command.ExportSpriteSheet {
+    splitLayers=true,
+  }
+  restoreLayers(sprite.layers)
+  app.undo()
+end
+
+main()

package.json

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+{
+    "name": "advanced-spritesheets",
+    "displayName": "Advanced Spritesheets"
+    "description": "Improved spritesheet export functionality for Aseprite.",
+    "version": "0.1",
+    "author": { "name": "Anna Wiggins",
+                "email": "annabunches@gmail.com",
+                "url": "https://annabunches.net" },
+    "contributors": [ ],
+    "publisher": "annabunches",
+    "license": "CC BY-SA 4.0",
+    "categories": [ "Scripts" ],
+    "contributes": {
+        "scripts": [
+            { "path": "./advanced-spritesheet-export.lua" }
+        ]
+    }
+}

readme.md

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+# Advanced spritesheet functionality for Aseprite
+
+This extension adds a more sophisticated spritesheet export command to Aseprite.
+
+## Installation
+
+To install, go to Aseprite's Settings -> Extensions -> Add Extension, and select advanced-spritesheet-export.aseprite-extension
+
+## Features
+
+* Choose which layers to export, regardless of visibility.
+* Export groups as a single sprite.
+
+## Usage
+
+* All layers are exported by default. To ignore a layer, tk.
+* To export a group as a single sprite, tk
+* Invoke the tool via File -> Export -> Export Sprite Sheet (Advanced).
+* Use the Sprite Sheet Export dialog as normal, but make sure Layers is set to "Visible Layers."