Data previews: add utils to generate/clear previews.

Not much to add, you can now clear previews from current .blend file, or a set of non-opened files.
Likewise, you can generate previews (for mat/tex, objects, groups, scenes, ...).

3 files changed, 250 insertions, 0 deletions

diff --git a/release/scripts/startup/bl_operators/__init__.py b/release/scripts/startup/bl_operators/__init__.py
index 4047505652f..35c7a55b6da 100644
--- a/release/scripts/startup/bl_operators/__init__.py
+++ b/release/scripts/startup/bl_operators/__init__.py
@@ -28,6 +28,7 @@ _modules = [
     "anim",
     "clip",
     "console",
+    "file",
     "image",
     "mask",
     "mesh",
diff --git a/release/scripts/startup/bl_operators/file.py b/release/scripts/startup/bl_operators/file.py
new file mode 100644
index 00000000000..a6a6982e746
--- /dev/null
+++ b/release/scripts/startup/bl_operators/file.py
@@ -0,0 +1,243 @@
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+# <pep8 compliant>
+
+import bpy
+from bpy.types import Operator
+from bpy.props import (
+        StringProperty,
+        BoolProperty,
+        CollectionProperty,
+        )
+
+# ########## Datablock previews... ##########
+
+class WM_OT_previews_batch_generate(Operator):
+    """Generate selected .blend file's previews"""
+    bl_idname = "wm.previews_batch_generate"
+    bl_label = "Batch-Generate Previews"
+    bl_options = {'REGISTER'}
+
+    # -----------
+    # File props.
+    files = CollectionProperty(
+            type=bpy.types.OperatorFileListElement,
+            options={'HIDDEN', 'SKIP_SAVE'},
+            )
+
+    directory = StringProperty(
+            maxlen=1024,
+            subtype='FILE_PATH',
+            options={'HIDDEN', 'SKIP_SAVE'},
+            )
+
+    # Show only images/videos, and directories!
+    filter_blender = BoolProperty(
+            default=True,
+            options={'HIDDEN', 'SKIP_SAVE'},
+            )
+    filter_folder = BoolProperty(
+            default=True,
+            options={'HIDDEN', 'SKIP_SAVE'},
+            )
+
+    # -----------
+    # Own props.
+    use_scenes = BoolProperty(
+            default=True,
+            name="Scenes",
+            description="Generate scenes' previews",
+            )
+    use_groups = BoolProperty(
+            default=True,
+            name="Groups",
+            description="Generate groups' previews",
+            )
+    use_objects = BoolProperty(
+            default=True,
+            name="Objects",
+            description="Generate objects' previews",
+            )
+    use_intern_data = BoolProperty(
+            default=True,
+            name="Mat/Tex/...",
+            description="Generate 'internal' previews (materials, textures, images, etc.)",
+            )
+
+    use_trusted = BoolProperty(
+            default=False,
+            name="Trusted Blend Files",
+            description="Enable python evaluation for selected files",
+            )
+
+    def invoke(self, context, event):
+        context.window_manager.fileselect_add(self)
+        return {'RUNNING_MODAL'}
+
+    def execute(self, context):
+        if "subprocess" in locals():
+            import imp
+            imp.reload(preview_render)
+        else:
+            import os
+            import subprocess
+            from bl_previews_utils import bl_previews_render as preview_render
+
+        context.window_manager.progress_begin(0, len(self.files))
+        context.window_manager.progress_update(0)
+        for i, fn in enumerate(self.files):
+            blen_path = os.path.join(self.directory, fn.name)
+            cmd = [
+                bpy.app.binary_path,
+                "--background",
+                "--factory-startup",
+                "-noaudio",
+            ]
+            if self.use_trusted:
+                cmd.append("--enable-autoexec")
+            cmd.extend([
+                blen_path,
+                "--python",
+                os.path.join(os.path.dirname(preview_render.__file__), "bl_previews_render.py"),
+                "--",
+            ])
+            if not self.use_scenes:
+                cmd.append('--no_scenes')
+            if not self.use_groups:
+                cmd.append('--no_groups')
+            if not self.use_objects:
+                cmd.append('--no_objects')
+            if not self.use_intern_data:
+                cmd.append('--no_data_intern')
+            if subprocess.call(cmd):
+                self.report({'ERROR'}, "Previews generation process failed for file '%s'!" % blen_path)
+                context.window_manager.progress_end()
+                return {'CANCELLED'}
+            context.window_manager.progress_update(i + 1)
+        context.window_manager.progress_end()
+
+        return {'FINISHED'}
+
+
+class WM_OT_previews_batch_clear(Operator):
+    """Clear selected .blend file's previews"""
+    bl_idname = "wm.previews_batch_clear"
+    bl_label = "Batch-Clear Previews"
+    bl_options = {'REGISTER'}
+
+    # -----------
+    # File props.
+    files = CollectionProperty(
+            type=bpy.types.OperatorFileListElement,
+            options={'HIDDEN', 'SKIP_SAVE'},
+            )
+
+    directory = StringProperty(
+            maxlen=1024,
+            subtype='FILE_PATH',
+            options={'HIDDEN', 'SKIP_SAVE'},
+            )
+
+    # Show only images/videos, and directories!
+    filter_blender = BoolProperty(
+            default=True,
+            options={'HIDDEN', 'SKIP_SAVE'},
+            )
+    filter_folder = BoolProperty(
+            default=True,
+            options={'HIDDEN', 'SKIP_SAVE'},
+            )
+
+    # -----------
+    # Own props.
+    use_scenes = BoolProperty(
+            default=True,
+            name="Scenes",
+            description="Clear scenes' previews",
+            )
+    use_groups = BoolProperty(default=True,
+            name="Groups",
+            description="Clear groups' previews",
+            )
+    use_objects = BoolProperty(
+            default=True,
+            name="Objects",
+            description="Clear objects' previews",
+            )
+    use_intern_data = BoolProperty(
+            default=True,
+            name="Mat/Tex/...",
+            description="Clear 'internal' previews (materials, textures, images, etc.)",
+            )
+
+    use_trusted = BoolProperty(
+            default=False,
+            name="Trusted Blend Files",
+            description="Enable python evaluation for selected files",
+            )
+
+    def invoke(self, context, event):
+        context.window_manager.fileselect_add(self)
+        return {'RUNNING_MODAL'}
+
+    def execute(self, context):
+        if "subprocess" in locals():
+            import imp
+            imp.reload(preview_render)
+        else:
+            import os
+            import subprocess
+            from bl_previews_utils import bl_previews_render as preview_render
+
+        context.window_manager.progress_begin(0, len(self.files))
+        context.window_manager.progress_update(0)
+        for i, fn in enumerate(self.files):
+            blen_path = os.path.join(self.directory, fn.name)
+            cmd = [
+                bpy.app.binary_path,
+                "--background",
+                "--factory-startup",
+                "-noaudio",
+            ]
+            if self.use_trusted:
+                cmd.append("--enable-autoexec")
+            cmd.extend([
+                blen_path,
+                "--python",
+                os.path.join(os.path.dirname(preview_render.__file__), "bl_previews_render.py"),
+                "--",
+                "--clear",
+            ])
+            if not self.use_scenes:
+                cmd.append('--no_scenes')
+            if not self.use_groups:
+                cmd.append('--no_groups')
+            if not self.use_objects:
+                cmd.append('--no_objects')
+            if not self.use_intern_data:
+                cmd.append('--no_data_intern')
+            if subprocess.call(cmd):
+                self.report({'ERROR'}, "Previews clear process failed for file '%s'!" % blen_path)
+                context.window_manager.progress_end()
+                return {'CANCELLED'}
+            context.window_manager.progress_update(i + 1)
+        context.window_manager.progress_end()
+
+        return {'FINISHED'}
+
diff --git a/release/scripts/startup/bl_ui/space_info.py b/release/scripts/startup/bl_ui/space_info.py
index 48a1b28289e..d295cc19fb7 100644
--- a/release/scripts/startup/bl_ui/space_info.py
+++ b/release/scripts/startup/bl_ui/space_info.py
@@ -203,6 +203,12 @@ class INFO_MT_file_previews(Menu):
         layout = self.layout
 
         layout.operator("wm.previews_ensure")
+        layout.operator("wm.previews_batch_generate")
+
+        layout.separator()
+
+        layout.operator("wm.previews_clear")
+        layout.operator("wm.previews_batch_clear")
 
 
 class INFO_MT_game(Menu):