From 51d8aac2c48fd80b79383bc0c5dcf94803a73919 Mon Sep 17 00:00:00 2001
From: Nicolas Predella <nicolas@predella.me>
Date: Thu, 21 May 2026 19:38:35 +0300
Subject: [PATCH] preview

---
 core/nodeslicer/nodes.py | 68 ++++++++++++++++++++++++++++++++++++++++
 core/nodeslicer/tree.py  |  1 +
 doc/NODES.md             |  3 ++
 3 files changed, 72 insertions(+)

diff --git a/core/nodeslicer/nodes.py b/core/nodeslicer/nodes.py
index b467946..40ad2b4 100644
--- a/core/nodeslicer/nodes.py
+++ b/core/nodeslicer/nodes.py
@@ -1455,6 +1455,74 @@ class SLICENODE_PrusaslicerSlice(SliceNode):
 
         return 'ok'
 
+@register_class
+class SLICENODE_PrusaslicerPreview(ExecSliceNode):
+    bl_label = "PrusaSlicer Preview"
+    button_label = "Open Preview"
+
+    prusaslicer_executable: NfStringProperty(
+        name="PrusaSlicer Path", 
+        subtype='FILE_PATH', 
+        default='flatpak run com.prusa3d.PrusaSlicer'
+    ) # pyright: ignore[reportInvalidTypeForm]
+
+    def init(self, context):
+        self._init_exec()
+        self.add_input("SLICESOCK_Gcode", "Gcode")
+
+    def draw_buttons(self, context, layout):
+        super().draw_buttons(context, layout)
+        layout.prop(self, "prusaslicer_executable")
+
+    def evaluate(self, operator=None):
+        gcode: str = self.resolve("Gcode")
+        if not gcode:
+            if operator: operator.report({'ERROR'}, "No Gcode to preview")
+            return 'no gcode'
+
+        exe_str = self.prusaslicer_executable
+        if not exe_str:
+            if operator: operator.report({'ERROR'}, "PrusaSlicer executable path is empty")
+            return 'error'
+
+        # Parse command (handles multi-word commands like flatpak)
+        cmd_parts = shlex.split(exe_str)
+        if not cmd_parts:
+            if operator: operator.report({'ERROR'}, "Invalid PrusaSlicer command")
+            return 'error'
+
+        # Try to resolve the first part as a path if it's not a command in PATH
+        if not shutil.which(cmd_parts[0]):
+            abs_path = bpy.path.abspath(cmd_parts[0])
+            if os.path.exists(abs_path):
+                cmd_parts[0] = abs_path
+        
+        # Final check if command exists
+        if not shutil.which(cmd_parts[0]):
+            if operator: operator.report({'ERROR'}, f"Command or executable not found: {cmd_parts[0]}")
+            return 'error'
+
+        # Write to temp file
+        # We use a named temporary file that stays around for a bit.
+        # PrusaSlicer needs the file to exist when it starts.
+        fd, temp_path = tempfile.mkstemp(suffix='.gcode')
+        try:
+            with os.fdopen(fd, 'w', encoding='utf-8') as f:
+                f.write(gcode)
+            
+            cmd = cmd_parts + ["--gcodeviewer", temp_path]
+            
+            # Use Popen to not block Blender
+            subprocess.Popen(cmd)
+            
+            if operator: 
+                operator.report({'INFO'}, f"PrusaSlicer Preview launched")
+        except Exception as e:
+            if operator: operator.report({'ERROR'}, f"Failed to launch preview: {str(e)}")
+            return 'error'
+
+        return 'ok'
+
 @register_class
 class SLICENODE_GcodeToMesh(ExecSliceNode):
     bl_label = "Gcode Preview"
diff --git a/core/nodeslicer/tree.py b/core/nodeslicer/tree.py
index 678f461..29515b2 100644
--- a/core/nodeslicer/tree.py
+++ b/core/nodeslicer/tree.py
@@ -228,6 +228,7 @@ class SLICENODE_MT_ActionIO(Menu):
         layout.operator("node.add_node", text="Airtable Submit").type = "SLICENODE_AirtableSubmit"
         layout.separator()
         layout.operator("node.add_node", text="Gcode Preview").type = "SLICENODE_GcodeToMesh"
+        layout.operator("node.add_node", text="PrusaSlicer Preview").type = "SLICENODE_PrusaslicerPreview"
         layout.operator("node.add_node", text="PrusaSlicer Slice").type = "SLICENODE_PrusaslicerSlice"
         layout.operator("node.add_node", text="Executor").type = "SLICENODE_Executor"
         layout.operator("node.add_node", text="Test").type = "SLICENODE_Test"
diff --git a/doc/NODES.md b/doc/NODES.md
index 9eab4a3..fb82fc5 100644
--- a/doc/NODES.md
+++ b/doc/NODES.md
@@ -94,4 +94,7 @@ All nodes are found in the **Add (Shift+A)** menu under the **SliceNodes** categ
     - **Gcode**: Output socket providing the generated G-code string.
 - **Gcode to Text Block**: Creates a new Blender text block containing the G-code and opens it in any active text editors.
 - **Gcode Preview**: Decodes G-code and creates a Blender mesh ("Debug" object) for visualization. 
+- **PrusaSlicer Preview**: Launches PrusaSlicer's built-in G-code viewer to visualize a G-code string.
+    - **Executable**: Path to the PrusaSlicer executable (default: `flatpak run com.prusa3d.PrusaSlicer`).
+    - **Gcode**: Input socket for the G-code string to preview.
 - **Test**: Triggers evaluation for debugging purposes.