[nodes] Add new InputFile input node

The node receives a file or directory as the input, and can be used
as the entry point of a graph for `meshroom_batch`

Author: cbentejac

meshroom/nodes/general/InputFile.py

@@ -0,0 +1,56 @@
+__version__ = "1.0"
+
+import logging
+import os
+
+from meshroom.core import desc
+
+class InputFile(desc.InputNode, desc.InitNode):
+    """
+This node is an input node that receives a File.
+"""
+    category = "Other"
+
+    inputs = [
+        desc.File(
+            name="inputFile",
+            label="Input File",
+            description="A file or folder to use as the input.",
+            value="",
+        )
+    ]
+
+    def initialize(self, node, inputs, recursiveInputs):
+        self.resetAttributes(node, ["inputFile"])
+
+        attributeSet = False
+        if len(inputs) >= 1:
+            for i in inputs:
+                if os.path.isfile(i) or os.path.isdir(i):
+                    self.setAttributes(node, {"inputFile": i})
+                    attributeSet = True
+
+                    if len(inputs) > 1:
+                        logging.warning(f"Several inputs were provided ({inputs}).")
+                        logging.warning(f"Only the first valid one ({i}) will be used.")
+
+                    break
+                else:
+                    logging.warning(f"{i} is not a valid file or directory.")
+
+        if not attributeSet and len(recursiveInputs) >= 1:
+            for i in recursiveInputs:
+                if os.path.isfile(i) or os.path.isdir(i):
+                    self.setAttributes(node, {"inputFile": i})
+                    attributeSet = True
+
+                    if len(recursiveInputs) > 1:
+                        logging.warning(f"Several recursive inputs were provided ({recursiveInputs}).")
+                        logging.warning(f"Only the first valid one ({i}) will be used.")
+
+                    break
+                else:
+                    logging.warning(f"{i} is not a valid file or directory.")
+
+        if not attributeSet:
+            logging.warning("No file has been set for 'inputFile'.")