Add darktable ghost publish plugin

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/user/gui/darktable/publish/src/exif.ts

@@ -0,0 +1,48 @@
+import { exiftool } from "exiftool-vendored";
+import type { FileInfo } from "./files";
+
+export interface ShootingConditions {
+  make: string;
+  model: string;
+  lensMake: string;
+  lensModel: string;
+  focalLength: string;
+  focalLength35: string;
+  shutterSpeed: string;
+  fStop: string;
+  iso: string;
+  timestamp: string;
+}
+
+export const extractShootingConditions = async (
+  fileInfo: FileInfo,
+): Promise<ShootingConditions> => {
+  const path = fileInfo.rawPath ?? fileInfo.jpegPath;
+
+  try {
+    const exifData = await exiftool.read(path);
+
+    return {
+      make: exifData.Make ?? "Unknown",
+      model: exifData.Model ?? "Unknown",
+      lensMake: exifData.LensMake ?? "Unknown",
+      lensModel: exifData.LensModel ?? "Unknown",
+      focalLength: exifData.FocalLength ?? "Unknown",
+      focalLength35: exifData.FocalLengthIn35mmFormat ?? "Unknown",
+      shutterSpeed: exifData.ExposureTime ?? "Unknown",
+      fStop: exifData.FNumber?.toString() ?? "Unknown",
+      iso: exifData.ISO?.toString() ?? "Unknown",
+      timestamp: new Date(
+        (exifData.CreateDate?.toString() as string).replace(/\./g, ":"),
+      ).toISOString(),
+    };
+  } catch (error: any) {
+    throw new Error(
+      `Failed to extract EXIF data from ${path}: ${error.message}`,
+    );
+  }
+};
+
+export const createImageCaption = (exif: ShootingConditions) => {
+  return `${exif.make} ${exif.model}, ${exif.lensMake} ${exif.lensModel} @ ${exif.focalLength} (${exif.focalLength35}), ${exif.shutterSpeed} s, f/${exif.fStop}, ISO ${exif.iso}`;
+};