1 files changed, 99 insertions, 0 deletions
diff --git a/src/slidepacker b/src/slidepacker
new file mode 100755
index 0000000..d129d17
--- /dev/null
+++ b/src/slidepacker
@@ -0,0 +1,99 @@
+#!/usr/bin/env python3
+
+# slidepacker - convert pdf presentations into a "fake" pptx
+# (each page is rendered as an image and pasted onto a blank slide)
+
+import argparse
+import io
+import os
+import sys
+
+import fitz  # this is actually pymupdf
+from pptx import Presentation
+from pptx.util import Emu
+
+
+# core conversion
+def pack(pdf_path, output_path=None, dpi=150):
+    """convert a pdf to a pptx where each slide is a rendered page image.
+
+    args:
+        pdf_path:    path to the input pdf
+        output_path: path for the output pptx (default: same stem as pdf)
+        dpi:         render resolution (default: 150)
+
+    returns:
+        the output path as a string
+    """
+    if output_path is None:
+        base = os.path.splitext(pdf_path)[0]
+        output_path = base + ".pptx"
+
+    doc = fitz.open(pdf_path)
+    prs = Presentation()
+
+    # match slide dimensions to the first page
+    # fitz uses points (1pt = 1/72 inch), pptx uses emu (914400 emu/inch)
+    if len(doc) > 0:
+        rect = doc[0].rect
+        prs.slide_width = Emu(int(rect.width / 72 * 914400))
+        prs.slide_height = Emu(int(rect.height / 72 * 914400))
+
+    blank_layout = prs.slide_layouts[6]  # blank slide - no placeholders
+    mat = fitz.Matrix(dpi / 72, dpi / 72)
+
+    for page in doc:
+        pix = page.get_pixmap(matrix=mat)
+        img_stream = io.BytesIO(pix.tobytes("png"))
+
+        slide = prs.slides.add_slide(blank_layout)
+        slide.shapes.add_picture(
+            img_stream,
+            left=Emu(0),
+            top=Emu(0),
+            width=prs.slide_width,
+            height=prs.slide_height,
+        )
+
+    prs.save(output_path)
+    doc.close()
+    return output_path
+
+
+# cli
+
+def main():
+    parser = argparse.ArgumentParser(
+        prog="slidepacker",
+        description="convert a pdf presentation into a fake pptx",
+    )
+    parser.add_argument("pdf", help="input pdf file")
+    parser.add_argument(
+        "output",
+        nargs="?",
+        default=None,
+        help="output pptx file (default: same stem as input pdf)",
+    )
+    parser.add_argument(
+        "--dpi",
+        type=int,
+        default=150,
+        metavar="N",
+        help="render resolution in dpi (default: 150)",
+    )
+    args = parser.parse_args()
+
+    if not os.path.isfile(args.pdf):
+        print(f"[!] error: file not found: {args.pdf}", file=sys.stderr)
+        sys.exit(1)
+
+    if not args.pdf.lower().endswith(".pdf"):
+        print(f"[!] error: not a pdf file: {args.pdf}", file=sys.stderr)
+        sys.exit(1)
+
+    result = pack(args.pdf, args.output, dpi=args.dpi)
+    print(f"[+] saved: {result}")
+
+
+if __name__ == "__main__":
+    main()