From 9bc4a0d7bfa703fb2ccb67e8290cf517ae72e16b Mon Sep 17 00:00:00 2001
From: Francesco Baldino <francesco.ghog@gmail.com>
Date: Fri, 19 May 2023 13:59:03 +0200
Subject: [PATCH] added bookletify

---
 README.md     |   5 +++
 bookletify.py | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 126 insertions(+)
 create mode 100755 bookletify.py

diff --git a/README.md b/README.md
index dc2cd67..8ce143d 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,11 @@ Questa repository contiene i seguenti script:
 
     Consente di impaginare un pdf in modo da poi poterlo stampare "a libretto"
 
+-   `bookletify` &mdash; [@Fran314](https://git.phc.dm.unipi.it/Fran314)
+
+    Simile a impagina, ma in python. Formatta un pdf in modo da poi poterlo stampare "a libretto" chiudendolo come un libro invece di sovrapporre una metà sull'altra.
+    Necessita di PyPDF2 installato con pip per funzionare
+
 -   `gobbino` &mdash; [@BachoSeven](https://git.phc.dm.unipi.it/BachoSeven) + [@Dilillo](http://poisson.phc.dm.unipi.it/~dilillo/Vario/index.html)
 
     Permette di scaricare video e/o pdf di qualsiasi corso presente sul sito del professor Gobbino
diff --git a/bookletify.py b/bookletify.py
new file mode 100755
index 0000000..4739346
--- /dev/null
+++ b/bookletify.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+from math import ceil
+from PyPDF2 import PdfReader, PdfWriter
+
+def main():
+    def print_help():
+        print('bookletify')
+        print()
+        print('USAGE')
+        print('    bookletify [OPTIONS] file')
+        print()
+        print('DESCRIPTION')
+        print('    Rearranges the pages of a pdf in order to print it as is (double')
+        print('    sided, flipped on the short edge) so that you can take it, cut  ')
+        print('    in half and close it like you would do with a book. The result  ')
+        print('    will be the original pdf in the correct order, with the size of ')
+        print('    half a page')
+        print('    Especially useful to print pdfs to A5 size on A4 paper')
+        print()
+        print('OPTIONS')
+        print('    -h    print help')
+        print('    -q    do not print anything to stdout')
+
+    def parse_argv():
+        opts = {
+            "h": False,
+            "q": False,
+        }
+        filename = None
+
+        if len(sys.argv) < 2:
+            opts["h"] = True
+
+        for arg in sys.argv[1:]:
+            if arg.startswith('-'):
+                for opt in opts:
+                    if opt in arg:
+                        opts[opt] = True
+            elif not filename:
+                filename = arg
+
+        return (opts, filename)
+
+    def info(text = '', end='\n'):
+        if not opts["q"]:
+            print(text, end=end)
+
+    def prog(curr, max_val):
+        # Overrides the current terminal line with a progressbar filled at curr/max_val
+        perc = float(curr) / float(max_val)
+        remaining = f'{curr:{len(str(max_val))}d}/{max_val}'
+        (cols, _) = os.get_terminal_size()
+        max_width = cols - len(remaining) - 3
+
+        size = min(max_width, max_val, 80)
+        bar = int(perc * size)
+
+        end = '\n' if curr == max_val else ''
+        info("\r|" + ("\u2588" * bar) + "_" * (size - bar) + "| " + remaining, end)
+
+
+    (opts, input_name) = parse_argv()
+    if opts["h"] or not input_name:
+        print_help()
+        exit(0)
+
+    if not os.path.isfile(input_name):
+        print(f'file {input_name} does not exist')
+        exit(1)
+    
+    output_name = f'{input_name}-rearranged'
+    if (input_name.endswith('.pdf')):
+        output_name = f'{input_name[0:-4]}-rearranged.pdf'
+    
+    
+    # Read the input
+    reader = PdfReader(input_name)
+    
+    # Write the result to a file
+    middle = PdfWriter()
+    info("Loading...")
+    n = len(reader.pages)
+    # Set m as the smallest multiple of 4 bigger or equal to n
+    m = ceil(n / 4) * 4
+
+    for i in range(n):
+        prog(i, m)
+        middle.add_page(reader.pages[i])
+    
+    for i in range(m - n):
+        prog(n + i, m)
+        middle.add_blank_page()
+    
+    prog(m, m)
+    
+    output = PdfWriter()
+    info()
+    info("Rearranging...")
+    for i in range(int(m / 4)):
+        mod = i * 2
+        prog(i * 4, m)
+        output.add_page(middle.pages[m - 1 - mod])
+        prog(i * 4 + 1, m)
+        output.add_page(middle.pages[mod])
+        prog(i * 4 + 2, m)
+        output.add_page(middle.pages[1 + mod])
+        prog(i * 4 + 3, m)
+        output.add_page(middle.pages[m - 2 - mod])
+    prog(m, m)
+    
+    info()
+    info("Saving...")
+    output.write(output_name)
+    info("Done!")
+    info()
+
+if __name__ == "__main__":
+    main()