From: Christian Heller Date: Sun, 24 Sep 2023 17:40:26 +0000 (+0200) Subject: Bookmaker: improve string formatting handling. X-Git-Url: https://plomlompom.com/repos/%7B%7Bdb.prefix%7D%7D/%7B%7B%20web_path%20%7D%7D/add_task?a=commitdiff_plain;h=2180d2073c33449159b2bf4ff0289ab809ae2f95;p=misc Bookmaker: improve string formatting handling. --- diff --git a/bookmaker.py b/bookmaker.py index 868866e..25e8599 100755 --- a/bookmaker.py +++ b/bookmaker.py @@ -65,7 +65,7 @@ import os import sys def handled_error_exit(msg): - print("ERROR:", msg) + print(f"ERROR: {msg}") sys.exit(1) try: @@ -88,12 +88,12 @@ class HandledException(Exception): pass def validate_page_range(p_string, err_msg_prefix): - err_msg = "%s: invalid page range string: %s" % (err_msg_prefix, p_string) + prefix = f"{err_msg_prefix}: page range string" if '-' not in p_string: - raise HandledException("%s: page range string lacks '-': %s" % (err_msg_prefix, p_string)) + raise HandledException(f"{prefix} lacks '-': {p_string}") tokens = p_string.split("-") if len(tokens) > 2: - raise HandledException("%s: page range string has too many '-': %s" % (err_msg_prefix, p_string)) + raise HandledException(f"{prefix} has too many '-': {p_string}") for i, token in enumerate(tokens): if token == "": continue @@ -104,9 +104,9 @@ def validate_page_range(p_string, err_msg_prefix): try: int(token) except ValueError: - raise HandledException("%s: page range string carries values that are neither integer, nor 'start', nor 'end': %s" % (err_msg_prefix, p_string)) + raise HandledException(f"{prefix} carries value neither integer, nor 'start', nor 'end': {p_string}") if int(token) < 1: - raise HandledException("%s: page range string may not carry page numbers <1: %s" % (err_msg_prefix, p_string)) + raise HandledException(f"{prefix} carries page number <1: {p_string}") start = -1 end = -1 try: @@ -115,7 +115,7 @@ def validate_page_range(p_string, err_msg_prefix): except ValueError: pass if start > 0 and end > 0 and start > end: - raise HandledException("%s: page range starts higher than it ends: %s" % (err_msg_prefix, p_string)) + raise HandledException(f"{prefix} has higher start than end value: {p_string}") def split_crops_string(c_string): initial_split = c_string.split(':') @@ -154,45 +154,45 @@ def parse_args(): # some basic input validation for filename in args.input_file: if not os.path.isfile(filename): - raise HandledException("-i: %s is not a file" % filename) + raise HandledException(f"-i: {filename} is not a file") try: with open(filename, 'rb') as file: pypdf.PdfReader(file) except pypdf.errors.PdfStreamError: - raise HandledException("-i: cannot interpret %s as PDF file" % filename) + raise HandledException(f"-i: cannot interpret {filename} as PDF file") if args.page_range: for p_string in args.page_range: validate_page_range(p_string, "-p") if len(args.page_range) > len(args.input_file): - raise HandledException("more -p arguments than -i arguments") + raise HandledException("-p: more --page_range arguments than --input_file arguments") if args.crops: for c_string in args.crops: initial_split = c_string.split(':') if len(initial_split) > 2: - raise HandledException("-c: cropping string has multiple ':': %s" % c_string) + raise HandledException(f"-c: cropping string has multiple ':': {c_string}") page_range, crops = split_crops_string(c_string) crops = crops.split(",") if page_range: validate_page_range(page_range, "-c") if len(crops) != 4: - raise HandledException("-c: cropping should contain three ',': %s" % c_string) + raise HandledException(f"-c: cropping does not contain exactly three ',': {c_string}") for crop in crops: try: float(crop) except ValueError: - raise HandledException("-c: non-number crop in %s" % c_string) + raise HandledException(f"-c: non-number crop in: {c_string}") if args.rotate_page: for r in args.rotate_page: try: int(r) except ValueError: - raise HandledException("-r: non-integer value: %s" % r) + raise HandledException(f"-r: non-integer value: {r}") if r < 1: - raise HandledException("-r: value must not be <1: %s" % r) + raise HandledException(f"-r: value must not be <1: {r}") try: float(args.print_margin) except ValueError: - raise HandledException("-m: non-float value: %s" % arg.print_margin) + raise HandledException(f"-m: non-float value: {arg.print_margin}") return args @@ -217,12 +217,12 @@ def main(): range_string = args.page_range[i] start_page, end_page = parse_page_range(range_string, reader.pages) if end_page > len(reader.pages): # no need to test start_page cause start_page > end_page is checked above - raise HandledException("-p: page range goes beyond pages of input file: %s" % range_string) + raise HandledException(f"-p: page range goes beyond pages of input file: {range_string}") for old_page_num in range(start_page, end_page): new_page_num += 1 page = reader.pages[old_page_num] pages_to_add += [page] - print("-i, -p: read in %s page number %d as new page %d" % (input_file, old_page_num+1, new_page_num)) + print(f"-i, -p: read in {input_file} page number {old_page_num+1} as new page {new_page_num}") # we can do some more input validations now that we know how many pages output should have if args.crops: @@ -231,11 +231,11 @@ def main(): if page_range: start, end = parse_page_range(page_range, pages_to_add) if end > len(pages_to_add): - raise HandledException("-c: page range goes beyond number of pages we're building: %s" % page_range) + raise HandledException(f"-c: page range goes beyond number of pages we're building: {page_range}") if args.rotate_page: for r in args.rotate_page: if r > len(pages_to_add): - raise HandledException("-r: page number beyond number of pages we're building: %d" % r) + raise HandledException(f"-r: page number beyond number of pages we're building: {r}") # rotate page canvas (as opposed to using PDF's /Rotate command) if args.rotate_page: @@ -244,13 +244,13 @@ def main(): page.add_transformation(pypdf.Transformation().translate(tx=-A4_WIDTH/2, ty=-A4_HEIGHT/2)) page.add_transformation(pypdf.Transformation().rotate(-90)) page.add_transformation(pypdf.Transformation().translate(tx=A4_WIDTH/2, ty=A4_HEIGHT/2)) - print("-r: rotating (by 90°) page", rotate_page) + print(f"-r: rotating (by 90°) page {rotate_page}") # if necessary, pad pages to multiple of 8 if args.nup4: mod_to_8 = len(pages_to_add) % 8 if mod_to_8 > 0: - print("-n: number of input pages %d not multiple of 8, padding to that" % len(pages_to_add)) + print(f"-n: number of input pages {len(pages_to_add)} not multiple of 8, padding to that") for _ in range(8 - mod_to_8): new_page = pypdf.PageObject.create_blank_page(width=A4_WIDTH, height=A4_HEIGHT) pages_to_add += [new_page] @@ -277,10 +277,9 @@ def main(): crop_bottom = crop_bottom_cm * POINTS_PER_CM crop_right = crop_right_cm * POINTS_PER_CM crop_top = crop_top_cm * POINTS_PER_CM - if args.symmetry: - print("-c, -t: to pages %d to %d applying crops: left %.2fcm, bottom %.2fcm, right %.2fcm, top %.2fcm (but alternating left and right crop between even and odd pages)" % (start_page + 1, end_page, crop_left_cm, crop_bottom_cm, crop_right_cm, crop_top_cm)) - else: - print("-c: to pages %d to %d applying crops: left %.2fcm, bottom %.2fcm, right %.2fcm, top %.2fcm" % (start_page + 1, end_page, crop_left_cm, crop_bottom_cm, crop_right_cm, crop_top_cm)) + prefix = "-c, -t" if args.symmetry else "-c" + suffix = " (but alternating left and right crop between even and odd pages)" if args.symmetry else "" + print(f"{prefix}: to pages {start_page + 1} to {end_page} applying crops: left {crop_left_cm}cm, bottom {crop_bottom_cm}cm, right {crop_right_cm}cm, top {crop_top_cm}cm{suffix}") cropped_width = A4_WIDTH - crop_left - crop_right cropped_height = A4_HEIGHT - crop_bottom - crop_top zoom = 1 @@ -315,11 +314,11 @@ def main(): page.mediabox.top = cropped_height * zoom writer.add_page(page) odd_page = not odd_page - print("built page number %d (of %d)" % (i+1, len(pages_to_add))) + print(f"built page number {i+1} (of {len(pages_to_add)})") else: print("-n: building 4-input-pages-per-output-page book") - print("-m: applying printable-area margin of %.2fcm" % args.print_margin) + print(f"-m: applying printable-area margin of {args.print_margin}cm") if args.analyze: print("-a: drawing page borders, spine limits") n_pages_per_axis = 2 @@ -402,7 +401,7 @@ def main(): page.add_transformation(pypdf.Transformation().scale(section_scale_factor, section_scale_factor)) new_page.merge_page(page) page_count += 1 - print("merged page number %d (of %d)" % (page_count, len(pages_to_add))) + print(f"merged page number {page_count} (of {len(pages_to_add)})") i += 1 if i > 3: if args.analyze: @@ -429,7 +428,7 @@ def main(): packet = io.BytesIO() c = reportlab.pdfgen.canvas.Canvas(packet, pagesize=A4) if args.analyze: - # # spine lines + # spine lines c.setLineWidth(0.1) c.line(x_left_SPINE_LIMIT, A4_HEIGHT, x_left_SPINE_LIMIT, 0) c.line(x_right_SPINE_LIMIT, A4_HEIGHT, x_right_SPINE_LIMIT, 0)