Coverage for bookbuilderpy/pdf.py: 30%

1"""Post-process PDF files.""" 

2 

3from os.path import dirname, exists 

4 

5from bookbuilderpy.logger import logger 

6from bookbuilderpy.path import Path 

7from bookbuilderpy.shell import shell 

8from bookbuilderpy.versions import TOOL_GHOSTSCRIPT, has_tool 

9 

10 

11def pdf_postprocess(in_file: str, 

12 out_file: str, 

13 overwrite: bool = False) -> Path: 

14 """ 

15 Post-process a pdf file. 

16 

17 :param in_file: the input file 

18 :param out_file: the output file 

19 :param overwrite: should the output file be overwritten if it exists? 

20 :return: the output file 

21 """ 

22 source = Path.file(in_file) 

23 output = Path.path(out_file) 

24 if (not overwrite) and exists(output): 

25 raise ValueError(f"Output file '{output}' already exists.") 

26 if source == output: 

27 raise ValueError(f"Input and output file is the same: '{source}'.") 

28 

29 if has_tool(TOOL_GHOSTSCRIPT): 

30 logger(f"Post-processing pdf file '{source}' to '{output}' " 

31 f"by applying '{TOOL_GHOSTSCRIPT}'.") 

32 

33 cmd = [TOOL_GHOSTSCRIPT, 

34 "-q", 

35 "-dPrinted=false", 

36 "-dEmbedAllFonts=true", 

37 "-dSubsetFonts=true", 

38 "-dCompressFonts=true", 

39 "-dCompressStreams=true", 

40 "-dOptimize=true", 

41 "-dUNROLLFORMS", 

42 "-dCompatibilityLevel=1.7", 

43 "-dLZWEncodePages=true", 

44 "-dCompressPages=true", 

45 "-dPassThroughJPEGImages=true", 

46 "-dPassThroughJPXImages=true", 

47 "-dCannotEmbedFontPolicy=/Error", 

48 "-dPreserveCopyPage=false", 

49 "-dPreserveEPSInfo=false", 

50 "-dPreserveHalftoneInfo=false", 

51 "-dPreserveOPIComments=false", 

52 "-dPreserveOverprintSettings=false", 

53 "-dPreserveSeparation=false", 

54 "-dPreserveDeviceN=false", 

55 "-dMaxBitmap=2147483647", 

56 "-dDownsampleMonoImages=false", 

57 "-dDownsampleGrayImages=false", 

58 "-dDownsampleColorImages=false", 

59 "-dDetectDuplicateImages=true", 

60 "-dHaveTransparency=true", 

61 "-dAutoFilterColorImages=false", 

62 "-dAutoFilterGrayImages=false", 

63 "-dColorImageFilter=/FlateEncode", 

64 "-dGrayImageFilter=/FlateEncode", 

65 "-dColorConversionStrategy=/LeaveColorUnchanged", 

66 "-dFastWebView=false", 

67 "-dNOPAUSE", 

68 "-dQUIET", 

69 "-dBATCH", 

70 "-dSAFER", 

71 "-sDEVICE=pdfwrite", 

72 "-dAutoRotatePages=/PageByPage", 

73 f'-sOutputFile="{output}"', 

74 source, 

75 '-c "<</NeverEmbed [ ]>> setdistillerparams"'] 

76 shell(cmd, timeout=600, cwd=dirname(source)) 

77 else: 

78 logger(f"'{TOOL_GHOSTSCRIPT}' not installed, copying files directly.") 

79 Path.copy_file(source, output) 

80 

81 output.enforce_file() 

82 

83 return output