Class: PdfParadise::DeleteLastPageOfThisPdfFile

Inherits:
Base
  • Object
show all
Defined in:
lib/pdf_paradise/utility_scripts/delete_last_page_of_this_pdf_file.rb

Constant Summary collapse

OVERWRITE_THE_OLD_PDF_FILE =
#

OVERWRITE_THE_OLD_PDF_FILE

If the following constant is set to true then the given input file will be overwritten.

#
true

Constants inherited from Base

Base::NAMESPACE

Instance Method Summary collapse

Methods inherited from Base

#basename, #be_verbose?, #change_directory, #commandline_arguments?, #copy_file, #delete_file, #e, #ecomment, #esystem, #first_argument?, #gold, #infer_the_namespace, #input_without_leading_hyphens?, #internal_hash?, #is_an_image_file?, #is_on_roebe?, #lightsteelblue, #log_dir?, #mkdir, #mv, #n_pages?, #namespace?, #no_file_at, #opne, #opnn, #orange, #reset_the_internal_hash, #return_commandline_arguments_starting_with_hyphens, #return_files_from_the_commandline_arguments, #return_pwd, #rev, #set_be_quiet, #set_commandline_arguments, #steelblue, #try_to_ensure_that_this_directory_exists, #write_what_into

Constructor Details

#initialize(input_files = ARGV, run_already = true) ⇒ DeleteLastPageOfThisPdfFile

#

initialize

#


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# File 'lib/pdf_paradise/utility_scripts/delete_last_page_of_this_pdf_file.rb', line 37

def initialize(
    input_files = ARGV,
    run_already = true
  )
  reset
  set_input_files(input_files)
  run if run_already
end

Instance Method Details

#input? ⇒ Boolean

#

input?

#

Returns:

  • (Boolean) 


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# File 'lib/pdf_paradise/utility_scripts/delete_last_page_of_this_pdf_file.rb', line 153

def input?
  @input_files
end

#name_of_the_output_file?(i) ⇒ Boolean Also known as: output?

#

name_of_the_output_file?

#

Returns:

  • (Boolean) 


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# File 'lib/pdf_paradise/utility_scripts/delete_last_page_of_this_pdf_file.rb', line 135

def name_of_the_output_file?(i)
  if @overwrite_the_old_pdf_file
    i.sub(/\.pdf$/,'')+'.pdf'
  else
    i.sub(/\.pdf$/,'')+'_output_file.pdf'
  end
end

#process_each_pdf ⇒ Object

#

process_each_pdf

#


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# File 'lib/pdf_paradise/utility_scripts/delete_last_page_of_this_pdf_file.rb', line 93

def process_each_pdf
  @input_files.each {|this_pdf_file|
    # ===================================================================== #
    # First, we must find out how many pdf pages are in the given
    # pdf file at hand.
    # ===================================================================== #
    if File.exist? this_pdf_file
      has_n_pages = ::PdfParadise.has_n_pages?(this_pdf_file)
      opne 'Now working on the .pdf file '+sfancy(this_pdf_file)+
           rev+' ('+steelblue(has_n_pages.to_s+' pages')+rev+')'
      has_n_pages = PdfParadise.n_pages_in_this_pdf_file?(this_pdf_file) # This is also the last page.
      if use_pdftk?
        _ = 'pdftk '+this_pdf_file+' cat 1-'+(has_n_pages.to_i - 1).to_s+' '+
             has_n_pages.to_s+'-end output '+
             name_of_the_output_file?(this_pdf_file)
      else # else we use qpdf
        _ = 'qpdf'.dup
        if @overwrite_the_old_pdf_file
          _ << ' --replace-input'
        end
        if @overwrite_the_old_pdf_file
          _ << ' --pages '+this_pdf_file+' 1-'+(has_n_pages.to_i - 1).to_s+' -- '+
               this_pdf_file
        else
          _ << ' --pages '+this_pdf_file+' 1-'+(has_n_pages.to_i - 1).to_s+' -- '+
               this_pdf_file+' '+name_of_the_output_file?(this_pdf_file)
        end
      end
      begin
        esystem _ # Need to rescue here, e. g. due to permission errors and what not.
      rescue Exception => error
        pp error
      end
    else
      opne 'No file exists at `'+sfile(this_pdf_file)+'`.'
    end
  }
end

#reset ⇒ Object

#

reset

#


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# File 'lib/pdf_paradise/utility_scripts/delete_last_page_of_this_pdf_file.rb', line 49

def reset
  super()
  infer_the_namespace
  # ======================================================================= #
  # === @overwrite_the_old_pdf_file
  # ======================================================================= #
  @overwrite_the_old_pdf_file = OVERWRITE_THE_OLD_PDF_FILE
end

#run ⇒ Object

#

run

#


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# File 'lib/pdf_paradise/utility_scripts/delete_last_page_of_this_pdf_file.rb', line 160

def run
  process_each_pdf
end

#sanitize_input_files ⇒ Object

#

sanitize_input_files

#


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# File 'lib/pdf_paradise/utility_scripts/delete_last_page_of_this_pdf_file.rb', line 79

def sanitize_input_files
  unless @input_files.empty?
    # ===================================================================== #
    # Select only .pdf files next.
    # ===================================================================== #
    @input_files.select! {|entry|
      entry.end_with? '.pdf'
    }
  end
end

#set_input_files(i) ⇒ Object

#

set_input_files

#


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# File 'lib/pdf_paradise/utility_scripts/delete_last_page_of_this_pdf_file.rb', line 61

def set_input_files(i)
  i = [i] unless i.is_a? Array
  if i.empty? and is_on_roebe?
    # ===================================================================== #
    # In this case we will use the main-pdf file, if it exists.
    # ===================================================================== #
    if ENV.has_key?('MAIN_BOOK') and
      File.exist?(ENV['MAIN_BOOK'])
      i << ENV['MAIN_BOOK'].dup
    end
  end
  @input_files = i
  sanitize_input_files
end

#use_pdftk? ⇒ Boolean

#

use_pdftk?

#

Returns:

  • (Boolean) 


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# File 'lib/pdf_paradise/utility_scripts/delete_last_page_of_this_pdf_file.rb', line 146

def use_pdftk?
  false
end