aboutsummaryrefslogtreecommitdiffhomepage
path: root/lib/sisu/current/txt_rst.rb
blob: 238c0bb7659f0d300f0ebdde1c09a99f66045f2e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
# encoding: utf-8
=begin

* Name: SiSU

** Description: documents, structuring, processing, publishing, search
*** plaintext (smarttext) generation, rST

** Author: Ralph Amissah
  <ralph@amissah.com>
  <ralph.amissah@gmail.com>

** Copyright: (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
  2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Ralph Amissah,
  All Rights Reserved.

** License: GPL 3 or later:

  SiSU, a framework for document structuring, publishing and search

  Copyright (C) Ralph Amissah

  This program is free software: you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the Free
  Software Foundation, either version 3 of the License, or (at your option)
  any later version.

  This program is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program. If not, see <http://www.gnu.org/licenses/>.

  If you have Internet connection, the latest version of the GPL should be
  available at these locations:
  <http://www.fsf.org/licensing/licenses/gpl.html>
  <http://www.gnu.org/licenses/gpl.html>

  <http://www.sisudoc.org/sisu/en/manifest/gpl.fsf.html>

** SiSU uses:
  * Standard SiSU markup syntax,
  * Standard SiSU meta-markup syntax, and the
  * Standard SiSU object citation numbering and system

** Hompages:
  <http://www.jus.uio.no/sisu>
  <http://www.sisudoc.org>

** Git
  <http://git.sisudoc.org/gitweb/?p=code/sisu.git;a=summary>
  <http://git.sisudoc.org/gitweb/?p=code/sisu.git;a=blob;f=lib/sisu/current/plaintext_rst.rb;hb=HEAD>

=end
module SiSU_Txt_rST
  require_relative 'ao'                                 # ao.rb
  require_relative 'se'                                 # se.rb
    include SiSU_Env
  require_relative 'shared_metadata'                    # shared_metadata.rb
  require_relative 'generic_parts'                      # generic_parts.rb
  require_relative 'txt_shared'                         # txt_shared.rb
  include SiSU_Param
  @@alt_id_count,@@alt_id_count,@@tablehead,@@number_of_cols=0,0,0,0
  @@tablefoot=''
  class Source
    def initialize(opt)
      @opt=opt
      unless @opt.fns =~/(.+?)\.(?:-|ssm\.)?sst$/
        puts "#{sf} not a processed file type"
      end
    end
    def read
      begin
        md=SiSU_Param::Parameters.new(@opt).get
        env=SiSU_Env::InfoEnv.new(@opt.fns)
        unless @opt.act[:quiet][:set]==:on
          tool=(@opt.act[:verbose][:set]==:on \
          || @opt.act[:verbose_plus][:set]==:on \
          || @opt.act[:maintenance][:set]==:on) \
          ? "#{env.program.text_editor} #{md.file.output_path.rst.dir}/#{md.file.base_filename.rst}"
          : "[#{@opt.f_pth[:lng_is]}] #{@opt.fno}"
          (@opt.act[:verbose][:set]==:on \
          || @opt.act[:verbose_plus][:set]==:on \
          || @opt.act[:maintenance][:set]==:on) \
          ? SiSU_Screen::Ansi.new(
              @opt.act[:color_state][:set],
              'rST (plaintext utf-8)',
              tool
            ).green_hi_blue
          : SiSU_Screen::Ansi.new(
              @opt.act[:color_state][:set],
              'rST (plaintext utf-8)',
              tool
            ).green_title_hi
          if (@opt.act[:verbose_plus][:set]==:on \
          || @opt.act[:maintenance][:set]==:on)
            SiSU_Screen::Ansi.new(
              @opt.act[:color_state][:set],
              @opt.fns,
              "#{md.file.output_path.rst.dir}/#{md.file.base_filename.rst}"
            ).flow
          end
        end
        ao_array=SiSU_AO::Source.new(@opt).get # ao file drawn here
        wrap_width=if defined? md.make.plaintext_wrap \
        and md.make.plaintext_wrap
          md.make.plaintext_wrap
        elsif defined? env.plaintext_wrap \
        and env.plaintext_wrap
          env.plaintext_wrap
        else 78
        end
        #wrap_width=(defined? md.make.plaintext_wrap) ? md.make.plaintext_wrap : 78
        SiSU_Txt_rST::Source::Scroll.new(md,ao_array,wrap_width).songsheet
      rescue
        SiSU_Errors::Rescued.new($!,$@,@opt.selections.str,@opt.fns).location do
          __LINE__.to_s + ':' + __FILE__
        end
      ensure
      end
    end
    private
    class Scroll <Source
      include SiSU_Parts_Generic
      include SiSU_TextUtils
      @@endnotes={ para: [], end: [] }
      def initialize(md,data,wrap_width)
        @md,@data,@wrap_width=md,data,wrap_width
        @env=SiSU_Env::InfoEnv.new(@md.fns)
        @tab="\t"
        @@endnotes_=case md.opt.selections.str
        when /--footnote/ then false
        when /--endnote/  then true
        else                   true
        end
        @plaintext={ body: [], open: [], close: [], head: [], metadata: [], tail: [] }
      end
      def songsheet
        plaintext=markup(@data)
        publish(plaintext)
      end
      def break_line
        "\n"
      end
      # Used for extraction of endnotes from paragraphs
      def extract_endnotes(dob='')
        notes=dob.obj.scan(/(?:#{Mx[:en_a_o]}|#{Mx[:en_b_o]})([\d*+]+\s+.+?)(?:#{Mx[:en_a_c]}|#{Mx[:en_b_c]})/)
        @n=[]
        notes.flatten.each do |n| #high cost to deal with <br> appropriately within plaintext, consider
          n=n.dup.to_s
          if n =~/#{Mx[:br_line]}|#{Mx[:br_nl]}/
            fix = n.split(/#{Mx[:br_line]}|#{Mx[:br_nl]}/) #watch #added
            fix.each do |x|
              unless x.empty?; @n << x
              end
            end
          else                 @n << n
          end
        end
        notes=@n.flatten
        notes.each do |e|
          util=(e.to_s =~/^\[[\d*+]+\]:/) \
          ? (SiSU_TextUtils::Wrap.new(e.to_s,@wrap_width,4,1))
          : (SiSU_TextUtils::Wrap.new(e.to_s,@wrap_width,1,1))
          wrap=util.line_wrap
          wrap=if wrap =~ /^\s*[\d*+]+\s+.+?\s*\Z/m
            wrap.gsub(/^(\s*)([\d*+]+)\s+(.+?)\s*\Z/m, <<-GSUB
\\1[\\2]: \\3
              GSUB
            )
          else
            wrap.gsub(/^(.+)\Z/m, <<-GSUB
\\1
              GSUB
            )
          end
          @@endnotes[:para] << "-#{wrap}"
          @@endnotes[:end] << '' << wrap
        end
        @@endnotes
      end
      def plaintext_metadata
        array=SiSU_Metadata::Summary.new(@md).plaintext.metadata
        array.each do |meta|
          tag,inf=meta.scan(/^.+?:\s|.+/)
          if tag and inf
            util=SiSU_TextUtils::Wrap.new(inf,@wrap_width,15,1)
            txt=util.line_wrap
            @plaintext[:metadata] <<<<WOK

#{@tab}#{tag}#{txt}
WOK
          end
        end
      end
      def plaintext_tail
#       env=SiSU_Env::InfoEnv.new(@md.fns)
        generator="Generated by: #{@md.sisu_version[:project]} #{@md.sisu_version[:version]} of #{@md.sisu_version[:date_stamp]} (#{@md.sisu_version[:date]})"  if @md.sisu_version[:version]
        lastdone="Last Generated on: #{Time.now}"
        rubyv="Ruby version: #{@md.ruby_version}"
        sc=if @md.sc_info
          "Source file:    #{@md.sc_filename}#{break_line}Version number: #{@md.sc_number}#{break_line}Version date:   #{@md.sc_date}#{break_line}"
        else ''
        end
        @plaintext[:tail] <<<<WOK
#{break_line}
plaintext (plain text):
   #{@md.file.output_path.rst.url}/#{@md.file.base_filename.rst}#{break_line}
Other versions of this document: #{break_line}
manifest:
   #{@md.file.output_path.manifest.url}/#{@md.file.base_filename.manifest}#{break_line}
at:
   #{@md.file.output_path.base.url}#{break_line}

#{sc}
* #{generator}
* #{rubyv}
* #{lastdone}
* SiSU #{the_url.sisu_txt}
WOK
      end
      def decorate
        def heading
          def underscore
            def l0
              '='
            end
            def l1
              '-'
            end
            def l2
              '`'
            end
            def l3
              ':'
            end
            def l4
              "'"
            end
            def l5
              '"'
            end
            self
          end
          self
        end
        def bold
          def open
            '*'
          end
          def close
            '*'
          end
          self
        end
        def italics
          def open
            '/'
          end
          def close
            '/'
          end
          self
        end
        def underscore
          def open
            '_'
          end
          def close
            '_'
          end
          self
        end
       #def emphasis
       #  def open
       #    ''
       #  end
       #  def close
       #    ''
       #  end
       #  self
       #end
        def cite
          def open
            '"'
          end
          def close
            '"'
          end
          self
        end
        def insert
          def open
            '+'
          end
          def close
            '+'
          end
          self
        end
        def strike
          def open
            '-'
          end
          def close
            '-'
          end
          self
        end
        def superscript
          def open
            '^'
          end
          def close
            '^'
          end
          self
        end
        def subscript
          def open
            '['
          end
          def close
            ']'
          end
          self
        end
        def hilite
          def open
            '*'
          end
          def close
            '*'
          end
          self
        end
        def monospace
          def open
            '#'
          end
          def close
            '#'
          end
          self
        end
        self
      end
      def heading_decorated_underscore(dob,times,p_num)
        if dob.is==:heading
          #times=@wrap_width if times > @wrap_width
          case dob.lc
          when 0 then decorate.heading.underscore.l0*times + p_num << break_line*2
          when 1 then decorate.heading.underscore.l1*times + p_num << break_line*2
          when 2 then decorate.heading.underscore.l2*times + p_num << break_line*2
          when 3 then decorate.heading.underscore.l3*times + p_num << break_line*2
          when 4 then decorate.heading.underscore.l4*times + p_num << break_line*2
          when 5 then decorate.heading.underscore.l5*times + p_num << break_line*2
          when 6 then decorate.heading.underscore.l6*times + p_num << break_line*2
          end
        end
      end
      def plaintext_structure(dob='',p_num='') #% Used to extract the structure of a document
        util=nil
        wrapped=if dob.is==:para \
        || dob.is==:heading
          if dob.is==:heading
            util=SiSU_TextUtils::Wrap.new(dob.obj,@wrap_width,0)
          elsif dob.is==:para
            if dob.hang \
            and dob.hang =~/[0-9]/ \
            and dob.indent != dob.hang
              util=SiSU_TextUtils::Wrap.new(dob.obj,@wrap_width,dob.indent.to_i*2,dob.hang.to_i*2)
              #util=SiSU_TextUtils::Wrap.new(dob.obj,@wrap_width,dob.hang.to_i*2,0)
            elsif dob.indent =~/[1-9]/
              util=if dob.bullet_
                SiSU_TextUtils::Wrap.new("* #{dob.obj}",@wrap_width,dob.indent.to_i*2)
              else SiSU_TextUtils::Wrap.new(dob.obj,@wrap_width,dob.indent.to_i*2)
              end
            else
              util=if dob.bullet_
                SiSU_TextUtils::Wrap.new("* #{dob.obj}",@wrap_width,0)
              else SiSU_TextUtils::Wrap.new(dob.obj,@wrap_width,0)
              end
            end
          else util=SiSU_TextUtils::Wrap.new(dob.obj,@wrap_width,0)
          end
          dob.is==:heading ? util.no_wrap_no_breaks : util.line_wrap
        end
        if dob.is==:heading
          @plaintext[:body] << wrapped + p_num # main text, contents, body KEEP
          @plaintext[:body] << heading_decorated_underscore(dob,wrapped.length,p_num)
        else
          @plaintext[:body] << wrapped + p_num << break_line # main text, contents, body KEEP
        end
        if @@endnotes[:para] \
        and not @@endnotes_
          @@endnotes[:para].each {|e| @plaintext[:body] << e << break_line}
        elsif @@endnotes[:para] \
        and @@endnotes_
        end
        @@endnotes[:para]=[]
      end
      def markup(data)                                                       # Used for major markup instructions
        SiSU_Env::InfoEnv.new(@md.fns)
        @data_mod,@endnotes,@level,@cont,@copen,@plaintext_contents_close=Array.new(6){[]}
        (0..6).each { |x| @cont[x]=@level[x]=false }
        (4..6).each { |x| @plaintext_contents_close[x]='' }
        plaintext_tail #($1,$2)
        plaintext_metadata
        table_message='[table conversion awaited, see other document formats]'
        data.each do |dob|
          dob.obj=dob.obj.gsub(/#{Mx[:gr_o]}Th?#{Mx[:tc_p]}.+/um,"#{break_line}#{table_message}"). #fix
            gsub(/.+?#{Mx[:gl_o]}-##{Mx[:gl_c]}/,'').                              # remove dummy headings (used by html) #check also [~-]#
            gsub(/#{Mx[:fa_bold_o]}(.+?)#{Mx[:fa_bold_c]}/,
              "#{decorate.bold.open}\\1#{decorate.bold.close}").
            gsub(/#{Mx[:fa_italics_o]}(.+?)#{Mx[:fa_italics_c]}/,
              "#{decorate.italics.open}\\1#{decorate.italics.close}").
            gsub(/#{Mx[:fa_underscore_o]}(.+?)#{Mx[:fa_underscore_c]}/,
              "#{decorate.underscore.open}\\1#{decorate.underscore.close}").
            gsub(/#{Mx[:fa_subscript_o]}(.+?)#{Mx[:fa_subscript_c]}/,
              "#{decorate.subscript.open}\\1#{decorate.subscript.close}").
            gsub(/#{Mx[:fa_superscript_o]}(.+?)#{Mx[:fa_superscript_c]}/,
              "#{decorate.superscript.open}\\1#{decorate.superscript.close}").
            gsub(/#{Mx[:fa_insert_o]}(.+?)#{Mx[:fa_insert_c]}/,
              "#{decorate.insert.open}\\1#{decorate.insert.close}").
            gsub(/#{Mx[:fa_cite_o]}(.+?)#{Mx[:fa_cite_c]}/,
              "#{decorate.cite.open}\\1#{decorate.cite.close}").
            gsub(/#{Mx[:fa_strike_o]}(.+?)#{Mx[:fa_strike_c]}/,
              "#{decorate.strike.open}\\1#{decorate.strike.close}").
            gsub(/#{Mx[:fa_monospace_o]}(.+?)#{Mx[:fa_monospace_c]}/,
              "#{decorate.monospace.open}\\1#{decorate.monospace.close}")
          unless dob.is==:code
            dob.obj=dob.obj.gsub(/#{Mx[:lnk_o]}(.+?)#{Mx[:lnk_c]}#{Mx[:rel_o]}\S+?#{Mx[:rel_c]}/,'\1').
              gsub(/#{Mx[:url_o]}_(\S+?)#{Mx[:url_c]}/,'\1').
              gsub(/#{Mx[:lnk_o]}(.+?)#{Mx[:lnk_c]}#{Mx[:url_o]}(\S+?)#{Mx[:url_c]}/,'\1 [link: <\2>]').
              gsub(/#{Mx[:lnk_o]}(.+?)#{Mx[:lnk_c]}image/,'\1 [link: local image]').
              gsub(/#{Mx[:url_o]}(\S+?)#{Mx[:url_c]}/,"#{the_text.url_open}\\1#{the_text.url_close}")
            extract_endnotes(dob)
            dob.obj=dob.obj.gsub(/#{Mx[:en_a_o]}([\d*+]+)\s+(?:.+?)#{Mx[:en_a_c]}/,'[^\1]'). # endnote marker marked up
              gsub(/#{Mx[:en_b_o]}([\d*+]+)\s+(?:.+?)#{Mx[:en_b_c]}/,'[^\1]'). # endnote marker marked up
              gsub(/#{Mx[:gl_o]}(?:#lt|#060)#{Mx[:gl_c]}/,'<').
              gsub(/#{Mx[:gl_o]}(?:#gt|#062)#{Mx[:gl_c]}/,'>').
              gsub(/#{Mx[:gl_o]}#(?:038|amp)#{Mx[:gl_c]}/,'&').
              gsub(/#{Mx[:gl_o]}#033#{Mx[:gl_c]}/,'!').
              gsub(/#{Mx[:gl_o]}#035#{Mx[:gl_c]}/,'#').
              gsub(/#{Mx[:gl_o]}#042#{Mx[:gl_c]}/,'*').
              gsub(/#{Mx[:gl_o]}#045#{Mx[:gl_c]}/,'-').
              gsub(/#{Mx[:gl_o]}#047#{Mx[:gl_c]}/,'/').
              gsub(/#{Mx[:gl_o]}#095#{Mx[:gl_c]}/,'_').
              gsub(/#{Mx[:gl_o]}#123#{Mx[:gl_c]}/,'{').
              gsub(/#{Mx[:gl_o]}#125#{Mx[:gl_c]}/,'}').
              gsub(/#{Mx[:gl_o]}#126#{Mx[:gl_c]}/,'~').
              gsub(/#{Mx[:gl_o]}#169#{Mx[:gl_c]}/,'©').
              gsub(/#{Mx[:gl_o]}#092#{Mx[:gl_c]}/,'\\')
          end
          dob.obj=if dob.of==:block                                   # watch
            dob.obj.gsub(/#{Mx[:gl_o]}#{Mx[:gl_c]}/m,"* ").
              gsub(/\n?#{Mx[:br_line]}\n?|\n?#{Mx[:br_nl]}\n?/m,break_line)
          else dob.obj.gsub(/\n?#{Mx[:br_line]}\n?|\n?#{Mx[:br_nl]}\n?/m,break_line*2)
          end
          if dob.is==:code
            dob.obj=dob.obj.gsub(/(^|[^}])_([<>])/m,'\1\2'). # _> _<
              gsub(/(^|[^}])_([<>])/m,'\1\2') # _<_<
          end
          dob.obj=dob.obj.gsub(/#{Mx[:url_o]}_(\S+?)#{Mx[:url_c]}/,'\1').
            gsub(/<a href=".+?">(.+?)<\/a>/m,'\1').
            gsub(/#{Mx[:mk_o]}:name#(\S+?)#{Mx[:mk_c]}/,'').                       # remove name links
            gsub(/&nbsp;|#{Mx[:nbsp]}/,' ').                                       # decide on
            gsub(/(?:^|[^_\\])#{Mx[:lnk_o]}(\S+?\.(?:png|jpg|gif)) .+?#{Mx[:lnk_c]}#{Mx[:url_o]}\S+?#{Mx[:url_c]}/,'    [ \1 ]'). #"[ #{dir.url.images_local}\/\\1 ]")
            gsub(/(?:^|[^_\\])#{Mx[:lnk_o]}(\S+?\.(?:png|jpg|gif)) .+?#{Mx[:lnk_c]}image/,'    [ \1 ]').
            gsub(/(?:^|[^_\\])\{\s*\S+?\.(?:png|jpg|gif)\s+.+?"(.*?)"\s*\}\S+/,'[image: "\1"]')
          if dob.obj !~/(^#{Rx[:meta]}|#{Mx[:br_eof]}|#{Mx[:br_endnotes]})/
            p_num=''
            #ocn
            if dob.is==:heading \
            or dob.is==:para
              plaintext_structure(dob,p_num)
            elsif dob.is==:group \
            or dob.is==:block \
            or dob.is==:verse \
            or dob.is==:code \
            or dob.is==:table
              @plaintext[:body] << dob.obj + p_num << break_line
            elsif dob.is==:break
              sp=' '
              ln='-'
              @plaintext[:body] <<=if dob.obj==Mx[:br_page] \
              or dob.obj==Mx[:br_page_new] \
              or dob.obj==Mx[:br_page_line]
                "#{break_line}#{ln*40}#{break_line*2}"
              elsif dob.obj ==Mx[:br_obj]
                "#{break_line}#{sp*20}*  *  *#{break_line*2}"
              end # following empty line (break_line) missing, fix
            end
            dob='' if (dob.obj =~/<a name="n\d+">/ \
              and dob.obj =~/^(-\{{2}~\d+|<!e[:_]\d+!>)/) # -endnote
            if dob ## Clean Prepared Text
              dob.obj=dob.obj.gsub(/<!.+!>/,' ').
                gsub(/<:\S+>/,' ')
            end
          end
        end
        @plaintext
      end
      def publish(plaintext)
        divider='='
        content=[]
        content << plaintext[:open]
        content << plaintext[:head]
        content << plaintext[:body]
        content << @@endnotes[:end] if @@endnotes_
        content << "#{break_line}#{divider*@wrap_width}#{break_line}"
        content << plaintext[:metadata]
        content << "#{break_line}#{divider*@wrap_width}#{break_line}" if @md.stmp =~/\w+/ #not used?
        content << plaintext[:tail]
        Output.new(content,@md).rst
        @@endnotes={ para: [], end: [] }
      end
    end
    class Output <Source
      include SiSU_Param
      include SiSU_Env
      def initialize(content,md)
        @content,@md=content,md
      end
      def rst
        file_plaintext=SiSU_Env::FileOp.new(@md).write_file.rst
        @sisu=[]
        emptyline=0
        @content.each do |para|                                                # this is a hack
          if para.is_a?(Array) \
          and para.length > 0
            para.each do |line|
              if line
                line=line.gsub(/[ \t]+$/m,'').
                  gsub(/^\A[ ]*\Z/m,'')
                (line=~/^\A\Z/) \
                ? (emptyline+=1)
                : emptyline=0
                if emptyline < 2                     #remove additional empty lines
                  file_plaintext.puts line
                end
              end
            end
          else file_plaintext.puts para          #unix plaintext # /^([*=-]|\.){5}/
          end
        end
        file_plaintext.close
      end
    end
  end
end
__END__