sample/trick2018/: adds the top-five entries of TRICK 2018

See https://github.com/tric/trick2018 for TRICK 2018.
Fixes #14930.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64008 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

21 files changed, 372 insertions, 0 deletions

diff --git a/sample/trick2018/01-kinaba/authors.markdown b/sample/trick2018/01-kinaba/authors.markdown
new file mode 100644
index 0000000000..d0df0b379d
--- /dev/null
+++ b/sample/trick2018/01-kinaba/authors.markdown
@@ -0,0 +1,3 @@
+* kinaba
+  * twitter.com/kinaba
+  * cctld: jp
diff --git a/sample/trick2018/01-kinaba/entry.rb b/sample/trick2018/01-kinaba/entry.rb
new file mode 100644
index 0000000000..eb8284d5ab
--- /dev/null
+++ b/sample/trick2018/01-kinaba/entry.rb
@@ -0,0 +1,8 @@
+alias    BEGIN    for      unless   def      class
+super    true     or       return   defined? next
+break    while    begin    undef    do       end
+rescue   then     retry    else     undef    module
+nil      ensure   case     if       yield    __LINE__
+self     and      redo     elsif    not      __FILE__
+alias    END      in       end      when     __ENCODING__
+end      until    false    end
diff --git a/sample/trick2018/01-kinaba/remarks.markdown b/sample/trick2018/01-kinaba/remarks.markdown
new file mode 100644
index 0000000000..a1a05bfd73
--- /dev/null
+++ b/sample/trick2018/01-kinaba/remarks.markdown
@@ -0,0 +1,55 @@
+### Remarks
+
+Just run it with no argument:
+
+    ruby entry.rb
+
+(Anyway it is just a no-op program. The above command only verifies
+that entry.rb is a valid Ruby program.)
+
+I confirmed the following implementations/platforms:
+
+* ruby 2.5.0p0 (2017-12-25 revision 61468) [x64-mingw32]
+
+### Description
+
+First, look at
+
+https://docs.ruby-lang.org/ja/latest/doc/spec=2flexical.html#reserved
+
+and then, look at entry.rb.
+
+The source code of entry.rb consists only of reserved words of Ruby,
+and all the reserved words are used in the code, in a way that the code
+forms a valid Ruby program. No compile error, no warning, or no runtime error.
+
+
+### Internals
+
+Difficult (and interesting) points of the theme are:
+
+* Since many of the reserved words define program structures, we cannot
+  use them independently. For instance, `retry` must be inside `rescue`,
+  or `break`/`next`/`redo` must be inside a looping construct.
+  Or, jump-out statements cannot occur at a position that requires a
+  value; `if return then true end` is a "void value expression" syntax error.
+* Inserting newlines for each 6 word (to match with the spec html) is also
+  an interseting challenge, since Ruby is sensitive to newlines.
+
+Tricks used in the code are:
+
+* def/alias/undef can take even reserved words as parameters.
+  That is, `def class ... end` defines a method named `class`.
+  The feature is crucial since otherwise `BEGIN` etc inevitably
+  introduces non-reserved tokens (like `{}`).
+* `defined?` can take some reserved words too (which I didn't know
+  until trying to write this program.)
+* "void value expression" can be avoided by using `or` or `and`.
+  `if begin return end then true end` is a syntax error, but
+  `if begin false or return end then true end` is not.
+
+
+### Limitation
+
+Sad to say that it's not a "perfect pangram".
+It uses 'alias' and 'undef' twice, and 'end' 4 times.
diff --git a/sample/trick2018/02-mame/authors.markdown b/sample/trick2018/02-mame/authors.markdown
new file mode 100644
index 0000000000..0e420fdf5d
--- /dev/null
+++ b/sample/trick2018/02-mame/authors.markdown
@@ -0,0 +1,3 @@
+* Yusuke Endoh
+  * mame@ruby-lang.org
+  * cctld: jp
diff --git a/sample/trick2018/02-mame/entry.rb b/sample/trick2018/02-mame/entry.rb
new file mode 100644
index 0000000000..cc4ef9cbc4
--- /dev/null
+++ b/sample/trick2018/02-mame/entry.rb
@@ -0,0 +1,15 @@
+'';eval(r=%q(->z{r="'';eval(r=\
+%q(#{r}))[%q`#{z}`]";i=-040;30.
+times{|n|(15+n%2*15-n/2).times{
+r<<r[i+=(1.-n&2)*(32-n%2*31)]}}
+i=r[524,0]=?\0;eval(r[479..-1])
+c['"']}))[%q`GFEDCBA"+"[e\"'"'t
+kE*;;\";"  TRICK2018  ";tb,;{{r
+2E0$ob[us@*0)[90,336])_#i\n}s#i
+0H}>["t]];};o[1,?\n*8];ex"-}eac
+1Hl<1[-1]*2*t=n%2];o[14-n,0)mvk
+8M$<4,?\n];15.times{|n|;o[35ie2
+!Pss.slice!(0,1)+x;sleep(0.0t;0
+'W=%q"<<95<<$s<<95;o=->n,x{n.'1
+;@[2]}|\e../,%@s="'%trick2018!8
+eval$s=%q_eval($s.gsub!(/#{%@`]
diff --git a/sample/trick2018/02-mame/remarks.markdown b/sample/trick2018/02-mame/remarks.markdown
new file mode 100644
index 0000000000..88b32c205a
--- /dev/null
+++ b/sample/trick2018/02-mame/remarks.markdown
@@ -0,0 +1,16 @@
+This program quines with animation.
+
+```
+$ ruby entry.rb
+```
+
+Of course, the output is executable.
+
+```
+$ ruby entry.rb > output
+$ ruby output
+```
+
+Note, we don't cheat.  This program uses escape sequences just for moving the cursor.  It doesn't use attribution change nor overwrite to hide any code.
+
+The program is crafted so that it works in two ways; it works as a normal program text, and, it also works when it is rearranged in a spiral order.  Some parts of the code are actually overlapped.
diff --git a/sample/trick2018/03-tompng/Gemfile b/sample/trick2018/03-tompng/Gemfile
new file mode 100644
index 0000000000..983f2f3bd4
--- /dev/null
+++ b/sample/trick2018/03-tompng/Gemfile
@@ -0,0 +1,2 @@
+ruby '2.5.0'
+gem 'chunky_png'
diff --git a/sample/trick2018/03-tompng/Gemfile.lock b/sample/trick2018/03-tompng/Gemfile.lock
new file mode 100644
index 0000000000..6f54c44066
--- /dev/null
+++ b/sample/trick2018/03-tompng/Gemfile.lock
@@ -0,0 +1,15 @@
+GEM
+  specs:
+    chunky_png (1.3.8)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  chunky_png
+
+RUBY VERSION
+   ruby 2.5.0p0
+
+BUNDLED WITH
+   1.16.1
diff --git a/sample/trick2018/03-tompng/authors.markdown b/sample/trick2018/03-tompng/authors.markdown
new file mode 100644
index 0000000000..26ebe24da6
--- /dev/null
+++ b/sample/trick2018/03-tompng/authors.markdown
@@ -0,0 +1,3 @@
+* Tomoya Ishida (tompng)
+  * tomoyapenguin@gmail.com
+  * cctld: jp
diff --git a/sample/trick2018/03-tompng/entry.rb b/sample/trick2018/03-tompng/entry.rb
new file mode 100644
index 0000000000..f6de44b6be
--- /dev/null
+++ b/sample/trick2018/03-tompng/entry.rb
@@ -0,0 +1,31 @@
+X=[];class String def-@;replace ?-+self end;def-a;X.reject!{|x|x.
+__id__==__id__};a.replace(self+?-+a) end end;at_exit{eval C=(Zlib
+.inflate Integer((X*?-).tr(?-,'').tr('q-z','0-9'),26).digits(256)
+.pack'C*')};def method_missing n;(X<<n.to_s)[-1]end;require'zlib'
+fzygtoxyzgntmdmuwvfoffbpmvzojpkhczvjvjdbtscnldwbdoprackddovivvmkz
+ponzmosvtjciwkgaslscxxxwudeesmmqpfhislxuxnnypulxstzgobyaekqqhbjcg
+mvko------------ddkeys----eivhnccaqyiw---bzyccmt-----------ymtnge
+jwhi--------------pjxf------mdarbtumnv---qasda--------------gmwdt
+wrtk---qtpzgnce----fsl-------fkgzgtbpp---gwnm----pxkpqkdiw---owga
+momz---yjjvpnvar---zeo---v-----duvalwu---nsqt---waofemwakivnyqkjd
+fzag---uhvusmkl----kzb---rhc----iutzjr---mqlh---ayijpwativpweaato
+xexs--------------rvgv---pjdz-----lkkg---uiaw---lovitupw-----fwmn
+kfru------------jvjpgv---jskycf----pal---gbuf---hfdnywog-----iuca
+pntn---apmkqroeuzwuwkw---gqnmgof-----b---hlpl---vkkyhfyrqfr--jwrl
+kmdb---dhspujhmtgrkccu---uonfummdt-------rqfw----bpiactehwp--fncq
+yzvz---gdaxebplhfndran---ytfmviryeh------hqwkl---------------nced
+bibu---fnkdthgldhkxxjg---rwnmpudhbqin----gucoyki------------hfura
+cqdgqpyzqfzknvdjoxxhpjulwwyebtocxdrvklbuviwwcatlmdosxfvwntzbijguy
+iglrvvzlxerflupxvsyujfacuwhrvmnecgtewtqkhtdggcltejiyqcluclkycwvzg
+vvxfysvttfbeglvrlngntdngzyhqrmltazwdydxrsvjploembhgxdvfmmhepbschm
+brn--iqrcdb--evv----tqp------lg--uein-wzut--mr------wkh------foqz
+zsf--srjnjp--ampb--pfio--hgtekx--rrr---fwd--jn--xqkezcz--vsb--nya
+khrc--evlr--oioxs--mqce--bqfmag--bwz---xda--qw--jnuzelr--qzi--itx
+mdxd--duso--wxbot--nmon--ugnbdpc--a--c--e--hlg--twxndre--tby--rhg
+evhbn--zb--dtxmiz--dpia------vie--h--i--t--shh------kfn------owna
+ealmt--kb--scxdjy--smvl--dqmgebk--t--s--t--gfd--updcbnc--rh--dwwp
+dvpnxb----wpljjdy--kolc--qflyleok---xkv---usbj--jhrawbn--ewx--bgf
+eaqwrw----ejwxhet--dice--eoczconm---urz---rqyp--hovvvfc--bskj--el
+aocjcts--jtumwxm----mgy------xpaoq-jtwqr-aipay------dhy--iync--hk
+sckddmvuvvuhhqstumaykvczaaujrumqbbqsdvdycplyrlkkojlxnkrhbbrmnjxyf
+cdtcmpfmjvthwkpzucbblttgumomlxnxwjeypfeagaukfzeokzxjebkpigcvlqnso
\ No newline at end of file
diff --git a/sample/trick2018/03-tompng/output.txt b/sample/trick2018/03-tompng/output.txt
new file mode 100644
index 0000000000..ed9a4079cc
--- /dev/null
+++ b/sample/trick2018/03-tompng/output.txt
@@ -0,0 +1,44 @@
+undef p;X=[];class String def-@;replace ?-+dup end;def-a;X.reject!{|x|x.__id__==__id__};a.replace(self+?-+a) end end;at_exit{eval C=
+(Zlib.inflate (X*?-).tr(?-,'').tr('q-z','0-9').to_i(26).digits(256).pack'C*')};def method_missing n;(X<<n.to_s)[-1]end;require'zlib'
+gmlztzdculbtzgtjfetuh---k--htf----d-----------------------------------------------------g-b-----s--t-g--------jmuwescmgchftikfjafccs
+ivchcveidpvxdabnvwyga-f--v-------xf----------------------------------------------------q-v---l-------q---------liiNeawriayymwooxgxqw
+rfosepqsmojseyezmwbhi--------------ew--------------------------------------------------m---k-r-----------vwu--hiotltdmczwyjmlvbyfqwq
+uvvykqdjednoqgtcmtfbzs---------f----o--------------------------------------------------t--a------m----x---f-----dldzsakyofetfozfpmrq
+geusutariiiNiulkjbwlm-----d------------------------------------------------------------j---------o---------x--j-uitzrgwpupwhvendhyno
+uubvnssiywkklwwdufhhi-rw----k---v-------------------------------------------------------sty-----yg---l---c-v----wkffpskpumolqmkeryzg
+zrxdaiposwybbzgxdnegh-----g-----ma--n---------------------------------------------------------j----n--b-n-------yqavmscswdogpcgopygt
+axiqfswlhzeamvymdnteo---q-q-w--------------------------fhrmj-----------------hkou-----------f-----d----u-o------evcuxxegekfgivzzujan
+nslioftsvqvtkeigvfgwr-------------lyco-----------------igyvg-----------------okuk---------m--b-u--d--y------s---dadjrlykfhtermzfyktu
+btoxzfpPicxxfligbivvf--------h----yrat---------------------------------------vjwd---------------------d-ki--o--tyqosehopkwttigwwfskp
+komzvnyrvkjcjwbmdwdkp----------vxphiNdtawn--xms-saketo--jnld----ezulntdaz----nzna-----vhjwt------h----x--x--o--saxxsrkgktqotaluylbkk
+sclegratyaarmgmepheml----------hwgglhlrfcx--znvmpfsgjx-onhju---gtxsmzqprlt---mjzy---frhdk-------------v---mj----dzjujmbgldfwoybgicwu
+tfhgnhlzxlwtdtkgzlaca-------------gmex------arlm--------rvmh-ajtgf-----pqal--wcux-zatyi-------------------------xnluwybcugjclmablshn
+tnjohqtqzivgmyutrssil-------------lcwq------jrf--------gcaii-maie------------vvnfjfqwo--------------------------filivosyhkxcvuwdibwj
+tyxjiopiFqypvwdzoatuq-------------tdln------cnx---------ffuf-ajvq------------tyyypglpzmj------------------------vtqzwewqdsijrbymvpwn
+niNffphoehukpvvmzvhyd-------------ahqd------nfr---------jeqk--toap-----mxhyg-tedv---otrwy-----------------------mjxnrktackwxwiajdnuc
+kkxhuwbvibpvgvcampadi-------------ebmencqz--obf--------wfprz---qmrotkijiqv---ggfp-----hlzw----------------------kastwdpxiyftmypuxbtu
+xetudmwzpomktgnjkcsyc---------------fwpdx---xb----j-----se-k------tllakc-----gjoo-------we------mic---lktk------ubtnrxvrjzuqlrfrsnmf
+okdvfvcdbdqkckjialskk---------------------------v---u-------l----------------------------------z--q--qfg--------aaliNbxbjjpxebboneye
+kcbkjmdclwnfawtfnwkeq----------------------------------j---y-------------------------------a---jmbyo-sgef--gf---extljbozuoofgyvsilct
+xzoqmsqgzjxxpjqwkjkdd------------------------o--------m-------f---------------------------------n--de-ajz-rzv---fhnpbkrwdxoozpxeaxaf
+mbcwxuiqdwcmadheiykaa-----------------------q-f------l---i---------------------------------r----zf---k--y---fi--dcnycheytylcgnioauee
+yekiNacriqoevtdjerqbp----------------------------w---yy-----my----------------------------ko--mnbpskr--c-----j--ozyqpbfovhbhyoprzgqr
+czwtuopxkdbphocfawvbk--------------------------q-s----j--b---------------------------------hd-xsb----bfiNp--w---fmwuvfambdqvxtzldwmh
+xysnyrseydlkjcwfbsjnr-------------------------d-d-------------------------------------------f-enpss---qllpwr----almsdidvjwoigvldfqoa
+lrpbixjpofxocxlflscpo------------------------------q-fyu--z-------------------------------------kfd-z---n-------bqxurujnxzurrdgcojks
+jetyfdkcekckxbyosbfws-------------wdfhgwuvejjmf-----sxjubpvgcsl-------tnmixpv---------eurabjsdvstfv-------------qcyiqhonwoyixqeonfvp
+mopPhywsozohitutgmmrb------------zxwtxe--riedeo---mspgpnv--pimlh------jhtzajk--------qqovvq---ldbrh-------------xtooxpayonpcvvtmvpra
+vvuyiunpoeagdzqjecsub------------klrw------snrc---rrct------aajom--------nsyk--------peea-------azq-------------iNjefdkfhnagjicqwmsm
+mbwwbfgehhbdmvvlflmee---------------------hkejn---jtbo-------jdtje-------jcei---------afyz-----smtc-------------kksvfjyuaqtohxiohhlz
+dvfmfrzcmnsfruhqgjuxz------------------dfxdnlk----kkra-------xmmtf-------jwkw----------rdoozxtcho---------------bbwwferxwnnmdzcniicv
+mfneisdlyeqwynldjgonj----------------jgrjvc-------uxga-------ghnpr-------sers--------scbknx----gmjo-------------moedtnlbflhtlkjibrqk
+gobwqshnpbdcpjmjaeczr--------------iscsxs---------zfpo-------hhfwy-------qbba-------vhlxc-------ntod------------ndwzdomaptumzejiwqbn
+snucynymvfpnadyqkzfcv-------------ggze------------kuvfs-----zuhod--------mylo-------jhwyp-----z-pywd------------dqfmpnevmtqcikbrilto
+aotyxkipebdkassogpcbl-----------wgackesmvvsrihhd---orzndjndlzpb----------eobf-------kkayixzyotqfafa-w-----------mjjxoomwdglwvccozzut
+rthesuszfwycsqqrtxlot-----------ejcqlhriilqbtrys------lwbkzmvp-----------zzwm-------l--qijwfllndzb-ik-----------mmokqomjepdcotnsiNig
+nloryyoswwdmefywnnuhph------------------------------------------------------r--r-nd-----h--x--------------------hlgzeqqslwxgtjgghquf
+nssngjtiudsrvfuxjzclhjhj----------------------------------------------------------t----------------k-f-mp-------obhyehqebtpjbkeepqzt
+ezogzsimfynqmkteaipejo-g-yser-----------------------------------------------e------h-------------i---y----------qpgcqnltivmmsximbbsy
+wtjjolwyoselcumgklqwpldkl-ulm-m---------------------------------------------------------------q---u-f--l--------buixfiitufktsqdtnrei
+tgrtitcewseetlpeuuujb-osdokjozc------------------------------------------n---d-----f--------g--------q--g-------jyyqtezuzmcxgpcwuwfx
+dpPayqmzxrwhbswwalygfurtkruw-u-k---------------------------------------------d---h------i----------c----i-------ulowcddvjbxthqlxjzbe
diff --git a/sample/trick2018/03-tompng/remarks.markdown b/sample/trick2018/03-tompng/remarks.markdown
new file mode 100644
index 0000000000..fe9eec5989
--- /dev/null
+++ b/sample/trick2018/03-tompng/remarks.markdown
@@ -0,0 +1,19 @@
+### Remarks
+
+Bundle install
+    this program depends on `gem chunky_png`
+
+Run it with the following command:
+    bundle exec ruby entry.rb trick.png
+    bundle exec ruby entry.rb [other png file]
+
+I confirmed the following implementations/platforms:
+
+* ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin16]
+* ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16]
+
+### Description
+
+This program is a png image viewer.
+The output is an asciiart of the given png file,
+and it is also a source code of the png viewer itself.
diff --git a/sample/trick2018/03-tompng/trick.png b/sample/trick2018/03-tompng/trick.png
new file mode 100644
index 0000000000..d4bb0bd7c3
--- /dev/null
+++ b/sample/trick2018/03-tompng/trick.png
diff --git a/sample/trick2018/04-colin/authors.markdown b/sample/trick2018/04-colin/authors.markdown
new file mode 100644
index 0000000000..a846d12535
--- /dev/null
+++ b/sample/trick2018/04-colin/authors.markdown
@@ -0,0 +1,3 @@
+* Colin Fulton
+  * justcolin@gmail.com
+  * cctld: us
diff --git a/sample/trick2018/04-colin/entry.rb b/sample/trick2018/04-colin/entry.rb
new file mode 100644
index 0000000000..442a8ea3a8
--- /dev/null
+++ b/sample/trick2018/04-colin/entry.rb
@@ -0,0 +1,2 @@
+# Copyright 2018. Available for use under the terms of the MIT License.
+$🚀=0;def 🤔 🏷,🤔=0,&b;puts ' '*$🚀+(🤔 ?"":"🚫 ")+🏷;$🚀+=4;b&.[];$🚀-=4;end
diff --git a/sample/trick2018/04-colin/remarks.markdown b/sample/trick2018/04-colin/remarks.markdown
new file mode 100644
index 0000000000..8c2dd7067b
--- /dev/null
+++ b/sample/trick2018/04-colin/remarks.markdown
@@ -0,0 +1,62 @@
+### Remarks
+
+Create a Ruby file that requires entry.rb with a series of test in it the run the file using ruby:
+
+```
+ruby name_of_test_file.rb
+```
+
+To create a test, call 🤔 with two arguments. The first is a string describing what this tests, the second argument is the test assertion. If the assertion is truthy, the test passes. If the assertion if falsy, the test fails.
+
+```
+string_1 = "Hello world!"
+string_2 = "This is not the same!"
+
+🤔 "The two strings are equal",
+  string_1 == string_2
+```
+
+To create a group of tests under a label, call 🤔 with a string describing the group and a block containing the tests in that group.
+
+```
+🤔 "This is a group of tests" do
+  # Add other groups and/or tests here.
+end
+```
+
+Here is an example:
+
+```
+require './entry'
+
+🤔 "Math" do
+  🤔 "Addition" do
+    🤔 "One plus one equals two.",
+      1+1 == 2
+    🤔 "One plus one equals eleven. (This should fail.)",
+      1+1 == 11
+  end
+
+  🤔 "Subtraction" do
+    🤔 "One minus one equals zero.",
+      1-1 == 0
+    🤔 "Ten minus one equal nine.",
+      10-1 == 9
+  end
+end
+```
+
+It has been tested with the following Ruby versions:
+
+* ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
+* ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
+* If you replace `b&.[]` with `b&&b[]` it will work with ruby 2.0.0 as well, but it will be one character longer.
+
+
+### Description
+
+The goal was to create a testing library where the test files looked good and the output looked good in as few characters as possible. The result is 68 characters and has one method to handle everything.
+
+### Limitation
+
+Your terminal program must support Unicode characters for the test output to look correct. If your terminal does not support Unicode, simply replace the 🚫 in the code with whatever character you want to prefix failing tests.
diff --git a/sample/trick2018/05-tompng/authors.markdown b/sample/trick2018/05-tompng/authors.markdown
new file mode 100644
index 0000000000..26ebe24da6
--- /dev/null
+++ b/sample/trick2018/05-tompng/authors.markdown
@@ -0,0 +1,3 @@
+* Tomoya Ishida (tompng)
+  * tomoyapenguin@gmail.com
+  * cctld: jp
diff --git a/sample/trick2018/05-tompng/entry.rb b/sample/trick2018/05-tompng/entry.rb
new file mode 100644
index 0000000000..31522b6de2
--- /dev/null
+++ b/sample/trick2018/05-tompng/entry.rb
@@ -0,0 +1,41 @@
+                                                    X=[];def self.method_missing n;n.to_s.chars;end
+                                               l=[];def l.-a;X<<a=[nil,*a];a;end;def l.+a;self-a;end
+                                           class Array;def-@;[]-self;end;def-a;replace [*self,nil,*a
+                                 ]end;alias +@ -@;alias + -;end;def gen3d f;yield;b=['solid obj'];w,
+                 h=X[0].size,X.size;X<<[];a=->r,z,dr,dz{;r-=w/2.0;z*=2;r2,z2=r+dr,z+dz*2;if r>0||r2>
+                 0;r=[0,r].max;r2=[0,r2].max;16.times{|i|m=Math;p=m::PI/8;;c,s=m.cos(t=i*p),m.sin(t)
+                 c2,s2=m.cos(t=(i+1)*p),m.sin(t);t-=p/2;[[0,1,2],[0,2,3]].map{|a|b.push [:facet,'n'+
+               +                 'ormal',dz*m.cos(t),dz*m.sin(t),-dr]*' ','outer loop',a.map{|i|'v'+
+              ++                           "ertex #{[[r*c,r*s,z],[r*c2,r*s2,z],[r2*c2,r2*s2,z2],[r2*
+              +c,                              r2*s,z2]][i]*' '}"},:endloop,:endfacet}}end};(0...h).
+             map{|                                  y|w.times{|x|[X[y-1][x]||a[x,y,1,0],X[y+1][x]||
+           a[x+1,y+
+          1,-1,0],X[
+         y][x-+1]||a[
+        x,y+1,0,-1],X[y
+       ][x++1]||a[x+1,y,
+       0,1]]if X[y][x]}}
+       s=[b,'end'+b[0]]*
+        $/;File.write(f,
+         s);X.replace(
+            []);end
+
+gen3d 'wine_glass.stl' do
+  l--ww------------------ww--l
+  l--ww------------------ww--l
+  l--ww++++++++++++++++++ww--l
+  l--ww++++++++++++++++++ww--l
+  l--ww++++++++++++++++++ww--l
+  l--ww++++++++++++++++++ww--l
+  l---ww++++++++++++++++ww---l
+  l----www++++++++++++www----l
+  l------www++++++++www------l
+  l--------wwwwwwwwww--------l
+  l-----------wwww-----------l
+  l------------ww------------l
+  l------------ww------------l
+  l------------ww------------l
+  l-----------wwww-----------l
+  l---------wwwwwwww---------l
+  l----wwwwwwwwwwwwwwwwww----l
+end
diff --git a/sample/trick2018/05-tompng/preview_of_output.png b/sample/trick2018/05-tompng/preview_of_output.png
new file mode 100644
index 0000000000..db511ee2f3
--- /dev/null
+++ b/sample/trick2018/05-tompng/preview_of_output.png
diff --git a/sample/trick2018/05-tompng/remarks.markdown b/sample/trick2018/05-tompng/remarks.markdown
new file mode 100644
index 0000000000..17be56b61f
--- /dev/null
+++ b/sample/trick2018/05-tompng/remarks.markdown
@@ -0,0 +1,31 @@
+### Remarks
+
+Just run it with no argument:
+
+    ruby entry.rb
+
+I confirmed the following implementations/platforms:
+
+* ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin16]
+* ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16]
+* ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin16]
+
+### Description
+
+This program will generate `wine_glass.stl`, a 3D data file(STL format) of a wine glass.
+You can change the shape by modifying the DSL part.
+For sake cup:
+```ruby
+gen3d 'ochoko.stl' do
+  l------------------------l
+  l-ww------------------ww-l
+  l-ww------------------ww-l
+  l-ww++++++++++++++++++ww-l
+  l-ww++++++++++++++++++ww-l
+  l--ww++++++++++++++++ww--l
+  l---wwww++++++++++wwww---l
+  l----wwwwwwwwwwwwwwww----l
+  l----www----------www----l
+end
+```
+`+` and `-` are the same meaning(just for apperance)
diff --git a/sample/trick2018/README.md b/sample/trick2018/README.md
new file mode 100644
index 0000000000..8e5729f151
--- /dev/null
+++ b/sample/trick2018/README.md
@@ -0,0 +1,16 @@
+This directory contains the award-winning entries of
+the 3rd Transcendental Ruby Imbroglio Contest for rubyKaigi (TRICK 2018).
+
+THESE ARE BAD EXAMPLES!  You must NOT use them as a sample code.
+
+* 01-kinaba/entry.rb: "Most reserved" - **Gold award**
+* 02-mame/entry.rb: "Best spiral" - **Silver award**
+* 03-tompng/entry.rb: "Best png viewer" - **Bronze award**
+* 04-colin/entry.rb: "Best one-liner" - 4th prize
+* 05-tompng/entry.rb: "Most three-dimentional" - 5th prize
+
+These files are licensed under MIT license.
+
+For the contest outline and other winning entries, see:
+
+https://github.com/tric/trick2018