kk Blog —— 通用基础

puts caller

require 'find'
total_size = 0
Find.find(ENV["HOME"]) do |path|
  if FileTest.directory?(path)
    if File.basename(path)[0] == ?.
      Find.prune       # Don't look any further into this directory.
    else
      next
    end
  else
    total_size += FileTest.size(path)
  end
end

p Time.parse(“2002-03-17”)       #=> Sun Mar 17 00:00:00 +0800[v2] 2002
p Time.now        # =>Mon Oct 20 06:02:10 JST 2003
p Time.now.to_a      # => [10, 2, 6, 20, 10, 2003, 1, 293,false, "JST"]
p Time.now.to_f      # => 1418540681.0154862

Hello { {name} }
Hello { {user.name} }
Hello { { 'tobi' } }

Hello { { 'tobi' | upcase } }
Hello tobi has { { 'tobi' | size } } letters!
Hello { { 'now' | date: "%Y %h" } }

date - 格式化时间
capitalize - 输出字符串，字符串（句子）首字母大写 e.g. 假设tb为"hello world"{ { tb|capitalize } } #=> 'Hello world'
downcase - 转换小写
upcase - 转换大写
first - 获取数组的第一个元素
last - 获取数组的最后一个元素
join - 用指定的字符拼接数组元素
sort - 排序数组
map - map/collect an array on a given property
size - 返回数组大小
escape - 转移字符串
escape_once - returns an escaped version of html without affecting existing escaped entities
strip_html - 除去字符串中的html标签?
strip_newlines - 除去字符串中的回车?
newline_to_br - 将所有的回车"\n" 转换成"<br />"?
replace - 替换所有匹配内容 e.g.{ { 'forfor' | replace:'for', 'bar' } } #=> 'barbar'
replace_first - 替换第一个匹配内容 e.g.{ { 'forfor' | replace_first:'for', 'bar' } } #=> 'barfor'
remove - 移除所有匹配内容 e.g.{ { 'forbarforbar' | remove:'for'} } #=> 'barbar'
remove_first - 移除第一个匹配内容 e.g.{ { 'forbarforbar' | remove_first:'for'} } #=> 'barforbar'
truncate - truncate a string down to x characters
truncatewords - truncate a string down to x words
prepend - 在字符串前面加上内容 e.g.{ {'bar'|prepend:'far'} } #=> 'farbar'
append - 字符串后面加上内容 e.g.{ {'bar'|append: 'foo'} }#=> 'barfoo'
minus - 减法 e.g. { {4|minus:2} } #=>2
plus - 加法 e.g. { { 4|plus:2} } #=> 6
times - 乘法 e.g. { {10|times:2} } #=> 20
divided_by - 除法 e.g. { { 10 | divided_by:2} } #=> 5
split - 分割字符串 e.g.{ { "a~b" | split:'~'} } #=> ['a','b']
modulo - 取余 e.g. { { 3 | modulo:2 } } #=> 1

assign - 定义变量 e.g. { % assign tt = 1 % } 定义了变量tt数值为1
capture - Block tag为变量赋值 e.g.{ % capture dont % }{ { tt } }{ % endcapture % } 将tt的值赋给 dont
case - Block tag its the standard case...when block
comment - Block tag 注释
cycle - Cycle is usually used within a loop to alternate between values, like colors or DOM classes.
for - for循环block
if - 判断block
include - 引入模板
raw - 转义内容tag e.g.{ % raw % }{ { this } }{ % endraw% } #=> '{ { this } }'
unless - Mirror of if statement

We made 1 million dollars { % comment % } in losses { % endcomment % } this year
Raw

{ % raw % }
  In Handlebars, { { this } } will be HTML-escaped, but { { { that } } } will not.
{ % endraw % }

{ % if user % }
  Hello { { user.name } }
{ % endif % }

# Same as above
{ % if user != null % }
  Hello { { user.name } }
{ % endif % }

{ % if user.name != 'tobi' % }
  Hello non-tobi
{ % endif % }

# Same as above
{ % unless user.name == 'tobi' % }
  Hello non-tobi
{ % endunless % }

{ % if user.payments.size > 0  % }
   you paid !
{ % endif % }

{ % case condition % }
{ % when 1 % }
hit 1
{ % when 2 or 3 % }
hit 2 or 3
{ % else % }
... else ...
{ % endcase % }

{ % case template % }

{ % when 'label' % }
	 // { { label.title } }
{ % when 'product' % }
	 // { { product.vendor | link_to_vendor } } / { { product.title } }
{ % else % }
	 // { {page_title} }
{ % endcase % }

{ % cycle 'one', 'two', 'three' % }
{ % cycle 'one', 'two', 'three' % }
{ % cycle 'one', 'two', 'three' % }
{ % cycle 'one', 'two', 'three' % }

one
two
three
one

{ % cycle 'group 1': 'one', 'two', 'three' % }
{ % cycle 'group 1': 'one', 'two', 'three' % }
{ % cycle 'group 2': 'one', 'two', 'three' % }
{ % cycle 'group 2': 'one', 'two', 'three' % }

one
two
one
two

{ % for item in array % }
  { { item } }
{ % endfor % }

{ % for item in hash % }
  { { item[0] } }: { { item[1] } }
{ % endfor % }

forloop.length      # => length of the entire for loop
forloop.index       # => index of the current iteration
forloop.index0      # => index of the current iteration (zero based)
forloop.rindex      # => how many items are still left?
forloop.rindex0     # => how many items are still left? (zero based)
forloop.first       # => is this the first iteration?
forloop.last        # => is this the last iteration?

# array = [1,2,3,4,5,6]
{ % for item in array limit:2 offset:2 % }
  { { item } }
{ % endfor % }
# results in 3,4

{ % for item in collection reversed % } 
{ {item} } 
{ % endfor % }

# if item.quantity is 4...
{ % for i in (1..item.quantity) % }
  { { i } }
{ % endfor % }
# results in 1,2,3,4

{ % assign name = 'freestyle' % }

{ % for t in collections.tags % }{ % if t == name % }
  <p>Freestyle!</p>
{ % endif % }{ % endfor % }

{ % assign freestyle = false % }

{ % for t in collections.tags % }{ % if t == 'freestyle' % }
  { % assign freestyle = true % }
{ % endif % }{ % endfor % }

{ % if freestyle % }
  <p>Freestyle!</p>
{ % endif % }

{ % capture attribute_name % }{ { item.title | handleize } }-{ { i } }-color{ % endcapture % }

  <label for="{ { attribute_name } }">Color:</label>
  <select name="attributes[{ { attribute_name } }]" id="{ { attribute_name } }">
	<option value="red">Red</option>
	<option value="green">Green</option>
	<option value="blue">Blue</option>
  </select>