Intermediate Perl notes
Flask documentation 学习笔记
Dancer::Introduction 学习记录
这不是自己第一次学习dancer这个Perl Web 框架了， 也不是第一次学 Dancer::Introduction 这个教程了。但是因为学习了太长时间， 忘得差不多了， 所以现在记录下， 以备查询。
1. The route action is the code reference declared. It can access parameters through the `params' keyword, which returns a hashref. This hashref is a merge of the route pattern matches and the request params.
2. A route pattern can contain one or more tokens (a word prefixed with ':'). Tokens can be optional, for example:
get '/hello/:name?' => sub {
"Hello there " . (param('name') || "whoever you are!");
};
3. A route can contain a wildcard (represented by a '*'). Each wildcard match will be returned in an arrayref, accessible via the `splat' keyword.
get '/download/*.*' => sub {
my ($file, $ext) = splat;
return "file is ".$file." and ext is ".$ext;
};
4. In order to tell Dancer to consider the route as a real regexp, the route must be defined explicitly with qr{}, like the following:get qr{/regular/([\w]+)} => sub {
my ($name) = splat; return "Hello $name"; };
5. Before hooks are evaluated before each request within the context of the request and can modify the request and response. It's possible to define variables which will be accessible in the action blocks with the keyword 'var'.
6. after hooks are evaluated after the response has been built by a route handler, and can alter the response itself, just before it's sent to the client.
7. before_template_render hooks are called whenever a template is going to be processed, they are passed the tokens hash which they can alter.
8. You can use the load method to include additional routes into your application. load is just a wrapper for require, but you can also specify a list of routes files.
9. Dancer configures the Template::Toolkit engine to use <% %> brackets instead of its default [% %] brackets.
10. In order to render a view, just call the 'template' keyword at the end of the action by giving the view name and the HASHREF of tokens to interpolate in the view (note that the request, session and route params are automatically accessible in the view, named request, session and params):
use Dancer;
use Template;
get '/hello/:name' => sub {
template 'hello' => { number => 42 };
};
11. A layout is a special view, located in the 'layouts' directory (inside the views directory) which must have a token named `content'. That token marks the place where to render the action view. This lets you define a global layout for your actions. Any tokens that you defined when you called the 'template' keyword are available in the layouts, as well as the standard session, request, and params tokens. This allows you to insert per-page content into the HTML boilerplate, such as page titles, current-page tags for navigation, etc.
12. When setting up a serializer, a new behaviour is authorized for any route handler you define: any response that is a reference will be rendered as a serialized string, via the current serializer.
关于这篇教程就写这么多了。
启动emacs时框口最大化
在emacs的配置文件中加入以下的代码， 可以让emacs在打开的时候最大化：
(custom-set-variables '(initial-frame-alist (quote ((fullscreen . maximized)))))
Practical VIM学习笔记
接触VIM的日子已经颇长了， 自己现在的VIM的配置已经是非常的强大了，可惜是clone别人的。 只是在一些配置上稍稍做了些改动, 然后添加了一些自己喜欢的package。使用VIM的技艺还是得经常磨练的， 要不然很快就会手生还有遗忘的。 这片文章记录自己再学习<<Practical VIM>>这本书的时候做的一些笔记， 这些都是自己估计会在coding的时候经常遇到的， 记录下来可以经常查阅。
Read the Forgotten Manual
1. The Normal mode cw command deletes to the end of the current word and switches to Insert mode.
2. 如果有这么一段：
<a href="http://pragprog.com/dnvim/">Practical Vim</a>
再normal模式下， 按下vit会选择Practical Vim
Chapter 1--The Vim Way
1. The dot command lets us repeat the last change.
2. Press A in normal mode will put the cursor at the end of a file and go into insert mode.
3. The s command compounds two steps into one: it deletes the character under the cursor and then enters Insert mode.
4. The f{char} command tells Vim to look ahead for the next occurrence of the specified character and then move the cursor directly to it if a match is found.
5. By pressing the , key, it will repeat the last f{char} search in the reverse direction
6. The * command will executes a search for the word under the cursor at that moment.
Chapter 2--Normal Mode
1. Pressing db deletes from the cursor’s starting position to the beginning of the word.
2. Pressing b will go to the beginning of a word backwordly, while w will do it forwardly.
3. The daw command is easily remembered by the mnemonic delete a word.
4. The <C-a> and <C-x> commands perform addition and subtraction on numbers.
5. yyp will copy the current line and paste it to the next line.
6. c3w will change 3 words after the cursor.
7. The d{motion} command can operate on a single character ( dl), a complete word ( daw), or an entire paragraph ( dap). Its reach is defined by the motion. The same goes for c{motion}, y{motion}, and a handful of others. Collectively, these commands are called operators. You can find the complete list by looking up :h operator
8. > will shilt right, = will do auto-indent;
9. \\\ will comment the current line. (I tested \\ will be enough.)
10. If we wanted to autoindent the entire file using the = command, we could run gg=G (that is, gg to jump to the top of the file and then =G to autoindent everything from the cursor position to the end of the file).
Chapter 3--Insert Mode
1. In insert mode, <C-h> Delete back one character (backspace), <C-w> Delete back one word, <C-u> Delete back to start of line.
2. In normal node, yt{char} will copy till the char(not including).
3. From Normal mode, we can engage Replace mode with the R command.
Chapter 4--Visual Mode
1. <C-v> Enable block-wise Visual mode, gv Reselect the last visual selection, o Go to other end of highlighted text.
2. gU{motion} will make {motion} text uppercase. (In visual mode).
3. In normal mode, vit, which can be read as: visually select inside the tag.
4. e in normal mode will forward to the end of word (inclusively).
For more about how to use visual mode to append and substitute text, please refer to the book.
Chapter 5--Command-Line Mode
基本上跳过了这一章， 只学会：
1. ：%s///g;来进行替换。
2. Note the difference between :!ls and :ls—the former calls the ls command in the shell, whereas :ls calls Vim’s built-in command, which shows the contents of the buffer list.
3. On Vim’s command line, the % symbol is shorthand for the current file name. So :!ruby % will run the current file.
Chapter 6--Manage Multiple Files
1. In vim, we’re editing an in-memory representation of a file, which is called a buffer in Vim’s terminology. Files are stored on the disk, whereas buffers exist in memory. When we open a file in Vim, its contents are read into a buffer, which takes the same name as the file. Initially, the contents of the buffer will be identical to those of the file, but the two will diverge as we make changes to the buffer. If we decide that we want to keep our changes, we can write the contents of the buffer back into the file.
2. We can divide this window horizontally with the <C-w>s command, which creates two windows of equal height. Or we can use the <C-w>v command to split the window vertically, producing two windows of equal width.
3. <C-w>c Close the active window, <C-w>o Keep only the active window, closing all others.
4. <C-w>= Equalize width and height of all windows, <C-w>_ Maximize height of the active window.
5. Alternatively, if the current tab page contains more than one window, we can use the <C-w>T command, which moves the current window into a new tab page (see :h CTRL-W_T ).
6. :tabc[lose] Close the current tab page and all of its windows, :tabo[nly] Keep the active tab page, closing all others.
7. :tabn[ext], also gt Switch to the next tab page, :tabp[revious], also gT Switch to the previous tab page.
Chapter 7--Open Files and Save Them to Disk
Just skipped over this chapter.
Chapter 8--Navigate Inside Files with Motions
1. ge Backward to end of previous word.
2. Taken together, the ea commands can be read as “Append at the end of the current word” . The gea command can be read as “append at the end of the previous word”.
3. Vim keeps track of the most recent f{char} search, and we can repeat it using the ; command.
4. The , command repeats the last f{char} search but in the opposite direction.
5. t{char} Forward to the character before the next occurrence of {char}, T{char} Backward to the character after the previous occurrence of {char}.
6. dt. will delete till .
7. We can read the ci" command as “change inside the double quotes.” The cit command can be read as “change inside the tag.” We could just as easily use the yit command to yank the text from inside the tag, or dit to delete it.
8. Keystrokes Buffer Contents
iw Current word aw Current word plus one space iW Current WORD aW Current WORD plus one space is Current sentence as Current sentence plus one space ip Current paragraph ap Current paragraph plus one blank line
Chapter 9--Navigate Between Files with Jumps
1. gf command means go to file (:h gf ).
Chapter 10--Copy and Paste
1. The p command pastes the contents of the unnamed register after the cursor position.
2. Taken together, the xp commands can be considered as “Transpose the next two characters.”
3. The ddp sequence could be considered to stand for “Transpose the order of this line and its successor.”
4. Rather than using a single clipboard for all cut, copy, and paste operations, Vim provides multiple registers. When we use the delete, yank, and put commands, we can specify which register we want to interact with.
5. We can specify which register we want to use by prefixing the command with "{register}. If we don’t specify a register, then Vim will use the unnamedregister.
6. For example, if we wanted to yank the current word into register a, we could run "ayiw. Or if we wanted to cut the current line into register b, we could run "bdd. Then we could paste the word from register a by typing "ap, or we could paste the line from register b by typing "bp.
Chapter 11--Macros
1. Macros allow us to record a sequence of changes and then play them back.
2. The q key functions both as the “record” button and the “stop” button. To begin recording our keystrokes, we type q{register}, giving the address of the register where we want to save the macro. We can tell that we’ve done it right if the word “recording” appears in the status line. Every command that we execute will be captured, right up until we press q again to stop recording.
3. The @{register} command executes the contents of the specified register (see :h @ ). We can also use @@, which repeats the macro that was invoked most recently.
(I have to say I did not finish this chapter!)
Chapter 12--Matching Patterns and Literals
1. We can override Vim’s default case sensitivity using the \c and \C items. Lowercase \c causes the search pattern to ignore case, while the uppercase \C item forces case sensitivity. If either of these items is used in a search pattern, the value of ‘ignorecase’ is overridden for that search.
2. For using regex in vim, The \v switch at the start causes all subsequent characters to take on a special meaning.
Miscelleneous
1. Tag navigation and tag autocompletion won’t work unless Vim knows where to look for an up-to-date index file.
2. Command Type of Completion
<C-n> Generic keywords <C-x><C-n> Current buffer keywords <C-x><C-i> Included file keywords <C-x><C-]> tags file keywords <C-x><C-k> Dictionary lookup <C-x><C-l> Whole line completion <C-x><C-f> Filename completion <C-x><C-o> Omni-completion
怎样把 Github上 的 Octopress Clone 到本地以及发布博客
力求精简， 步骤如下：
1. git clone -b source https://github.com/shpeacelover/shpeacelover.github.com octopress 2. cd octopress 3. git clone https://github.com/shpeacelover/shpeacelover.github.com _deploy 4. sudo gem install bundler 5. bundle install 6. rake new_post[“The Title of Your Article”] 7. bundle exec rake generate 8. bundle exec rake preview 9. bundle exec rake deploy 10. git add . 11. git commit -m ‘your comment’ 12. git push origin source
Oh My Love Lyrics
John Lennon的“Oh my love”。 非常喜欢这首歌。这首歌陪伴着我度过了我“自认为”的美好的时光。多么讽刺啊！原来感觉还是可以骗人的。
Oh my love for the first time in my life, my eyes are wide open.
Oh my love for the first time in my life, my eyes can see.
I see the wind, I see the trees, everything is clear in my heart.
I see the clouds, I see the sky, everything is clear in our world.
Oh my lover for the first time in my life, my mind is wide open.
Oh my lover for the first time in my life, my mind can feel.
I feel sorrow, I feel dreams, everything is clear in my heart.
I feel life, I feel love, everything is clear in our world.
brew update 错误处理
自己在运行“brew update”的时候， 已经不止一次遇到这样的错误信息了：
cd `brew --prefix` git remote add origin https://github.com/mxcl/homebrew.git git fetch origin git reset --hard origin/master
最后一步有的时候得加上”sudo“来运行。
开通博客第一天
is-programmer.com 这个博客系统是很早就知道了， 但是一直以来都没有用过。 博客系统用过新浪的， 网易的， octopress的。现在还在更新的就只有octopress的了， 地址是http://shpeacelover.github.io。现在决定以后将使用这个博客来记录自己的生活， 工作， 学习的方方面面。