leav3z

[leav3z]

./configure script can generate Makefile. It aims to adapt the Makefile to all kinds of different user environments, and provide the ability to custom build configuration. Itself is a plain shell script without any other dependency.

Makefile is a simple build system, handling the dependency, and caching, of each TARGET. The target is a abstracted, generic item.

[leav3z]

So concludingly, for a developer, a configure.ac and makefile.am is need edited manually. For a user building the project, automake -> autoconf -> configure -> make

[leav3z]

The execution of Configure script actually needs other auxiliary files. The autoconf branch only define how to check the environment. There's another branch define the real build configurations. A file called Makefile.am is composed manually, defining the the binary target, the source files, link flags and others. Automake tool will utilize the Makefile.am generate a Makefile.in file and others, which will be used by the Configure script to generate the real makefile

[leav3z]

Configure script is generated by Autoconf and a source autoconf.ac. The autoconf.ac configuring how to check the environment. autoconf.ac is usually started by run autoscan to generate a base template by scanning all the source files.

A helper tool call aclocal is needed when do the process. Autoconf is basiclly a marco expending program. But autoconf tool doesn't know all the marcos, some custom macro can be interpreted to a aclocal.m4 file by acloacl, as the macro library for autoconf.

[leav3z]

./configure script can generate Makefile. It aims to adapt the Makefile to all kinds of different user environments, and provide the ability to custom build configuration. Itself is a plain shell script without any other dependency.

[leav3z]

Makefile is a simple build system, handling the dependency, and caching, of each TARGET. The target is a abstracted, generic item.

[leav3z]

step # step into

next # next line

and continue # go on running

Ruby: debug with pry

gem “pry-nav”

require “pry”

binding.pry # break at where this line positioned

[leav3z]

Ruby: debug with pry

gem "pry-nav"

require "pry"

binding.pry # break at where this line positioned

[leav3z]

class A

    class << self  

    end

end

[leav3z]

Ruby: patch a method with `yield`

class C    def m1(a)        yield(a)    end    alias_method :old, :m1    def m1(*args, &block)        p "[before]"        old(*args, &block)        p "[after]"    end end C.new.m1("hello") do |input|    p "input is " + input end

[leav3z]

Ruby: get temp path

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Menlo; color: #ffffff; background-color: #1f1f24} p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Menlo; color: #6c7986; background-color: #1f1f24} span.s1 {color: #fc5fa3} span.s2 {color: #ffffff}

require ‘tmpdir’

Dir.tmpdir # get system temp directory

Dir.mktmpdir # create a temp dir

Dir.mktmpdir{ |path| }

[leav3z]

hello world