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parameter, file, text = ARGV if parameter == '-w' #=> write mode File.open(file, 'w'){ text } if parameter == '-r' #=> read mode File.readlines(file).each{ text } end
Examples
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Example 1: $ ./file.rb -w /home/usr/hello.rb "puts 'hello, world'" $ ./file.rb -r /home/usr/hello.rb puts 'hello, world' Example 2: $ ./file.rb -w /home/usr/hello.rb "puts "hello, world"" $ ./file.rb -r /home/usr/hello.rb puts hello Example 3: $ ./file.rb -w /home/usr/hello.rb "puts 'hello, world!'" bash: !: event not found Example 4: $ ./file.rb -w /home/usr/hello.rb "puts 'hello, world\!'" $ ./file.rb -r /home/usr/hello.rb puts 'hello, world\!'
Refactorings
No refactoring yet !
Fu86
June 21, 2010, June 21, 2010 00:35, permalink
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The Problem with parameters is that your shell handles the parameter substitution. If you write ... *.mp3, your shell will substitute this to a list of filenames ending with .mp3. This behavior differs in some shells. The last example (4) with the ! works great (without the \) on my zsh shell.
You can work with pipes to avoid this problems.
Catch all parameters
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all_params = $*
Use Pipes
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puts gets unless STDIN.eof?
Example
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echo "puts 'Hello World'" | ./file.rb cat data.txt | ./file.rb
This is my first attempt of file I/O in Ruby(1.8.6). As you can tell from the block comments, it is limited and error-prone. I am aware of exception handling, however I can't seem to implement it correctly when using keywords like `raise'. Any help on re-factoring and even extending functionality would be very much appreciated.