Refactoring Rails With sed -- Class Method Renaming
Monday, March 28, 2011 at 06:12PM Something that you'll ocassionally hear from new Rails developers (especially if they are coming from an IDE-centric world) is that they miss having refactoring tools. Well, it's never going to be as easy to automate refactoring in a dynamic language as it is in a static language. All of that compile time info in static languages is very useful for refactoring and in Ruby we just don't have that to work from. That said, as terminal dwellers there is a lot of power that we can gain from leveraging UNIX tools. Here is one way in which I have learned to take advantage of BASH and sed, to rename a class method in a rails app. Here I am renaming a class method called 'omc_data_service' to 'service'. I'm all about pulling this stuff off as one liners right in the terminal. It seems a bit crazy at first, but after you do it a few times you can come up with something like this in about 20 seconds.
It's pretty straight forward really
This is just saying "Loop over all the Ruby files starting from the current dir and recursing"
Print the file name
This is the real logic. Sed is a line based editor that we are using here to make a regex substitution.
The "-i" flag means "Do the subsititution inline, rather than to stdout".
The "-e" flag means "the following string is a sed expression".
The first regex "/[:.]omc_data_service/" is saying "Only apply this to lines that contain the method name". This is only needed because we don't want sed to rewrite lines when there is no change made. Without the first regex the result would be the same, except every file would have it's 'last modified' date changed.
Anyway, we are looking for either a starting '.' for calling and declaring the class method, or a starting ':' for when we are passing the method name as a symbol to Flexmock. The '\([:.]\)' means, "Remember if it started with a '.' or ':'". The "\1" says "Since you rememebered if it had a '.' or ':', put that here". Finally the "/g" takes care of all occurances on a line rather than just the first.
Hope this was helpful.
Reader Comments (11)
You don't need for, echo, do/while:
find . -name \*.rb -print -exec sed -i -e "/[:.]omc_data_service/ s/\([:.]\)omc_data_service/\1service/g" \{} \;..and you don't need to repeat the regexp:
find . -name \*.rb -print -exec sed -i "/[:.]omc_data_service/ s//\1service/g" \{} \;alt:
find . -name \*.rb -print -exec sed -i "s/[:.]omc_data_service/\1service/g" \{} \;May I suggest piping into xargs instead of the for loop?
find . -name \*.rb -print0 | xargs -0 sed --i -e "/[:.]omc_data_service/ s/\([:.]\)omc_data_service/\1service/g"..but make sure you capture [:.], i.e use the alternative version:
find . -name \*.rb -print -exec sed -i "s/\([:.]\)omc_data_service/\1service/g" \{} \;Sorry, about that.
If you fancy command line, chances are vim is your editor of choice. In which case you might find EasyGrep useful. It does all that and more.
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