January 19, 2012
emacs tip: getting lines numbered
filed mid-morning by dirk husemann in: hacking
technorati tags: • • • •
geo tag: N 47° 18' 31", E 8° 32' 39"
QR code for this entry · average time to read 0:36 minutes

the other day i was coding a scala apply(array: Array[String}) method to instantiate an object from a CSV file. i ended up with something like this:

            apply(uuid                        = uuid,
                  source                      = source,
                  hostname                    = rewired(0),
                  type                        = rewired(0),
                  state                       = rewired(0),
                  category                    = rewired(0),
                  id                          = rewired(0),
                  lifecycle                   = rewired(0),
                  classification              = rewired(0),
                  ...
                  flag                        = rewired(0))

there were about a 100 parameters to use. i wasn’t really too excited about having to change the rewired(0) to use the proper index by hand. so, here’s what i did:

  • in emacs mark the region
  • then invoke shell-command-on-region and
  • use perl -pi -e 's{rewired\(0\)}{sprintf("rewired(%d)", $. - 1)}e;' as command to invoke

emacs will then show you the result of the command in a temporary buffer, you can either copy and paste from there, or just repeat the shell-command-on-region and prefix it with ctrl-u — emacs with then replace the region with the output of the command directly.

voila!

comments (2)
all content posted on these pages is an expression of my own mind. my employer is welcome to share these opinions but then again he might not want to.