Format Scala method arguments
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README.md

scala_format

Format Scala method arguments

Installation

The Format autoload 'format.vim' code file should be in the 'autoload/scala' directory, the 'format.txt' in the 'doc/scala' directory and the plugin 'format.vim' code in the 'plugin/scala' directory.

Usage

Place the cursor on any character in the method name or on the methods left paren, '(', and then invoke this script. If you use the binding above, you would enter f.

The script finds the first non-white-space character after the method's left paren and uses that as the character position for aligning all arguments.

Examples of method calls:

m1(thisIsArgOne, thisIsArgTwo, thisIsArgThree(), thisIsArgFour): Sometype = {
....
}

becomes

m1(thisIsArgOne, 
   thisIsArgTwo, 
   thisIsArgThree(), 
   thisIsArgFour): Sometype = {
  ....
}

and the following (note first argument position):

aVeryLongMethodNameAsAnExampleUsage(
                        thisIsArgOne, thisIsArgTwo, thisIsArgThree, thisIsArgFour): Sometype = {
  ....
}

becomes

aVeryLongMethodNameAsAnExampleUsage(
                        thisIsArgOne, 
                        thisIsArgTwo, 
                        thisIsArgThree, 
                        thisIsArgFour): Sometype = {
  ....
}

becomes (with g:scala_format_extra_arg_offset = 2)

aVeryLongMethodNameAsAnExampleUsage(
                        thisIsArgOne, 
                          thisIsArgTwo, 
                          thisIsArgThree, 
                          thisIsArgFour): Sometype = {
  ....
}

Generally, in this case you can change the location of the first method argument and reformat and it works (the rest of the arguments are aligned under the first argument).

Examples of method calls with string arguments:

m1(thisIsArgOne, "this is" + somestring + "a \"foo()\" test", thisIsArgThree): Sometype = {
  ....
}

becomes (with let g:scala_format_extra_string_arg_offset = 0)

m1(thisIsArgOne, 
   "this is" + 
   somestring + 
   "a \"foo()\" test", 
   thisIsArgThree): Sometype = {
  ....
}

or becomes (with let g:scala_format_extra_string_arg_offset = 2)

m1(thisIsArgOne, 
   "this is" + 
     somestring + 
     "a \"foo()\" test", 
   thisIsArgThree): Sometype = {
  ....
}

Yea, it can actually do this.

One more example of a method where an argument is itself a method call:

m1(thisIsArgOne, thisIsArgTwo(innerOne, innerTwo), thisIsArgThree()): Sometype = {
  ....
}

placing cursor on "m1(" and invoking this script becomes

m1(thisIsArgOne, 
   thisIsArgTwo(innerOne, innerTwo), 
   thisIsArgThree()): Sometype = {
  ....
}

then placing cursor on "thisIsArgTwo(" and invoking this script becomes >

m1(thisIsArgOne, 
   thisIsArgTwo(innerOne, 
                innerTwo), 
   thisIsArgThree()): Sometype = {
  ....
}

Examples of method definitions:

def m1(thisIsArgOne: String, thisIsArgTwo: Int, thisIsArgThree: Float): Sometype = {
  ....
}

becomes

def m1(thisIsArgOne: String, 
       thisIsArgTwo: Int, 
       thisIsArgThree: Float): Sometype = {
  ....
}

and the following (note first argument position):

def aVeryLongMethodNameAsAnExampleUsage(
                        thisIsArgOne: String, thisIsArgTwo: Int, thisIsArgThree: Float): Sometype = {
  ....
}

becomes

def aVeryLongMethodNameAsAnExampleUsage(
                        thisIsArgOne: String, 
                        thisIsArgTwo: Int, 
                        thisIsArgThree: Float): Sometype = {
  ....
}

Array definition: As an unplanned extra, this can be used to format the arguments to an array:

val a = Array[Int] ( 1, 3, 4, 5, 4)

becomes

val a = Array[Int] ( 1, 
                     3, 
                     4, 
                     5, 
                     4)

and

val a = Array[Int] ( 
          1, 3, 4, 5, 4)

becomes

val a = Array[Int] ( 
          1, 
          3, 
          4, 
          5, 
          4)

Ok, so formating an array does not do too much.

Vim

Vim location

Acknowledgements and thanks

  • Andy Wokula: provided feedback on help file syntax.