Add --per-file option

[r-plus]

hi @giginet

I want to add --per-file option to sum time per file. It is useful to know total compile time for file is reduced when if we refactoring single function to split some small functions.

example

off(default)

$ ./bin/xcprofiler spec/fixtures/MyApp-xxxxxxxxxxx/Logs/Build/valid.xcactivitylog -l 5 -t 20
+--------------------------+------+----------------------+----------+
| File                     | Line | Method name          | Time(ms) |
+--------------------------+------+----------------------+----------+
| Interaction.swift        | 17   | get {}               | 69.9     |
| Matcher.swift            | 7    | get {}               | 68.9     |
| InteractionBuilder.swift | 87   | func clean()         | 49.8     |
| Session.swift            | 74   | public func run(c... | 49.6     |
| Session.swift            | 65   | @discardableResul... | 28.3     |
+--------------------------+------+----------------------+----------+

on

$ ./bin/xcprofiler spec/fixtures/MyApp-xxxxxxxxxxx/Logs/Build/valid.xcactivitylog -l 5 -t 20 --per-file
+--------------------------+------+-------------+----------+
| File                     | Line | Method name | Time(ms) |
+--------------------------+------+-------------+----------+
| Session.swift            | 0    |             | 83.4     |
| InteractionBuilder.swift | 0    |             | 81.5     |
| Interaction.swift        | 0    |             | 73.5     |
| Matcher.swift            | 0    |             | 70.9     |
| ServiceClient.swift      | 0    |             | 66.8     |
+--------------------------+------+-------------+----------+

thanks.

[r-plus]

oops, should I support Ruby 2.3 to pass CI? (Enumerable#sum method is added since 2.4.)

or drop support 2.3 and add 2.5 to CI matrix to support latest 2 minor versions of Ruby.

[giginet]

oops, should I support Ruby 2.3 to pass CI?

Yes. Because default Ruby on macOS is still Ruby 2.3...

I recommend you to use just call reduce instead of sum.

executions.map(:time).reduce(:+)

[r-plus]

okey, I understand support policy for this project. and thanks for your suggestion to do it, I'll fix it.

[r-plus]

Fixed to support Ruby 2.3. @giginet Could you review it?