[WIP] Preliminary prototype for collapsed output

[TheWebDevel]

Usecase: Difference between two structs.
Assertion: assert_equal

Current Output:

Collapsed Output:

Method: String Iteration

Implementation:

1. Computed the index of each occurrence with reference to (- or +). // [4, 5, 16, 17, 20, 21]
2. I have a cur_index and a peek_index.
3. If the difference between cur_index and peek_index is <= 5, I'll have those index and the intermediate values in the final collapsed output else I have a .... // [4, 5, 16, 17, 18, 19, 20, 21]

[aaronabramov]

might wanna have some more context around the changes and some hints around how much you skipped:

  A { 
    a: "Kelly"
... 20 lines hidden
    b: "blah blah"
-   c: 1
+   c: 2
    d: 4
... 20 lines hidden
}

[aaronabramov]

also. for the algorithm you probably want to do it at the same time you're constructing by keeping the unchanged_count counter as you're iterating through the diff, so you do everything in one pass.
you might need some lookahead for that

[TheWebDevel]

Yeah! I'm planning to do those things as well. As I said, this is a prelim first implementation prototype. I'll do that and let you know. :D Thanks!!

[TheWebDevel]

Sure. I'll optimize the approach. So, can I proceed with the lookahead approach and extend it? I'll reply to this thread with the outcome of this ASAP. :D

[aaronabramov]

also, we should probably have some threshold. if i'ts lass than 30 lines we don't collapse anything

[TheWebDevel]

Yeah!

[TheWebDevel]

Update:

I found a way to collapse the output with single iteration.(Sorry about the colors, Need to find a way to put em back :P)

Currently working on adding context to the diff. :))

[TheWebDevel]

Ok, I integrated colored_diff with my logic for collapsing large output. It's so far so good.

What'll I do next?

1. Going to write a lot of test cases.
2. If all good, Implement into the library as a feature and submit for review

Here are some of the results:
Struct diff

Vector diff

Thanks, @aaronabramov :D

[aaronabramov]

you might want some padding/context around changed lines!

right now you have

- 20
+ 3
... 10 lines collapsed

you probably want

- 20
+ 3
  4 // unchanged line
  5 // unchanged line
... 10 lines collapsed

[aaronabramov]

also need to find a good way to distinguish ... 10 lines collapsed from the acutual content. they're both grayed out right now :)

[TheWebDevel]

Noted! :D

[TheWebDevel]

PR: #61