comparison tests/test-revset.t @ 41680:8185c8abce87

revset: add expectsize to check the size of a set

`expectsize(<set>, <int>)` revset fails if `<set>` is not exactly `<int>`
elements. `expectsize(<set>, <min>:<max>)` revset fails if `<set>` is not
exactly between `<min>` and `<max>` inclusive.

This then allows an alias for `hg next` to be `update -r one(children(.))`
with sane failure behavior, and also makes some other scripting tasks
a little less difficult.

(Summary from WeShouldDoThat)

Differential Revision: https://phab.mercurial-scm.org/D5813

41679:91701785c2c5

        (symbol 'rev')
        (symbol '0'))))
  * set:
  <baseset+ [0]>
  0

41680:8185c8abce87

        (symbol 'rev')
        (symbol '0'))))
  * set:
  <baseset+ [0]>
  0

abort if the revset doesn't expect given size
  $ log 'expectsize()'
  hg: parse error: invalid set of arguments
  [255]
  $ log 'expectsize(0:2, a)'
  hg: parse error: expectsize requires a size range or a positive integer
  [255]
  $ log 'expectsize(0:2, 3)'
  0
  1
  2

  $ log 'expectsize(2:0, 3)'
  2
  1
  0
  $ log 'expectsize(0:1, 1)'
  abort: revset size mismatch. expected 1, got 2!
  [255]
  $ log 'expectsize(0:4, -1)'
  hg: parse error: negative size
  [255]
  $ log 'expectsize(0:2, 2:4)'
  0
  1
  2
  $ log 'expectsize(0:1, 3:5)'
  abort: revset size mismatch. expected between 3 and 5, got 2!
  [255]
  $ log 'expectsize(0:1, -1:2)'
  hg: parse error: negative size
  [255]
  $ log 'expectsize(0:1, 1:-2)'
  hg: parse error: negative size
  [255]
  $ log 'expectsize(0:2, a:4)'
  hg: parse error: size range bounds must be integers
  [255]
  $ log 'expectsize(0:2, 2:b)'
  hg: parse error: size range bounds must be integers
  [255]
  $ log 'expectsize(0:2, 2:)'
  0
  1
  2
  $ log 'expectsize(0:2, :5)'
  0
  1
  2
  $ log 'expectsize(0:2, :)'
  0
  1
  2
  $ log 'expectsize(0:2, 4:)'
  abort: revset size mismatch. expected between 4 and 11, got 3!
  [255]
  $ log 'expectsize(0:2, :2)'
  abort: revset size mismatch. expected between 0 and 2, got 3!
  [255]