view tests/test-rebase-templates.t @ 44861:065421e12248

files: speed up `hg files` when no flags change display

It's not the first time I see slowness from this command slow down
tools built on top of hg.

The majority of the time is spent merely printing the result before
this change, which is clearly not how it should be (especially since
the computation of the result also looks slow).

Running `hg files` in mozilla-central:

parent revision: 1,260s
this commit: 0,683s
this commit without batching ui.write: 0,931s
this commit replacing the body of the loop with `pass`: 0,566s

This looks like a prime candidate for a rust fast path, but until
then, it seems reasonable to optimize the python.

Differential Revision: https://phab.mercurial-scm.org/D8586

Testing templating for rebase command

Setup

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > rebase=
  > [experimental]
  > evolution=createmarkers
  > EOF

  $ hg init repo
  $ cd repo
  $ for ch in a b c d; do echo foo > $ch; hg commit -Aqm "Added "$ch; done

  $ hg log -G -T "{rev}:{node|short} {desc}"
  @  3:62615734edd5 Added d
  |
  o  2:28ad74487de9 Added c
  |
  o  1:29becc82797a Added b
  |
  o  0:18d04c59bb5d Added a
  
Getting the JSON output for nodechanges

  $ hg rebase -s 2 -d 0 -q -Tjson
  [
   {
    "nodechanges": {"28ad74487de9599d00d81085be739c61fc340652": ["849767420fd5519cf0026232411a943ed03cc9fb"], "62615734edd52f06b6fb9c2beb429e4fe30d57b8": ["df21b32134ba85d86bca590cbe9b8b7cbc346c53"]}
   }
  ]

  $ hg log -G -T "{rev}:{node|short} {desc}"
  @  5:df21b32134ba Added d
  |
  o  4:849767420fd5 Added c
  |
  | o  1:29becc82797a Added b
  |/
  o  0:18d04c59bb5d Added a
  
  $ hg rebase -s 1 -d 5 -q -T "{nodechanges|json}"
  {"29becc82797a4bc11ec8880b58eaecd2ab3e7760": ["d9d6773efc831c274eace04bc13e8e6412517139"]} (no-eol)

  $ hg log -G -T "{rev}:{node|short} {desc}"
  o  6:d9d6773efc83 Added b
  |
  @  5:df21b32134ba Added d
  |
  o  4:849767420fd5 Added c
  |
  o  0:18d04c59bb5d Added a
  

  $ hg rebase -s 6 -d 4 -q -T "{nodechanges % '{oldnode}:{newnodes % ' {node} '}'}"
  d9d6773efc831c274eace04bc13e8e6412517139: f48cd65c6dc3d2acb55da54402a5b029546e546f  (no-eol)

  $ hg log -G -T "{rev}:{node|short} {desc}"
  o  7:f48cd65c6dc3 Added b
  |
  | @  5:df21b32134ba Added d
  |/
  o  4:849767420fd5 Added c
  |
  o  0:18d04c59bb5d Added a
  


  $ hg rebase -s 7 -d 5 -q --keep -T "{nodechanges % '{oldnode}:{newnodes % ' {node} '}'}"
  f48cd65c6dc3d2acb55da54402a5b029546e546f: 6f7dda91e55e728fb798f3e44dbecf0ebaa83267  (no-eol)

  $ hg log -G -T "{rev}:{node|short} {desc}"
  o  8:6f7dda91e55e Added b
  |
  | o  7:f48cd65c6dc3 Added b
  | |
  @ |  5:df21b32134ba Added d
  |/
  o  4:849767420fd5 Added c
  |
  o  0:18d04c59bb5d Added a