mercurial/templates/map-cmdline.default

copies: avoid instancing more changectx to access parent revisions

We just need to know the revision numbers of the parents, creating full context
is needlessly expensive.

This provide a small, but noticeable performance boost.

revision: large amount; added files: large amount; rename small amount; c3b14617fbd7 9ba6ab77fd29
before: ! wall 2.885636 comb 2.900000 user 2.870000 sys 0.030000 (median of 10)
after:  ! wall 2.702270 comb 2.710000 user 2.690000 sys 0.020000 (median of 10)
revision: large amount; added files: small amount; rename small amount; c3b14617fbd7 f650a9b140d2
before: ! wall 4.298271 comb 4.290000 user 4.240000 sys 0.050000 (median of 10)
after:  ! wall 3.976610 comb 3.970000 user 3.920000 sys 0.050000 (median of 10)
revision: large amount; added files: large amount; rename large amount; 08ea3258278e d9fa043f30c0
before: ! wall 0.773397 comb 0.770000 user 0.770000 sys 0.000000 (median of 11)
after:  ! wall 0.701634 comb 0.700000 user 0.700000 sys 0.000000 (median of 13)
revision: small amount; added files: large amount; rename large amount; df6f7a526b60 a83dc6a2d56f
before: ! wall 0.013585 comb 0.010000 user 0.010000 sys 0.000000 (median of 217)
after:  ! wall 0.013550 comb 0.010000 user 0.010000 sys 0.000000 (median of 218)
revision: small amount; added files: large amount; rename small amount; 4aa4e1f8e19a 169138063d63
before: ! wall 0.003202 comb 0.000000 user 0.000000 sys 0.000000 (median of 929)
after:  ! wall 0.002993 comb 0.010000 user 0.010000 sys 0.000000 (median of 992)
revision: small amount; added files: small amount; rename small amount; 4bc173b045a6 964879152e2e
before: ! wall 0.000077 comb 0.000000 user 0.000000 sys 0.000000 (median of 12060)
after:  ! wall 0.000072 comb 0.000000 user 0.000000 sys 0.000000 (median of 12804)
revision: medium amount; added files: large amount; rename medium amount; c95f1ced15f2 2c68e87c3efe
before: ! wall 0.510614 comb 0.500000 user 0.500000 sys 0.000000 (median of 18)
after:  ! wall 0.473681 comb 0.470000 user 0.470000 sys 0.000000 (median of 20)
revision: medium amount; added files: medium amount; rename small amount; d343da0c55a8 d7746d32bf9d
before: ! wall 0.126552 comb 0.130000 user 0.130000 sys 0.000000 (median of 77)
after:  ! wall 0.115240 comb 0.110000 user 0.110000 sys 0.000000 (median of 85)

Differential Revision: https://phab.mercurial-scm.org/D7122

# Base templates. Due to name clashes with existing keywords, we have
# to replace some keywords with 'lkeyword', for 'labelled keyword'

[templates]
changeset = '{cset}{branches}{bookmarks}{tags}{parents}{luser}{ldate}{ltroubles}{lobsfate}{summary}\n'
changeset_quiet = '{lnode}'
changeset_verbose = '{cset}{branches}{bookmarks}{tags}{parents}{luser}{ldate}{ltroubles}{lobsfate}{lfiles}{lfile_copies_switch}{description}\n'
changeset_debug = '{fullcset}{branches}{bookmarks}{tags}{lphase}{parents}{manifest}{luser}{ldate}{ltroubles}{lobsfate}{lfile_mods}{lfile_adds}{lfile_dels}{lfile_copies_switch}{extras}{description}\n'

# File templates
lfiles = '{if(files,
               label("ui.note log.files",
                     "files:       {files}\n"))}'

lfile_mods = '{if(file_mods,
                  label("ui.debug log.files",
                        "files:       {file_mods}\n"))}'

lfile_adds = '{if(file_adds,
                  label("ui.debug log.files",
                        "files+:      {file_adds}\n"))}'

lfile_dels = '{if(file_dels,
                  label("ui.debug log.files",
                        "files-:      {file_dels}\n"))}'

lfile_copies_switch = '{if(file_copies_switch,
                           label("ui.note log.copies",
                                 "copies:     {file_copies_switch
                                               % ' {name} ({source})'}\n"))}'

# General templates
cset = '{labelcset("changeset:   {rev}:{node|short}")}\n'
fullcset = '{labelcset("changeset:   {rev}:{node}")}\n'

lphase = '{label("log.phase",
                 "phase:       {phase}")}\n'

parent = '{label("log.parent changeset.{phase}",
                  "parent:      {rev}:{node|formatnode}")}\n'

lnode = '{label("log.node",
                "{rev}:{node|short}")}\n'

manifest = '{label("ui.debug log.manifest",
                   "manifest:    {rev}:{node}")}\n'

branch = '{label("log.branch",
                 "branch:      {branch}")}\n'

tag = '{label("log.tag",
              "tag:         {tag}")}\n'

bookmark = '{label("log.bookmark",
                   "bookmark:    {bookmark}")}\n'

luser = '{label("log.user",
                "user:        {author}")}\n'

summary = '{if(desc|strip, "{label('log.summary',
                                   'summary:     {desc|firstline}')}\n")}'

ldate = '{label("log.date",
                "date:        {date|date}")}\n'

ltroubles = '{if(instabilities, "{label('log.instability',
                                   'instability: {join(instabilities, ", ")}')}\n")}'

extra = '{label("ui.debug log.extra",
                "extra:       {key}={value|stringescape}")}\n'

description = '{if(desc|strip, "{label('ui.note log.description',
                                       'description:')}
                                {label('ui.note log.description',
                                       '{desc|strip}')}\n\n")}'

status = '{status} {path|relpath}\n{if(source, "  {source|relpath}\n")}'

# Obsfate templates, it would be removed once we introduce the obsfate
# template fragment
lobsfate = '{if(obsfate, "{label('log.obsfate', '{obsfate % "obsolete:    {fate}\n"}')}")}'

[templatealias]
labelcset(expr) = label(separate(" ",
                                 "log.changeset",
                                 "changeset.{phase}",
                                 if(obsolete, "changeset.obsolete"),
                                 if(instabilities, "changeset.unstable"),
                                 join(instabilities
                                      % "instability.{instability}", " ")),
                        expr)