# revision 0
adding f
# revision 1
# revision 2
created new head
# revision 3 - simple to merge
created new head


Tool selection

# default is internal merge:
[merge-tools]
# hg update -C 1
# hg merge -r 2
merging f
warning: conflicts during merge.
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
<<<<<<< local
revision 1
=======
revision 2
>>>>>>> other
space
# hg stat
M f
? f.orig

# simplest hgrc using false for merge:
[merge-tools]
false.whatever=
# hg update -C 1
# hg merge -r 2
merging f
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig

# true with higher .priority gets precedence:
[merge-tools]
false.whatever=
true.priority=1
# hg update -C 1
# hg merge -r 2
merging f
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
revision 1
space
# hg stat
M f

# unless lowered on command line:
[merge-tools]
false.whatever=
true.priority=1
# hg update -C 1
# hg merge -r 2 --config merge-tools.true.priority=-7
merging f
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig

# or false set higher on command line:
[merge-tools]
false.whatever=
true.priority=1
# hg update -C 1
# hg merge -r 2 --config merge-tools.false.priority=117
merging f
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig

# or true.executable not found in PATH:
[merge-tools]
false.whatever=
true.priority=1
# hg update -C 1
# hg merge -r 2 --config merge-tools.true.executable=nonexistingmergetool
merging f
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig

# or true.executable with bogus path:
[merge-tools]
false.whatever=
true.priority=1
# hg update -C 1
# hg merge -r 2 --config merge-tools.true.executable=/bin/nonexistingmergetool
merging f
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig

# but true.executable set to cat found in PATH works:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2
revision 1
space
revision 0
space
revision 2
space
merging f
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
revision 1
space
# hg stat
M f

# and true.executable set to cat with path works:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config merge-tools.true.executable=cat
revision 1
space
revision 0
space
revision 2
space
merging f
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
revision 1
space
# hg stat
M f


Tool selection and merge-patterns

# merge-patterns specifies new tool false:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config merge-patterns.f=false
merging f
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig

# merge-patterns specifies executable not found in PATH and gets warning:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config merge-patterns.f=true --config merge-tools.true.executable=nonexistingmergetool
couldn't find merge tool true specified for f
merging f
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig

# merge-patterns specifies executable with bogus path and gets warning:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config merge-patterns.f=true --config merge-tools.true.executable=/bin/nonexistingmergetool
couldn't find merge tool true specified for f
merging f
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig


ui.merge overrules priority

# ui.merge specifies false:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config ui.merge=false
merging f
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig

# ui.merge specifies internal:fail:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config ui.merge=internal:fail
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f

# ui.merge specifies internal:local:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config ui.merge=internal:local
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
revision 1
space
# hg stat
M f

# ui.merge specifies internal:other:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config ui.merge=internal:other
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
revision 2
space
# hg stat
M f

# ui.merge specifies internal:prompt:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config ui.merge=internal:prompt
 no tool found to merge f
keep (l)ocal or take (o)ther? l
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
revision 1
space
# hg stat
M f

# ui.merge specifies internal:dump:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config ui.merge=internal:dump
merging f
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.base
? f.local
? f.orig
? f.other

f.base:
revision 0
space
f.local:
revision 1
space
f.other:
revision 2
space

# ui.merge specifies internal:other but is overruled by pattern for false:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 2 --config ui.merge=internal:other --config merge-patterns.f=false
merging f
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig


Premerge

# Default is silent simplemerge:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 3
merging f
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
revision 1
space
revision 3
# hg stat
M f

# .premerge=True is same:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 3 --config merge-tools.true.premerge=True
merging f
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
revision 1
space
revision 3
# hg stat
M f

# .premerge=False executes merge-tool:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -r 3 --config merge-tools.true.premerge=False
revision 1
space
revision 0
space
revision 0
space
revision 3
merging f
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
revision 1
space
# hg stat
M f


Tool execution

# set tools.args explicit to include $base $local $other $output:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
==> ... <==
revision 0
space

==> ... <==
revision 1
space

==> ... <==
revision 2
space

==> ... <==
revision 1
space
merging f
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
revision 1
space
# hg stat
M f

# Merge with "echo mergeresult > $local":
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
merging f
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
mergeresult
# hg stat
M f

# - and $local is the file f:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
merging f
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
mergeresult
# hg stat
M f

# Merge with "echo mergeresult > $output" - the variable is a bit magic:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
merging f
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
# cat f
mergeresult
# hg stat
M f


Merge post-processing

# cat is a bad merge-tool and doesn't change:
[merge-tools]
false.whatever=
true.priority=1
true.executable=cat
# hg update -C 1
# hg merge -y -r 2 --config merge-tools.true.checkchanged=1
revision 1
space
revision 0
space
revision 2
space
merging f
 output file f appears unchanged
was merge successful (yn)? n
merging f failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
# cat f
revision 1
space
# hg stat
M f
? f.orig