$ hg init repo

  $ cd repo

  $ cat << EOF > a

  > Small Mathematical Series.

  > One

  > Two

  > Three

  > Four

  > Five

  > Hop we are done.

  > EOF

  $ hg add a

  $ hg commit -m ancestor

  $ cat << EOF > a

  > Small Mathematical Series.

  > 1

  > 2

  > 3

  > 4

  > 5

  > Hop we are done.

  > EOF

  $ hg commit -m branch1

  $ hg co 0

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ cat << EOF > a

  > Small Mathematical Series.

  > 1

  > 2

  > 3

  > 6

  > 8

  > Hop we are done.

  > EOF

  $ hg commit -m branch2

  created new head

  $ hg merge 1

  merging a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon

  [1]

  $ hg id

  618808747361+c0c68e4fe667+ tip

  $ echo "[commands]" >> $HGRCPATH

  $ echo "status.verbose=true" >> $HGRCPATH

  $ hg status

  M a

  ? a.orig

  # The repository is in an unfinished *merge* state.

  # Unresolved merge conflicts:

  # 

  #     a

  # 

  # To mark files as resolved:  hg resolve --mark FILE

  # To continue:    hg commit

  # To abort:       hg merge --abort

  $ hg status -Tjson

  [

   {

    "itemtype": "file",

    "path": "a",

    "status": "M",

    "unresolved": true

   },

   {

    "itemtype": "file",

    "path": "a.orig",

    "status": "?"

   },

   {

    "itemtype": "morestatus",

    "unfinished": "merge",

    "unfinishedmsg": "To continue:    hg commit\nTo abort:       hg merge --abort"

   }

  ]

  $ hg status -0

  M a\x00? a.orig\x00 (no-eol) (esc)

  $ cat a

  Small Mathematical Series.

  1

  2

  3

  <<<<<<< working copy: 618808747361 - test: branch2

  6

  8

  =======

  4

  5

  >>>>>>> merge rev:    c0c68e4fe667 - test: branch1

  Hop we are done.

  $ hg status --config commands.status.verbose=0

  M a

  ? a.orig

Verify custom conflict markers

  $ hg up -q --clean .

  $ cat <<EOF >> .hg/hgrc

  > [command-templates]

  > mergemarker = '{author} {rev}'

  > EOF

  $ hg merge 1

  merging a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon

  [1]

  $ cat a

  Small Mathematical Series.

  1

  2

  3

  <<<<<<< working copy: test 2

  6

  8

  =======

  4

  5

  >>>>>>> merge rev:    test 1

  Hop we are done.

Verify custom conflict markers with legacy config name

  $ hg up -q --clean .

  $ cat <<EOF >> .hg/hgrc

  > [ui]

  > mergemarkertemplate = '{author} {rev}'

  > EOF

  $ hg merge 1

  merging a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon

  [1]

  $ cat a

  Small Mathematical Series.

  1

  2

  3

  <<<<<<< working copy: test 2

  6

  8

  =======

  4

  5

  >>>>>>> merge rev:    test 1

  Hop we are done.

Verify line splitting of custom conflict marker which causes multiple lines

  $ hg up -q --clean .

  $ cat >> .hg/hgrc <<EOF

  > [command-templates]

  > mergemarker={author} {rev}\nfoo\nbar\nbaz

  > EOF

  $ hg -q merge 1

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  [1]

  $ cat a

  Small Mathematical Series.

  1

  2

  3

  <<<<<<< working copy: test 2

  6

  8

  =======

  4

  5

  >>>>>>> merge rev:    test 1

  Hop we are done.

Verify line trimming of custom conflict marker using multi-byte characters

  $ hg up -q --clean .

  $ "$PYTHON" <<EOF

  > fp = open('logfile', 'wb')

  > fp.write(b'12345678901234567890123456789012345678901234567890' +

  >          b'1234567890') # there are 5 more columns for 80 columns

  > 

  > # 2 x 4 = 8 columns, but 3 x 4 = 12 bytes

  > fp.write(u'\u3042\u3044\u3046\u3048'.encode('utf-8'))

  > 

  > fp.close()

  > EOF

  $ hg add logfile

  $ hg --encoding utf-8 commit --logfile logfile

  $ cat >> .hg/hgrc <<EOF

  > [command-templates]

  > mergemarker={desc|firstline}

  > EOF

  $ hg -q --encoding utf-8 merge 1

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  [1]

  $ cat a

  Small Mathematical Series.

  1

  2

  3

  <<<<<<< working copy: 1234567890123456789012345678901234567890123456789012345...

  6

  8

  =======

  4

  5

  >>>>>>> merge rev:    branch1

  Hop we are done.

Verify basic conflict markers

  $ hg up -q --clean 2

  $ printf "\n[ui]\nmergemarkers=basic\n" >> .hg/hgrc

  $ hg merge 1

  merging a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon

  [1]

  $ cat a

  Small Mathematical Series.

  1

  2

  3

  <<<<<<< working copy

  6

  8

  =======

  4

  5

  >>>>>>> merge rev

  Hop we are done.

internal:merge3

  $ hg up -q --clean .

  $ hg merge 1 --tool internal:merge3

  merging a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon

  [1]

  $ cat a

  Small Mathematical Series.

  <<<<<<< working copy

  1

  2

  3

  6

  8

  ||||||| common ancestor

  One

  Two

  Three

  Four

  Five

  =======

  1

  2

  3

  4

  5

  >>>>>>> merge rev

  Hop we are done.

internal:mergediff

  $ hg co -C 1

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ cat << EOF > a

  > Small Mathematical Series.

  > 1

  > 2

  > 3

  > 4

  > 4.5

  > 5

  > Hop we are done.

  > EOF

  $ hg co -m 2 -t internal:mergediff

  merging a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges

  [1]

  $ cat a

  Small Mathematical Series.

  1

  2

  3

  <<<<<<<

  ------- working copy parent

  +++++++ working copy

   4

  +4.5

   5

  ======= destination

  6

  8

  >>>>>>>

  Hop we are done.

Test the same thing as above but modify a bit more so we instead get the working

copy in full and the diff from base to destination.

  $ hg co -C 1

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ cat << EOF > a

  > Small Mathematical Series.

  > 1

  > 2

  > 3.5

  > 4.5

  > 5.5

  > Hop we are done.

  > EOF

  $ hg co -m 2 -t internal:mergediff

  merging a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges

  [1]

  $ cat a

  Small Mathematical Series.

  1

  2

  <<<<<<<

  ======= working copy

  3.5

  4.5

  5.5

  ------- working copy parent

  +++++++ destination

   3

  -4

  -5

  +6

  +8

  >>>>>>>

  Hop we are done.

Add some unconflicting changes on each head, to make sure we really

are merging, unlike :local and :other

  $ hg up -C

  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

  updated to "e0693e20f496: 123456789012345678901234567890123456789012345678901234567890????"

  1 other heads for branch "default"

  $ printf "\n\nEnd of file\n" >> a

  $ hg ci -m "Add some stuff at the end"

  $ hg up -r 1

  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ printf "Start of file\n\n\n" > tmp

  $ cat a >> tmp

  $ mv tmp a

  $ hg ci -m "Add some stuff at the beginning"

Now test :merge-other and :merge-local

  $ hg merge

  merging a

  warning: conflicts while merging a! (edit, then use 'hg resolve --mark')

  1 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon

  [1]

  $ hg resolve --tool :merge-other a

  merging a

  (no more unresolved files)

  $ cat a

  Start of file