$ cat >> $HGRCPATH << EOF

  > [extensions]

  > absorb=

  > EOF

  $ sedi() { # workaround check-code

  > pattern="$1"

  > shift

  > for i in "$@"; do

  >     sed "$pattern" "$i" > "$i".tmp

  >     mv "$i".tmp "$i"

  > done

  > }

  $ hg init repo1

  $ cd repo1

Do not crash with empty repo:

  $ hg absorb

  abort: no changeset to change

  [255]

Make some commits:

  $ for i in 1 2 3 4 5; do

  >   echo $i >> a

  >   hg commit -A a -m "commit $i" -q

  > done

  $ hg annotate a

  0: 1

  1: 2

  2: 3

  3: 4

  4: 5

Change a few lines:

  $ cat > a <<EOF

  > 1a

  > 2b

  > 3

  > 4d

  > 5e

  > EOF

Preview absorb changes:

  $ hg absorb --print-changes --dry-run

  showing changes for a

          @@ -0,2 +0,2 @@

  4ec16f8 -1

  5c5f952 -2

  4ec16f8 +1a

  5c5f952 +2b

          @@ -3,2 +3,2 @@

  ad8b8b7 -4

  4f55fa6 -5

  ad8b8b7 +4d

  4f55fa6 +5e

Run absorb:

  $ hg absorb

  saved backup bundle to * (glob)

  2 of 2 chunk(s) applied

  $ hg annotate a

  0: 1a

  1: 2b

  2: 3

  3: 4d

  4: 5e

Delete a few lines and related commits will be removed if they will be empty:

  $ cat > a <<EOF

  > 2b

  > 4d

  > EOF

  $ hg absorb

  saved backup bundle to * (glob)

  3 of 3 chunk(s) applied

  $ hg annotate a

  1: 2b

  2: 4d

  $ hg log -T '{rev} {desc}\n' -Gp

  @  2 commit 4

  |  diff -r 1cae118c7ed8 -r 58a62bade1c6 a

  |  --- a/a	Thu Jan 01 00:00:00 1970 +0000

  |  +++ b/a	Thu Jan 01 00:00:00 1970 +0000

  |  @@ -1,1 +1,2 @@

  |   2b

  |  +4d

  |

  o  1 commit 2

  |  diff -r 84add69aeac0 -r 1cae118c7ed8 a

  |  --- a/a	Thu Jan 01 00:00:00 1970 +0000

  |  +++ b/a	Thu Jan 01 00:00:00 1970 +0000

  |  @@ -0,0 +1,1 @@

  |  +2b

  |

  o  0 commit 1

Non 1:1 map changes will be ignored:

  $ echo 1 > a

  $ hg absorb

  nothing applied

  [1]

Insertaions:

  $ cat > a << EOF

  > insert before 2b

  > 2b

  > 4d

  > insert aftert 4d

  > EOF

  $ hg absorb -q

  $ hg status

  $ hg annotate a

  1: insert before 2b

  1: 2b

  2: 4d

  2: insert aftert 4d

Bookmarks are moved:

  $ hg bookmark -r 1 b1

  $ hg bookmark -r 2 b2

  $ hg bookmark ba

  $ hg bookmarks

     b1                        1:b35060a57a50

     b2                        2:946e4bc87915

   * ba                        2:946e4bc87915

  $ sedi 's/insert/INSERT/' a

  $ hg absorb -q

  $ hg status

  $ hg bookmarks

     b1                        1:a4183e9b3d31

     b2                        2:c9b20c925790

   * ba                        2:c9b20c925790

Non-mofified files are ignored:

  $ touch b

  $ hg commit -A b -m b

  $ touch c

  $ hg add c

  $ hg rm b

  $ hg absorb

  nothing applied

  [1]

  $ sedi 's/INSERT/Insert/' a

  $ hg absorb

  saved backup bundle to * (glob)

  2 of 2 chunk(s) applied

  $ hg status

  A c

  R b

Public commits will not be changed:

  $ hg phase -p 1

  $ sedi 's/Insert/insert/' a

  $ hg absorb -pn

  showing changes for a

          @@ -0,1 +0,1 @@

          -Insert before 2b

          +insert before 2b

          @@ -3,1 +3,1 @@

  85b4e0e -Insert aftert 4d

  85b4e0e +insert aftert 4d

  $ hg absorb

  saved backup bundle to * (glob)

  1 of 2 chunk(s) applied

  $ hg diff -U 0

  diff -r 1c8eadede62a a

  --- a/a	Thu Jan 01 00:00:00 1970 +0000

  +++ b/a	* (glob)

  @@ -1,1 +1,1 @@

  -Insert before 2b

  +insert before 2b

  $ hg annotate a

  1: Insert before 2b

  1: 2b

  2: 4d

  2: insert aftert 4d

Make working copy clean:

  $ hg revert -q -C a b

  $ hg forget c

  $ rm c

  $ hg status

Merge commit will not be changed:

  $ echo 1 > m1

  $ hg commit -A m1 -m m1

  $ hg bookmark -q -i m1

  $ hg update -q '.^'

  $ echo 2 > m2

  $ hg commit -q -A m2 -m m2

  $ hg merge -q m1

  $ hg commit -m merge

  $ hg bookmark -d m1

  $ hg log -G -T '{rev} {desc} {phase}\n'

  @    6 merge draft

  |\

  | o  5 m2 draft

  | |

  o |  4 m1 draft

  |/

  o  3 b draft

  |

  o  2 commit 4 draft

  |

  o  1 commit 2 public

  |

  o  0 commit 1 public

  $ echo 2 >> m1

  $ echo 2 >> m2

  $ hg absorb

  abort: no changeset to change

  [255]

  $ hg revert -q -C m1 m2

Use a new repo:

  $ cd ..

  $ hg init repo2

  $ cd repo2

Make some commits to multiple files:

  $ for f in a b; do

  >   for i in 1 2; do

  >     echo $f line $i >> $f

  >     hg commit -A $f -m "commit $f $i" -q

  >   done

  > done

Use pattern to select files to be fixed up:

  $ sedi 's/line/Line/' a b

  $ hg status

  M a

  M b

  $ hg absorb a

  saved backup bundle to * (glob)

  1 of 1 chunk(s) applied

  $ hg status

  M b

  $ hg absorb --exclude b

  nothing applied

  [1]

  $ hg absorb b

  saved backup bundle to * (glob)

  1 of 1 chunk(s) applied

  $ hg status

  $ cat a b

  a Line 1

  a Line 2

  b Line 1

  b Line 2

Test config option absorb.maxstacksize:

  $ sedi 's/Line/line/' a b

  $ hg log -T '{rev}:{node} {desc}\n'

  3:712d16a8f445834e36145408eabc1d29df05ec09 commit b 2

  2:74cfa6294160149d60adbf7582b99ce37a4597ec commit b 1

  1:28f10dcf96158f84985358a2e5d5b3505ca69c22 commit a 2

  0:f9a81da8dc53380ed91902e5b82c1b36255a4bd0 commit a 1

  $ hg --config absorb.maxstacksize=1 absorb -pn

  absorb: only the recent 1 changesets will be analysed

  showing changes for a

          @@ -0,2 +0,2 @@

          -a Line 1

          -a Line 2

          +a line 1

          +a line 2

  showing changes for b

          @@ -0,2 +0,2 @@

          -b Line 1

  712d16a -b Line 2

          +b line 1

  712d16a +b line 2

Test obsolete markers creation:

  $ cat >> $HGRCPATH << EOF

  > [experimental]

  > evolution=createmarkers

  > [absorb]

  > addnoise=1

  > EOF

  $ hg --config absorb.maxstacksize=3 sf

  absorb: only the recent 3 changesets will be analysed

  2 of 2 chunk(s) applied

  $ hg log -T '{rev}:{node|short} {desc} {get(extras, "absorb_source")}\n'

  6:3dfde4199b46 commit b 2 712d16a8f445834e36145408eabc1d29df05ec09

  5:99cfab7da5ff commit b 1 74cfa6294160149d60adbf7582b99ce37a4597ec

  4:fec2b3bd9e08 commit a 2 28f10dcf96158f84985358a2e5d5b3505ca69c22

  0:f9a81da8dc53 commit a 1 

  $ hg absorb

  1 of 1 chunk(s) applied

  $ hg log -T '{rev}:{node|short} {desc} {get(extras, "absorb_source")}\n'

  10:e1c8c1e030a4 commit b 2 3dfde4199b4610ea6e3c6fa9f5bdad8939d69524

  9:816c30955758 commit b 1 99cfab7da5ffdaf3b9fc6643b14333e194d87f46

  8:5867d584106b commit a 2 fec2b3bd9e0834b7cb6a564348a0058171aed811

  7:8c76602baf10 commit a 1 f9a81da8dc53380ed91902e5b82c1b36255a4bd0

Executable files:

  $ cat >> $HGRCPATH << EOF

  > [diff]

  > git=True

  > EOF

  $ cd ..

  $ hg init repo3

  $ cd repo3

  $ echo > foo.py

  $ chmod +x foo.py

  $ hg add foo.py

  $ hg commit -mfoo

  $ echo bla > foo.py

  $ hg absorb --dry-run --print-changes

  showing changes for foo.py

          @@ -0,1 +0,1 @@

  99b4ae7 -

  99b4ae7 +bla

  $ hg absorb

  1 of 1 chunk(s) applied

  $ hg diff -c .

  diff --git a/foo.py b/foo.py

  new file mode 100755

  --- /dev/null

  +++ b/foo.py

  @@ -0,0 +1,1 @@

  +bla

  $ hg diff

Remove lines may delete changesets:

  $ cd ..

  $ hg init repo4

  $ cd repo4

  $ cat > a <<EOF

  > 1

  > 2

  > EOF

  $ hg commit -m a12 -A a

  $ cat > b <<EOF

  > 1

  > 2

  > EOF

  $ hg commit -m b12 -A b

  $ echo 3 >> b

  $ hg commit -m b3

  $ echo 4 >> b

  $ hg commit -m b4

  $ echo 1 > b

  $ echo 3 >> a

  $ hg absorb -pn

  showing changes for a

          @@ -2,0 +2,1 @@

  bfafb49 +3

  showing changes for b

          @@ -1,3 +1,0 @@

  1154859 -2

  30970db -3

  a393a58 -4

  $ hg absorb -v | grep became

  bfafb49242db: 1 file(s) changed, became 1a2de97fc652

  115485984805: 2 file(s) changed, became 0c930dfab74c

  30970dbf7b40: became empty and was dropped

  a393a58b9a85: became empty and was dropped

  $ hg log -T '{rev} {desc}\n' -Gp

  @  5 b12

  |  diff --git a/b b/b

  |  new file mode 100644

  |  --- /dev/null

  |  +++ b/b

  |  @@ -0,0 +1,1 @@

  |  +1

  |

  o  4 a12

     diff --git a/a b/a

     new file mode 100644

     --- /dev/null

     +++ b/a

     @@ -0,0 +1,3 @@