$ hg init repo

  $ cd repo

  $ cat > a <<EOF

  > c

  > c

  > a

  > a

  > b

  > a

  > a

  > c

  > c

  > EOF

  $ hg ci -Am adda

  adding a

  $ cat > a <<EOF

  > c

  > c

  > a

  > a

  > dd

  > a

  > a

  > c

  > c

  > EOF

default context

  $ hg diff --nodates

  diff -r cf9f4ba66af2 a

  --- a/a

  +++ b/a

  @@ -2,7 +2,7 @@

   c

   a

   a

  -b

  +dd

   a

   a

   c

invalid --unified

  $ hg diff --nodates -U foo

  abort: diff context lines count must be an integer, not 'foo'

  [255]

  $ hg diff --nodates -U 2

  diff -r cf9f4ba66af2 a

  --- a/a

  +++ b/a

  @@ -3,5 +3,5 @@

   a

   a

  -b

  +dd

   a

   a

  $ hg --config diff.unified=2 diff --nodates

  diff -r cf9f4ba66af2 a

  --- a/a

  +++ b/a

  @@ -3,5 +3,5 @@

   a

   a

  -b

  +dd

   a

   a

  $ hg diff --nodates -U 1

  diff -r cf9f4ba66af2 a

  --- a/a

  +++ b/a

  @@ -4,3 +4,3 @@

   a

  -b

  +dd

   a

invalid diff.unified

  $ hg --config diff.unified=foo diff --nodates

  abort: diff context lines count must be an integer, not 'foo'

  [255]

0 lines of context hunk header matches gnu diff hunk header

  $ hg init diffzero

  $ cd diffzero

  $ cat > f1 << EOF

  > c2

  > c4

  > c5

  > EOF

  $ hg commit -Am0

  adding f1

  $ cat > f2 << EOF

  > c1

  > c2

  > c3

  > c4

  > EOF

  $ mv f2 f1

  $ hg diff -U0 --nodates

  diff -r 55d8ff78db23 f1

  --- a/f1

  +++ b/f1

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

  +c1

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

  +c3

  @@ -3,1 +4,0 @@

  -c5

  $ hg diff -U0 --nodates --git

  diff --git a/f1 b/f1

  --- a/f1

  +++ b/f1

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

  +c1

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

  +c3

  @@ -3,1 +4,0 @@

  -c5

  $ hg diff -U0 --nodates -p

  diff -r 55d8ff78db23 f1

  --- a/f1

  +++ b/f1

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

  +c1

  @@ -1,0 +3,1 @@ c2

  +c3

  @@ -3,1 +4,0 @@ c4

  -c5

  $ echo a > f1

  $ hg ci -m movef2

Test diff headers terminating with TAB when necessary (issue3357)

Regular diff --nodates, file creation

  $ hg mv f1 'f 1'

  $ echo b > 'f 1'

  $ hg diff --nodates 'f 1'

  diff -r 7574207d0d15 f 1

  --- /dev/null

  +++ b/f 1	

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

  +b

Git diff, adding space

  $ hg diff --git

  diff --git a/f1 b/f 1

  rename from f1

  rename to f 1

  --- a/f1

  +++ b/f 1	

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

  -a

  +b

Regular diff --nodates, file deletion

  $ hg ci -m addspace

  $ hg mv 'f 1' f1

  $ echo a > f1

  $ hg diff --nodates 'f 1'

  diff -r ca50fe67c9c7 f 1

  --- a/f 1	

  +++ /dev/null

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

  -b

Git diff, removing space

  $ hg diff --git

  diff --git a/f 1 b/f1

  rename from f 1

  rename to f1

  --- a/f 1	

  +++ b/f1

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

  -b

  +a