#!/bin/sh
#
# Copyright (c) 2005 Jon Seymour
#

test_description='Tests git-rev-list --merge-order functionality'

. ./test-lib.sh

#
# TODO: move the following block (upto --- end ...) into testlib.sh
#
[ -d .git/refs/tags ] || mkdir -p .git/refs/tags

sed_script="";

# Answer the sha1 has associated with the tag. The tag must exist in .git or .git/refs/tags
tag()
{
        _tag=$1
        [ -f .git/refs/tags/$_tag ] || error "tag: \"$_tag\" does not exist"
        cat .git/refs/tags/$_tag
}

# Generate a commit using the text specified to make it unique and the tree
# named by the tag specified.
unique_commit()
{
        _text=$1
        _tree=$2
        shift 2
        echo $_text | git-commit-tree $(tag $_tree) "$@"
}

# Save the output of a command into the tag specified. Prepend
# a substitution script for the tag onto the front of $sed_script
save_tag()
{
        _tag=$1 
        [ -n "$_tag" ] || error "usage: save_tag tag commit-args ..."
        shift 1
        "$@" >.git/refs/tags/$_tag
        sed_script="s/$(tag $_tag)/$_tag/g${sed_script+;}$sed_script"
}

# Replace unhelpful sha1 hashses with their symbolic equivalents 
entag()
{
        sed "$sed_script"
}

# Execute a command after first saving, then setting the GIT_AUTHOR_EMAIL
# tag to a specified value. Restore the original value on return.
as_author()
{
        _author=$1
        shift 1
        _save=$GIT_AUTHOR_EMAIL

        export GIT_AUTHOR_EMAIL="$_author"
        "$@"
        export GIT_AUTHOR_EMAIL="$_save"
}

commit_date()
{
        _commit=$1
        git-cat-file commit $_commit | sed -n "s/^committer .*> \([0-9]*\) .*/\1/p" 
}

on_committer_date()
{
    _date=$1
    shift 1
    GIT_COMMITTER_DATE=$_date "$@"
}

# Execute a command and suppress any error output.
hide_error()
{
        "$@" 2>/dev/null
}

check_output()
{
        _name=$1
        shift 1
        if "$@" | entag > $_name.actual
        then
                diff $_name.expected $_name.actual
        else
                return 1;
        fi
        
}

# Turn a reasonable test description into a reasonable test name.
# All alphanums translated into -'s which are then compressed and stripped
# from front and back.
name_from_description()
{
        tr "'" '-' | tr '~`!@#$%^&*()_+={}[]|\;:"<>,/? ' '-' | tr -s '-' | tr '[A-Z]' '[a-z]' | sed "s/^-*//;s/-*\$//"
}


# Execute the test described by the first argument, by eval'ing
# command line specified in the 2nd argument. Check the status code
# is zero and that the output matches the stream read from 
# stdin.
test_output_expect_success()
{       
        _description=$1
        _test=$2
        [ $# -eq 2 ] || error "usage: test_output_expect_success description test <<EOF ... EOF"
        _name=$(echo $_description | name_from_description)
        cat > $_name.expected
        test_expect_success "$_description" "check_output $_name $_test" 
}

# --- end of stuff to move ---

# test-case specific test function
check_adjacency()
{
    read previous
    echo "= $previous"
    while read next
    do
        if ! (git-cat-file commit $previous | grep "^parent $next" >/dev/null)
        then
            echo "^ $next"
        else
            echo "| $next"
        fi
        previous=$next
    done
}

list_duplicates()
{
    "$@" | sort | uniq -d
}

grep_stderr()
{
    args=$1
    shift 1
    "$@" 2>&1 | grep "$args"
}

date >path0
git-update-cache --add path0
save_tag tree git-write-tree
on_committer_date "1971-08-16 00:00:00" hide_error save_tag root unique_commit root tree
on_committer_date "1971-08-16 00:00:01" save_tag l0 unique_commit l0 tree -p root
on_committer_date "1971-08-16 00:00:02" save_tag l1 unique_commit l1 tree -p l0
on_committer_date "1971-08-16 00:00:03" save_tag l2 unique_commit l2 tree -p l1
on_committer_date "1971-08-16 00:00:04" save_tag a0 unique_commit a0 tree -p l2
on_committer_date "1971-08-16 00:00:05" save_tag a1 unique_commit a1 tree -p a0
on_committer_date "1971-08-16 00:00:06" save_tag b1 unique_commit b1 tree -p a0
on_committer_date "1971-08-16 00:00:07" save_tag c1 unique_commit c1 tree -p b1
on_committer_date "1971-08-16 00:00:08" as_author foobar@example.com save_tag b2 unique_commit b2 tree -p b1
on_committer_date "1971-08-16 00:00:09" save_tag b3 unique_commit b2 tree -p b2
on_committer_date "1971-08-16 00:00:10" save_tag c2 unique_commit c2 tree -p c1 -p b2
on_committer_date "1971-08-16 00:00:11" save_tag c3 unique_commit c3 tree -p c2
on_committer_date "1971-08-16 00:00:12" save_tag a2 unique_commit a2 tree -p a1
on_committer_date "1971-08-16 00:00:13" save_tag a3 unique_commit a3 tree -p a2
on_committer_date "1971-08-16 00:00:14" save_tag b4 unique_commit b4 tree -p b3 -p a3
on_committer_date "1971-08-16 00:00:15" save_tag a4 unique_commit a4 tree -p a3 -p b4 -p c3
on_committer_date "1971-08-16 00:00:16" save_tag l3 unique_commit l3 tree -p a4
on_committer_date "1971-08-16 00:00:17" save_tag l4 unique_commit l4 tree -p l3
on_committer_date "1971-08-16 00:00:18" save_tag l5 unique_commit l5 tree -p l4
on_committer_date "1971-08-16 00:00:19" save_tag m1 unique_commit m1 tree -p a4 -p c3
on_committer_date "1971-08-16 00:00:20" save_tag m2 unique_commit m2 tree -p c3 -p a4
#
# note: as of 20/6, it isn't possible to create duplicate parents, so this
# can't be tested.
#
#on_committer_date "1971-08-16 00:00:20" save_tag m3 unique_commit m3 tree -p c3 -p a4 -p c3
hide_error save_tag e1 as_author e@example.com unique_commit e1 tree
save_tag e2 as_author e@example.com unique_commit e2 tree -p e1
save_tag f1 as_author f@example.com unique_commit f1 tree -p e1
save_tag e3 as_author e@example.com unique_commit e3 tree -p e2
save_tag f2 as_author f@example.com unique_commit f2 tree -p f1
save_tag e4 as_author e@example.com unique_commit e4 tree -p e3 -p f2
save_tag e5 as_author e@example.com unique_commit e5 tree -p e4
save_tag f3 as_author f@example.com unique_commit f3 tree -p f2
save_tag f4 as_author f@example.com unique_commit f4 tree -p f3
save_tag e6 as_author e@example.com unique_commit e6 tree -p e5 -p f4
save_tag f5 as_author f@example.com unique_commit f5 tree -p f4
save_tag f6 as_author f@example.com unique_commit f6 tree -p f5 -p e6
save_tag e7 as_author e@example.com unique_commit e7 tree -p e6
save_tag e8 as_author e@example.com unique_commit e8 tree -p e7
save_tag e9 as_author e@example.com unique_commit e9 tree -p e8
save_tag f7 as_author f@example.com unique_commit f7 tree -p f6
save_tag f8 as_author f@example.com unique_commit f8 tree -p f7
save_tag f9 as_author f@example.com unique_commit f9 tree -p f8
save_tag e10 as_author e@example.com unique_commit e1 tree -p e9 -p f8

hide_error save_tag g0 unique_commit g0 tree
save_tag g1 unique_commit g1 tree -p g0
save_tag h1 unique_commit g2 tree -p g0
save_tag g2 unique_commit g3 tree -p g1 -p h1
save_tag h2 unique_commit g4 tree -p g2
save_tag g3 unique_commit g5 tree -p g2
save_tag g4 unique_commit g6 tree -p g3 -p h2

tag l5 > .git/HEAD

#
# cd to t/trash and use 
#
#    git-rev-list ... 2>&1 | sed "$(cat sed.script)" 
#
# if you ever want to manually debug the operation of git-rev-list
#
echo $sed_script > sed.script

test_expect_success 'rev-list has correct number of entries' 'git-rev-list HEAD | wc -l | tr -s " "' <<EOF
19
EOF

normal_adjacency_count=$(git-rev-list HEAD | check_adjacency | grep -c "\^" | tr -d ' ')
merge_order_adjacency_count=$(git-rev-list --merge-order HEAD | check_adjacency | grep -c "\^" | tr -d ' ')
test_expect_success '--merge-order produces as many or fewer discontinuities' '[ $merge_order_adjacency_count -le $normal_adjacency_count ]'
test_output_expect_success 'simple merge order' 'git-rev-list --merge-order --show-breaks HEAD' <<EOF
= l5
| l4
| l3
= a4
| c3
| c2
| c1
^ b4
| b3
| b2
| b1
^ a3
| a2
| a1
= a0
| l2
| l1
| l0
= root
EOF

test_output_expect_success 'two diamonds merge order (g6)' 'git-rev-list --merge-order --show-breaks g4' <<EOF
= g4
| h2
^ g3
= g2
| h1
^ g1
= g0
EOF

test_output_expect_success 'multiple heads' 'git-rev-list --merge-order a3 b3 c3' <<EOF
c3
c2
c1
b3
b2
b1
a3
a2
a1
a0
l2
l1
l0
root
EOF

test_output_expect_success 'multiple heads, prune at a1' 'git-rev-list --merge-order a3 b3 c3 ^a1' <<EOF
c3
c2
c1
b3
b2
b1
a3
a2
EOF

test_output_expect_success 'multiple heads, prune at l1' 'git-rev-list --merge-order a3 b3 c3 ^l1' <<EOF
c3
c2
c1
b3
b2
b1
a3
a2
a1
a0
l2
EOF

test_output_expect_success 'cross-epoch, head at l5, prune at l1' 'git-rev-list --merge-order l5 ^l1' <<EOF
l5
l4
l3
a4
c3
c2
c1
b4
b3
b2
b1
a3
a2
a1
a0
l2
EOF

test_output_expect_success 'duplicated head arguments' 'git-rev-list --merge-order l5 l5 ^l1' <<EOF
l5
l4
l3
a4
c3
c2
c1
b4
b3
b2
b1
a3
a2
a1
a0
l2
EOF

test_output_expect_success 'prune near merge' 'git-rev-list --merge-order a4 ^c3' <<EOF
a4
b4
b3
a3
a2
a1
EOF

test_output_expect_success "head has no parent" 'git-rev-list --merge-order --show-breaks root' <<EOF
= root
EOF

test_output_expect_success "two nodes - one head, one base" 'git-rev-list --merge-order --show-breaks l0' <<EOF
= l0
= root
EOF

test_output_expect_success "three nodes one head, one internal, one base" 'git-rev-list --merge-order --show-breaks l1' <<EOF
= l1
| l0
= root
EOF

test_output_expect_success "linear prune l2 ^root" 'git-rev-list --merge-order --show-breaks l2 ^root' <<EOF
= l2
| l1
| l0
EOF

test_output_expect_success "linear prune l2 ^l0" 'git-rev-list --merge-order --show-breaks l2 ^l0' <<EOF
= l2
| l1
EOF

test_output_expect_success "linear prune l2 ^l1" 'git-rev-list --merge-order --show-breaks l2 ^l1' <<EOF
= l2
EOF

test_output_expect_success "linear prune l5 ^a4" 'git-rev-list --merge-order --show-breaks l5 ^a4' <<EOF
= l5
| l4
| l3
EOF

test_output_expect_success "linear prune l5 ^l3" 'git-rev-list --merge-order --show-breaks l5 ^l3' <<EOF
= l5
| l4
EOF

test_output_expect_success "linear prune l5 ^l4" 'git-rev-list --merge-order --show-breaks l5 ^l4' <<EOF
= l5
EOF

test_output_expect_success "max-count 10 - merge order" 'git-rev-list --merge-order --show-breaks --max-count=10 l5' <<EOF
= l5
| l4
| l3
= a4
| c3
| c2
| c1
^ b4
| b3
| b2
EOF

test_output_expect_success "max-count 10 - non merge order" 'git-rev-list --max-count=10 l5 | sort' <<EOF
a4
b2
b3
b4
c1
c2
c3
l3
l4
l5
EOF

test_output_expect_success '--max-age=c3, no --merge-order' "git-rev-list --max-age=$(commit_date c3) l5" <<EOF
l5
l4
l3
a4
b4
a3
a2
c3
EOF

test_output_expect_success '--max-age=c3, --merge-order' "git-rev-list --merge-order --max-age=$(commit_date c3) l5" <<EOF
l5
l4
l3
a4
c3
b4
a3
a2
EOF

test_output_expect_success 'one specified head reachable from another a4, c3, --merge-order' "list_duplicates git-rev-list --merge-order a4 c3" <<EOF
EOF

test_output_expect_success 'one specified head reachable from another c3, a4, --merge-order' "list_duplicates git-rev-list --merge-order c3 a4" <<EOF
EOF

test_output_expect_success 'one specified head reachable from another a4, c3, no --merge-order' "list_duplicates git-rev-list a4 c3" <<EOF
EOF

test_output_expect_success 'one specified head reachable from another c3, a4, no --merge-order' "list_duplicates git-rev-list c3 a4" <<EOF
EOF

test_output_expect_success 'graph with c3 and a4 parents of head' "list_duplicates git-rev-list m1" <<EOF
EOF

test_output_expect_success 'graph with a4 and c3 parents of head' "list_duplicates git-rev-list m2" <<EOF
EOF

test_expect_success "head ^head --merge-order" 'git-rev-list --merge-order --show-breaks a3 ^a3' <<EOF
EOF

#
# can't test this now - duplicate parents can't be created
#
#test_output_expect_success 'duplicate parents' 'git-rev-list --parents --merge-order --show-breaks m3' <<EOF
#= m3 c3 a4 c3
#| a4 c3 b4 a3
#| b4 a3 b3
#| b3 b2
#^ a3 a2
#| a2 a1
#| a1 a0
#^ c3 c2
#| c2 b2 c1
#| b2 b1
#^ c1 b1
#| b1 a0
#= a0 l2
#| l2 l1
#| l1 l0
#| l0 root
#= root
#EOF

test_expect_success "head ^head no --merge-order" 'git-rev-list a3 ^a3' <<EOF
EOF
#
#

test_done