#!/bin/sh

test_description='combined diff'

. ./test-lib.sh
. "$TEST_DIRECTORY"/diff-lib.sh

setup_helper () {
        one=$1 branch=$2 side=$3 &&

        git branch $side $branch &&
        for l in $one two three fyra
        do
                echo $l
        done >file &&
        git add file &&
        test_tick &&
        git commit -m $branch &&
        git checkout $side &&
        for l in $one two three quatro
        do
                echo $l
        done >file &&
        git add file &&
        test_tick &&
        git commit -m $side &&
        test_must_fail git merge $branch &&
        for l in $one three four
        do
                echo $l
        done >file &&
        git add file &&
        test_tick &&
        git commit -m "merge $branch into $side"
}

verify_helper () {
        it=$1 &&

        # Ignore lines that were removed only from the other parent
        sed -e '
                1,/^@@@/d
                /^ -/d
                s/^\(.\)./\1/
        ' "$it" >"$it.actual.1" &&
        sed -e '
                1,/^@@@/d
                /^- /d
                s/^.\(.\)/\1/
        ' "$it" >"$it.actual.2" &&

        git diff "$it^" "$it" -- | sed -e '1,/^@@/d' >"$it.expect.1" &&
        test_cmp "$it.expect.1" "$it.actual.1" &&

        git diff "$it^2" "$it" -- | sed -e '1,/^@@/d' >"$it.expect.2" &&
        test_cmp "$it.expect.2" "$it.actual.2"
}

test_expect_success setup '
        >file &&
        git add file &&
        test_tick &&
        git commit -m initial &&

        git branch withone &&
        git branch sansone &&

        git checkout withone &&
        setup_helper one withone sidewithone &&

        git checkout sansone &&
        setup_helper "" sansone sidesansone
'

test_expect_success 'check combined output (1)' '
        git show sidewithone -- >sidewithone &&
        verify_helper sidewithone
'

test_expect_success 'check combined output (2)' '
        git show sidesansone -- >sidesansone &&
        verify_helper sidesansone
'

test_expect_success 'diagnose truncated file' '
        >file &&
        git add file &&
        git commit --amend -C HEAD &&
        git show >out &&
        grep "diff --cc file" out
'

test_expect_success 'setup for --cc --raw' '
        blob=$(echo file | git hash-object --stdin -w) &&
        base_tree=$(echo "100644 blob $blob     file" | git mktree) &&
        trees= &&
        for i in $(test_seq 1 40)
        do
                blob=$(echo file$i | git hash-object --stdin -w) &&
                trees="$trees$(echo "100644 blob $blob  file" | git mktree)$LF"
        done
'

test_expect_success 'check --cc --raw with four trees' '
        four_trees=$(echo "$trees" | sed -e 4q) &&
        git diff --cc --raw $four_trees $base_tree >out &&
        # Check for four leading colons in the output:
        grep "^::::[^:]" out
'

test_expect_success 'check --cc --raw with forty trees' '
        git diff --cc --raw $trees $base_tree >out &&
        # Check for forty leading colons in the output:
        grep "^::::::::::::::::::::::::::::::::::::::::[^:]" out
'

test_expect_success 'setup combined ignore spaces' '
        git checkout master &&
        >test &&
        git add test &&
        git commit -m initial &&

        tr -d Q <<-\EOF >test &&
        always coalesce
        eol space coalesce Q
        space  change coalesce
        all spa ces coalesce
        eol spaces Q
        space  change
        all spa ces
        EOF
        git commit -m "test space change" -a &&

        git checkout -b side HEAD^ &&
        tr -d Q <<-\EOF >test &&
        always coalesce
        eol space coalesce
        space change coalesce
        all spaces coalesce
        eol spaces
        space change
        all spaces
        EOF
        git commit -m "test other space changes" -a &&

        test_must_fail git merge master &&
        tr -d Q <<-\EOF >test &&
        eol spaces Q
        space  change
        all spa ces
        EOF
        git commit -m merged -a
'

test_expect_success 'check combined output (no ignore space)' '
        git show >actual.tmp &&
        sed -e "1,/^@@@/d" < actual.tmp >actual &&
        tr -d Q <<-\EOF >expected &&
        --always coalesce
        - eol space coalesce
        - space change coalesce
        - all spaces coalesce
        - eol spaces
        - space change
        - all spaces
         -eol space coalesce Q
         -space  change coalesce
         -all spa ces coalesce
        + eol spaces Q
        + space  change
        + all spa ces
        EOF
        compare_diff_patch expected actual
'

test_expect_success 'check combined output (ignore space at eol)' '
        git show --ignore-space-at-eol >actual.tmp &&
        sed -e "1,/^@@@/d" < actual.tmp >actual &&
        tr -d Q <<-\EOF >expected &&
        --always coalesce
        --eol space coalesce
        - space change coalesce
        - all spaces coalesce
         -space  change coalesce
         -all spa ces coalesce
          eol spaces Q
        - space change
        - all spaces
        + space  change
        + all spa ces
        EOF
        compare_diff_patch expected actual
'

test_expect_success 'check combined output (ignore space change)' '
        git show -b >actual.tmp &&
        sed -e "1,/^@@@/d" < actual.tmp >actual &&
        tr -d Q <<-\EOF >expected &&
        --always coalesce
        --eol space coalesce
        --space change coalesce
        - all spaces coalesce
         -all spa ces coalesce
          eol spaces Q
          space  change
        - all spaces
        + all spa ces
        EOF
        compare_diff_patch expected actual
'

test_expect_success 'check combined output (ignore all spaces)' '
        git show -w >actual.tmp &&
        sed -e "1,/^@@@/d" < actual.tmp >actual &&
        tr -d Q <<-\EOF >expected &&
        --always coalesce
        --eol space coalesce
        --space change coalesce
        --all spaces coalesce
          eol spaces Q
          space  change
          all spa ces
        EOF
        compare_diff_patch expected actual
'

test_expect_success 'combine diff coalesce simple' '
        >test &&
        git add test &&
        git commit -m initial &&
        test_seq 4 >test &&
        git commit -a -m empty1 &&
        git branch side1 &&
        git checkout HEAD^ &&
        test_seq 5 >test &&
        git commit -a -m empty2 &&
        test_must_fail git merge side1 &&
        >test &&
        git commit -a -m merge &&
        git show >actual.tmp &&
        sed -e "1,/^@@@/d" < actual.tmp >actual &&
        tr -d Q <<-\EOF >expected &&
        --1
        --2
        --3
        --4
        - 5
        EOF
        compare_diff_patch expected actual
'

test_expect_success 'combine diff coalesce tricky' '
        >test &&
        git add test &&
        git commit -m initial --allow-empty &&
        cat <<-\EOF >test &&
        3
        1
        2
        3
        4
        EOF
        git commit -a -m empty1 &&
        git branch -f side1 &&
        git checkout HEAD^ &&
        cat <<-\EOF >test &&
        1
        3
        5
        4
        EOF
        git commit -a -m empty2 &&
        git branch -f side2 &&
        test_must_fail git merge side1 &&
        >test &&
        git commit -a -m merge &&
        git show >actual.tmp &&
        sed -e "1,/^@@@/d" < actual.tmp >actual &&
        tr -d Q <<-\EOF >expected &&
         -3
        --1
         -2
        --3
        - 5
        --4
        EOF
        compare_diff_patch expected actual &&
        git checkout -f side1 &&
        test_must_fail git merge side2 &&
        >test &&
        git commit -a -m merge &&
        git show >actual.tmp &&
        sed -e "1,/^@@@/d" < actual.tmp >actual &&
        tr -d Q <<-\EOF >expected &&
        - 3
        --1
        - 2
        --3
         -5
        --4
        EOF
        compare_diff_patch expected actual
'

test_expect_failure 'combine diff coalesce three parents' '
        >test &&
        git add test &&
        git commit -m initial --allow-empty &&
        cat <<-\EOF >test &&
        3
        1
        2
        3
        4
        EOF
        git commit -a -m empty1 &&
        git checkout -B side1 &&
        git checkout HEAD^ &&
        cat <<-\EOF >test &&
        1
        3
        7
        5
        4
        EOF
        git commit -a -m empty2 &&
        git branch -f side2 &&
        git checkout HEAD^ &&
        cat <<-\EOF >test &&
        3
        1
        6
        5
        4
        EOF
        git commit -a -m empty3 &&
        >test &&
        git add test &&
        TREE=$(git write-tree) &&
        COMMIT=$(git commit-tree -p HEAD -p side1 -p side2 -m merge $TREE) &&
        git show $COMMIT >actual.tmp &&
        sed -e "1,/^@@@/d" < actual.tmp >actual &&
        tr -d Q <<-\EOF >expected &&
        -- 3
        ---1
        -  6
         - 2
         --3
          -7
        - -5
        ---4
        EOF
        compare_diff_patch expected actual
'

# Test for a bug reported at
# https://public-inbox.org/git/20130515143508.GO25742@login.drsnuggles.stderr.nl/
# where a delete lines were missing from combined diff output when they
# occurred exactly before the context lines of a later change.
test_expect_success 'combine diff missing delete bug' '
        git commit -m initial --allow-empty &&
        cat <<-\EOF >test &&
        1
        2
        3
        4
        EOF
        git add test &&
        git commit -a -m side1 &&
        git checkout -B side1 &&
        git checkout HEAD^ &&
        cat <<-\EOF >test &&
        0
        1
        2
        3
        4modified
        EOF
        git add test &&
        git commit -m side2 &&
        git branch -f side2 &&
        test_must_fail git merge --no-commit side1 &&
        cat <<-\EOF >test &&
        1
        2
        3
        4modified
        EOF
        git add test &&
        git commit -a -m merge &&
        git diff-tree -c -p HEAD >actual.tmp &&
        sed -e "1,/^@@@/d" < actual.tmp >actual &&
        tr -d Q <<-\EOF >expected &&
        - 0
          1
          2
          3
         -4
         +4modified
        EOF
        compare_diff_patch expected actual
'

test_expect_success 'combine diff gets tree sorting right' '
        # create a directory and a file that sort differently in trees
        # versus byte-wise (implied "/" sorts after ".")
        git checkout -f master &&
        mkdir foo &&
        echo base >foo/one &&
        echo base >foo/two &&
        echo base >foo.ext &&
        git add foo foo.ext &&
        git commit -m base &&

        # one side modifies a file in the directory, along with the root
        # file...
        echo master >foo/one &&
        echo master >foo.ext &&
        git commit -a -m master &&

        # the other side modifies the other file in the directory
        git checkout -b other HEAD^ &&
        echo other >foo/two &&
        git commit -a -m other &&

        # And now we merge. The files in the subdirectory will resolve cleanly,
        # meaning that a combined diff will not find them interesting. But it
        # will find the tree itself interesting, because it had to be merged.
        git checkout master &&
        git merge other &&

        printf "MM\tfoo\n" >expect &&
        git diff-tree -c --name-status -t HEAD >actual.tmp &&
        sed 1d <actual.tmp >actual &&
        test_cmp expect actual
'

test_done