#!/bin/sh

test_description='exercise basic bitmap functionality'
. ./test-lib.sh

objpath () {
        echo ".git/objects/$(echo "$1" | sed -e 's|\(..\)|\1/|')"
}

test_expect_success 'setup repo with moderate-sized history' '
        for i in $(test_seq 1 10); do
                test_commit $i
        done &&
        git checkout -b other HEAD~5 &&
        for i in $(test_seq 1 10); do
                test_commit side-$i
        done &&
        git checkout master &&
        blob=$(echo tagged-blob | git hash-object -w --stdin) &&
        git tag tagged-blob $blob &&
        git config repack.writebitmaps true &&
        git config pack.writebitmaphashcache true
'

test_expect_success 'full repack creates bitmaps' '
        git repack -ad &&
        ls .git/objects/pack/ | grep bitmap >output &&
        test_line_count = 1 output
'

test_expect_success 'rev-list --test-bitmap verifies bitmaps' '
        git rev-list --test-bitmap HEAD
'

rev_list_tests() {
        state=$1

        test_expect_success "counting commits via bitmap ($state)" '
                git rev-list --count HEAD >expect &&
                git rev-list --use-bitmap-index --count HEAD >actual &&
                test_cmp expect actual
        '

        test_expect_success "counting partial commits via bitmap ($state)" '
                git rev-list --count HEAD~5..HEAD >expect &&
                git rev-list --use-bitmap-index --count HEAD~5..HEAD >actual &&
                test_cmp expect actual
        '

        test_expect_success "counting non-linear history ($state)" '
                git rev-list --count other...master >expect &&
                git rev-list --use-bitmap-index --count other...master >actual &&
                test_cmp expect actual
        '

        test_expect_success "enumerate --objects ($state)" '
                git rev-list --objects --use-bitmap-index HEAD >tmp &&
                cut -d" " -f1 <tmp >tmp2 &&
                sort <tmp2 >actual &&
                git rev-list --objects HEAD >tmp &&
                cut -d" " -f1 <tmp >tmp2 &&
                sort <tmp2 >expect &&
                test_cmp expect actual
        '

        test_expect_success "bitmap --objects handles non-commit objects ($state)" '
                git rev-list --objects --use-bitmap-index HEAD tagged-blob >actual &&
                grep $blob actual
        '
}

rev_list_tests 'full bitmap'

test_expect_success 'clone from bitmapped repository' '
        git clone --no-local --bare . clone.git &&
        git rev-parse HEAD >expect &&
        git --git-dir=clone.git rev-parse HEAD >actual &&
        test_cmp expect actual
'

test_expect_success 'setup further non-bitmapped commits' '
        for i in $(test_seq 1 10); do
                test_commit further-$i
        done
'

rev_list_tests 'partial bitmap'

test_expect_success 'fetch (partial bitmap)' '
        git --git-dir=clone.git fetch origin master:master &&
        git rev-parse HEAD >expect &&
        git --git-dir=clone.git rev-parse HEAD >actual &&
        test_cmp expect actual
'

test_expect_success 'incremental repack cannot create bitmaps' '
        test_commit more-1 &&
        find .git/objects/pack -name "*.bitmap" >expect &&
        git repack -d &&
        find .git/objects/pack -name "*.bitmap" >actual &&
        test_cmp expect actual
'

test_expect_success 'incremental repack can disable bitmaps' '
        test_commit more-2 &&
        git repack -d --no-write-bitmap-index
'

test_expect_success 'full repack, reusing previous bitmaps' '
        git repack -ad &&
        ls .git/objects/pack/ | grep bitmap >output &&
        test_line_count = 1 output
'

test_expect_success 'fetch (full bitmap)' '
        git --git-dir=clone.git fetch origin master:master &&
        git rev-parse HEAD >expect &&
        git --git-dir=clone.git rev-parse HEAD >actual &&
        test_cmp expect actual
'

test_expect_success 'create objects for missing-HAVE tests' '
        blob=$(echo "missing have" | git hash-object -w --stdin) &&
        tree=$(printf "100644 blob $blob\tfile\n" | git mktree) &&
        parent=$(echo parent | git commit-tree $tree) &&
        commit=$(echo commit | git commit-tree $tree -p $parent) &&
        cat >revs <<-EOF
        HEAD
        ^HEAD^
        ^$commit
        EOF
'

test_expect_success 'pack with missing blob' '
        rm $(objpath $blob) &&
        git pack-objects --stdout --revs <revs >/dev/null
'

test_expect_success 'pack with missing tree' '
        rm $(objpath $tree) &&
        git pack-objects --stdout --revs <revs >/dev/null
'

test_expect_success 'pack with missing parent' '
        rm $(objpath $parent) &&
        git pack-objects --stdout --revs <revs >/dev/null
'

test_lazy_prereq JGIT '
        type jgit
'

test_expect_success JGIT 'we can read jgit bitmaps' '
        git clone . compat-jgit &&
        (
                cd compat-jgit &&
                rm -f .git/objects/pack/*.bitmap &&
                jgit gc &&
                git rev-list --test-bitmap HEAD
        )
'

test_expect_success JGIT 'jgit can read our bitmaps' '
        git clone . compat-us &&
        (
                cd compat-us &&
                git repack -adb &&
                # jgit gc will barf if it does not like our bitmaps
                jgit gc
        )
'

test_done