#!/bin/sh
#
# Copyright (c) 2006 Johannes E. Schindelin
#

test_description='git rerere

! [fifth] version1
 ! [first] first
  ! [fourth] version1
   ! [master] initial
    ! [second] prefer first over second
     ! [third] version2
------
     + [third] version2
+      [fifth] version1
  +    [fourth] version1
+ +  + [third^] third
    -  [second] prefer first over second
 +  +  [first] first
    +  [second^] second
++++++ [master] initial
'

. ./test-lib.sh

test_expect_success 'setup' '
        cat >a1 <<-\EOF &&
        Some title
        ==========
        Whether '\''tis nobler in the mind to suffer
        The slings and arrows of outrageous fortune,
        Or to take arms against a sea of troubles,
        And by opposing end them? To die: to sleep;
        No more; and by a sleep to say we end
        The heart-ache and the thousand natural shocks
        That flesh is heir to, '\''tis a consummation
        Devoutly to be wish'\''d.
        EOF

        git add a1 &&
        test_tick &&
        git commit -q -a -m initial &&

        cat >>a1 <<-\EOF &&
        Some title
        ==========
        To die, to sleep;
        To sleep: perchance to dream: ay, there'\''s the rub;
        For in that sleep of death what dreams may come
        When we have shuffled off this mortal coil,
        Must give us pause: there'\''s the respect
        That makes calamity of so long life;
        EOF

        git checkout -b first &&
        test_tick &&
        git commit -q -a -m first &&

        git checkout -b second master &&
        git show first:a1 |
        sed -e "s/To die, t/To die! T/" -e "s/Some title/Some Title/" >a1 &&
        echo "* END *" >>a1 &&
        test_tick &&
        git commit -q -a -m second
'

test_expect_success 'nothing recorded without rerere' '
        rm -rf .git/rr-cache &&
        git config rerere.enabled false &&
        test_must_fail git merge first &&
        ! test -d .git/rr-cache
'

test_expect_success 'activate rerere, old style (conflicting merge)' '
        git reset --hard &&
        mkdir .git/rr-cache &&
        test_might_fail git config --unset rerere.enabled &&
        test_must_fail git merge first &&

        sha1=$(perl -pe "s/     .*//" .git/MERGE_RR) &&
        rr=.git/rr-cache/$sha1 &&
        grep "^=======\$" $rr/preimage &&
        ! test -f $rr/postimage &&
        ! test -f $rr/thisimage
'

test_expect_success 'rerere.enabled works, too' '
        rm -rf .git/rr-cache &&
        git config rerere.enabled true &&
        git reset --hard &&
        test_must_fail git merge first &&

        sha1=$(perl -pe "s/     .*//" .git/MERGE_RR) &&
        rr=.git/rr-cache/$sha1 &&
        grep ^=======$ $rr/preimage
'

test_expect_success 'set up rr-cache' '
        rm -rf .git/rr-cache &&
        git config rerere.enabled true &&
        git reset --hard &&
        test_must_fail git merge first &&
        sha1=$(perl -pe "s/     .*//" .git/MERGE_RR) &&
        rr=.git/rr-cache/$sha1
'

test_expect_success 'rr-cache looks sane' '
        # no postimage or thisimage yet
        ! test -f $rr/postimage &&
        ! test -f $rr/thisimage &&

        # preimage has right number of lines
        cnt=$(sed -ne "/^<<<<<<</,/^>>>>>>>/p" $rr/preimage | wc -l) &&
        echo $cnt &&
        test $cnt = 13
'

test_expect_success 'rerere diff' '
        git show first:a1 >a1 &&
        cat >expect <<-\EOF &&
        --- a/a1
        +++ b/a1
        @@ -1,4 +1,4 @@
        -Some Title
        +Some title
         ==========
         Whether '\''tis nobler in the mind to suffer
         The slings and arrows of outrageous fortune,
        @@ -8,21 +8,11 @@
         The heart-ache and the thousand natural shocks
         That flesh is heir to, '\''tis a consummation
         Devoutly to be wish'\''d.
        -<<<<<<<
        -Some Title
        -==========
        -To die! To sleep;
        -=======
         Some title
         ==========
         To die, to sleep;
        ->>>>>>>
         To sleep: perchance to dream: ay, there'\''s the rub;
         For in that sleep of death what dreams may come
         When we have shuffled off this mortal coil,
         Must give us pause: there'\''s the respect
         That makes calamity of so long life;
        -<<<<<<<
        -=======
        -* END *
        ->>>>>>>
        EOF
        git rerere diff >out &&
        test_cmp expect out
'

test_expect_success 'rerere status' '
        echo a1 >expect &&
        git rerere status >out &&
        test_cmp expect out
'

test_expect_success 'first postimage wins' '
        git show first:a1 | sed "s/To die: t/To die! T/" >expect &&

        git commit -q -a -m "prefer first over second" &&
        test -f $rr/postimage &&

        oldmtimepost=$(test-chmtime -v -60 $rr/postimage | cut -f 1) &&

        git checkout -b third master &&
        git show second^:a1 | sed "s/To die: t/To die! T/" >a1 &&
        git commit -q -a -m third &&

        test_must_fail git merge first &&
        # rerere kicked in
        ! grep "^=======\$" a1 &&
        test_cmp expect a1
'

test_expect_success 'rerere updates postimage timestamp' '
        newmtimepost=$(test-chmtime -v +0 $rr/postimage | cut -f 1) &&
        test $oldmtimepost -lt $newmtimepost
'

test_expect_success 'rerere clear' '
        mv $rr/postimage .git/post-saved &&
        echo "$sha1     a1" | perl -pe "y/\012/\000/" >.git/MERGE_RR &&
        git rerere clear &&
        ! test -d $rr
'

test_expect_success 'leftover directory' '
        git reset --hard &&
        mkdir -p $rr &&
        test_must_fail git merge first &&
        test -f $rr/preimage
'

test_expect_success 'missing preimage' '
        git reset --hard &&
        mkdir -p $rr &&
        cp .git/post-saved $rr/postimage &&
        test_must_fail git merge first &&
        test -f $rr/preimage
'

test_expect_success 'set up for garbage collection tests' '
        mkdir -p $rr &&
        echo Hello >$rr/preimage &&
        echo World >$rr/postimage &&

        sha2=4000000000000000000000000000000000000000 &&
        rr2=.git/rr-cache/$sha2 &&
        mkdir $rr2 &&
        echo Hello >$rr2/preimage &&

        almost_15_days_ago=$((60-15*86400)) &&
        just_over_15_days_ago=$((-1-15*86400)) &&
        almost_60_days_ago=$((60-60*86400)) &&
        just_over_60_days_ago=$((-1-60*86400)) &&

        test-chmtime =$just_over_60_days_ago $rr/preimage &&
        test-chmtime =$almost_60_days_ago $rr/postimage &&
        test-chmtime =$almost_15_days_ago $rr2/preimage
'

test_expect_success 'gc preserves young or recently used records' '
        git rerere gc &&
        test -f $rr/preimage &&
        test -f $rr2/preimage
'

test_expect_success 'old records rest in peace' '
        test-chmtime =$just_over_60_days_ago $rr/postimage &&
        test-chmtime =$just_over_15_days_ago $rr2/preimage &&
        git rerere gc &&
        ! test -f $rr/preimage &&
        ! test -f $rr2/preimage
'

test_expect_success 'setup: file2 added differently in two branches' '
        git reset --hard &&

        git checkout -b fourth &&
        echo Hallo >file2 &&
        git add file2 &&
        test_tick &&
        git commit -m version1 &&

        git checkout third &&
        echo Bello >file2 &&
        git add file2 &&
        test_tick &&
        git commit -m version2 &&

        test_must_fail git merge fourth &&
        echo Cello >file2 &&
        git add file2 &&
        git commit -m resolution
'

test_expect_success 'resolution was recorded properly' '
        echo Cello >expected &&

        git reset --hard HEAD~2 &&
        git checkout -b fifth &&

        echo Hallo >file3 &&
        git add file3 &&
        test_tick &&
        git commit -m version1 &&

        git checkout third &&
        echo Bello >file3 &&
        git add file3 &&
        test_tick &&
        git commit -m version2 &&
        git tag version2 &&

        test_must_fail git merge fifth &&
        test_cmp expected file3 &&
        test_must_fail git update-index --refresh
'

test_expect_success 'rerere.autoupdate' '
        git config rerere.autoupdate true &&
        git reset --hard &&
        git checkout version2 &&
        test_must_fail git merge fifth &&
        git update-index --refresh
'

test_expect_success 'merge --rerere-autoupdate' '
        test_might_fail git config --unset rerere.autoupdate &&
        git reset --hard &&
        git checkout version2 &&
        test_must_fail git merge --rerere-autoupdate fifth &&
        git update-index --refresh
'

test_expect_success 'merge --no-rerere-autoupdate' '
        headblob=$(git rev-parse version2:file3) &&
        mergeblob=$(git rev-parse fifth:file3) &&
        cat >expected <<-EOF &&
        100644 $headblob 2      file3
        100644 $mergeblob 3     file3
        EOF

        git config rerere.autoupdate true &&
        git reset --hard &&
        git checkout version2 &&
        test_must_fail git merge --no-rerere-autoupdate fifth &&
        git ls-files -u >actual &&
        test_cmp expected actual
'

test_expect_success 'set up an unresolved merge' '
        headblob=$(git rev-parse version2:file3) &&
        mergeblob=$(git rev-parse fifth:file3) &&
        cat >expected.unresolved <<-EOF &&
        100644 $headblob 2      file3
        100644 $mergeblob 3     file3
        EOF

        test_might_fail git config --unset rerere.autoupdate &&
        git reset --hard &&
        git checkout version2 &&
        fifth=$(git rev-parse fifth) &&
        echo "$fifth            branch 'fifth' of ." |
        git fmt-merge-msg >msg &&
        ancestor=$(git merge-base version2 fifth) &&
        test_must_fail git merge-recursive "$ancestor" -- HEAD fifth &&

        git ls-files --stage >failedmerge &&
        cp file3 file3.conflict &&

        git ls-files -u >actual &&
        test_cmp expected.unresolved actual
'

test_expect_success 'explicit rerere' '
        test_might_fail git config --unset rerere.autoupdate &&
        git rm -fr --cached . &&
        git update-index --index-info <failedmerge &&
        cp file3.conflict file3 &&
        test_must_fail git update-index --refresh -q &&

        git rerere &&
        git ls-files -u >actual &&
        test_cmp expected.unresolved actual
'

test_expect_success 'explicit rerere with autoupdate' '
        git config rerere.autoupdate true &&
        git rm -fr --cached . &&
        git update-index --index-info <failedmerge &&
        cp file3.conflict file3 &&
        test_must_fail git update-index --refresh -q &&

        git rerere &&
        git update-index --refresh
'

test_expect_success 'explicit rerere --rerere-autoupdate overrides' '
        git config rerere.autoupdate false &&
        git rm -fr --cached . &&
        git update-index --index-info <failedmerge &&
        cp file3.conflict file3 &&
        git rerere &&
        git ls-files -u >actual1 &&

        git rm -fr --cached . &&
        git update-index --index-info <failedmerge &&
        cp file3.conflict file3 &&
        git rerere --rerere-autoupdate &&
        git update-index --refresh &&

        git rm -fr --cached . &&
        git update-index --index-info <failedmerge &&
        cp file3.conflict file3 &&
        git rerere --rerere-autoupdate --no-rerere-autoupdate &&
        git ls-files -u >actual2 &&

        git rm -fr --cached . &&
        git update-index --index-info <failedmerge &&
        cp file3.conflict file3 &&
        git rerere --rerere-autoupdate --no-rerere-autoupdate --rerere-autoupdate &&
        git update-index --refresh &&

        test_cmp expected.unresolved actual1 &&
        test_cmp expected.unresolved actual2
'

test_expect_success 'rerere --no-no-rerere-autoupdate' '
        git rm -fr --cached . &&
        git update-index --index-info <failedmerge &&
        cp file3.conflict file3 &&
        test_must_fail git rerere --no-no-rerere-autoupdate 2>err &&
        test_i18ngrep [Uu]sage err &&
        test_must_fail git update-index --refresh
'

test_expect_success 'rerere -h' '
        test_must_fail git rerere -h >help &&
        test_i18ngrep [Uu]sage help
'

concat_insert () {
        last=$1
        shift
        cat early && printf "%s\n" "$@" && cat late "$last"
}

count_pre_post () {
        find .git/rr-cache/ -type f -name "preimage*" >actual &&
        test_line_count = "$1" actual &&
        find .git/rr-cache/ -type f -name "postimage*" >actual &&
        test_line_count = "$2" actual
}

test_expect_success 'rerere gc' '
        find .git/rr-cache -type f >original &&
        xargs test-chmtime -172800 <original &&

        git -c gc.rerereresolved=5 -c gc.rerereunresolved=5 rerere gc &&
        find .git/rr-cache -type f >actual &&
        test_cmp original actual &&

        git -c gc.rerereresolved=5 -c gc.rerereunresolved=0 rerere gc &&
        find .git/rr-cache -type f >actual &&
        test_cmp original actual &&

        git -c gc.rerereresolved=0 -c gc.rerereunresolved=0 rerere gc &&
        find .git/rr-cache -type f >actual &&
        >expect &&
        test_cmp expect actual
'

merge_conflict_resolve () {
        git reset --hard &&
        test_must_fail git merge six.1 &&
        # Resolution is to replace 7 with 6.1 and 6.2 (i.e. take both)
        concat_insert short 6.1 6.2 >file1 &&
        concat_insert long 6.1 6.2 >file2
}

test_expect_success 'multiple identical conflicts' '
        git reset --hard &&

        test_seq 1 6 >early &&
        >late &&
        test_seq 11 15 >short &&
        test_seq 111 120 >long &&
        concat_insert short >file1 &&
        concat_insert long >file2 &&
        git add file1 file2 &&
        git commit -m base &&
        git tag base &&
        git checkout -b six.1 &&
        concat_insert short 6.1 >file1 &&
        concat_insert long 6.1 >file2 &&
        git add file1 file2 &&
        git commit -m 6.1 &&
        git checkout -b six.2 HEAD^ &&
        concat_insert short 6.2 >file1 &&
        concat_insert long 6.2 >file2 &&
        git add file1 file2 &&
        git commit -m 6.2 &&

        # At this point, six.1 and six.2
        # - derive from common ancestor that has two files
        #   1...6 7 11..15 (file1) and 1...6 7 111..120 (file2)
        # - six.1 replaces these 7s with 6.1
        # - six.2 replaces these 7s with 6.2

        merge_conflict_resolve &&

        # Check that rerere knows that file1 and file2 have conflicts

        printf "%s\n" file1 file2 >expect &&
        git ls-files -u | sed -e "s/^.* //" | sort -u >actual &&
        test_cmp expect actual &&

        git rerere status | sort >actual &&
        test_cmp expect actual &&

        git rerere remaining >actual &&
        test_cmp expect actual &&

        count_pre_post 2 0 &&

        # Pretend that the conflicts were made quite some time ago
        find .git/rr-cache/ -type f | xargs test-chmtime -172800 &&

        # Unresolved entries have not expired yet
        git -c gc.rerereresolved=5 -c gc.rerereunresolved=5 rerere gc &&
        count_pre_post 2 0 &&

        # Unresolved entries have expired
        git -c gc.rerereresolved=5 -c gc.rerereunresolved=1 rerere gc &&
        count_pre_post 0 0 &&

        # Recreate the conflicted state
        merge_conflict_resolve &&
        count_pre_post 2 0 &&

        # Clear it
        git rerere clear &&
        count_pre_post 0 0 &&

        # Recreate the conflicted state
        merge_conflict_resolve &&
        count_pre_post 2 0 &&

        # We resolved file1 and file2
        git rerere &&
        >expect &&
        git rerere remaining >actual &&
        test_cmp expect actual &&

        # We must have recorded both of them
        count_pre_post 2 2 &&

        # Now we should be able to resolve them both
        git reset --hard &&
        test_must_fail git merge six.1 &&
        git rerere &&

        >expect &&
        git rerere remaining >actual &&
        test_cmp expect actual &&

        concat_insert short 6.1 6.2 >file1.expect &&
        concat_insert long 6.1 6.2 >file2.expect &&
        test_cmp file1.expect file1 &&
        test_cmp file2.expect file2 &&

        # Forget resolution for file2
        git rerere forget file2 &&
        echo file2 >expect &&
        git rerere status >actual &&
        test_cmp expect actual &&
        count_pre_post 2 1 &&

        # file2 already has correct resolution, so record it again
        git rerere &&

        # Pretend that the resolutions are old again
        find .git/rr-cache/ -type f | xargs test-chmtime -172800 &&

        # Resolved entries have not expired yet
        git -c gc.rerereresolved=5 -c gc.rerereunresolved=5 rerere gc &&

        count_pre_post 2 2 &&

        # Resolved entries have expired
        git -c gc.rerereresolved=1 -c gc.rerereunresolved=5 rerere gc &&
        count_pre_post 0 0
'

test_done