#!/bin/sh
#
# Copyright (c) 2007 Carlos Rica
#

test_description='git reset

Documented tests for git reset'

. ./test-lib.sh

commit_msg () {
        # String "modify 2nd file (changed)" partly in German
        # (translated with Google Translate),
        # encoded in UTF-8, used as a commit log message below.
        msg="modify 2nd file (ge\303\244ndert)\n"
        if test -n "$1"
        then
                printf "$msg" | iconv -f utf-8 -t "$1"
        else
                printf "$msg"
        fi
}

test_expect_success 'creating initial files and commits' '
        test_tick &&
        echo "1st file" >first &&
        git add first &&
        git commit -m "create 1st file" &&

        echo "2nd file" >second &&
        git add second &&
        git commit -m "create 2nd file" &&

        echo "2nd line 1st file" >>first &&
        git commit -a -m "modify 1st file" &&

        git rm first &&
        git mv second secondfile &&
        git commit -a -m "remove 1st and rename 2nd" &&

        echo "1st line 2nd file" >secondfile &&
        echo "2nd line 2nd file" >>secondfile &&
        git -c "i18n.commitEncoding=iso8859-1" commit -a -m "$(commit_msg iso8859-1)" &&
        head5=$(git rev-parse --verify HEAD)
'
# git log --pretty=oneline # to see those SHA1 involved

check_changes () {
        test "$(git rev-parse HEAD)" = "$1" &&
        git diff | test_cmp .diff_expect - &&
        git diff --cached | test_cmp .cached_expect - &&
        for FILE in *
        do
                echo $FILE':'
                cat $FILE || return
        done | test_cmp .cat_expect -
}

test_expect_success 'reset --hard message' '
        hex=$(git log -1 --format="%h") &&
        git reset --hard > .actual &&
        echo HEAD is now at $hex $(commit_msg) > .expected &&
        test_cmp .expected .actual
'

test_expect_success 'reset --hard message (iso8859-1 logoutputencoding)' '
        hex=$(git log -1 --format="%h") &&
        git -c "i18n.logOutputEncoding=iso8859-1" reset --hard > .actual &&
        echo HEAD is now at $hex $(commit_msg iso8859-1) > .expected &&
        test_cmp .expected .actual
'

>.diff_expect
>.cached_expect
cat >.cat_expect <<EOF
secondfile:
1st line 2nd file
2nd line 2nd file
EOF

test_expect_success 'giving a non existing revision should fail' '
        test_must_fail git reset aaaaaa &&
        test_must_fail git reset --mixed aaaaaa &&
        test_must_fail git reset --soft aaaaaa &&
        test_must_fail git reset --hard aaaaaa &&
        check_changes $head5
'

test_expect_success 'reset --soft with unmerged index should fail' '
        touch .git/MERGE_HEAD &&
        echo "100644 44c5b5884550c17758737edcced463447b91d42b 1 un" |
                git update-index --index-info &&
        test_must_fail git reset --soft HEAD &&
        rm .git/MERGE_HEAD &&
        git rm --cached -- un
'

test_expect_success \
        'giving paths with options different than --mixed should fail' '
        test_must_fail git reset --soft -- first &&
        test_must_fail git reset --hard -- first &&
        test_must_fail git reset --soft HEAD^ -- first &&
        test_must_fail git reset --hard HEAD^ -- first &&
        check_changes $head5
'

test_expect_success 'giving unrecognized options should fail' '
        test_must_fail git reset --other &&
        test_must_fail git reset -o &&
        test_must_fail git reset --mixed --other &&
        test_must_fail git reset --mixed -o &&
        test_must_fail git reset --soft --other &&
        test_must_fail git reset --soft -o &&
        test_must_fail git reset --hard --other &&
        test_must_fail git reset --hard -o &&
        check_changes $head5
'

test_expect_success \
        'trying to do reset --soft with pending merge should fail' '
        git branch branch1 &&
        git branch branch2 &&

        git checkout branch1 &&
        echo "3rd line in branch1" >>secondfile &&
        git commit -a -m "change in branch1" &&

        git checkout branch2 &&
        echo "3rd line in branch2" >>secondfile &&
        git commit -a -m "change in branch2" &&

        test_must_fail git merge branch1 &&
        test_must_fail git reset --soft &&

        printf "1st line 2nd file\n2nd line 2nd file\n3rd line" >secondfile &&
        git commit -a -m "the change in branch2" &&

        git checkout master &&
        git branch -D branch1 branch2 &&
        check_changes $head5
'

test_expect_success \
        'trying to do reset --soft with pending checkout merge should fail' '
        git branch branch3 &&
        git branch branch4 &&

        git checkout branch3 &&
        echo "3rd line in branch3" >>secondfile &&
        git commit -a -m "line in branch3" &&

        git checkout branch4 &&
        echo "3rd line in branch4" >>secondfile &&

        git checkout -m branch3 &&
        test_must_fail git reset --soft &&

        printf "1st line 2nd file\n2nd line 2nd file\n3rd line" >secondfile &&
        git commit -a -m "the line in branch3" &&

        git checkout master &&
        git branch -D branch3 branch4 &&
        check_changes $head5
'

test_expect_success \
        'resetting to HEAD with no changes should succeed and do nothing' '
        git reset --hard &&
                check_changes $head5 &&
        git reset --hard HEAD &&
                check_changes $head5 &&
        git reset --soft &&
                check_changes $head5 &&
        git reset --soft HEAD &&
                check_changes $head5 &&
        git reset --mixed &&
                check_changes $head5 &&
        git reset --mixed HEAD &&
                check_changes $head5 &&
        git reset &&
                check_changes $head5 &&
        git reset HEAD &&
                check_changes $head5
'

>.diff_expect
cat >.cached_expect <<EOF
diff --git a/secondfile b/secondfile
index 1bbba79..44c5b58 100644
--- a/secondfile
+++ b/secondfile
@@ -1 +1,2 @@
-2nd file
+1st line 2nd file
+2nd line 2nd file
EOF
cat >.cat_expect <<EOF
secondfile:
1st line 2nd file
2nd line 2nd file
EOF
test_expect_success '--soft reset only should show changes in diff --cached' '
        git reset --soft HEAD^ &&
        check_changes d1a4bc3abce4829628ae2dcb0d60ef3d1a78b1c4 &&
        test "$(git rev-parse ORIG_HEAD)" = \
                        $head5
'

>.diff_expect
>.cached_expect
cat >.cat_expect <<EOF
secondfile:
1st line 2nd file
2nd line 2nd file
3rd line 2nd file
EOF
test_expect_success \
        'changing files and redo the last commit should succeed' '
        echo "3rd line 2nd file" >>secondfile &&
        git commit -a -C ORIG_HEAD &&
        head4=$(git rev-parse --verify HEAD) &&
        check_changes $head4 &&
        test "$(git rev-parse ORIG_HEAD)" = \
                        $head5
'

>.diff_expect
>.cached_expect
cat >.cat_expect <<EOF
first:
1st file
2nd line 1st file
second:
2nd file
EOF
test_expect_success \
        '--hard reset should change the files and undo commits permanently' '
        git reset --hard HEAD~2 &&
        check_changes ddaefe00f1da16864591c61fdc7adb5d7cd6b74e &&
        test "$(git rev-parse ORIG_HEAD)" = \
                        $head4
'

>.diff_expect
cat >.cached_expect <<EOF
diff --git a/first b/first
deleted file mode 100644
index 8206c22..0000000
--- a/first
+++ /dev/null
@@ -1,2 +0,0 @@
-1st file
-2nd line 1st file
diff --git a/second b/second
deleted file mode 100644
index 1bbba79..0000000
--- a/second
+++ /dev/null
@@ -1 +0,0 @@
-2nd file
diff --git a/secondfile b/secondfile
new file mode 100644
index 0000000..44c5b58
--- /dev/null
+++ b/secondfile
@@ -0,0 +1,2 @@
+1st line 2nd file
+2nd line 2nd file
EOF
cat >.cat_expect <<EOF
secondfile:
1st line 2nd file
2nd line 2nd file
EOF
test_expect_success \
        'redoing changes adding them without commit them should succeed' '
        git rm first &&
        git mv second secondfile &&

        echo "1st line 2nd file" >secondfile &&
        echo "2nd line 2nd file" >>secondfile &&
        git add secondfile &&
        check_changes ddaefe00f1da16864591c61fdc7adb5d7cd6b74e
'

cat >.diff_expect <<EOF
diff --git a/first b/first
deleted file mode 100644
index 8206c22..0000000
--- a/first
+++ /dev/null
@@ -1,2 +0,0 @@
-1st file
-2nd line 1st file
diff --git a/second b/second
deleted file mode 100644
index 1bbba79..0000000
--- a/second
+++ /dev/null
@@ -1 +0,0 @@
-2nd file
EOF
>.cached_expect
cat >.cat_expect <<EOF
secondfile:
1st line 2nd file
2nd line 2nd file
EOF
test_expect_success '--mixed reset to HEAD should unadd the files' '
        git reset &&
        check_changes ddaefe00f1da16864591c61fdc7adb5d7cd6b74e &&
        test "$(git rev-parse ORIG_HEAD)" = \
                        ddaefe00f1da16864591c61fdc7adb5d7cd6b74e
'

>.diff_expect
>.cached_expect
cat >.cat_expect <<EOF
secondfile:
1st line 2nd file
2nd line 2nd file
EOF
test_expect_success 'redoing the last two commits should succeed' '
        git add secondfile &&
        git reset --hard ddaefe00f1da16864591c61fdc7adb5d7cd6b74e &&

        git rm first &&
        git mv second secondfile &&
        git commit -a -m "remove 1st and rename 2nd" &&

        echo "1st line 2nd file" >secondfile &&
        echo "2nd line 2nd file" >>secondfile &&
        git -c "i18n.commitEncoding=iso8859-1" commit -a -m "$(commit_msg iso8859-1)" &&
        check_changes $head5
'

>.diff_expect
>.cached_expect
cat >.cat_expect <<EOF
secondfile:
1st line 2nd file
2nd line 2nd file
3rd line in branch2
EOF
test_expect_success '--hard reset to HEAD should clear a failed merge' '
        git branch branch1 &&
        git branch branch2 &&

        git checkout branch1 &&
        echo "3rd line in branch1" >>secondfile &&
        git commit -a -m "change in branch1" &&

        git checkout branch2 &&
        echo "3rd line in branch2" >>secondfile &&
        git commit -a -m "change in branch2" &&
        head3=$(git rev-parse --verify HEAD) &&

        test_must_fail git pull . branch1 &&
        git reset --hard &&
        check_changes $head3
'

>.diff_expect
>.cached_expect
cat >.cat_expect <<EOF
secondfile:
1st line 2nd file
2nd line 2nd file
EOF
test_expect_success \
        '--hard reset to ORIG_HEAD should clear a fast-forward merge' '
        git reset --hard HEAD^ &&
        check_changes $head5 &&

        git pull . branch1 &&
        git reset --hard ORIG_HEAD &&
        check_changes $head5 &&

        git checkout master &&
        git branch -D branch1 branch2 &&
        check_changes $head5
'

cat > expect << EOF
diff --git a/file1 b/file1
index d00491f..7ed6ff8 100644
--- a/file1
+++ b/file1
@@ -1 +1 @@
-1
+5
diff --git a/file2 b/file2
deleted file mode 100644
index 0cfbf08..0000000
--- a/file2
+++ /dev/null
@@ -1 +0,0 @@
-2
EOF
cat > cached_expect << EOF
diff --git a/file4 b/file4
new file mode 100644
index 0000000..b8626c4
--- /dev/null
+++ b/file4
@@ -0,0 +1 @@
+4
EOF
test_expect_success 'test --mixed <paths>' '
        echo 1 > file1 &&
        echo 2 > file2 &&
        git add file1 file2 &&
        test_tick &&
        git commit -m files &&
        git rm file2 &&
        echo 3 > file3 &&
        echo 4 > file4 &&
        echo 5 > file1 &&
        git add file1 file3 file4 &&
        git reset HEAD -- file1 file2 file3 &&
        test_must_fail git diff --quiet &&
        git diff > output &&
        test_cmp output expect &&
        git diff --cached > output &&
        test_cmp output cached_expect
'

test_expect_success 'test resetting the index at give paths' '

        mkdir sub &&
        >sub/file1 &&
        >sub/file2 &&
        git update-index --add sub/file1 sub/file2 &&
        T=$(git write-tree) &&
        git reset HEAD sub/file2 &&
        test_must_fail git diff --quiet &&
        U=$(git write-tree) &&
        echo "$T" &&
        echo "$U" &&
        test_must_fail git diff-index --cached --exit-code "$T" &&
        test "$T" != "$U"

'

test_expect_success 'resetting an unmodified path is a no-op' '
        git reset --hard &&
        git reset -- file1 &&
        git diff-files --exit-code &&
        git diff-index --cached --exit-code HEAD
'

cat > expect << EOF
Unstaged changes after reset:
M       file2
EOF

test_expect_success '--mixed refreshes the index' '
        echo 123 >> file2 &&
        git reset --mixed HEAD > output &&
        test_i18ncmp expect output
'

test_expect_success 'resetting specific path that is unmerged' '
        git rm --cached file2 &&
        F1=$(git rev-parse HEAD:file1) &&
        F2=$(git rev-parse HEAD:file2) &&
        F3=$(git rev-parse HEAD:secondfile) &&
        {
                echo "100644 $F1 1      file2" &&
                echo "100644 $F2 2      file2" &&
                echo "100644 $F3 3      file2"
        } | git update-index --index-info &&
        git ls-files -u &&
        git reset HEAD file2 &&
        test_must_fail git diff --quiet &&
        git diff-index --exit-code --cached HEAD
'

test_expect_success 'disambiguation (1)' '

        git reset --hard &&
        >secondfile &&
        git add secondfile &&
        git reset secondfile &&
        test_must_fail git diff --quiet -- secondfile &&
        test -z "$(git diff --cached --name-only)" &&
        test -f secondfile &&
        test_must_be_empty secondfile

'

test_expect_success 'disambiguation (2)' '

        git reset --hard &&
        >secondfile &&
        git add secondfile &&
        rm -f secondfile &&
        test_must_fail git reset secondfile &&
        test -n "$(git diff --cached --name-only -- secondfile)" &&
        test ! -f secondfile

'

test_expect_success 'disambiguation (3)' '

        git reset --hard &&
        >secondfile &&
        git add secondfile &&
        rm -f secondfile &&
        git reset HEAD secondfile &&
        test_must_fail git diff --quiet &&
        test -z "$(git diff --cached --name-only)" &&
        test ! -f secondfile

'

test_expect_success 'disambiguation (4)' '

        git reset --hard &&
        >secondfile &&
        git add secondfile &&
        rm -f secondfile &&
        git reset -- secondfile &&
        test_must_fail git diff --quiet &&
        test -z "$(git diff --cached --name-only)" &&
        test ! -f secondfile
'

test_expect_success 'reset with paths accepts tree' '
        # for simpler tests, drop last commit containing added files
        git reset --hard HEAD^ &&
        git reset HEAD^^{tree} -- . &&
        git diff --cached HEAD^ --exit-code &&
        git diff HEAD --exit-code
'

test_done