#!/bin/sh

test_description='rewrite diff'

. ./test-lib.sh

test_expect_success setup '

        cat "$TEST_DIRECTORY"/../COPYING >test &&
        git add test &&
        tr \
          "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" \
          "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM" \
          <"$TEST_DIRECTORY"/../COPYING >test &&
        echo "to be deleted" >test2 &&
        blob=$(git hash-object test2) &&
        blob=$(git rev-parse --short $blob) &&
        git add test2

'

test_expect_success 'detect rewrite' '

        actual=$(git diff-files -B --summary test) &&
        verbose expr "$actual" : " rewrite test ([0-9]*%)$"

'

cat >expect <<EOF
diff --git a/test2 b/test2
deleted file mode 100644
index $blob..0000000
--- a/test2
+++ /dev/null
@@ -1 +0,0 @@
-to be deleted
EOF
test_expect_success 'show deletion diff without -D' '

        rm test2 &&
        git diff -- test2 >actual &&
        test_cmp expect actual
'

cat >expect <<EOF
diff --git a/test2 b/test2
deleted file mode 100644
index $blob..0000000
EOF
test_expect_success 'suppress deletion diff with -D' '

        git diff -D -- test2 >actual &&
        test_cmp expect actual
'

test_expect_success 'show deletion diff with -B' '

        git diff -B -- test >actual &&
        grep "Linus Torvalds" actual
'

test_expect_success 'suppress deletion diff with -B -D' '

        git diff -B -D -- test >actual &&
        grep -v "Linus Torvalds" actual
'

test_expect_success 'prepare a file that ends with an incomplete line' '
        test_seq 1 99 >seq &&
        printf 100 >>seq &&
        git add seq &&
        git commit seq -m seq
'

test_expect_success 'rewrite the middle 90% of sequence file and terminate with newline' '
        test_seq 1 5 >seq &&
        test_seq 9331 9420 >>seq &&
        test_seq 96 100 >>seq
'

test_expect_success 'confirm that sequence file is considered a rewrite' '
        git diff -B seq >res &&
        grep "dissimilarity index" res
'

test_expect_success 'no newline at eof is on its own line without -B' '
        git diff seq >res &&
        grep "^\\\\ " res &&
        ! grep "^..*\\\\ " res
'

test_expect_success 'no newline at eof is on its own line with -B' '
        git diff -B seq >res &&
        grep "^\\\\ " res &&
        ! grep "^..*\\\\ " res
'

test_done