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2e2d5ac184
git/t/t4015-diff-whitespace.sh
Stefan Beller 2e2d5ac184 diff.c: color moved lines differently 
When a patch consists mostly of moving blocks of code around, it can
be quite tedious to ensure that the blocks are moved verbatim, and not
undesirably modified in the move. To that end, color blocks that are
moved within the same patch differently. For example (OM, del, add,
and NM are different colors):

    [OM]  -void sensitive_stuff(void)
    [OM]  -{
    [OM]  -        if (!is_authorized_user())
    [OM]  -                die("unauthorized");
    [OM]  -        sensitive_stuff(spanning,
    [OM]  -                        multiple,
    [OM]  -                        lines);
    [OM]  -}

           void another_function()
           {
    [del] -        printf("foo");
    [add] +        printf("bar");
           }

    [NM]  +void sensitive_stuff(void)
    [NM]  +{
    [NM]  +        if (!is_authorized_user())
    [NM]  +                die("unauthorized");
    [NM]  +        sensitive_stuff(spanning,
    [NM]  +                        multiple,
    [NM]  +                        lines);
    [NM]  +}

However adjacent blocks may be problematic. For example, in this
potentially malicious patch, the swapping of blocks can be spotted:

    [OM]  -void sensitive_stuff(void)
    [OM]  -{
    [OMA] -        if (!is_authorized_user())
    [OMA] -                die("unauthorized");
    [OM]  -        sensitive_stuff(spanning,
    [OM]  -                        multiple,
    [OM]  -                        lines);
    [OMA] -}

           void another_function()
           {
    [del] -        printf("foo");
    [add] +        printf("bar");
           }

    [NM]  +void sensitive_stuff(void)
    [NM]  +{
    [NMA] +        sensitive_stuff(spanning,
    [NMA] +                        multiple,
    [NMA] +                        lines);
    [NM]  +        if (!is_authorized_user())
    [NM]  +                die("unauthorized");
    [NMA] +}

If the moved code is larger, it is easier to hide some permutation in the
code, which is why some alternative coloring is needed.

This patch implements the first mode:
* basic alternating 'Zebra' mode
  This conveys all information needed to the user.  Defer customization to
  later patches.

First I implemented an alternative design, which would try to fingerprint
a line by its neighbors to detect if we are in a block or at the boundary.
This idea iss error prone as it inspected each line and its neighboring
lines to determine if the line was (a) moved and (b) if was deep inside
a hunk by having matching neighboring lines. This is unreliable as the
we can construct hunks which have equal neighbors that just exceed the
number of lines inspected. (Think of 'AXYZBXYZCXYZD..' with each letter
as a line, that is permutated to AXYZCXYZBXYZD..').

Instead this provides a dynamic programming greedy algorithm that finds
the largest moved hunk and then has several modes on highlighting bounds.

A note on the options '--submodule=diff' and '--color-words/--word-diff':
In the conversion to use emit_line in the prior patches both submodules
as well as word diff output carefully chose to call emit_line with sign=0.
All output with sign=0 is ignored for move detection purposes in this
patch, such that no weird looking output will be generated for these
cases. This leads to another thought: We could pass on '--color-moved' to
submodules such that they color up moved lines for themselves. If we'd do
so only line moves within a repository boundary are marked up.

It is useful to have moved lines colored, but there are annoying corner
cases, such as a single line moved, that is very common. For example
in a typical patch of C code, we have closing braces that end statement
blocks or functions.

While it is technically true that these lines are moved as they show up
elsewhere, it is harmful for the review as the reviewers attention is
drawn to such a minor side annoyance.

For now let's have a simple solution of hardcoding the number of
moved lines to be at least 3 before coloring them. Note, that the
length is applied across all blocks to find the 'lonely' blocks
that pollute new code, but do not interfere with a permutated
block where each permutation has less lines than 3.

Helped-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-06-30 13:59:42 -07:00

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#!/bin/sh
#
# Copyright (c) 2006 Johannes E. Schindelin
#
test_description='Test special whitespace in diff engine.
'
. ./test-lib.sh
. "$TEST_DIRECTORY"/diff-lib.sh
test_expect_success "Ray Lehtiniemi's example" '
cat <<-\EOF >x &&
do {
nothing;
} while (0);
EOF
git update-index --add x &&
cat <<-\EOF >x &&
do
{
nothing;
}
while (0);
EOF
cat <<-\EOF >expect &&
diff --git a/x b/x
index adf3937..6edc172 100644
--- a/x
+++ b/x
@@ -1,3 +1,5 @@
-do {
+do
+{
nothing;
-} while (0);
+}
+while (0);
EOF
git diff >out &&
test_cmp expect out &&
git diff -w >out &&
test_cmp expect out &&
git diff -b >out &&
test_cmp expect out
'
test_expect_success 'another test, without options' '
tr Q "\015" <<-\EOF >x &&
whitespace at beginning
whitespace change
whitespace in the middle
whitespace at end
unchanged line
CR at endQ
EOF
git update-index x &&
tr "_" " " <<-\EOF >x &&
_ whitespace at beginning
whitespace change
white space in the middle
whitespace at end__
unchanged line
CR at end
EOF
tr "Q_" "\015 " <<-\EOF >expect &&
diff --git a/x b/x
index d99af23..22d9f73 100644
--- a/x
+++ b/x
@@ -1,6 +1,6 @@
-whitespace at beginning
-whitespace change
-whitespace in the middle
-whitespace at end
+ whitespace at beginning
+whitespace change
+white space in the middle
+whitespace at end__
unchanged line
-CR at endQ
+CR at end
EOF
git diff >out &&
test_cmp expect out &&
>expect &&
git diff -w >out &&
test_cmp expect out &&
git diff -w -b >out &&
test_cmp expect out &&
git diff -w --ignore-space-at-eol >out &&
test_cmp expect out &&
git diff -w -b --ignore-space-at-eol >out &&
test_cmp expect out &&
tr "Q_" "\015 " <<-\EOF >expect &&
diff --git a/x b/x
index d99af23..22d9f73 100644
--- a/x
+++ b/x
@@ -1,6 +1,6 @@
-whitespace at beginning
+_ whitespace at beginning
whitespace change
-whitespace in the middle
+white space in the middle
whitespace at end__
unchanged line
CR at end
EOF
git diff -b >out &&
test_cmp expect out &&
git diff -b --ignore-space-at-eol >out &&
test_cmp expect out &&
tr "Q_" "\015 " <<-\EOF >expect &&
diff --git a/x b/x
index d99af23..22d9f73 100644
--- a/x
+++ b/x
@@ -1,6 +1,6 @@
-whitespace at beginning
-whitespace change
-whitespace in the middle
+_ whitespace at beginning
+whitespace change
+white space in the middle
whitespace at end__
unchanged line
CR at end
EOF
git diff --ignore-space-at-eol >out &&
test_cmp expect out
'
test_expect_success 'ignore-blank-lines: only new lines' '
test_seq 5 >x &&
git update-index x &&
test_seq 5 | sed "/3/i\\
" >x &&
git diff --ignore-blank-lines >out &&
>expect &&
test_cmp out expect
'
test_expect_success 'ignore-blank-lines: only new lines with space' '
test_seq 5 >x &&
git update-index x &&
test_seq 5 | sed "/3/i\\
" >x &&
git diff -w --ignore-blank-lines >out &&
>expect &&
test_cmp out expect
'
test_expect_success 'ignore-blank-lines: after change' '
cat <<-\EOF >x &&
1
2
3
4
5
6
7
EOF
git update-index x &&
cat <<-\EOF >x &&
change
1
2
3
4
5
6
7
EOF
git diff --inter-hunk-context=100 --ignore-blank-lines >out.tmp &&
cat <<-\EOF >expected &&
diff --git a/x b/x
--- a/x
+++ b/x
@@ -1,6 +1,7 @@
+change
+
1
2
-
3
4
5
EOF
compare_diff_patch expected out.tmp
'
test_expect_success 'ignore-blank-lines: before change' '
cat <<-\EOF >x &&
1
2
3
4
5
6
7
EOF
git update-index x &&
cat <<-\EOF >x &&
1
2
3
4
5
6
7
change
EOF
git diff --inter-hunk-context=100 --ignore-blank-lines >out.tmp &&
cat <<-\EOF >expected &&
diff --git a/x b/x
--- a/x
+++ b/x
@@ -4,5 +4,7 @@
3
4
5
+
6
7
+change
EOF
compare_diff_patch expected out.tmp
'
test_expect_success 'ignore-blank-lines: between changes' '
cat <<-\EOF >x &&
1
2
3
4
5
6
7
8
9
10
EOF
git update-index x &&
cat <<-\EOF >x &&
change
1
2
3
4
5
6
7
8
9
10
change
EOF
git diff --ignore-blank-lines >out.tmp &&
cat <<-\EOF >expected &&
diff --git a/x b/x
--- a/x
+++ b/x
@@ -1,5 +1,7 @@
+change
1
2
+
3
4
5
@@ -8,5 +8,7 @@
6
7
8
+
9
10
+change
EOF
compare_diff_patch expected out.tmp
'
test_expect_success 'ignore-blank-lines: between changes (with interhunkctx)' '
test_seq 10 >x &&
git update-index x &&
cat <<-\EOF >x &&
change
1
2
3
4
5
6
7
8
9
10
change
EOF
git diff --inter-hunk-context=2 --ignore-blank-lines >out.tmp &&
cat <<-\EOF >expected &&
diff --git a/x b/x
--- a/x
+++ b/x
@@ -1,10 +1,15 @@
+change
1
2
+
3
4
5
+
6
7
8
9
+
10
+change
EOF
compare_diff_patch expected out.tmp
'
test_expect_success 'ignore-blank-lines: scattered spaces' '
test_seq 10 >x &&
git update-index x &&
cat <<-\EOF >x &&
change
1
2
3
4
5
6
7
8
9
10
change
EOF
git diff --inter-hunk-context=4 --ignore-blank-lines >out.tmp &&
cat <<-\EOF >expected &&
diff --git a/x b/x
--- a/x
+++ b/x
@@ -1,3 +1,4 @@
+change
1
2
3
@@ -8,3 +15,4 @@
8
9
10
+change
EOF
compare_diff_patch expected out.tmp
'
test_expect_success 'ignore-blank-lines: spaces coalesce' '
test_seq 6 >x &&
git update-index x &&
cat <<-\EOF >x &&
change
1
2
3
4
5
6
change
EOF
git diff --inter-hunk-context=4 --ignore-blank-lines >out.tmp &&
cat <<-\EOF >expected &&
diff --git a/x b/x
--- a/x
+++ b/x
@@ -1,6 +1,11 @@
+change
1
2
3
+
4
+
5
+
6
+change
EOF
compare_diff_patch expected out.tmp
'
test_expect_success 'ignore-blank-lines: mix changes and blank lines' '
test_seq 16 >x &&
git update-index x &&
cat <<-\EOF >x &&
change
1
2
3
4
5
change
6
7
8
9
10
11
change
12
13
14
15
16
change
EOF
git diff --ignore-blank-lines >out.tmp &&
cat <<-\EOF >expected &&
diff --git a/x b/x
--- a/x
+++ b/x
@@ -1,8 +1,11 @@
+change
1
2
+
3
4
5
+change
6
7
8
@@ -9,8 +13,11 @@
9
10
11
+change
12
13
14
+
15
16
+change
EOF
compare_diff_patch expected out.tmp
'
test_expect_success 'check mixed spaces and tabs in indent' '
# This is indented with SP HT SP.
echo " foo();" >x &&
git diff --check | grep "space before tab in indent"
'
test_expect_success 'check mixed tabs and spaces in indent' '
# This is indented with HT SP HT.
echo " foo();" >x &&
git diff --check | grep "space before tab in indent"
'
test_expect_success 'check with no whitespace errors' '
git commit -m "snapshot" &&
echo "foo();" >x &&
git diff --check
'
test_expect_success 'check with trailing whitespace' '
echo "foo(); " >x &&
test_must_fail git diff --check
'
test_expect_success 'check with space before tab in indent' '
# indent has space followed by hard tab
echo " foo();" >x &&
test_must_fail git diff --check
'
test_expect_success '--check and --exit-code are not exclusive' '
git checkout x &&
git diff --check --exit-code
'
test_expect_success '--check and --quiet are not exclusive' '
git diff --check --quiet
'
test_expect_success 'check staged with no whitespace errors' '
echo "foo();" >x &&
git add x &&
git diff --cached --check
'
test_expect_success 'check staged with trailing whitespace' '
echo "foo(); " >x &&
git add x &&
test_must_fail git diff --cached --check
'
test_expect_success 'check staged with space before tab in indent' '
# indent has space followed by hard tab
echo " foo();" >x &&
git add x &&
test_must_fail git diff --cached --check
'
test_expect_success 'check with no whitespace errors (diff-index)' '
echo "foo();" >x &&
git add x &&
git diff-index --check HEAD
'
test_expect_success 'check with trailing whitespace (diff-index)' '
echo "foo(); " >x &&
git add x &&
test_must_fail git diff-index --check HEAD
'
test_expect_success 'check with space before tab in indent (diff-index)' '
# indent has space followed by hard tab
echo " foo();" >x &&
git add x &&
test_must_fail git diff-index --check HEAD
'
test_expect_success 'check staged with no whitespace errors (diff-index)' '
echo "foo();" >x &&
git add x &&
git diff-index --cached --check HEAD
'
test_expect_success 'check staged with trailing whitespace (diff-index)' '
echo "foo(); " >x &&
git add x &&
test_must_fail git diff-index --cached --check HEAD
'
test_expect_success 'check staged with space before tab in indent (diff-index)' '
# indent has space followed by hard tab
echo " foo();" >x &&
git add x &&
test_must_fail git diff-index --cached --check HEAD
'
test_expect_success 'check with no whitespace errors (diff-tree)' '
echo "foo();" >x &&
git commit -m "new commit" x &&
git diff-tree --check HEAD^ HEAD
'
test_expect_success 'check with trailing whitespace (diff-tree)' '
echo "foo(); " >x &&
git commit -m "another commit" x &&
test_must_fail git diff-tree --check HEAD^ HEAD
'
test_expect_success 'check with space before tab in indent (diff-tree)' '
# indent has space followed by hard tab
echo " foo();" >x &&
git commit -m "yet another" x &&
test_must_fail git diff-tree --check HEAD^ HEAD
'
test_expect_success 'check trailing whitespace (trailing-space: off)' '
git config core.whitespace "-trailing-space" &&
echo "foo (); " >x &&
git diff --check
'
test_expect_success 'check trailing whitespace (trailing-space: on)' '
git config core.whitespace "trailing-space" &&
echo "foo (); " >x &&
test_must_fail git diff --check
'
test_expect_success 'check space before tab in indent (space-before-tab: off)' '
# indent contains space followed by HT
git config core.whitespace "-space-before-tab" &&
echo " foo ();" >x &&
git diff --check
'
test_expect_success 'check space before tab in indent (space-before-tab: on)' '
# indent contains space followed by HT
git config core.whitespace "space-before-tab" &&
echo " foo (); " >x &&
test_must_fail git diff --check
'
test_expect_success 'check spaces as indentation (indent-with-non-tab: off)' '
git config core.whitespace "-indent-with-non-tab" &&
echo " foo ();" >x &&
git diff --check
'
test_expect_success 'check spaces as indentation (indent-with-non-tab: on)' '
git config core.whitespace "indent-with-non-tab" &&
echo " foo ();" >x &&
test_must_fail git diff --check
'
test_expect_success 'ditto, but tabwidth=9' '
git config core.whitespace "indent-with-non-tab,tabwidth=9" &&
git diff --check
'
test_expect_success 'check tabs and spaces as indentation (indent-with-non-tab: on)' '
git config core.whitespace "indent-with-non-tab" &&
echo " foo ();" >x &&
test_must_fail git diff --check
'
test_expect_success 'ditto, but tabwidth=10' '
git config core.whitespace "indent-with-non-tab,tabwidth=10" &&
test_must_fail git diff --check
'
test_expect_success 'ditto, but tabwidth=20' '
git config core.whitespace "indent-with-non-tab,tabwidth=20" &&
git diff --check
'
test_expect_success 'check tabs as indentation (tab-in-indent: off)' '
git config core.whitespace "-tab-in-indent" &&
echo " foo ();" >x &&
git diff --check
'
test_expect_success 'check tabs as indentation (tab-in-indent: on)' '
git config core.whitespace "tab-in-indent" &&
echo " foo ();" >x &&
test_must_fail git diff --check
'
test_expect_success 'check tabs and spaces as indentation (tab-in-indent: on)' '
git config core.whitespace "tab-in-indent" &&
echo " foo ();" >x &&
test_must_fail git diff --check
'
test_expect_success 'ditto, but tabwidth=1 (must be irrelevant)' '
git config core.whitespace "tab-in-indent,tabwidth=1" &&
test_must_fail git diff --check
'
test_expect_success 'check tab-in-indent and indent-with-non-tab conflict' '
git config core.whitespace "tab-in-indent,indent-with-non-tab" &&
echo "foo ();" >x &&
test_must_fail git diff --check
'
test_expect_success 'check tab-in-indent excluded from wildcard whitespace attribute' '
git config --unset core.whitespace &&
echo "x whitespace" >.gitattributes &&
echo " foo ();" >x &&
git diff --check &&
rm -f .gitattributes
'
test_expect_success 'line numbers in --check output are correct' '
echo "" >x &&
echo "foo(); " >>x &&
git diff --check | grep "x:2:"
'
test_expect_success 'checkdiff detects new trailing blank lines (1)' '
echo "foo();" >x &&
echo "" >>x &&
git diff --check | grep "new blank line"
'
test_expect_success 'checkdiff detects new trailing blank lines (2)' '
{ echo a; echo b; echo; echo; } >x &&
git add x &&
{ echo a; echo; echo; echo; echo; } >x &&
git diff --check | grep "new blank line"
'
test_expect_success 'checkdiff allows new blank lines' '
git checkout x &&
mv x y &&
(
echo "/* This is new */" &&
echo "" &&
cat y
) >x &&
git diff --check
'
cat <<EOF >expect
EOF
test_expect_success 'whitespace-only changes not reported' '
git reset --hard &&
echo >x "hello world" &&
git add x &&
git commit -m "hello 1" &&
echo >x "hello world" &&
git diff -b >actual &&
test_cmp expect actual
'
cat <<EOF >expect
diff --git a/x b/z
similarity index NUM%
rename from x
rename to z
index 380c32a..a97b785 100644
EOF
test_expect_success 'whitespace-only changes reported across renames' '
git reset --hard &&
for i in 1 2 3 4 5 6 7 8 9; do echo "$i$i$i$i$i$i"; done >x &&
git add x &&
git commit -m "base" &&
sed -e "5s/^/ /" x >z &&
git rm x &&
git add z &&
git diff -w -M --cached |
sed -e "/^similarity index /s/[0-9][0-9]*/NUM/" >actual &&
test_cmp expect actual
'
cat >expected <<\EOF
diff --git a/empty b/void
similarity index 100%
rename from empty
rename to void
EOF
test_expect_success 'rename empty' '
git reset --hard &&
>empty &&
git add empty &&
git commit -m empty &&
git mv empty void &&
git diff -w --cached -M >current &&
test_cmp expected current
'
test_expect_success 'combined diff with autocrlf conversion' '
git reset --hard &&
echo >x hello &&
git commit -m "one side" x &&
git checkout HEAD^ &&
echo >x goodbye &&
git commit -m "the other side" x &&
git config core.autocrlf true &&
test_must_fail git merge master &&
git diff | sed -e "1,/^@@@/d" >actual &&
! grep "^-" actual
'
# Start testing the colored format for whitespace checks
test_expect_success 'setup diff colors' '
git config color.diff always &&
git config color.diff.plain normal &&
git config color.diff.meta bold &&
git config color.diff.frag cyan &&
git config color.diff.func normal &&
git config color.diff.old red &&
git config color.diff.new green &&
git config color.diff.commit yellow &&
git config color.diff.whitespace blue &&
git config core.autocrlf false
'
test_expect_success 'diff that introduces a line with only tabs' '
git config core.whitespace blank-at-eol &&
git reset --hard &&
echo "test" >x &&
git commit -m "initial" x &&
echo "{NTN}" | tr "NT" "\n\t" >>x &&
git -c color.diff=always diff | test_decode_color >current &&
cat >expected <<-\EOF &&
<BOLD>diff --git a/x b/x<RESET>
<BOLD>index 9daeafb..2874b91 100644<RESET>
<BOLD>--- a/x<RESET>
<BOLD>+++ b/x<RESET>
<CYAN>@@ -1 +1,4 @@<RESET>
test<RESET>
<GREEN>+<RESET><GREEN>{<RESET>
<GREEN>+<RESET><BLUE> <RESET>
<GREEN>+<RESET><GREEN>}<RESET>
EOF
test_cmp expected current
'
test_expect_success 'diff that introduces and removes ws breakages' '
git reset --hard &&
{
echo "0. blank-at-eol " &&
echo "1. blank-at-eol "
} >x &&
git commit -a --allow-empty -m preimage &&
{
echo "0. blank-at-eol " &&
echo "1. still-blank-at-eol " &&
echo "2. and a new line "
} >x &&
git -c color.diff=always diff |
test_decode_color >current &&
cat >expected <<-\EOF &&
<BOLD>diff --git a/x b/x<RESET>
<BOLD>index d0233a2..700886e 100644<RESET>
<BOLD>--- a/x<RESET>
<BOLD>+++ b/x<RESET>
<CYAN>@@ -1,2 +1,3 @@<RESET>
0. blank-at-eol <RESET>
<RED>-1. blank-at-eol <RESET>
<GREEN>+<RESET><GREEN>1. still-blank-at-eol<RESET><BLUE> <RESET>
<GREEN>+<RESET><GREEN>2. and a new line<RESET><BLUE> <RESET>
EOF
test_cmp expected current
'
test_expect_success 'ws-error-highlight test setup' '
git reset --hard &&
{
echo "0. blank-at-eol " &&
echo "1. blank-at-eol "
} >x &&
git commit -a --allow-empty -m preimage &&
{
echo "0. blank-at-eol " &&
echo "1. still-blank-at-eol " &&
echo "2. and a new line "
} >x &&
cat >expect.default-old <<-\EOF &&
<BOLD>diff --git a/x b/x<RESET>
<BOLD>index d0233a2..700886e 100644<RESET>
<BOLD>--- a/x<RESET>
<BOLD>+++ b/x<RESET>
<CYAN>@@ -1,2 +1,3 @@<RESET>
0. blank-at-eol <RESET>
<RED>-<RESET><RED>1. blank-at-eol<RESET><BLUE> <RESET>
<GREEN>+<RESET><GREEN>1. still-blank-at-eol<RESET><BLUE> <RESET>
<GREEN>+<RESET><GREEN>2. and a new line<RESET><BLUE> <RESET>
EOF
cat >expect.all <<-\EOF &&
<BOLD>diff --git a/x b/x<RESET>
<BOLD>index d0233a2..700886e 100644<RESET>
<BOLD>--- a/x<RESET>
<BOLD>+++ b/x<RESET>
<CYAN>@@ -1,2 +1,3 @@<RESET>
<RESET>0. blank-at-eol<RESET><BLUE> <RESET>
<RED>-<RESET><RED>1. blank-at-eol<RESET><BLUE> <RESET>
<GREEN>+<RESET><GREEN>1. still-blank-at-eol<RESET><BLUE> <RESET>
<GREEN>+<RESET><GREEN>2. and a new line<RESET><BLUE> <RESET>
EOF
cat >expect.none <<-\EOF
<BOLD>diff --git a/x b/x<RESET>
<BOLD>index d0233a2..700886e 100644<RESET>
<BOLD>--- a/x<RESET>
<BOLD>+++ b/x<RESET>
<CYAN>@@ -1,2 +1,3 @@<RESET>
0. blank-at-eol <RESET>
<RED>-1. blank-at-eol <RESET>
<GREEN>+1. still-blank-at-eol <RESET>
<GREEN>+2. and a new line <RESET>
EOF
'
test_expect_success 'test --ws-error-highlight option' '
git -c color.diff=always diff --ws-error-highlight=default,old |
test_decode_color >current &&
test_cmp expect.default-old current &&
git -c color.diff=always diff --ws-error-highlight=all |
test_decode_color >current &&
test_cmp expect.all current &&
git -c color.diff=always diff --ws-error-highlight=none |
test_decode_color >current &&
test_cmp expect.none current
'
test_expect_success 'test diff.wsErrorHighlight config' '
git -c color.diff=always -c diff.wsErrorHighlight=default,old diff |
test_decode_color >current &&
test_cmp expect.default-old current &&
git -c color.diff=always -c diff.wsErrorHighlight=all diff |
test_decode_color >current &&
test_cmp expect.all current &&
git -c color.diff=always -c diff.wsErrorHighlight=none diff |
test_decode_color >current &&
test_cmp expect.none current
'
test_expect_success 'option overrides diff.wsErrorHighlight' '
git -c color.diff=always -c diff.wsErrorHighlight=none \
diff --ws-error-highlight=default,old |
test_decode_color >current &&
test_cmp expect.default-old current &&
git -c color.diff=always -c diff.wsErrorHighlight=default \
diff --ws-error-highlight=all |
test_decode_color >current &&
test_cmp expect.all current &&
git -c color.diff=always -c diff.wsErrorHighlight=all \
diff --ws-error-highlight=none |
test_decode_color >current &&
test_cmp expect.none current
'
test_expect_success 'detect moved code, complete file' '
git reset --hard &&
cat <<-\EOF >test.c &&
#include<stdio.h>
main()
{
printf("Hello World");
}
EOF
git add test.c &&
git commit -m "add main function" &&
git mv test.c main.c &&
test_config color.diff.oldMoved "normal red" &&
test_config color.diff.newMoved "normal green" &&
git diff HEAD --color-moved --no-renames | test_decode_color >actual &&
cat >expected <<-\EOF &&
<BOLD>diff --git a/main.c b/main.c<RESET>
<BOLD>new file mode 100644<RESET>
<BOLD>index 0000000..a986c57<RESET>
<BOLD>--- /dev/null<RESET>
<BOLD>+++ b/main.c<RESET>
<CYAN>@@ -0,0 +1,5 @@<RESET>
<BGREEN>+<RESET><BGREEN>#include<stdio.h><RESET>
<BGREEN>+<RESET><BGREEN>main()<RESET>
<BGREEN>+<RESET><BGREEN>{<RESET>
<BGREEN>+<RESET><BGREEN>printf("Hello World");<RESET>
<BGREEN>+<RESET><BGREEN>}<RESET>
<BOLD>diff --git a/test.c b/test.c<RESET>
<BOLD>deleted file mode 100644<RESET>
<BOLD>index a986c57..0000000<RESET>
<BOLD>--- a/test.c<RESET>
<BOLD>+++ /dev/null<RESET>
<CYAN>@@ -1,5 +0,0 @@<RESET>
<BRED>-#include<stdio.h><RESET>
<BRED>-main()<RESET>
<BRED>-{<RESET>
<BRED>-printf("Hello World");<RESET>
<BRED>-}<RESET>
EOF
test_cmp expected actual
'
test_expect_success 'detect malicious moved code, inside file' '
test_config color.diff.oldMoved "normal red" &&
test_config color.diff.newMoved "normal green" &&
test_config color.diff.oldMovedAlternative "blue" &&
test_config color.diff.newMovedAlternative "yellow" &&
git reset --hard &&
cat <<-\EOF >main.c &&
#include<stdio.h>
int stuff()
{
printf("Hello ");
printf("World\n");
}
int secure_foo(struct user *u)
{
if (!u->is_allowed_foo)
return;
foo(u);
}
int main()
{
foo();
}
EOF
cat <<-\EOF >test.c &&
#include<stdio.h>
int bar()
{
printf("Hello World, but different\n");
}
int another_function()
{
bar();
}
EOF
git add main.c test.c &&
git commit -m "add main and test file" &&
cat <<-\EOF >main.c &&
#include<stdio.h>
int stuff()
{
printf("Hello ");
printf("World\n");
}
int main()
{
foo();
}
EOF
cat <<-\EOF >test.c &&
#include<stdio.h>
int bar()
{
printf("Hello World, but different\n");
}
int secure_foo(struct user *u)
{
foo(u);
if (!u->is_allowed_foo)
return;
}
int another_function()
{
bar();
}
EOF
git diff HEAD --no-renames --color-moved=zebra| test_decode_color >actual &&
cat <<-\EOF >expected &&
<BOLD>diff --git a/main.c b/main.c<RESET>
<BOLD>index 27a619c..7cf9336 100644<RESET>
<BOLD>--- a/main.c<RESET>
<BOLD>+++ b/main.c<RESET>
<CYAN>@@ -5,13 +5,6 @@<RESET> <RESET>printf("Hello ");<RESET>
printf("World\n");<RESET>
}<RESET>
<RESET>
<BRED>-int secure_foo(struct user *u)<RESET>
<BRED>-{<RESET>
<BLUE>-if (!u->is_allowed_foo)<RESET>
<BLUE>-return;<RESET>
<BRED>-foo(u);<RESET>
<BLUE>-}<RESET>
<BLUE>-<RESET>
int main()<RESET>
{<RESET>
foo();<RESET>
<BOLD>diff --git a/test.c b/test.c<RESET>
<BOLD>index 1dc1d85..2bedec9 100644<RESET>
<BOLD>--- a/test.c<RESET>
<BOLD>+++ b/test.c<RESET>
<CYAN>@@ -4,6 +4,13 @@<RESET> <RESET>int bar()<RESET>
printf("Hello World, but different\n");<RESET>
}<RESET>
<RESET>
<BGREEN>+<RESET><BGREEN>int secure_foo(struct user *u)<RESET>
<BGREEN>+<RESET><BGREEN>{<RESET>
<YELLOW>+<RESET><YELLOW>foo(u);<RESET>
<BGREEN>+<RESET><BGREEN>if (!u->is_allowed_foo)<RESET>
<BGREEN>+<RESET><BGREEN>return;<RESET>
<YELLOW>+<RESET><YELLOW>}<RESET>
<YELLOW>+<RESET>
int another_function()<RESET>
{<RESET>
bar();<RESET>
EOF
test_cmp expected actual
'
test_expect_success 'no effect from --color-moved with --word-diff' '
cat <<-\EOF >text.txt &&
Lorem Ipsum is simply dummy text of the printing and typesetting industry.
EOF
git add text.txt &&
git commit -a -m "clean state" &&
cat <<-\EOF >text.txt &&
simply Lorem Ipsum dummy is text of the typesetting and printing industry.
EOF
git diff --color-moved --word-diff >actual &&
git diff --word-diff >expect &&
test_cmp expect actual
'
test_expect_success 'move detection ignoring whitespace ' '
git reset --hard &&
cat <<\EOF >lines.txt &&
line 1
line 2
line 3
line 4
line 5
line 6
line 7
EOF
git add lines.txt &&
git commit -m "add poetry" &&
cat <<\EOF >lines.txt &&
line 5
line 6
line 7
line 1
line 2
line 3
line 4
EOF
test_config color.diff.oldMoved "magenta" &&
test_config color.diff.newMoved "cyan" &&
git diff HEAD --no-renames --color-moved| test_decode_color >actual &&
cat <<-\EOF >expected &&
<BOLD>diff --git a/lines.txt b/lines.txt<RESET>
<BOLD>index 734156d..eb89ead 100644<RESET>
<BOLD>--- a/lines.txt<RESET>
<BOLD>+++ b/lines.txt<RESET>
<CYAN>@@ -1,7 +1,7 @@<RESET>
<GREEN>+<RESET> <GREEN>line 5<RESET>
<GREEN>+<RESET> <GREEN>line 6<RESET>
<GREEN>+<RESET> <GREEN>line 7<RESET>
line 1<RESET>
line 2<RESET>
line 3<RESET>
line 4<RESET>
<RED>-line 5<RESET>
<RED>-line 6<RESET>
<RED>-line 7<RESET>
EOF
test_cmp expected actual &&
git diff HEAD --no-renames -w --color-moved| test_decode_color >actual &&
cat <<-\EOF >expected &&
<BOLD>diff --git a/lines.txt b/lines.txt<RESET>
<BOLD>index 734156d..eb89ead 100644<RESET>
<BOLD>--- a/lines.txt<RESET>
<BOLD>+++ b/lines.txt<RESET>
<CYAN>@@ -1,7 +1,7 @@<RESET>
<CYAN>+<RESET> <CYAN>line 5<RESET>
<CYAN>+<RESET> <CYAN>line 6<RESET>
<CYAN>+<RESET> <CYAN>line 7<RESET>
line 1<RESET>
line 2<RESET>
line 3<RESET>
line 4<RESET>
<MAGENTA>-line 5<RESET>
<MAGENTA>-line 6<RESET>
<MAGENTA>-line 7<RESET>
EOF
test_cmp expected actual
'
test_expect_success 'move detection with submodules' '
test_create_repo bananas &&
echo ripe >bananas/recipe &&
git -C bananas add recipe &&
test_commit fruit &&
test_commit -C bananas recipe &&
git submodule add ./bananas &&
git add bananas &&
git commit -a -m "bananas are like a heavy library?" &&
echo foul >bananas/recipe &&
echo ripe >fruit.t &&
git diff --submodule=diff --color-moved >actual &&
# no move detection as the moved line is across repository boundaries.
test_decode_color <actual >decoded_actual &&
! grep BGREEN decoded_actual &&
! grep BRED decoded_actual &&
# nor did we mess with it another way
git diff --submodule=diff | test_decode_color >expect &&
test_cmp expect decoded_actual
'
test_done
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