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1#!/bin/sh
2
3test_description='anchored diff algorithm'
4
5. ./test-lib.sh
6
7test_expect_success '--anchored' '
8 printf "a\nb\nc\n" >pre &&
9 printf "c\na\nb\n" >post &&
10
11 # normally, c is moved to produce the smallest diff
12 test_expect_code 1 git diff --no-index pre post >diff &&
13 grep "^+c" diff &&
14
15 # with anchor, a is moved
16 test_expect_code 1 git diff --no-index --anchored=c pre post >diff &&
17 grep "^+a" diff
18'
19
20test_expect_success '--anchored multiple' '
21 printf "a\nb\nc\nd\ne\nf\n" >pre &&
22 printf "c\na\nb\nf\nd\ne\n" >post &&
23
24 # with 1 anchor, c is not moved, but f is moved
25 test_expect_code 1 git diff --no-index --anchored=c pre post >diff &&
26 grep "^+a" diff && # a is moved instead of c
27 grep "^+f" diff &&
28
29 # with 2 anchors, c and f are not moved
30 test_expect_code 1 git diff --no-index --anchored=c --anchored=f pre post >diff &&
31 grep "^+a" diff &&
32 grep "^+d" diff # d is moved instead of f
33'
34
35test_expect_success '--anchored with nonexistent line has no effect' '
36 printf "a\nb\nc\n" >pre &&
37 printf "c\na\nb\n" >post &&
38
39 test_expect_code 1 git diff --no-index --anchored=x pre post >diff &&
40 grep "^+c" diff
41'
42
43test_expect_success '--anchored with non-unique line has no effect' '
44 printf "a\nb\nc\nd\ne\nc\n" >pre &&
45 printf "c\na\nb\nc\nd\ne\n" >post &&
46
47 test_expect_code 1 git diff --no-index --anchored=c pre post >diff &&
48 grep "^+c" diff
49'
50
51test_expect_success 'diff still produced with impossible multiple --anchored' '
52 printf "a\nb\nc\n" >pre &&
53 printf "c\na\nb\n" >post &&
54
55 test_expect_code 1 git diff --no-index --anchored=a --anchored=c pre post >diff &&
56 mv post expected_post &&
57
58 # Ensure that the diff is correct by applying it and then
59 # comparing the result with the original
60 git apply diff &&
61 diff expected_post post
62'
63
64test_expect_success 'later algorithm arguments override earlier ones' '
65 printf "a\nb\nc\n" >pre &&
66 printf "c\na\nb\n" >post &&
67
68 test_expect_code 1 git diff --no-index --patience --anchored=c pre post >diff &&
69 grep "^+a" diff &&
70
71 test_expect_code 1 git diff --no-index --anchored=c --patience pre post >diff &&
72 grep "^+c" diff &&
73
74 test_expect_code 1 git diff --no-index --histogram --anchored=c pre post >diff &&
75 grep "^+a" diff &&
76
77 test_expect_code 1 git diff --no-index --anchored=c --histogram pre post >diff &&
78 grep "^+c" diff
79'
80
81test_expect_success '--anchored works with other commands like "git show"' '
82 printf "a\nb\nc\n" >file &&
83 git add file &&
84 git commit -m foo &&
85 printf "c\na\nb\n" >file &&
86 git add file &&
87 git commit -m foo &&
88
89 # with anchor, a is moved
90 git show --patience --anchored=c >diff &&
91 grep "^+a" diff
92'
93
94test_done