t/t4051-diff-function-context.sh

   1 #!/bin/sh
   2
   3 test_description='diff function context'
   4
   5 . ./test-lib.sh
   6
   7 dir="$TEST_DIRECTORY/t4051"
   8
   9 commit_and_tag () {
  10         tag=$1 &&
  11         shift &&
  12         git add "$@" &&
  13         test_tick &&
  14         git commit -m "$tag" &&
  15         git tag "$tag"
  16 }
  17
  18 first_context_line () {
  19         awk '
  20                 found {print; exit}
  21                 /^@@/ {found = 1}
  22         '
  23 }
  24
  25 last_context_line () {
  26         sed -ne \$p
  27 }
  28
  29 check_diff () {
  30         name=$1
  31         desc=$2
  32         options="-W $3"
  33
  34         test_expect_success "$desc" '
  35                 git diff $options "$name^" "$name" >"$name.diff"
  36         '
  37
  38         test_expect_success ' diff applies' '
  39                 test_when_finished "git reset --hard" &&
  40                 git checkout --detach "$name^" &&
  41                 git apply --index "$name.diff" &&
  42                 git diff --exit-code "$name"
  43         '
  44 }
  45
  46 test_expect_success 'setup' '
  47         cat "$dir/includes.c" "$dir/dummy.c" "$dir/dummy.c" "$dir/hello.c" \
  48                 "$dir/dummy.c" "$dir/dummy.c" >file.c &&
  49         commit_and_tag initial file.c &&
  50
  51         grep -v "delete me from hello" <file.c >file.c.new &&
  52         mv file.c.new file.c &&
  53         commit_and_tag changed_hello file.c &&
  54
  55         grep -v "delete me from includes" <file.c >file.c.new &&
  56         mv file.c.new file.c &&
  57         commit_and_tag changed_includes file.c &&
  58
  59         cat "$dir/appended1.c" >>file.c &&
  60         commit_and_tag appended file.c &&
  61
  62         cat "$dir/appended2.c" >>file.c &&
  63         commit_and_tag extended file.c &&
  64
  65         grep -v "Begin of second part" <file.c >file.c.new &&
  66         mv file.c.new file.c &&
  67         commit_and_tag long_common_tail file.c &&
  68
  69         git checkout initial &&
  70         cat "$dir/hello.c" "$dir/dummy.c" >file.c &&
  71         commit_and_tag hello_dummy file.c &&
  72
  73         # overlap function context of 1st change and -u context of 2nd change
  74         grep -v "delete me from hello" <"$dir/hello.c" >file.c &&
  75         sed "2a\\
  76              extra line" <"$dir/dummy.c" >>file.c &&
  77         commit_and_tag changed_hello_dummy file.c &&
  78
  79         git checkout initial &&
  80         grep -v "delete me from hello" <file.c >file.c.new &&
  81         mv file.c.new file.c &&
  82         cat "$dir/appended1.c" >>file.c &&
  83         commit_and_tag changed_hello_appended file.c
  84 '
  85
  86 check_diff changed_hello 'changed function'
  87
  88 test_expect_success ' context includes begin' '
  89         grep "^ .*Begin of hello" changed_hello.diff
  90 '
  91
  92 test_expect_success ' context includes end' '
  93         grep "^ .*End of hello" changed_hello.diff
  94 '
  95
  96 test_expect_success ' context does not include other functions' '
  97         test $(grep -c "^[ +-].*Begin" changed_hello.diff) -le 1
  98 '
  99
 100 test_expect_success ' context does not include preceding empty lines' '
 101         test "$(first_context_line <changed_hello.diff)" != " "
 102 '
 103
 104 test_expect_success ' context does not include trailing empty lines' '
 105         test "$(last_context_line <changed_hello.diff)" != " "
 106 '
 107
 108 check_diff changed_includes 'changed includes'
 109
 110 test_expect_success ' context includes begin' '
 111         grep "^ .*Begin.h" changed_includes.diff
 112 '
 113
 114 test_expect_success ' context includes end' '
 115         grep "^ .*End.h" changed_includes.diff
 116 '
 117
 118 test_expect_success ' context does not include other functions' '
 119         test $(grep -c "^[ +-].*Begin" changed_includes.diff) -le 1
 120 '
 121
 122 test_expect_success ' context does not include trailing empty lines' '
 123         test "$(last_context_line <changed_includes.diff)" != " "
 124 '
 125
 126 check_diff appended 'appended function'
 127
 128 test_expect_success ' context includes begin' '
 129         grep "^[+].*Begin of first part" appended.diff
 130 '
 131
 132 test_expect_success ' context includes end' '
 133         grep "^[+].*End of first part" appended.diff
 134 '
 135
 136 test_expect_success ' context does not include other functions' '
 137         test $(grep -c "^[ +-].*Begin" appended.diff) -le 1
 138 '
 139
 140 check_diff extended 'appended function part'
 141
 142 test_expect_success ' context includes begin' '
 143         grep "^ .*Begin of first part" extended.diff
 144 '
 145
 146 test_expect_success ' context includes end' '
 147         grep "^[+].*End of second part" extended.diff
 148 '
 149
 150 test_expect_success ' context does not include other functions' '
 151         test $(grep -c "^[ +-].*Begin" extended.diff) -le 2
 152 '
 153
 154 test_expect_success ' context does not include preceding empty lines' '
 155         test "$(first_context_line <extended.diff)" != " "
 156 '
 157
 158 check_diff long_common_tail 'change with long common tail and no context' -U0
 159
 160 test_expect_success ' context includes begin' '
 161         grep "^ .*Begin of first part" long_common_tail.diff
 162 '
 163
 164 test_expect_success ' context includes end' '
 165         grep "^ .*End of second part" long_common_tail.diff
 166 '
 167
 168 test_expect_success ' context does not include other functions' '
 169         test $(grep -c "^[ +-].*Begin" long_common_tail.diff) -le 2
 170 '
 171
 172 test_expect_success ' context does not include preceding empty lines' '
 173         test "$(first_context_line <long_common_tail.diff.diff)" != " "
 174 '
 175
 176 check_diff changed_hello_appended 'changed function plus appended function'
 177
 178 test_expect_success ' context includes begin' '
 179         grep "^ .*Begin of hello" changed_hello_appended.diff &&
 180         grep "^[+].*Begin of first part" changed_hello_appended.diff
 181 '
 182
 183 test_expect_success ' context includes end' '
 184         grep "^ .*End of hello" changed_hello_appended.diff &&
 185         grep "^[+].*End of first part" changed_hello_appended.diff
 186 '
 187
 188 test_expect_success ' context does not include other functions' '
 189         test $(grep -c "^[ +-].*Begin" changed_hello_appended.diff) -le 2
 190 '
 191
 192 check_diff changed_hello_dummy 'changed two consecutive functions'
 193
 194 test_expect_success ' context includes begin' '
 195         grep "^ .*Begin of hello" changed_hello_dummy.diff &&
 196         grep "^ .*Begin of dummy" changed_hello_dummy.diff
 197 '
 198
 199 test_expect_success ' context includes end' '
 200         grep "^ .*End of hello" changed_hello_dummy.diff &&
 201         grep "^ .*End of dummy" changed_hello_dummy.diff
 202 '
 203
 204 test_expect_success ' overlapping hunks are merged' '
 205         test $(grep -c "^@@" changed_hello_dummy.diff) -eq 1
 206 '
 207
 208 test_done