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 2p <"$dir/dummy.c" >>file.c &&
  76         commit_and_tag changed_hello_dummy file.c &&
  77
  78         git checkout initial &&
  79         grep -v "delete me from hello" <file.c >file.c.new &&
  80         mv file.c.new file.c &&
  81         cat "$dir/appended1.c" >>file.c &&
  82         commit_and_tag changed_hello_appended file.c
  83 '
  84
  85 check_diff changed_hello 'changed function'
  86
  87 test_expect_success ' context includes begin' '
  88         grep "^ .*Begin of hello" changed_hello.diff
  89 '
  90
  91 test_expect_success ' context includes end' '
  92         grep "^ .*End of hello" changed_hello.diff
  93 '
  94
  95 test_expect_success ' context does not include other functions' '
  96         test $(grep -c "^[ +-].*Begin" changed_hello.diff) -le 1
  97 '
  98
  99 test_expect_success ' context does not include preceding empty lines' '
 100         test "$(first_context_line <changed_hello.diff)" != " "
 101 '
 102
 103 test_expect_success ' context does not include trailing empty lines' '
 104         test "$(last_context_line <changed_hello.diff)" != " "
 105 '
 106
 107 check_diff changed_includes 'changed includes'
 108
 109 test_expect_success ' context includes begin' '
 110         grep "^ .*Begin.h" changed_includes.diff
 111 '
 112
 113 test_expect_success ' context includes end' '
 114         grep "^ .*End.h" changed_includes.diff
 115 '
 116
 117 test_expect_success ' context does not include other functions' '
 118         test $(grep -c "^[ +-].*Begin" changed_includes.diff) -le 1
 119 '
 120
 121 test_expect_success ' context does not include trailing empty lines' '
 122         test "$(last_context_line <changed_includes.diff)" != " "
 123 '
 124
 125 check_diff appended 'appended function'
 126
 127 test_expect_success ' context includes begin' '
 128         grep "^[+].*Begin of first part" appended.diff
 129 '
 130
 131 test_expect_success ' context includes end' '
 132         grep "^[+].*End of first part" appended.diff
 133 '
 134
 135 test_expect_success ' context does not include other functions' '
 136         test $(grep -c "^[ +-].*Begin" appended.diff) -le 1
 137 '
 138
 139 check_diff extended 'appended function part'
 140
 141 test_expect_success ' context includes begin' '
 142         grep "^ .*Begin of first part" extended.diff
 143 '
 144
 145 test_expect_success ' context includes end' '
 146         grep "^[+].*End of second part" extended.diff
 147 '
 148
 149 test_expect_success ' context does not include other functions' '
 150         test $(grep -c "^[ +-].*Begin" extended.diff) -le 2
 151 '
 152
 153 test_expect_success ' context does not include preceding empty lines' '
 154         test "$(first_context_line <extended.diff)" != " "
 155 '
 156
 157 check_diff long_common_tail 'change with long common tail and no context' -U0
 158
 159 test_expect_success ' context includes begin' '
 160         grep "^ .*Begin of first part" long_common_tail.diff
 161 '
 162
 163 test_expect_success ' context includes end' '
 164         grep "^ .*End of second part" long_common_tail.diff
 165 '
 166
 167 test_expect_success ' context does not include other functions' '
 168         test $(grep -c "^[ +-].*Begin" long_common_tail.diff) -le 2
 169 '
 170
 171 test_expect_success ' context does not include preceding empty lines' '
 172         test "$(first_context_line <long_common_tail.diff.diff)" != " "
 173 '
 174
 175 check_diff changed_hello_appended 'changed function plus appended function'
 176
 177 test_expect_success ' context includes begin' '
 178         grep "^ .*Begin of hello" changed_hello_appended.diff &&
 179         grep "^[+].*Begin of first part" changed_hello_appended.diff
 180 '
 181
 182 test_expect_success ' context includes end' '
 183         grep "^ .*End of hello" changed_hello_appended.diff &&
 184         grep "^[+].*End of first part" changed_hello_appended.diff
 185 '
 186
 187 test_expect_success ' context does not include other functions' '
 188         test $(grep -c "^[ +-].*Begin" changed_hello_appended.diff) -le 2
 189 '
 190
 191 check_diff changed_hello_dummy 'changed two consecutive functions'
 192
 193 test_expect_success ' context includes begin' '
 194         grep "^ .*Begin of hello" changed_hello_dummy.diff &&
 195         grep "^ .*Begin of dummy" changed_hello_dummy.diff
 196 '
 197
 198 test_expect_success ' context includes end' '
 199         grep "^ .*End of hello" changed_hello_dummy.diff &&
 200         grep "^ .*End of dummy" changed_hello_dummy.diff
 201 '
 202
 203 test_expect_success ' overlapping hunks are merged' '
 204         test $(grep -c "^@@" changed_hello_dummy.diff) -eq 1
 205 '
 206
 207 test_done