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bluekeyesbluekeyes
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Check for leftover content after a full delete (#9)
When applying a text fragment that deletes all content in the file, make sure there is no content left in the source after using all the lines in the fragment. If there is is extra content, it's a conflict: something added more lines to the file after generating the patch.
1 parent b5ae0bd commit 4fa9801

11 files changed

+357
-8
lines changed

‎gitdiff/apply.go‎

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -259,6 +259,19 @@ func (a *Applier) ApplyTextFragment(dst io.Writer, f *TextFragment) error {
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}
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}
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a.nextLine = fragStart + used
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// new position of +0,0 mean a full delete, so check for leftovers
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if f.NewPosition == 0 && f.NewLines == 0 {
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var b [1][]byte
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n, err := a.lineSrc.ReadLinesAt(b[:], a.nextLine)
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if err != nil && err != io.EOF {
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return applyError(err, lineNum(a.nextLine))
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}
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if n > 0 {
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return applyError(&Conflict{"src still has content after full delete"}, lineNum(a.nextLine))
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}
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}
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return nil
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}
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‎gitdiff/apply_test.go‎

Lines changed: 28 additions & 4 deletions
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@@ -185,9 +185,33 @@ func TestApplyBinaryFragment(t *testing.T) {
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func TestApplyFile(t *testing.T) {
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tests := map[string]applyTest{
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"textModify": {Files: getApplyFiles("text_file_modify")},
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"binaryModify": {Files: getApplyFiles("bin_file_modify")},
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"modeChange": {Files: getApplyFiles("file_mode_change")},
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"textModify": {
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Files: applyFiles{
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Src: "file_text.src",
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Patch: "file_text_modify.patch",
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Out: "file_text_modify.out",
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},
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},
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"textDelete": {
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Files: applyFiles{
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Src: "file_text.src",
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Patch: "file_text_delete.patch",
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Out: "file_text_delete.out",
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},
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},
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"textErrorPartialDelete": {
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Files: applyFiles{
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Src: "file_text.src",
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Patch: "file_text_error_partial_delete.patch",
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},
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Err: &Conflict{},
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},
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"binaryModify": {
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Files: getApplyFiles("file_bin_modify"),
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},
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"modeChange": {
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Files: getApplyFiles("file_mode_change"),
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},
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}
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for name, test := range tests {
@@ -233,7 +257,7 @@ func (at applyTest) run(t *testing.T, apply func(io.Writer, *Applier, *File) err
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}
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if !bytes.Equal(out, dst.Bytes()) {
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t.Errorf("incorrect result after apply\nexpected:\n%x\nactual:\n%x", out, dst.Bytes())
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t.Errorf("incorrect result after apply\nexpected:\n%q\nactual:\n%q", out, dst.Bytes())
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}
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}
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‎gitdiff/testdata/apply/bin_file_modify.out‎ renamed to ‎gitdiff/testdata/apply/file_bin_modify.out‎

File renamed without changes.

‎gitdiff/testdata/apply/bin_file_modify.patch‎ renamed to ‎gitdiff/testdata/apply/file_bin_modify.patch‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
diff --git a/gitdiff/testdata/apply/bin_file_modify.src b/gitdiff/testdata/apply/bin_file_modify.src
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diff --git a/gitdiff/testdata/apply/file_bin_modify.src b/gitdiff/testdata/apply/file_bin_modify.src
22
GIT binary patch
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delta 172
44
zcmV;d08{^f2)qc8AP{I3VQ>J`s>wb0HU+h#6w8q?tUO~cHmDjZi2<8yZ9XmKhhMdo

‎gitdiff/testdata/apply/bin_file_modify.src‎ renamed to ‎gitdiff/testdata/apply/file_bin_modify.src‎

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‎gitdiff/testdata/apply/text_file_modify.src‎ renamed to ‎gitdiff/testdata/apply/file_text.src‎

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‎gitdiff/testdata/apply/file_text_delete.out‎

Whitespace-only changes.

‎gitdiff/testdata/apply/file_text_delete.patch‎

Lines changed: 206 additions & 0 deletions
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@@ -0,0 +1,206 @@
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diff --git a/gitdiff/testdata/apply/file_text.src.src b/gitdiff/testdata/apply/file_text.src
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deleted file mode 100644
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index 3805ad4..0000000
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--- a/gitdiff/testdata/apply/file_text.src.src
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+++ /dev/null
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@@ -1,200 +0,0 @@
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-this is line 1
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‎gitdiff/testdata/apply/file_text_error_partial_delete.patch‎

Lines changed: 106 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,106 @@
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diff --git a/gitdiff/testdata/apply/file_text.src.src b/gitdiff/testdata/apply/file_text.src
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deleted file mode 100644
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index 3805ad4..0000000
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--- a/gitdiff/testdata/apply/file_text.src.src
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+++ /dev/null
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@@ -1,100 +0,0 @@
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-this is line 1
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‎gitdiff/testdata/apply/text_file_modify.out‎ renamed to ‎gitdiff/testdata/apply/file_text_modify.out‎

File renamed without changes.

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