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package patch
import "fmt"
// Example hunk:
// @@ -16,2 +14,3 @@ func (f *CommitFile) Description() string {
// return f.Name
// -}
// +
// +// test
type Hunk struct {
// the line number of the first line in the old file ('16' in the above example)
oldStart int
// the line number of the first line in the new file ('14' in the above example)
newStart int
// the context at the end of the header line (' func (f *CommitFile) Description() string {' in the above example)
headerContext string
// the body of the hunk, excluding the header line
bodyLines []*PatchLine
}
// Returns the number of lines in the hunk in the original file ('2' in the above example)
func (self *Hunk) oldLength() int {
return nLinesWithKind(self.bodyLines, []PatchLineKind{CONTEXT, DELETION})
}
// Returns the number of lines in the hunk in the new file ('3' in the above example)
func (self *Hunk) newLength() int {
return nLinesWithKind(self.bodyLines, []PatchLineKind{CONTEXT, ADDITION})
}
// Returns true if the hunk contains any changes (i.e. if it's not just a context hunk).
// We'll end up with a context hunk if we're transforming a patch and one of the hunks
// has no selected lines.
func (self *Hunk) containsChanges() bool {
return nLinesWithKind(self.bodyLines, []PatchLineKind{ADDITION, DELETION}) > 0
}
// Returns the number of lines in the hunk, including the header line
func (self *Hunk) lineCount() int {
return len(self.bodyLines) + 1
}
// Returns all lines in the hunk, including the header line
func (self *Hunk) allLines() []*PatchLine {
lines := []*PatchLine{{Content: self.formatHeaderLine(), Kind: HUNK_HEADER}}
lines = append(lines, self.bodyLines...)
return lines
}
// Returns the header line, including the unified diff header and the context
func (self *Hunk) formatHeaderLine() string {
return fmt.Sprintf("%s%s", self.formatHeaderStart(), self.headerContext)
}
// Returns the first part of the header line i.e. the unified diff part (excluding any context)
func (self *Hunk) formatHeaderStart() string {
newLengthDisplay := ""
newLength := self.newLength()
// if the new length is 1, it's omitted
if newLength != 1 {
newLengthDisplay = fmt.Sprintf(",%d", newLength)
}
return fmt.Sprintf("@@ -%d,%d +%d%s @@", self.oldStart, self.oldLength(), self.newStart, newLengthDisplay)
}
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