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https://github.com/woodpecker-ci/woodpecker.git
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132 lines
3.5 KiB
Go
132 lines
3.5 KiB
Go
package diff
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import (
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"bytes"
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"time"
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)
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// A FileDiff represents a unified diff for a single file.
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//
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// A file unified diff has a header that resembles the following:
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//
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// --- oldname 2009-10-11 15:12:20.000000000 -0700
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// +++ newname 2009-10-11 15:12:30.000000000 -0700
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type FileDiff struct {
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// the original name of the file
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OrigName string
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// the original timestamp (nil if not present)
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OrigTime *time.Time
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// the new name of the file (often same as OrigName)
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NewName string
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// the new timestamp (nil if not present)
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NewTime *time.Time
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// extended header lines (e.g., git's "new mode <mode>", "rename from <path>", etc.)
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Extended []string
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// hunks that were changed from orig to new
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Hunks []*Hunk
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}
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// A Hunk represents a series of changes (additions or deletions) in a file's
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// unified diff.
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type Hunk struct {
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// starting line number in original file
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OrigStartLine int32
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// number of lines the hunk applies to in the original file
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OrigLines int32
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// if > 0, then the original file had a 'No newline at end of file' mark at this offset
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OrigNoNewlineAt int32
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// starting line number in new file
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NewStartLine int32
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// number of lines the hunk applies to in the new file
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NewLines int32
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// optional section heading
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Section string
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// 0-indexed line offset in unified file diff (including section headers); this is
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// only set when Hunks are read from entire file diff (i.e., when ReadAllHunks is
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// called) This accounts for hunk headers, too, so the StartPosition of the first
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// hunk will be 1.
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StartPosition int32
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// hunk body (lines prefixed with '-', '+', or ' ')
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Body []byte
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}
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// A Stat is a diff stat that represents the number of lines added/changed/deleted.
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type Stat struct {
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// number of lines added
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Added int32
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// number of lines changed
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Changed int32
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// number of lines deleted
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Deleted int32
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}
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// Stat computes the number of lines added/changed/deleted in all
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// hunks in this file's diff.
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func (d *FileDiff) Stat() Stat {
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total := Stat{}
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for _, h := range d.Hunks {
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total.add(h.Stat())
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}
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return total
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}
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// Stat computes the number of lines added/changed/deleted in this
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// hunk.
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func (h *Hunk) Stat() Stat {
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lines := bytes.Split(h.Body, []byte{'\n'})
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var last byte
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st := Stat{}
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for _, line := range lines {
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if len(line) == 0 {
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last = 0
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continue
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}
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switch line[0] {
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case '-':
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if last == '+' {
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st.Added--
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st.Changed++
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last = 0 // next line can't change this one since this is already a change
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} else {
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st.Deleted++
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last = line[0]
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}
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case '+':
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if last == '-' {
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st.Deleted--
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st.Changed++
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last = 0 // next line can't change this one since this is already a change
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} else {
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st.Added++
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last = line[0]
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}
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default:
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last = 0
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}
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}
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return st
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}
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var (
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hunkPrefix = []byte("@@ ")
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onlyInMessagePrefix = []byte("Only in ")
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)
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const hunkHeader = "@@ -%d,%d +%d,%d @@"
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const onlyInMessage = "Only in %s: %s\n"
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// diffTimeParseLayout is the layout used to parse the time in unified diff file
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// header timestamps.
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// See https://www.gnu.org/software/diffutils/manual/html_node/Detailed-Unified.html.
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const diffTimeParseLayout = "2006-01-02 15:04:05 -0700"
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// diffTimeFormatLayout is the layout used to format (i.e., print) the time in unified diff file
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// header timestamps.
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// See https://www.gnu.org/software/diffutils/manual/html_node/Detailed-Unified.html.
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const diffTimeFormatLayout = "2006-01-02 15:04:05.000000000 -0700"
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func (s *Stat) add(o Stat) {
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s.Added += o.Added
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s.Changed += o.Changed
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s.Deleted += o.Deleted
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}
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