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diff.go
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diff.go
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/*
* Copyright 2021 American Express
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package git
import (
"fmt"
"strings"
)
const (
pathSep = " b/"
)
// GetHashKey returns the hash key identifier for the diff
func (d *DiffItem) GetHashKey() string {
if d.commit != "" {
return fmt.Sprintf("%s:%s", d.commit, d.fPath)
}
return d.fPath
}
// Diff is a list of split diffs
type Diff struct {
Items []DiffItem
Error error
commitTmp string
}
// Push a diff on to the list
func (d *Diff) Push(s string) {
var commitHeader, commit string
if beginsWithHash(s) {
commitHeader, s = split(s, "\n")
commit = extractHash(commitHeader)
d.commitTmp = commit
}
// add commit to diffs within each diff which do not
// have the commit on the line directly above them
if d.commitTmp != "" && commit == "" {
commit = d.commitTmp
}
fPath, err := extractFilePath(s)
if err != nil {
d.Error = err
return
}
d.Items = append(d.Items, DiffItem{
raw: s,
fPath: fPath,
commit: commit,
})
}
// split out logic from scan.go
func beginsWithHash(s string) bool {
return strings.Contains(s, "commit")
}
func split(s, sep string) (string, string) {
// Empty string should just return empty
if len(s) == 0 {
return s, s
}
slice := strings.SplitN(s, sep, 2)
// Incase no separator was present
if len(slice) == 1 {
return slice[0], ""
}
return slice[0], slice[1]
}
func extractFilePath(in string) (string, error) {
pathBIndex := strings.Index(in, pathSep)
newLineIndex := strings.Index(in, "\n")
if pathBIndex >= 0 && newLineIndex > pathBIndex {
return in[pathBIndex+len(pathSep) : newLineIndex], nil
}
return "", fmt.Errorf("Not valid diff content:\n%s", in)
}
func extractHash(in string) string {
if len(strings.Fields(in)) >= 2 {
return strings.Fields(in)[1]
}
return ""
}