Add licensediff and tests for 2.2

Signed-off-by: Steve Winslow <steve@swinslow.net>

1 files changed, 30 insertions, 2 deletions

diff --git a/licensediff/licensediff.go b/licensediff/licensediff.go
index 9d693b0..4b2f0ac 100644
--- a/licensediff/licensediff.go
+++ b/licensediff/licensediff.go
@@ -14,9 +14,37 @@ type LicensePair struct {
 	Second string
 }
 
-// MakePairs essentially just consolidates all files and LicenseConcluded
+// MakePairs2_1 essentially just consolidates all files and LicenseConcluded
 // strings into a single data structure.
-func MakePairs(p1 *spdx.Package2_1, p2 *spdx.Package2_1) (map[string]LicensePair, error) {
+func MakePairs2_1(p1 *spdx.Package2_1, p2 *spdx.Package2_1) (map[string]LicensePair, error) {
+	pairs := map[string]LicensePair{}
+
+	// first, go through and add all files/licenses from p1
+	for _, f := range p1.Files {
+		pair := LicensePair{First: f.LicenseConcluded, Second: ""}
+		pairs[f.FileName] = pair
+	}
+
+	// now, go through all files/licenses from p2. If already
+	// present, add as .second; if not, create new pair
+	for _, f := range p2.Files {
+		firstLic := ""
+		existingPair, ok := pairs[f.FileName]
+		if ok {
+			// already present; update it
+			firstLic = existingPair.First
+		}
+		// now, update what's there, either way
+		pair := LicensePair{First: firstLic, Second: f.LicenseConcluded}
+		pairs[f.FileName] = pair
+	}
+
+	return pairs, nil
+}
+
+// MakePairs2_2 essentially just consolidates all files and LicenseConcluded
+// strings into a single data structure.
+func MakePairs2_2(p1 *spdx.Package2_2, p2 *spdx.Package2_2) (map[string]LicensePair, error) {
 	pairs := map[string]LicensePair{}
 
 	// first, go through and add all files/licenses from p1