estimate: print Debian package's name & URL for approximate matches

This allows to get an easy access to the tracker page of the corresponding
packages in case of approximate matches, which is especially useful when
the major version present in Debian cannot be determined from the value of
Go-Import-Path.

Author: n-peugnet

estimate.go

@@ -95,15 +95,22 @@ func otherVersions(mod string) (mods []string) {
 }
 
 // findOtherVersion search in m for potential other versions of the given
-// module and returns the number of the major version found, 0 if not.
-func findOtherVersion(m map[string]string, mod string) int {
+// module and returns the number of the major version found, 0 if not,
+// along with the corresponding package name.
+func findOtherVersion(m map[string]string, mod string) (int, string) {
 	versions := otherVersions(mod)
 	for i, version := range versions {
-		if _, ok := m[version]; ok {
-			return len(versions) - i
+		if pkg, ok := m[version]; ok {
+			return len(versions) - i, pkg
 		}
 	}
-	return 0
+	return 0, ""
+}
+
+// trackerLink generates an OSC 8 hyperlink to the tracker for the given Debian
+// package name.
+func trackerLink(pkg string) string {
+	return fmt.Sprintf("\033]8;;https://tracker.debian.org/pkg/%[1]s\033\\%[1]s\033]8;;\033\\", pkg)
 }
 
 func estimate(importpath, revision string) error {
@@ -238,24 +245,24 @@ func estimate(importpath, revision string) error {
 				repoRoot = rr.Root
 			}
 			// Check for potential other major versions already in Debian.
-			v := findOtherVersion(golangBinaries, mod)
+			v, pkg := findOtherVersion(golangBinaries, mod)
 			if v != 0 {
 				// Log info to indicate that it is an approximate match
 				// but consider that it is packaged and skip the children.
 				if v == 1 {
-					log.Printf("%s has no version string in Debian", mod)
+					log.Printf("%s has no version string in Debian (%s)", mod, trackerLink(pkg))
 				} else {
-					log.Printf("%s is v%d in Debian", mod, v)
+					log.Printf("%s is v%d in Debian (%s)", mod, v, trackerLink(pkg))
 				}
 				return
 			}
 			// When multiple modules are developped in the same repo,
 			// the repo root is often used as the import path metadata
 			// in Debian, so we do a last try with that.
-			if _, ok := golangBinaries[repoRoot]; ok {
+			if pkg, ok := golangBinaries[repoRoot]; ok {
 				// Log info to indicate that it is an approximate match
 				// but consider that it is packaged and skip the children.
-				log.Printf("%s is packaged as %s in Debian", mod, repoRoot)
+				log.Printf("%s is packaged as %s in Debian (%s)", mod, repoRoot, trackerLink(pkg))
 				return
 			}
 			// Ignore modules from the blocklist.