all: add configuration for setting default copyright year

The `copyright_year` set the default year to be used in
`SPDX-FileCopyrightText`.
The year can be a single year (for example "2026"), range of year (for
example, "2000-2026"), or list of year with comma separated (for example,
"2000,2001,2026"); as long as there is no space in between.

1 files changed, 3 insertions, 2 deletions

diff --git a/file.go b/file.go
index 4e8d565..7849d9e 100644
--- a/file.go
+++ b/file.go
@@ -240,8 +240,9 @@ func (f *file) apply(conv *SPDXConv) (err error) {
 	f.topLines = slices.Insert(f.topLines, f.idxLicenseID, rawline)
 
 	if f.copyrightYear == valUnknown {
-		f.copyrightYear = ``
-	} else {
+		f.copyrightYear = conv.cfg.CopyrightYear
+	}
+	if f.copyrightYear != `` {
 		f.copyrightYear += ` `
 	}
 	// REUSE-IgnoreStart