From b37a4cd18827d6a8dafe2729ba72a8e13e8fbb8c Mon Sep 17 00:00:00 2001
From: Shulhan <ms@kilabit.info>
Date: Wed, 14 Jan 2026 04:40:19 +0700
Subject: all: fix error when scanning and apply empty file

---
 file.go                              |  3 ++
 spdxconv_test.go                     | 32 +++++++++++++++
 testdata/Apply_fromReport/.gitignore |  5 +++
 testdata/Apply_fromReport_test.txt   | 76 ++++++++++++++++++++++++++++++++++++
 testdata/Apply_test.txt              |  6 +++
 5 files changed, 122 insertions(+)
 create mode 100644 testdata/Apply_fromReport/.gitignore
 create mode 100644 testdata/Apply_fromReport_test.txt

diff --git a/file.go b/file.go
index 11d2154..c98beb1 100644
--- a/file.go
+++ b/file.go
@@ -95,6 +95,9 @@ func (f *file) initLines(content []byte, maxLine int) (err error) {
 		if err != nil {
 			return err
 		}
+		if len(content) == 0 {
+			return nil
+		}
 	}
 
 	f.lines = bytes.Split(content, []byte{'\n'})
diff --git a/spdxconv_test.go b/spdxconv_test.go
index aa37cba..f473a2e 100644
--- a/spdxconv_test.go
+++ b/spdxconv_test.go
@@ -189,6 +189,38 @@ func TestApply(t *testing.T) {
 	}
 }
 
+func TestApply_fromReport(t *testing.T) {
+	// Populate the test files.
+
+	var testData *test.Data
+	var err error
+	testData, err = test.LoadData(`testdata/Apply_fromReport_test.txt`)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var tempDir = `testdata/Apply_fromReport/`
+	testData.ExtractInput(tempDir)
+	t.Chdir(tempDir)
+
+	err = Apply()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for input, _ := range testData.Input {
+		if input == ConfigFile || input == ReportFile {
+			continue
+		}
+
+		got, err := os.ReadFile(input)
+		if err != nil {
+			t.Fatal(err)
+		}
+		test.Assert(t, input+`: after`,
+			string(testData.Output[input]), string(got))
+	}
+}
+
 func TestNew(t *testing.T) {
 	type testCase struct {
 		exp      *SPDXConv
diff --git a/testdata/Apply_fromReport/.gitignore b/testdata/Apply_fromReport/.gitignore
new file mode 100644
index 0000000..234c892
--- /dev/null
+++ b/testdata/Apply_fromReport/.gitignore
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-FileCopyrightText: 2026 M. Shulhan <ms@kilabit.info>
+
+/*
+!/.gitignore
diff --git a/testdata/Apply_fromReport_test.txt b/testdata/Apply_fromReport_test.txt
new file mode 100644
index 0000000..33d4e85
--- /dev/null
+++ b/testdata/Apply_fromReport_test.txt
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-3.0-only
+// SPDX-FileCopyrightText: 2026 M. Shulhan <ms@kilabit.info>
+
+// REUSE-IgnoreStart
+
+>>> spdxconv.cfg
+# SPDX-License-Identifier: CC0-1.0
+# SPDX-FileCopyrightText: 2026 M. Shulhan <ms@kilabit.info>
+
+[default]
+license_identifier = GPL-3.0-only
+copyright_year = 2026
+file_copyright_text = M. Shulhan <ms@kilabit.info>
+
+[match-file-comment]
+pattern = "^.*\\.(adoc|asciidoc|c|cc|cpp|cs|dart|go|h|hh|hpp|java|js|jsx|jsonc|kt|kts|php|rs|sass|scss|swift|ts|tsx)$"
+prefix = "//"
+
+[match-file-comment]
+pattern = "^.*\\.(aff|bash|csh|dockerfile|env|gitignore|hcl|ipynb|make|pl|pm|py|ps1|rb|sh|tf|yaml|yml|zsh)$"
+prefix = "#"
+
+[match-file-comment]
+pattern = "^.*\\.(css)$"
+prefix = "/*"
+suffix = "*/"
+
+[match-file-comment]
+pattern = "^.*\\.(fxml|htm|html|html5|kml|markdown|md|xml)$"
+prefix = "<!--"
+suffix = "-->"
+
+[match-file-comment]
+pattern = "^.*\\.(lua|sql)$"
+prefix = "--"
+
+[match-file-comment]
+pattern = "^.*\\.(rst)$"
+prefix = ".."
+
+[match-file-comment]
+pattern = "^.*\\.(tex)$"
+prefix = "%"
+
+# File name that match with this pattern will have the ".license" file
+# created.
+[match-file-comment]
+pattern = "^.*\\.(apk|app|bz2|csv|doc|docx|exe|gif|gz|jpeg|jpg|json|pdf|png|ppt|pptx|svg|svgz|tar|tgz|xls|xlsx|zip)$"
+
+[match-license]
+pattern = "^(//+|#+|/\\*+|<!--+|--+)?\\s*(.*)governed by a BSD-style(.*)$"
+license_identifier = BSD-3-Clause
+delete_line_before = "^(//+|#+|/\\*+|<!--+|--+)$"
+delete_line_after = "^(//+|#+|/\\*+|<!--+|--+)?\\s*license that can(.*)$"
+delete_line_after = "^(//+|#+|\\*+/|--+>|--+)$"
+
+[match-copyright]
+pattern = "^(//+|#+|/\\*+|<!--+|--+)?\\s*Copyright\\s+(?<year>\\d{4}),?\\s+(?<author>.*)\\s+<(?<contact>.*)>.*$"
+delete_line_before = "^(//+|#+|/\\*+|<!--+|--+)$"
+delete_line_after = "^(//+|#+|\\*+/|--+>|--+)$"
+
+>>> spdxconv.report
+
+//spdxconv:regular
+empty.html,default,0,2026,default,0,<!-- ," -->"
+//spdxconv:binary
+//spdxconv:unknown
+
+>>> empty.html
+
+<<< empty.html
+<!-- SPDX-License-Identifier: GPL-3.0-only -->
+<!-- SPDX-FileCopyrightText: 2026 M. Shulhan <ms@kilabit.info> -->
+
+<<< END
+// REUSE-IgnoreEnd
diff --git a/testdata/Apply_test.txt b/testdata/Apply_test.txt
index a8c3e6d..13ee6be 100644
--- a/testdata/Apply_test.txt
+++ b/testdata/Apply_test.txt
@@ -59,6 +59,12 @@ pattern = "^(//+|#+|/\\*+|<!--+|--+)?\\s*Copyright\\s+(?<year>\\d{4}),?\\s+(?<au
 delete_line_before = "^(//+|#+|/\\*+|<!--+|--+)$"
 delete_line_after = "^(//+|#+|\\*+/|--+>|--+)$"
 
+>>> empty.html
+
+<<< empty.html
+<!-- SPDX-License-Identifier: GPL-3.0-only -->
+<!-- SPDX-FileCopyrightText: 2026 M. Shulhan <ms@kilabit.info> -->
+
 >>> without_spdx_license_id.go
 1
 2
-- 
cgit v1.3