From 2ccf308e1bb0e98946dd336ea77bc7144da1b289 Mon Sep 17 00:00:00 2001
From: "Stanislav N. aka pztrn" <pztrn@pztrn.name>
Date: Sat, 8 Feb 2020 12:51:42 +0500
Subject: [PATCH] Get copyrights from license file.

---
 outputters/csv/csv.go |  3 ++-
 projecter/project.go  | 32 +++++++++++++++++++++++++++++++-
 structs/license.go    |  2 +-
 3 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/outputters/csv/csv.go b/outputters/csv/csv.go
index e974a62..5d1e020 100644
--- a/outputters/csv/csv.go
+++ b/outputters/csv/csv.go
@@ -6,6 +6,7 @@ import (
 	"log"
 	"os"
 	"strconv"
+	"strings"
 
 	// local
 	"go.dev.pztrn.name/glp/structs"
@@ -40,7 +41,7 @@ func (o *outputter) Write(deps []*structs.Dependency, outFile string) {
 
 	// Write dependencies information.
 	for _, dep := range deps {
-		_ = writer.Write([]string{dep.Name, dep.Version, dep.License.Name, dep.VCS.VCSPath, dep.License.URL, dep.Parent, dep.License.Copyrights})
+		_ = writer.Write([]string{dep.Name, dep.Version, dep.License.Name, dep.VCS.VCSPath, dep.License.URL, dep.Parent, strings.Join(dep.License.Copyrights, ",")})
 	}
 
 	writer.Flush()
diff --git a/projecter/project.go b/projecter/project.go
index 8b15322..7e22c38 100644
--- a/projecter/project.go
+++ b/projecter/project.go
@@ -2,6 +2,7 @@ package projecter
 
 import (
 	// stdlib
+	"bufio"
 	"log"
 	"os"
 	"path/filepath"
@@ -63,6 +64,31 @@ func (p *Project) initialize(packagePath string) {
 	}
 }
 
+// Parses license file for copyrights.
+func (p *Project) parseLicenseForCopyrights(licencePath string) []string {
+	f, err := os.Open(licencePath)
+	if err != nil {
+		log.Println("Failed to open license file for reading:", err.Error())
+		return nil
+	}
+
+	var copyrights []string
+
+	// Read file data line by line.
+	gosum := bufio.NewScanner(f)
+	gosum.Split(bufio.ScanLines)
+
+	for gosum.Scan() {
+		line := gosum.Text()
+
+		if strings.HasPrefix(strings.ToLower(line), "copyright ") && !strings.Contains(strings.ToLower(line), "notice") {
+			copyrights = append(copyrights, line)
+		}
+	}
+
+	return copyrights
+}
+
 // Starts project parsing.
 func (p *Project) process() {
 	// We should determine project type.
@@ -137,8 +163,12 @@ func (p *Project) process() {
 
 		dep.License.Name = licenseName
 
-		// Generate license path.
+		// Generate license URL.
 		urlFormatter := strings.NewReplacer("{dir}", "", "{/dir}", "", "{file}", licenseFile, "{/file}", licenseFile, "#L{line}", "")
 		dep.License.URL = urlFormatter.Replace(dep.VCS.SourceURLFileTemplate)
+
+		// As we should have dependency locally available we should try
+		// to parse license file to get copyrights.
+		dep.License.Copyrights = p.parseLicenseForCopyrights(filepath.Join(dep.LocalPath, licenseFile))
 	}
 }
diff --git a/structs/license.go b/structs/license.go
index 1f772d0..4b9c27d 100644
--- a/structs/license.go
+++ b/structs/license.go
@@ -1,7 +1,7 @@
 package structs
 
 type License struct {
-	Copyrights string
+	Copyrights []string
 	Name       string
 	URL        string
 }