Logging improvements (#195)

- Fix (and test) filtering of lines
- Filter out shadowsocks cannot resolve error
- Change tinyproxy color
- Deduct logging level according to message content

internal/logging/splash.go

@@ -0,0 +1,59 @@
+package logging
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/kyokomi/emoji"
+	"github.com/qdm12/private-internet-access-docker/internal/constants"
+)
+
+// Splash returns the welcome spash message
+func Splash(version, vcsRef, buildDate string) string {
+	lines := title()
+	lines = append(lines, "")
+	lines = append(lines, fmt.Sprintf("Running version %s built on %s (commit %s)", version, buildDate, vcsRef))
+	lines = append(lines, "")
+	lines = append(lines, announcement()...)
+	lines = append(lines, "")
+	lines = append(lines, links()...)
+	return strings.Join(lines, "\n")
+}
+
+func title() []string {
+	return []string{
+		"=========================================",
+		"================ Gluetun ================",
+		"=========================================",
+		"==== A mix of OpenVPN, DNS over TLS, ====",
+		"======= Shadowsocks and Tinyproxy =======",
+		"========= all glued up with Go ==========",
+		"=========================================",
+		"=========== For tunneling to ============",
+		"======== your favorite VPN server =======",
+		"=========================================",
+		"=== Made with " + emoji.Sprint(":heart:") + " by github.com/qdm12 ====",
+		"=========================================",
+	}
+}
+
+func announcement() []string {
+	if len(constants.Announcement) == 0 {
+		return nil
+	}
+	expirationDate, _ := time.Parse("2006-01-02", constants.AnnouncementExpiration) // error covered by a unit test
+	if time.Now().After(expirationDate) {
+		return nil
+	}
+	return []string{emoji.Sprint(":mega: ") + constants.Announcement}
+}
+
+func links() []string {
+	return []string{
+		emoji.Sprint(":wrench: ") + "Need help? " + constants.IssueLink,
+		emoji.Sprint(":computer: ") + "Email? quentin.mcgaw@gmail.com",
+		emoji.Sprint(":coffee: ") + "Slack? Join from the Slack button on Github",
+		emoji.Sprint(":money_with_wings: ") + "Help me? https://github.com/sponsors/qdm12",
+	}
+}