terminal+make: encode and print LiT version

Fixes #328 by encoding the LiT version and also printing it on startup.

Makefile

@@ -60,6 +60,7 @@ make_ldflags = $(2) -X $(LND_PKG)/build.Commit=lightning-terminal-$(COMMIT) \
 	-X $(LND_PKG)/build.GoVersion=$(GOVERSION) \
 	-X $(LND_PKG)/build.RawTags=$(shell echo $(1) | sed -e 's/ /,/g') \
 	-X $(PKG).appFilesPrefix=$(PUBLIC_URL) \
+	-X $(PKG).Commit=$(COMMIT) \
 	-X $(LOOP_PKG).Commit=$(LOOP_COMMIT) \
 	-X $(POOL_PKG).Commit=$(POOL_COMMIT)
 

README.md

@@ -70,6 +70,7 @@ Lightning Terminal is backwards compatible with `lnd` back to version v0.13.3-be
 
 | LiT              | LND          |
 |------------------| ------------ |
+| **v0.6.4-alpha** | v0.13.3-beta |
 | **v0.6.3-alpha** | v0.13.3-beta |
 | **v0.6.2-alpha** | v0.13.3-beta |
 | **v0.6.1-alpha** | v0.13.3-beta |
@@ -113,6 +114,7 @@ The following table shows the supported combinations:
 
 | LiT              | LND          | Loop        | Faraday      | Pool         |
 |------------------|--------------| ----------- | ------------ |--------------|
+| **v0.6.4-alpha** | v0.14.2-beta | v0.15.1-beta | v0.2.7-alpha | v0.5.4-alpha |
 | **v0.6.3-alpha** | v0.14.2-beta | v0.15.1-beta | v0.2.7-alpha | v0.5.4-alpha |
 | **v0.6.2-alpha** | v0.14.1-beta | v0.15.1-beta | v0.2.7-alpha | v0.5.4-alpha |
 | **v0.6.1-alpha** | v0.14.1-beta | v0.15.1-beta | v0.2.7-alpha | v0.5.2-alpha |

terminal.go

@@ -187,6 +187,9 @@ func (g *LightningTerminal) Run() error {
 	g.cfg = cfg
 	g.defaultImplCfg = g.cfg.Lnd.ImplementationConfig(shutdownInterceptor)
 
+	// Show version at startup.
+	log.Infof("LiT version: %s", Version())
+
 	// Create the instances of our subservers now so we can hook them up to
 	// lnd once it's fully started.
 	bufRpcListener := bufconn.Listen(100)
@@ -1349,14 +1352,15 @@ func (g *LightningTerminal) showStartupInfo() error {
 		"----------------------------------------------------------\n" +
 		" Lightning Terminal (LiT) by Lightning Labs               \n" +
 		"                                                          \n" +
-		" Operating mode      %s                                   \n" +
-		" Node status         %s                                   \n" +
-		" Alias               %s                                   \n" +
-		" Version             %s                                   \n" +
-		" Web interface       %s (open %s in your browser)         \n" +
+		" LND Operating mode      %s                               \n" +
+		" LND Node status         %s                               \n" +
+		" LND Alias               %s                               \n" +
+		" LND Version             %s                               \n" +
+		" LiT Version             %s                               \n" +
+		" Web interface           %s (open %s in your browser)     \n" +
 		"----------------------------------------------------------\n"
 	fmt.Printf(str, info.mode, info.status, info.alias, info.version,
-		listenAddr, info.webURI)
+		Version(), listenAddr, info.webURI)
 
 	return nil
 }

version.go

@@ -0,0 +1,66 @@
+package terminal
+
+// Copyright (c) 2013-2017 The btcsuite developers
+// Copyright (c) 2015-2016 The Decred developers
+// Heavily inspired by https://github.com/btcsuite/btcd/blob/master/version.go
+// Copyright (C) 2015-2022 The Lightning Network Developers
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+)
+
+// Commit stores the current commit hash of this build, this should be set
+// using the -ldflags during compilation.
+var Commit string
+
+// semanticAlphabet
+const semanticAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-"
+
+// These constants define the application version and follow the semantic
+// versioning 2.0.0 spec (http://semver.org/).
+const (
+	appMajor uint = 0
+	appMinor uint = 6
+	appPatch uint = 4
+
+	// appPreRelease MUST only contain characters from semanticAlphabet per
+	// the semantic versioning spec.
+	appPreRelease = "alpha"
+)
+
+// Version returns the application version as a properly formed string per the
+// semantic versioning 2.0.0 spec (http://semver.org/).
+func Version() string {
+	// Start with the major, minor, and patch versions.
+	version := fmt.Sprintf("%d.%d.%d", appMajor, appMinor, appPatch)
+
+	// Append pre-release version if there is one.  The hyphen called for
+	// by the semantic versioning spec is automatically appended and should
+	// not be contained in the pre-release string.  The pre-release version
+	// is not appended if it contains invalid characters.
+	preRelease := normalizeVerString(appPreRelease)
+	if preRelease != "" {
+		version = fmt.Sprintf("%s-%s", version, preRelease)
+	}
+
+	// Append commit hash of current build to version.
+	version = fmt.Sprintf("%s commit=%s", version, Commit)
+
+	return version
+}
+
+// normalizeVerString returns the passed string stripped of all characters
+// which are not valid according to the semantic versioning guidelines for
+// pre-release version and build metadata strings.  In particular they MUST
+// only contain characters in semanticAlphabet.
+func normalizeVerString(str string) string {
+	var result bytes.Buffer
+	for _, r := range str {
+		if strings.ContainsRune(semanticAlphabet, r) {
+			result.WriteRune(r)
+		}
+	}
+	return result.String()
+}