footer: show git revision

templates/footer.tmpl

@@ -1,6 +1,8 @@
 {{ define "footer" }}
 <footer class="bg-gray-700 mt-8 p-4 text-center mt-auto">
-  <p>Built by <a href="https://raghavsood.com" target="_blank" class="hover:underline hover:text-slate-200 hover:decoration-dotted text-sky-400/70">Raghav Sood</a>.</p><p>burned.money is licensed under <span class="inline-flex"><a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="license noopener noreferrer" class="hover:underline hover:text-slate-200 hover:decoration-dotted text-sky-400/70">CC BY 4.0</a>.</span></p>
+  <p>Built by <a href="https://raghavsood.com" target="_blank" class="hover:underline hover:text-slate-200 hover:decoration-dotted text-sky-400/70">Raghav Sood</a>.</p>
+  <p>burned.money is licensed under <span class="inline-flex"><a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="license noopener noreferrer" class="hover:underline hover:text-slate-200 hover:decoration-dotted text-sky-400/70">CC BY 4.0</a>.</span></p>
+  <p>Running <a href="https://github.com/RaghavSood/btcsupply/tree/{{ GitCommit }}" target="_blank" class="hover:underline hover:text-slate-200 hover:decoration-dotted text-sky-400/70" target="_blank">{{ slice GitCommit 0 7 }}</a>.</p>
 </footer>
 {{ end }}
 

templates/template.go

@@ -27,6 +27,7 @@ func New() *Template {
 		"IsScriptInNotes":     util.IsScriptInNotes,
 		"ValueToBigInt":       types.ValueToBigInt,
 		"TimeDisclaimer":      util.TimeDisclaimer,
+		"GitCommit":           util.GitCommit,
 	}
 
 	templates := template.Must(template.New("").Funcs(funcMap).ParseFS(Templates, "footer.tmpl", "header.tmpl", "base.tmpl", "note.tmpl"))

util/util.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"html/template"
+	"runtime/debug"
 	"time"
 
 	"github.com/RaghavSood/btcsupply/notes"
@@ -74,3 +75,17 @@ func TimeDisclaimer(target time.Time) string {
 	}
 	return ""
 }
+
+func GitCommit() string {
+	buildInfo, ok := debug.ReadBuildInfo()
+	if ok {
+		settings := buildInfo.Settings
+		for _, s := range settings {
+			if s.Key == "vcs.revision" {
+				return s.Value
+			}
+		}
+	}
+
+	return "unknown"
+}