In-code server revision info (#14840)

* In-code server revision info

* Moxian tweaks

code/datums/revision.dm

@@ -0,0 +1,56 @@
+GLOBAL_DATUM_INIT(revision_info, /datum/code_revision, new)
+GLOBAL_PROTECT(revision_info) // Dont mess with this
+
+/**
+  * Code Revision Datum
+  *
+  * Allows the server code to be aware of the Git environment it is running in, and lets commit hash be viewed
+  */
+/datum/code_revision
+	/// Current commit hash the server is running
+	var/commit_hash
+	/// Date that this commit was made
+	var/commit_date
+
+/datum/code_revision/New()
+	commit_hash = rustg_git_revparse("HEAD")
+	if(commit_hash)
+		commit_date = rustg_git_commit_date(commit_hash)
+
+/**
+  * Code Revision Logging Helper
+  *
+  * Small proc to simplify logging all this stuff
+  */
+/datum/code_revision/proc/log_info()
+	// Put revision info in the world log
+	var/logmsg
+	if(commit_hash && commit_date)
+		logmsg = "Running ParaCode commit: [commit_hash] (Date: [commit_date])"
+	else
+		logmsg = "Unable to determine revision info! Code may not be running in a git repository."
+
+	// Log it in all these
+	log_world(logmsg)
+	log_runtime_txt(logmsg)
+	log_runtime_summary(logmsg)
+
+/client/verb/get_revision_info()
+	set name = "Get Revision Info"
+	set category = "OOC"
+	set desc = "Retrieve technical information about the server"
+
+	var/list/msg = list()
+	msg += "<span class='notice'><b>Server Revision Info</b></span>"
+	// Commit info first
+	if(GLOB.revision_info.commit_hash && GLOB.revision_info.commit_date)
+		msg += "<b>Server Commit:</b> <a href='[config.githuburl]/commit/[GLOB.revision_info.commit_hash]'>[GLOB.revision_info.commit_hash]</a> (Date: [GLOB.revision_info.commit_date])"
+	else
+		msg += "<b>Server Commit:</b> <i>Unable to determine</i>"
+
+	// Show server BYOND version
+	msg += "<b>Server BYOND Version:</b> [world.byond_version].[world.byond_build]"
+	// And the clients for good measure
+	msg += "<b>Client (your) BYOND Version:</b> [byond_version].[byond_build]"
+
+	to_chat(usr, msg.Join("<br>"))