Automatically fill version info in index.html

Makefile

@@ -3,18 +3,23 @@
 ## Do not use it if that isn't your goal!
 ##
 
+# # # Configuration Variables # # #
+#
 # Patch these to select a different build profile or target
 # The target shouldn't change any time soon. WASM64, I guess. Other targets
 # aren't aimed at the web, so you shouldn't be using this makefile.
 CARGO_TARGET := wasm32-unknown-unknown
 CARGO_PROFILE := tiny
 
+# # # Automatic Variables # # #
 SRC_DIR = ./src
 SRCS := $(wildcard $(SRC_DIR)/**)
 
 ASSET_SOURCE := $(wildcard assets/**)
 ASSETS := $(patsubst assets/%.ogg, out/assets/%.ogg, $(ASSET_SOURCE))
 
+CRATE_VERSION != sed -nre 's/^version = "(.*)"/\1/p' Cargo.toml
+
 .PHONY: clean full-clean tarball tarball-standalone web web-standalone
 
 # "Standalone" version. It includes an index.html to serve as-is
@@ -56,6 +61,7 @@ out/asteroids.js out/asteroids_bg.wasm.gz &: target/$(CARGO_TARGET)/$(CARGO_PROF
 out/index.html: www/index.html
 	cp -a $< $@
 	rm -f out/asteroids.html
+	sed -i -e "s/#CRATE_VERSION_PLACEHOLDER#/$(CRATE_VERSION)/" $@
 
 # Like `out/index.html`, but renames the page for use in a larger site.
 out/asteroids.html: www/index.html

www/index.html

@@ -118,8 +118,7 @@
         </tr>
         <tr>
           <td>Program Version</td>
-          <!-- This version text is completely unchecked. I'll need to do something about that. -->
-          <td><code>v0.6.1</code></td>
+          <td><code>#CRATE_VERSION_PLACEHOLDER#</code></td>
         </tr>
       </table>
     </article>