Add wasm target

.github/workflows/pages.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Setup emsdk
         uses: mymindstorm/setup-emsdk@v14
       - name: Build Space Travel
-        run: emcc st.c -s USE_SDL=2 -o html/st.js
+        run: make wasm
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3
         with:

.gitignore

@@ -2,4 +2,6 @@
 *.obj
 *.dll
 *.exe
+*.wasm
 /st
+/html/st.js

Makefile

@@ -1,5 +1,6 @@
 INSTALL = install
 MKDIR = mkdir -p
+EMCC = emcc
 
 prefix = /usr/local
 bindir = $(prefix)/bin
@@ -16,9 +17,17 @@ prefix=. # \
 !endif
 
 LDLIBS = -lm -lSDL2
+
 all: st$(EXEEXT)
+
+wasm: html/st.js
+
+html/st.js: st.c
+	$(EMCC) -s USE_SDL=2 -o $@ st.c
+
 clean:
-	$(RM) st$(EXEEXT)
+	$(RM) st$(EXEEXT) html/st.js html/st.wasm
+
 install: st$(EXEEXT) $(DESTDIR)$(bindir)
 	$(INSTALL) st$(EXEEXT) "$(DESTDIR)$(bindir)"
 

README.md

@@ -3,7 +3,8 @@
 This is a C port of Ken Thompson's
 [Space Travel](https://en.wikipedia.org/wiki/Space_Travel_\(video_game\)),
 ported from PDP-7 assembly. The original source files are in `src/cmd/st*.s`
-in the [pdp7-unix](https://github.com/DoctorWkt/pdp7-unix) repository.
+in the [pdp7-unix](https://github.com/DoctorWkt/pdp7-unix) repository. The game
+is available to [play online](https://akr.am/st) via WebAssembly.
 
 ## Install
 
@@ -13,6 +14,10 @@ Run `make` to build `st`.
 
 Run `make install` to install to `/usr/local/bin`.
 
+Run `make wasm` (requires [Emscripten](https://emscripten.org)) to build a
+WebAssembly version of the game. To play it, launch a web server via
+`python3 -m http.server -d html` and go to http://localhost:8000.
+
 ## Controls
 
 | Key | Action       |