From 976889e9c4dcbc141aa7b60c6337f4926051b325 Mon Sep 17 00:00:00 2001
From: Mohamed Akram <mohd.akram@outlook.com>
Date: Wed, 18 Sep 2024 08:03:47 +0400
Subject: [PATCH] Add wasm target

---
 .github/workflows/pages.yml |  2 +-
 .gitignore                  |  2 ++
 Makefile                    | 11 ++++++++++-
 README.md                   |  7 ++++++-
 4 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/pages.yml b/.github/workflows/pages.yml
index 43aeb9f..8000ef6 100644
--- a/.github/workflows/pages.yml
+++ b/.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:
diff --git a/.gitignore b/.gitignore
index 6de6262..35b9086 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,6 @@
 *.obj
 *.dll
 *.exe
+*.wasm
 /st
+/html/st.js
diff --git a/Makefile b/Makefile
index 7aa7481..b070978 100644
--- a/Makefile
+++ b/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/*.wasm
+
 install: st$(EXEEXT) $(DESTDIR)$(bindir)
 	$(INSTALL) st$(EXEEXT) "$(DESTDIR)$(bindir)"
 
diff --git a/README.md b/README.md
index 6fecd67..ef1d3e4 100644
--- a/README.md
+++ b/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       |