From aaa00d97396dac9eee9dacddb2a91ab610c576c5 Mon Sep 17 00:00:00 2001
From: Hiroaki Yutani <yutani.ini@gmail.com>
Date: Mon, 5 Feb 2024 23:45:15 +0900
Subject: [PATCH] Support WebR (#57)

---
 .github/workflows/build-wasm.yml | 20 ++++++++++++++++++++
 configure                        | 10 ++++++++++
 configure.win                    |  4 ++++
 src/Makevars.in                  | 16 ++++++++++++----
 src/Makevars.win.in              |  5 ++---
 5 files changed, 48 insertions(+), 7 deletions(-)
 create mode 100644 .github/workflows/build-wasm.yml

diff --git a/.github/workflows/build-wasm.yml b/.github/workflows/build-wasm.yml
new file mode 100644
index 0000000..a9c2d74
--- /dev/null
+++ b/.github/workflows/build-wasm.yml
@@ -0,0 +1,20 @@
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+    branches: [main, master]
+
+name: Build WASM
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout calling repository
+        uses: actions/checkout@v4
+
+      - name: Build wasm packages
+        uses: yutannihilation/r-wasm-actions/build-rwasm@main
+        with:
+          packages: |
+            local::.
diff --git a/configure b/configure
index 3586297..054ae9f 100755
--- a/configure
+++ b/configure
@@ -27,13 +27,23 @@ fi
 if [ "${NOT_CRAN}" != "true" ]; then
   BEFORE_CARGO_BUILD="${BEFORE_CARGO_BUILD}"' export CARGO_HOME="$(PWD)/.cargo" \&\&'
   AFTER_CARGO_BUILD="${AFTER_CARGO_BUILD}"'rm -Rf $(PWD)/.cargo $(LIBDIR)/build'
+  VENDORING="yes"
+  OFFLINE_OPTION="--offline"
 else
   echo "*** Detected NOT_CRAN=true, do not override CARGO_HOME"
 fi
 
+# Handle webR
+if [ "$(uname)" = "Emscripten" ]; then
+  WEBR="yes"
+fi
+
 sed \
   -e "s|@BEFORE_CARGO_BUILD@|${BEFORE_CARGO_BUILD}|" \
   -e "s|@AFTER_CARGO_BUILD@|${AFTER_CARGO_BUILD}|" \
+  -e "s|@VENDORING@|${VENDORING}|" \
+  -e "s|@OFFLINE_OPTION@|${OFFLINE_OPTION}|" \
+  -e "s|@WEBR@|${WEBR}|" \
   src/Makevars.in > src/Makevars
 
 # Uncomment this to debug
diff --git a/configure.win b/configure.win
index afc4456..e37306d 100755
--- a/configure.win
+++ b/configure.win
@@ -21,6 +21,8 @@ BEFORE_CARGO_BUILD="${BEFORE_CARGO_BUILD}"' export LIBRARY_PATH="$${LIBRARY_PATH
 if [ "${NOT_CRAN}" != "true" ]; then
   BEFORE_CARGO_BUILD="${BEFORE_CARGO_BUILD}"' export CARGO_HOME="$(PWD)/.cargo" \&\&'
   AFTER_CARGO_BUILD="${AFTER_CARGO_BUILD}"'rm -Rf $(PWD)/.cargo $(LIBDIR)/build'
+  VENDORING="yes"
+  OFFLINE_OPTION="--offline"
 else
   echo "*** Detected NOT_CRAN=true, do not override CARGO_HOME"
 fi
@@ -28,6 +30,8 @@ fi
 sed \
   -e "s|@BEFORE_CARGO_BUILD@|${BEFORE_CARGO_BUILD}|" \
   -e "s|@AFTER_CARGO_BUILD@|${AFTER_CARGO_BUILD}|" \
+  -e "s|@VENDORING@|${VENDORING}|" \
+  -e "s|@OFFLINE_OPTION@|${OFFLINE_OPTION}|" \
   src/Makevars.win.in > src/Makevars.win
 
 # Uncomment this to debug
diff --git a/src/Makevars.in b/src/Makevars.in
index f281805..8dd0db8 100644
--- a/src/Makevars.in
+++ b/src/Makevars.in
@@ -1,6 +1,7 @@
-# TODO
-VENDORING = yes
-OFFLINE_OPTION = --offline
+WEBR = @WEBR@
+
+VENDORING = @VENDORING@
+OFFLINE_OPTION = @OFFLINE_OPTION@
 
 LIBDIR = ./rust/target/release
 PKG_LIBS = -L$(LIBDIR) -lstring2path
@@ -19,7 +20,14 @@ $(STATLIB):
 	    cp ./cargo_vendor_config.toml ./rust/.cargo/config.toml; \
 	fi
 
-	@BEFORE_CARGO_BUILD@ cd ./rust && cargo build --jobs 1 --lib --release $(OFFLINE_OPTION)
+	if [ "$(TARGET)" != "wasm32-unknown-emscripten" ]; then \
+	  @BEFORE_CARGO_BUILD@ cd ./rust && cargo build --jobs 1 --lib --release $(OFFLINE_OPTION); \
+	else \
+	  export CC="$(CC)" && \
+	  export CFLAGS="$(CFLAGS)" && \
+	  export CARGO_PROFILE_RELEASE_PANIC="abort" && \
+	  @BEFORE_CARGO_BUILD@ cd ./rust && cargo +nightly build --lib --release --target wasm32-unknown-emscripten -Zbuild-std=panic_abort,std $(OFFLINE_OPTION); \
+	fi
 	@AFTER_CARGO_BUILD@
 
 C_clean:
diff --git a/src/Makevars.win.in b/src/Makevars.win.in
index 450c706..1de05ba 100644
--- a/src/Makevars.win.in
+++ b/src/Makevars.win.in
@@ -4,9 +4,8 @@ TARGET = x86_64-pc-windows-gnu
 # need to overwrite it via configuration.
 CARGO_LINKER = x86_64-w64-mingw32.static.posix-gcc.exe
 
-# TODO
-VENDORING = yes
-OFFLINE_OPTION = --offline
+VENDORING = @VENDORING@
+OFFLINE_OPTION = @OFFLINE_OPTION@
 
 LIBDIR = ./rust/target/$(TARGET)/release
 PKG_LIBS = -L$(LIBDIR) -lstring2path -lws2_32 -ladvapi32 -luserenv -lbcrypt -lntdll