WebAssembly: read cwd from environment vars

Author: yurydelendik

src/file.cpp

@@ -18,6 +18,7 @@
 #include <cctype>
 #include <vector>
 #include <algorithm>
+#include <stdlib.h>
 #include <sys/stat.h>
 #include "file.hpp"
 #include "context.hpp"
@@ -49,6 +50,15 @@ inline static std::string wstring_to_string(const std::wstring &wstr)
 # endif
 #endif
 
+#ifdef _WASM
+inline static std::string get_cwd_from_env()
+{
+  char* value = getenv("PWD");
+  if (!value) return "(unreachable)";
+  return value;
+}
+#endif
+
 namespace Sass {
   namespace File {
 
@@ -57,10 +67,10 @@ namespace Sass {
     // always with trailing slash
     std::string get_cwd()
     {
-      const size_t wd_len = 4096;
       #ifdef _WASM
-        std::string cwd = "/";
+        std::string cwd = get_cwd_from_env();
       #else
+      const size_t wd_len = 4096;
       #ifndef _WIN32
         char wd[wd_len];
         char* pwd = getcwd(wd, wd_len);

wasm/cli.js

@@ -15,6 +15,7 @@ async function init() {
     {"wasi_unstable": wrapper.exports}
   );
   host.args = [wasmPath, ...process.argv.slice(2)];
+  host.env = [`PWD=${process.cwd()}`];
   host.memory = sassc.exports.memory;
   return sassc.exports;
 }

wasm/package.json.in

@@ -1,6 +1,6 @@
 {
   "name": "sassc-wasi",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "",
   "main": "index.js",
   "scripts": {